Article
Electrochemistry
Dan Shao, Dewei Rao, Aihua Wu, Xiangyi Luo
Summary: The introduction of large cations can improve the electrochemical performance of Li-ion batteries, but excessive concentration can hinder the transfer of lithium ions.
Article
Chemistry, Physical
Ahmed Chahbaz, Fabian Meishner, Weihan Li, Cem Uenluebayir, Dirk Uwe Sauer
Summary: This study investigates the cyclic and calendar ageing of 43 same-typed LTO cells under 16 different operation conditions. Results show a two-stage ageing mechanism in which the anode and cathode gradually limit the extractable capacity. Additionally, a capacity gain of up to 2.42% is observed for cells operated and stored below 50% SOC.
ENERGY STORAGE MATERIALS
(2021)
Article
Polymer Science
Christina Toigo, Milan Kracalik, Elke Bradt, Karl-Heinz Pettinger, Catia Arbizzani
Summary: The rheological properties of electrode slurries have been studied for various combinations of active materials and binders, with a shift towards water-based electrode manufacturing becoming more important. While different solvents offer benefits in terms of sustainability and safety, they also present challenges such as slurry stability issues. Li4Ti5O12 (LTO) active material shows good long-term stability and can be processed in aqueous solutions, but combining it with sodium alginate (SA) as a binder presents challenges in slurry stability. In this study, a comprehensive rheological analysis was conducted on anode slurries consisting of LTO and SA, with the use of surfactants to improve stability compared to surfactant-free slurries.
Article
Chemistry, Physical
Yeyoung Ha, Steven P. Harvey, Glenn Teeter, Andrew M. Colclasure, Stephen E. Trask, Andrew N. Jansen, Anthony Burrell, Kyusung Park
Summary: The LTO/LMO chemistry shows promising potential for BTMS applications, with good long-term cycle performance but facing degradation issues such as continuous electrolyte decomposition at the anode and loss of Li inventory. Addressing these challenges will be key to developing successful LTO/LMO cells.
ENERGY STORAGE MATERIALS
(2021)
Article
Energy & Fuels
Diganta Saikia, Juti R. Deka, Yu-Hao Zeng, Hung-Cheng Hsu, Yi-Ching Chen, Hsien-Ming Kao, Yung-Chin Yang
Summary: A new nanocomposite system based on Ni-doped Mn3O4 nanoparticles embedded in a three-dimensional porous carbon nanopipes framework CMK-5 is developed and evaluated as an anode for rechargeable batteries. The nanocomposite exhibits outstanding discharge capacity and cycle performance for both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs), demonstrating its promising potentials as an anode material.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Review
Chemistry, Physical
Yichi Zhang, Qianqian Jiang, Peng Lang, Nannan Yuan, Jianguo Tang
Summary: Black phosphorus was first synthesized in 1914 and regained attention in 2014 with the discovery of 2D BP. This review discusses the preparation, catalytic potential, sensor performance, and application prospects of BP, emphasizing its advantages compared to precious metals and the need for further research in the field.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Patrick Muenster, Marcel Diehl, Joop Enno Frerichs, Markus Boerner, Michael Ryan Hansen, Martin Winter, Philip Niehoff
Summary: The study demonstrates that applying a 2C C-rate can reduce the formation time of lithium ion batteries, but may also result in the occurrence of lithium plating. However, using different C-rates during formation process does not significantly affect the thermal safety and cycling performance.
JOURNAL OF POWER SOURCES
(2021)
Article
Physics, Applied
Yusuke Mizuta, Kohei Shizukawa, Rie Takahara, Kei-Ichiro Murai, Toshihiro Moriga
Summary: Rock-salt-type Li-Ti oxynitride (LiTinOxNy, n = 1, 1.25, 1.5, 1.75, and 2) was synthesized using solid-phase reaction. The best charge/discharge characteristics were achieved with a Ti/Li ratio of 1.25, resulting in a maximum discharge capacity of 140 mAh/g.
MODERN PHYSICS LETTERS B
(2022)
Article
Chemistry, Physical
Pritamkumar V. Shinde, Dimple P. Dutta
Summary: This study aims to improve the electrochemical performance of tavorite-structured LiFePO4F by co-doping vanadium and sodium ions. The doped cathodes showed reduced particle size, improved reversible capacities, stable cycle performance, better rate capability, and decreased charge transfer resistance. Sodium addition proved to be beneficial for improving the charge transfer kinetics in the lithium vanadium fluorophosphate-based cathodes for lithium-ion batteries.
Article
Materials Science, Multidisciplinary
Shi-Fei Huang, Yao Lv, Da Tie, Yang Yu, Yu-Feng Zhao
Summary: In this study, a high-performance lithium-ion battery full cell was assembled using commercial LiNi0.33Co0.33Mn0.33O2 as the positive electrode and a mixture of Li4Ti5O12/hard carbon as the negative electrode. The optimal ratio of LTO and HC was found to be crucial in manipulating the electric conductivity and electro-reaction platform. The constructed full cell with 10 wt% HC demonstrated the best electrochemical performance, surpassing all systems within the study range and previous literature.
Article
Materials Science, Ceramics
Jiatai Wang, Yuanyuan Li, Shishi Wei, Shunli Hou, Geng Zhou, Xiaocen Yan, Ruheng Xi, Xiaoyi Hou
Summary: Through doping B3+ using a high-temperature solid-phase method, the electrochemical properties of the LiNi0.815Co0.15Al0.035O2 cathode (NCA) were significantly improved. X-ray diffraction analysis and Rietveld refinement showed that B3+ enhanced lattice ordering by minimizing Li+/Ni2+ mixing. Scanning electron microscopy observations indicated that B3+ doping changed the particle morphology. The specific discharge capacities of 1.5% B-NCA were 178.31 and 123.74 mAhg 1 at 0.2 and 5C, respectively. After 100 cycles, the specific discharge capacity was 176.29 mAhg 1 at 0.2C with a capacity retention of 98.87%. Boron doping significantly improves the structural stability of nickel-rich cathode materials by suppressing the detrimental H2 & RARR;H3 phase transition, thus improving the electrochemical performance of nickel-rich ternary lithium-ion batteries.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Ji Ma, Yuankun Li, Xiaojie Wei, Chunting Liu
Summary: Reduction roasting strategy was employed to transform hematite into powerful anode materials to store Li+, Na+, and K+ ions, constructing a porous structure to enhance ion accessibility. The newly-designed anodes were tested for storage capacity, cycling stability, and rate performances, while cyclic voltammetry curves and electrochemical impedance spectra were measured to unveil ion-storage mechanisms.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Polymer Science
Xingang Liu, Jiang Tan, Xi Li, Chuhong Zhang
Summary: In this study, hierarchical MoS2/C quasi-hollow microspheres were prepared via a hydrothermal process with the addition of glucose, which facilitated the formation of spherical morphology and acted as nuclei for MoS2 growth, leading to enhanced performance in lithium ion batteries. The method demonstrated excellent cycling stability and rate capability, showing superior performance compared to bulk MoS2, indicating a promising strategy for the preparation of anode materials for LIBs.
Article
Green & Sustainable Science & Technology
John D. Graham, John A. Rupp, Eva Brungard
Summary: The rapid growth in global demand for lithium is driven by the need for batteries in plug-in electric vehicles and grid-scale energy storage. However, heavy dependence on lithium could pose energy security risks as China dominates the supply chain. While there are alternative technologies to make lithium mining more sustainable, the commercialization timeline remains uncertain.
Article
Biotechnology & Applied Microbiology
Gordan Bedekovic, David Tenjer
Summary: This study presented the liberation of electrode materials via attrition scrubbing to separate Al and Cu foil from graphite and LiCoO2 particles. Results showed that the recovery rate of graphite and LiCoO2 particles varied from 49.52% to 82.30%, with impeller speed demonstrating the strongest influence on the attrition scrubbing process.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Materials Science, Ceramics
Amir Khesro, Fawad Ahmad Khan, Raz Muhammad, Asif Ali, Majid Khan, Dawei Wang
Summary: Lead-free ceramics with single/mixed perovskite structure and relaxor behavior were successfully synthesized through a solid-state sintering route. The addition of Nd3+ significantly enhanced the breakdown strength and conversion efficiency.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Muhammad Faizan, Sajjad Hussain, Mobinul Islam, Ji-Young Kim, Daseul Han, Jee-Hwan Bae, Dhanasekaran Vikraman, Basit Ali, Saleem Abbas, Hyun-Seok Kim, Aditya Narayan Singh, Jongwan Jung, Kyung-Wan Nam
Summary: In this study, a phase engineering strategy was explored to improve the electrochemical performance of transition metal sulfides (TMSs) as anode materials for lithium-ion batteries (LIBs). MoS2 nanostructures were synthesized using a one-pot hydrothermal approach. By simple calcination in the temperature range of 200-300 degrees C, MoS2 and MoO3 phases can be readily controlled. The optimized MoO3@MoS2 hybrid exhibited enhanced performance compared to pristine MoS2 and MoO3, attributed to the formation of a MoO3 passivation layer and reactive interfaces between the two phases.
Article
Chemistry, Multidisciplinary
Aditya Narayan Singh, Amir Hajibabaei, Miran Ha, Abhishek Meena, Hyun-Seok Kim, Chinna Bathula, Kyung-Wan Nam
Summary: Cation-disordered rocksalt (DRX) cathodes have shown potential as high-energy density materials for lithium-ion battery technology. In this study, we synthesized Na-doped DRX as an efficient electrocatalyst for oxygen evolution reaction (OER). The Na-doped DRX exhibited superior electrochemical behavior compared to benchmark IrO2, with higher current density, lower overpotential, and better stability. The improved OER activity of Na-doped DRX was supported by experimental data and density functional theory calculations.
Article
Energy & Fuels
Alfred Bekoe Appiagyei, Lois Asiedua-Ahenkorah, Chinna Bathula, Hyun-Seok Kim, Sung Soo Han, Kummara Madhusudana Rao, Daniel Adjah Anang
Summary: The utilization of manganese-based compounds with rich chemistry has sparked interest in energy storage technologies such as supercapacitors and rechargeable batteries. By coating graphitic carbon layers around MnMoO4 using a one-pot hydrothermal approach, a crystalline microcube-shaped structure embedded in a carbon matrix (su-GC@MnMoO4) was formed, resulting in peculiar electronic properties and significantly enhanced intrinsic electrochemical properties. In a two-electrode system of an asymmetric supercapacitor, su-GC@MnMoO4 demonstrated a specific energy of 35.4 Wh kg-1 and a specific power of 223 W kg-1, with 96.7% of initial capacitance retained after consecutive 10,000 cycles.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Materials Science, Multidisciplinary
Raja Umair Khan, Izaz Khan, Basit Ali, Raz Muhammad, Abdus Samad, Attaullah Shah, Kaixin Song, Dawei Wang
Summary: In this study, a solid state route was used to prepare a lithium molybdate, Li4Mo5O17, which is of great interest in ultra-low temperature cofired ceramics (ULTCC) technology. X-ray diffraction and Raman spectroscopy analysis confirmed the formation of a single phase triclinic structure. The polaron model was applied to explain the changes in relative permittivity and dielectric loss with frequency. The sample exhibited excitonic and deep-level emissions at the excitation of 514 nm, contributing to its lossy nature. The experimentally calculated direct optical band gap energy was consistent with the predicted energy gap through density functional theory (-3.07 eV). The electrochemical study showed a high specific capacitance of -252.5 F/g at a low scan rate of 5 mV/s.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Aditya Narayan Singh, Amir Hajibabaei, Muhammad Hanif Diorizky, Qiankai Ba, Kyung-Wan Nam
Summary: By utilizing acid treatment and bypassing cation/anion doping strategies, the participation of lattice oxygen mechanism (LOM) can be significantly enhanced to boost oxygen evolution reaction (OER) efficiency.
Article
Chemistry, Physical
Basit Ali, Raz Muhammad, Mobinul Islam, Daniel Adjah Anang, Da-Seul Han, Iqra Moeez, Kyung Yoon Chung, Min kyung Cho, Ji-Young Kim, Min-Gyu Kim, Kyung-Wan Nam
Summary: Cd2+ doping improves the electronic conductivity and capacity of Li4-xCdxTi5O12 anode material for lithium-ion batteries. The Cd-doped LTO electrodes demonstrate advantageous features, including enhanced cycling performance and high-rate capability.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Madagonda M. Vadiyar, Ji-Young Kim, Jee-Hwan Bae, Kyung-Wan Nam
Summary: A simple synthesis method was reported to prepare porous carbon materials with ultra-high nitrogen content, high specific surface area, and beneficial trace metal content. The method involved the preincorporation of an imidazole linker into ordered CTFs and the site-specific covalent growth of ZIFs. The resulting carbon super-heterostructures exhibited remarkable energy density and cyclic stability when used as a positive electrode in an asymmetric supercapacitor.
Review
Chemistry, Multidisciplinary
Aditya Narayan Singh, Mobinul Islam, Abhishek Meena, Muhammad Faizan, Daseul Han, Chinna Bathula, Amir Hajibabaei, Rohit Anand, Kyung-Wan Nam
Summary: Rechargeable sodium-ion batteries are emerging as a viable alternative to lithium-ion batteries due to their abundant and less toxic raw materials. With the increasing reliance on renewable energy sources and the concerns regarding the sustainability of lithium, sodium-ion batteries have gained attention as a potential energy storage alternative. High-entropy chemistry has also emerged as a promising new paradigm to enhance energy density and advance battery technology to meet the growing energy demands.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Liang Fang, Daseul Han, Seongkoo Kang, Un-Seon Heo, Kyung-Wan Nam, Yong-Mook Kang
Summary: Li-rich layered oxides have the potential to be high-energy-density cathodes for lithium-ion batteries, but their ultimate energy density is still uncertain due to a lack of comprehensive understanding of the first-cycle irreversible capacity. This study reports a non-monotonic irreversible capacity behavior governed by the delithiation depth in Li-rich chemistry, Li1.2Ni0.13Co0.13Mn0.54O2. Contrary to previous beliefs, the irreversible capacity reaches a maximum when the delithiation depth corresponds to x = 0.4 in LixNi0.13Co0.13Mn0.54O2. The non-monotonic irreversible capacity is fully recoverable and strongly correlates with the discharge capacity during deep discharge. Operando synchrotron X-ray diffraction reveals a metastable phase transition to an overlithiated Li2MO2 1T structure during deep discharge, and scanning transmission X-ray microscopy combined with X-ray absorption spectroscopy confirms unrecoverable oxygen release triggered at x < 0.2 in LixNi0.13Co0.13Mn0.54O2. These results provide important insights and guidance for improving the energy efficiency of Li-rich layered cathodes.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Physical
Ji-Su Kim, Young Jung Kim, Daseul Han, Kyung-Wan Nam, Gihan Kwon, Tae Wook Heo, Hun-Gi Jung, Kyung Joong Yoon, Hyoungchul Kim
Summary: Amorphous sulfides are promising solid electrolyte materials due to their deformability and Li-ion conductivity. However, the complex atomic structure of these materials poses challenges in tuning their properties. In this study, structural mapping of glassy sulfide solid electrolytes composed of different anion clusters was performed using X-ray-based pair distribution function (PDF) and reverse Monte-Carlo (RMC) methods, showing potential for tuning Li-ion conductivity. A new glassy sulfide with a mixed anion framework of two halogens (Br and I) showed the highest Li-ion conductivity reported for any glass sulfide. Molecular dynamics simulations confirmed that flexible coordination contributed to the superior Li-ion conductivity.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Muhammad Ahsan Saeed, Muhammad Faizan, Tae Hyuk Kim, Hyungju Ahn, Ji-Young Kim, Kyung-Wan Nam, Jae Won Shim
Summary: Organic photovoltaics show promise for driving off-grid IoT devices, and the use of two-dimensional nanostructured transition metal sulfides can significantly enhance their efficiency.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Review
Chemistry, Inorganic & Nuclear
Aditya Narayan Singh, Kamrul Hassan, Chinna Bathula, Kyung-Wan Nam
Summary: This review presents current knowledge about the degradation mechanism of lithium-ion batteries, focusing on the fundamentals, novel materials, and theoretical models. It emphasizes that the degradation process is not only related to charge-discharge cycles, but also influenced by synthesis-induced stress.
DALTON TRANSACTIONS
(2023)
Review
Electrochemistry
Liang Fang, Mingzhe Chen, Kyung-Wan Nam, Yong-Mook Kang
Summary: Li-rich layered oxides with reversible oxygen redox are promising cathodes for high-energy-density lithium-ion batteries. However, their electrochemical profiles differ before and after oxygen redox activation. In this review, we discuss the general redox evolution of Li-rich layered cathodes upon activation of reversible oxygen redox and summarize various synchrotron X-ray spectroscopy methods for identifying charge compensation. The redox evolution processes of Li-rich 3d/4d/5d transition metal O3 type layered cathodes are also examined, emphasizing the influence of both transition metal type and composition on redox behavior.
