Article
Chemistry, Physical
Tianchi Chen, Fangchang Lin, Hongming Wu, Dengfeng Zhou, Jiling Song, Jianbing Guo
Summary: The LiNi0.5-xZnxMn1.48Y0.02O4 (x = 0.01, 0.03, 0.05) series were prepared via a sol-gel method to improve the electrochemical performance of the LiNi0.5Mn1.5O4 (LNMO) sample. The Zn-Y co-doping led to increased lattice parameters, morphological evolution, decreased Mn3+ content, and better electrochemical properties compared to the pristine LNMO. Among the samples, LiNi0.47Zn0.03Mn1.48Y0.02O4 (0.03ZnY) showed optimal electrochemical properties at room temperature and elevated temperature, with a higher discharge capacity and capacity retention than the pristine sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Manufacturing
Fanfei Zeng, Yu Zhang, Zhongcai Shao
Summary: The Mo-doped LiNi0.5Mn1.5O4 material was synthesized successfully using the freezing precipitation method, and the effects of different doping amounts on the properties of LiNi0.5Mn1.5O4 were studied. It was found that the material doped with 1% Mo showed superior performance, exhibiting the highest capacity and capacity retention rate.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Article
Electrochemistry
Krystian Chudzik, Michal Swietoslawski, Monika Bakierska, Marcelina Kubicka, Piotr Natkanski, Jakub Kawalko, Marcin Molenda
Summary: K and S doped LiMn2O4 cathode material was synthesized through sol-gel route, with different dopant combinations studied for their effects on performance, leading to the establishment of optimal composition for high-power application.
ELECTROCHIMICA ACTA
(2021)
Article
Physics, Condensed Matter
Z. Radzi, Vengadaesvaran Balakrishnan, A. K. Pandey, M. Z. Kufian, N. A. Rahim, S. R. S. Raihan, S. Ramesh
Summary: Spinel LiNi(0.5)Mr(0.5)O(4) (LNMO) cathode is effectively synthesized by one-pot hydrothermal method, and the hybrid morphological of LNMO is revealed by SEM. Grain and grain boundary effects are observed and the existence of non-homogenous layers is confirmed by the Maxwell-Wagner model. In addition, Li+ ions are identified as the dominant charge carriers.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
Xingfu Zi, Xin Huang, Jiling Song, Hongming Wu, Jianbing Guo
Summary: The application of LiNi0.49Mn1.49-xSrxY0.02O4 (x = 0.02, 0.04, 0.06) synthesized by sol-gel method in high energy density lithium-ion batteries was studied. The doping of Sr and Y improved the microscopic morphology and electrochemical performance of the LNMO material, with the LiNi0.49Mn1.45Sr0.04Y0.02O4 LNMO sample showing the optimal electrochemical performance.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Pirmin Stueble, Marcus Mueller, Thomas Bergfeldt, Joachim R. Binder, Andreas Hofmann
Summary: This study focuses on the improved cycling stability of Li-ion batteries using Fe-Ti-doped LiNi0.5Mn1.5O4 (LNMO) high-voltage cathode active material and graphite anodes. By adding 1 wt% Li3PO4 as a cathode additive, the capacity retention for 1000 charge-discharge cycles reaches over 90% and the remaining capacities are 109 mAh g(-1) at an areal capacity of 2.3 mAh cm(-2) (potential range: 3.5-4.9 V). The improved cycling stability is attributed to the low Mn-III content of the Fe-Ti-doped LNMO active material and the use of Li3PO4 as the cathode-additive, which reduces transition metal deposition and prevents Li loss and cell polarization.
Article
Materials Science, Multidisciplinary
G. Premanand, D. V. Sridevi, Suresh Perumal, T. Maiyalagan, John D. Rodney, V. Ramesh
Summary: In this study, pure and Fe-doped CdSe quantum dots were prepared and characterized for their structural, optical, and morphological features. The optical bandgap values of these QDs varied, and there were differences in their electrochemical properties as well.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Chemistry, Physical
Mingzhu Li, Qingping Li, Maofeng Hu, Yongxu Du, Zhipeng Duan, Hongguang Fan, Yongpeng Cui, Shuang Liu, Yongcheng Jin, Wei Liu
Summary: In this study, a N-doped LNMO cathode material with a yolk-shell structure was successfully synthesized, exhibiting excellent cycling performance and stability even at high temperatures. This discovery provides a promising approach for developing high energy-density lithium-ion batteries with improved cycling capability.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Xu-Yong Feng, Wen-Tao Wu, Qian-Qian Huang, Yong-Chao Liu, Chong Ni, Zhi-Mei Huang, Xin Liang, Chun-Hua Chen, Hong-Fa Xiang
Summary: High entropy electrode materials have gained considerable attention for their remarkable structural stability during cycling, resulting in exceptionally long cycle life. However, the traditional equimolar strategy is not suitable for electrode materials when high capacity is desired. In this study, a LiNi0.5Mn1.5O4 cathode with high stability and long cycle life was successfully prepared using a multiple-element doping strategy (medium entropy). The co-doped LiNi0.5Mn1.5O4 exhibited a disordered structure with improved Li+ ion diffusivity, leading to better rate performance. Due to the better structure and interface stability, the co-doped LiNi0.5Mn1.5O4 showed excellent cycle stability with 92% capacity retention after 500 cycles at 1 C rate. Moreover, the specific capacity of the medium entropy sample even increased, highlighting the advantage of the medium entropy strategy in electrode materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jeffrey S. Horner, Grace Whang, David S. Ashby, Igor Kolesnichenko, Timothy N. Lambert, Bruce S. Dunn, A. Alec Talin, Scott A. Roberts
Summary: The galvanostatic intermittent titration technique (GITT) is commonly used to evaluate solid-state diffusion coefficients in electrochemical systems, but existing analysis methods have limitations in validating the derived diffusion coefficients. Researchers employed a direct-pulse fitting method to interpret GITT data and found that non-ideal diffusion coefficients were significantly more accurate than ideal ones extracted using conventional methods. This study also demonstrated the validity of a single-particle approach when the modeled radius is proportional to the total volume-to-surface-area ratio of the system.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Te Tian, Lei-Lei Lu, Yi-Chen Yin, Yi-Hong Tan, Tian-Wen Zhang, Feng Li, Hong-Bin Yao
Summary: The authors have achieved trace multiple element doping in the LNMO cathode material, which improves its electronic conductivity and Li-ion diffusivity, resulting in stable cycling performance under high areal capacity conditions.
Article
Chemistry, Analytical
Nicholas Williard, Chris Hendricks, Jaesik Chung, Michael Pecht
Summary: This study investigates the combined effect of external pressure and battery state of charge on electrode diffusion-rate properties. The results show that the relationship between pressure and the aggregate cell diffusivity is dependent on the battery's operating voltage limits, exhibiting positive, neutral, and negative correlations in different regions of the open circuit voltage range. The impact of individual electrode diffusivity on the pressure/diffusivity relationship is highlighted, with either the anode or cathode effects becoming more pronounced depending on the state of charge.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Jeffin James Abraham, Buzaina Moossa, Hanan Abdurehman Tariq, Ramazan Kahraman, Siham Al-Qaradawi, R. A. Shakoor
Summary: The NASICON-based NVPF symmetric cell exhibits long cycle life and stable performance, but suffers from capacity loss and increasing resistance with cycling. The smooth diffusion of sodium in NVPF is observed, with minor structural distortions during cycling.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Materials Science, Ceramics
Xiang Ji, Xinyi Dai, Fuzhong Wu, Yi Mai, Haijun Chen, Yijing Gu
Summary: The Sr-doped LiNi0.5Mn1.5O4 cathode material exhibits enhanced cycling stability and improved Li+ transport kinetics, which is attributed to the reduced Mn3+ content and morphological changes induced by Sr doping. Additionally, the (100) surface morphology effectively inhibits side reactions with the electrolyte and stabilizes the structure at the working voltage, leading to superior electrochemical performance.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Tao Huang, Ying Pan, Chunfeng Yan, Maoxiang Wu
Summary: In this work, it was found that the addition of 1,1,3,3-tetramethyldisiloxane (TMDS) can enhance the electrochemical properties of LiNi0.5Mn1.5O4/Li cells at high temperatures, leading to improved capacity retention and rate performance. The presence of TMDS results in the formation of a thinner and more conductive layer on the LiNi0.5Mn1.5O4 surface, along with effective scavenging of HF/F- from the electrolyte, contributing to the stabilization of LiNi0.5Mn1.5O4.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Alexander S. Gouralnik, Alexander Shevlyagin, Igor M. Chernev, Alexander Yu Ustinov, Andrey Gerasimenko, Anton K. Gutakovskii
Summary: Mg2Si films were grown on Si surfaces at high deposition rates using a pulse-type evaporator, allowing for effective accumulation on hot Si surfaces. The structure, crystal quality, and formation mechanism of the films were studied, demonstrating the potential for Si/Mg2Si solar cell technologies.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Engineering, Environmental
Jianbang Zhou, Yingyuan Chen, Chunyan Jiang, Bojana Milicevic, Maxim S. Molokeev, Mikhail G. Brik, Ivan A. Bobrikov, Jing Yan, Junhao Li, Mingmei Wu
Summary: Mn4+-activated oxyfluoroniobate phosphor (Cs2NbOF5) with internal quantum efficiency of approximately 82% has shown remarkably improved waterproof stability even without surface coating compared to commercial fluoride red-emitting phosphor. The presence of Nb5+ ions inside the phosphor plays a crucial role in enhancing the water-resistant performance of Mn4+, offering a new concept for overcoming the waterproof downside in humid conditions while maintaining luminescence efficiency. White LEDs fabricated using Cs2NbOF5:Mn4+ demonstrate high luminous efficacy (174 lm/W) and excellent color rendering properties.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Irina Antonova, Marina B. Shavelkina, Dmitriy A. Poteryaev, Nadezhda A. Nebogatikova, Artem I. Ivanov, Regina A. Soots, Anton K. Gutakovskii, Irina I. Kurkina, Vladimir A. Volodin, Vladimir A. Katarzhis, Peter P. Ivanov, Alexey N. Bocharov
Summary: A novel method for creating composite nanoparticles with various morphology and electric properties using small boron nitride nanosheets and graphene flakes is proposed. The composite nanoparticles and films fabricated from structures synthesized in helium plasma jet show significant changes in electric properties, with potential for electronic applications. The composites exhibit nonlinear current-voltage characteristics, with some showing switching up to four orders of magnitude, indicating potential for use in electronic devices such as memristors and logic elements.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Chemistry, Physical
A. M. Balagurov, I. A. Bobrikov, S. V. Sumnikov, I. S. Golovin
Summary: The evolution of structural phases and morphology of microstructure in Fe-xAl and Fe-xGa compositions were studied. It was found that changes in Al or Ga content and temperature can lead to the formation of an ordered structure and a decrease in unit-cell parameter. Specific microstructures in the form of mesoscopic clusters were observed within certain composition ranges.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Physics, Applied
M. S. Aksenov, N. A. Valisheva, D. V. Gorshkov, G. Y. Sidorov, I. P. Prosvirin, A. K. Gutakovskii
Summary: This study investigates the morphology, chemical composition, and electronic properties of Al2O3/InGaAs interfaces formed in different DC plasma conditions with and without fluorinated anodic oxide layers. The results show that thin fluorinated anodic oxide layers, along with annealing at 300°C, can reduce the density of interface states by 3-4 times over the entire bandgap. However, the interface with a fluorinated oxide is not stable and degrades when heated above 300°C, in contrast to the Al2O3/InGaAs interface.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
E. G. Zaytseva, O. Naumova, A. K. Gutakovskii
Summary: For comparing the mobility and analyzing the scattering mechanisms of carriers near semiconductor film/insulator interfaces, it is necessary to have the same distribution of free carriers in thin films. This study utilized TCAD simulations of thin-film transistors to find parameters that can tune the potential distribution and, consequently, the distribution of free carriers in films. It was found that the film regime, density of induced carriers, and gate voltage or threshold voltage of transistors are the crucial parameters affecting the distribution. The proposed approach enables a comparative analysis of the mobility in thin films and eliminates errors caused by different carrier distributions due to the coupling effect.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Zheng-Yao Li, Xiaobai Ma, Ivan A. Bobrikov, Kai Sun, Hongliang Wang, Linfeng He, Yuqing Li, Dongfeng Chen
Summary: Layered cathodes have potential for sodium-ion batteries (SIBs), but their poor electrochemical performance has hindered their development. In this study, an ordered cathode with Mg and Ti codoping was designed and investigated. The ordered cathode exhibited good structural features and electrochemical performance. The study also revealed the reaction mechanism of the ordered cathode.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
A. Shuitcev, R. N. Vasin, A. M. Balagurov, L. Li, I. A. Bobrikov, S. Sumnikov, Y. X. Tong
Summary: The thermoelastic martensitic transformation in the polycrystalline Ti29.7Ni50.3Hf10Zr10 alloy was studied using high-resolution and in situ neutron diffraction. The study found that the B19' martensite and austenite have different thermal expansion behaviors. Some disordered austenite does not participate in the martensitic transformation. The addition of Hf and Zr atoms leads to the deterioration of the crystallographic compatibility between martensite and austenite, causing large thermal hysteresis and volume changes upon transformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Tatiana Maksimchuk, Elena Filonova, Denis Mishchenko, Nikita Eremeev, Ekaterina Sadovskaya, Ivan Bobrikov, Andrey Fetisov, Nadezhda Pikalova, Alexander Kolchugin, Alexander Shmakov, Vladislav Sadykov, Elena Pikalova
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Physical
N. Yu Samoylova, I. A. Bobrikov, E. A. Korneeva, R. N. Vasin, A. M. Balagurov, I. S. Golovin
Summary: This study investigates the transition from the A2 phase to the sigma phase in Fe-46 wt%Cr alloy, as well as the kinetics of this transformation at 655 degrees Celsius. In situ neutron diffraction and X-ray diffraction methods are used to observe the phase transition and the reverse transformation. The results provide insights into the behavior of the alloy at high temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Mikhail O. Petrushkov, Demid S. Abramkin, Eugeny A. Emelyanov, Mikhail A. Putyato, Oleg S. Komkov, Dmitrii D. Firsov, Andrey V. Vasev, Mikhail Yu. Yesin, Askhat K. Bakarov, Ivan D. Loshkarev, Anton K. Gutakovskii, Victor V. Atuchin, Valery V. Preobrazhenskii
Summary: This study investigates the use of low-temperature GaAs layers as dislocation filters in GaAs/Si heterostructures. The results show that the introduction of LT-GaAs layers and post-growth cyclic annealing significantly improve the quality of GaAs layers, reducing the dislocation density and surface roughness.
Article
Crystallography
Iskander R. Vakhitov, Nikolay M. Lyadov, Vladimir I. Vdovin, Anton K. Gutakovskii, Vladimir I. Nuzhdin, Lenar R. Tagirov, Rustam I. Khaibullin
Summary: This study investigates the potential use of magnetic nanoparticles embedded into semiconductors for semiconducting spintronics. Iron ions were implanted into oxide semiconductors and TiO2 plates, and various techniques were used to analyze the microstructure, elemental composition, and magnetic properties. The results show that high-fluence ion implantation leads to the formation of magnetic nanoparticles of metallic iron beneath the surface of rutile.
Article
Materials Science, Multidisciplinary
T. S. Shamirzaev, D. R. Yakovlev, N. E. Kopteva, D. Kudlacik, M. M. Glazov, A. G. Krechetov, A. K. Gutakovskii, M. Bayer
Summary: Charged exciton recombination and spin dynamics in ultrathin InSb and AlSb quantum wells with an AlAs matrix were studied, revealing strong material intermixing and band alignment types. The circular polarization of photoluminescence Pc induced by a magnetic field showed nonmonotonic behavior at high magnetic fields. A kinetic equation model was developed to interpret the experiment and determine trion radiative lifetimes, spin relaxation times, and heavy-hole g factors for the studied structures.
Article
Electrochemistry
Nina V. Kosova, Dmitry Z. Tsydypylov
Summary: TiNb2O7 anode material with Wadsley-Roth crystallographic shear structure was prepared by solid-state synthesis and showed improved electrochemical performance after ball milling, possibly due to the formation of a conductive carbon matrix and uniform distribution of submicron particles.
Article
Materials Science, Multidisciplinary
Yingyuan Chen, Feilong Liu, Ziwang Zhang, Junyu Hong, Maxim S. Molokeev, Ivan A. Bobrikov, Jianxin Shi, Jianbang Zhou, Mingmei Wu
Summary: In this study, a novel fluoride red phosphor with good water resistance was successfully synthesized and characterized. The phosphor exhibited stable crystal structure, strong PL intensity, and better thermal and waterproof stability compared to commercial phosphors.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
