Article
Chemistry, Physical
Wanzheng Lu, Mingzhe Xue, Cunman Zhang
Summary: SSLB is regarded as a promising candidate for energy storage devices, with LLZO solid-state electrolyte playing a key role, and significant progress has been made in research, although challenges remain to be addressed.
ENERGY STORAGE MATERIALS
(2021)
Review
Chemistry, Physical
Jie Biao, Chen Bai, Jiabin Ma, Ming Liu, Feiyu Kang, Yidan Cao, Yan-Bing He
Summary: This article reviews the mechanism and solutions for Li dendrite penetration in Garnet-type Li7La3Zr2O12 (LLZO) solid-state electrolytes, including material design, interfacial adaptability, and charge transfer process. The successful inhibition of Li dendrite penetration through stabilizing LLZO phase, densification techniques, interfacial modifications, and grain boundary manipulations provides guidance for the development of LLZO-based solid-state electrolytes and ultra-stable SSLMBs.
ADVANCED ENERGY MATERIALS
(2023)
Article
Materials Science, Ceramics
Xiao Huang, Jianmeng Su, Zhen Song, Tongping Xiu, Jun Jin, Michael E. Badding, Zhaoyin Wen
Summary: The study found that by using Li6.4Ga0.2La3Zr2O12 powder calcined at 850 degrees Celsius, a cubic LLZO phase can be obtained, and ceramic pellets sintered at 1100 degrees Celsius for 320 minutes using this powder have relative densities higher than 94%, with conductivities higher than 1.2 x 10(-3) S cm(-1) at 25 degrees Celsius.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Huanyu Zhang, Faruk Okur, Claudia Cancellieri, Lars P. H. Jeurgens, Annapaola Parrilli, Dogan Tarik Karabay, Martin Nesvadba, Sunhyun Hwang, Antonia Neels, Maksym V. Kovalenko, Kostiantyn V. Kravchyk
Summary: Li dendrites form in Li7La3Zr2O12 (LLZO) solid electrolytes due to volume changes and voids at the Li metal/LLZO interface. Dense-porous LLZO membranes provide a solution by storing lithium in the pores, avoiding volume changes and void formation. The reported method of sequential tape-casting allows for the production of bilayer membranes with high performance.
Article
Chemistry, Physical
Evgeniya Ilina, Efim Lyalin, Maxim Vlasov, Artem Kabanov, Kirill Okhotnikov, Elena Sherstobitova, Mirijam Zobel
Summary: Solid electrolytes based on Li7La3Zr2O12 (LLZO) with a garnet structure are potential candidate materials for high-energy lithium and lithium-ion power sources. In this study, solid electrolytes of the Li7-xLa3Zr2-xTaxO12 system were synthesized and it was found that Ta doping can enhance the lithium-ion conductivity of the materials. The highest conductivity was observed in the compound Li6.4La3Zr1.4Ta0.6O12, indicating that moderate Ta doping is most suitable for improving Li diffusion in LLZO materials. The combined use of density functional theory (DFT) modeling, structural characterization, and conductivity measurements provides insights into this important class of Li-conducting oxides and suggestions for improving their properties.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Md Yusuf Ali, Hans Orthner, Hartmut Wiggers
Summary: Nanocrystalline cubic Al-doped Li7La3Zr2O12 (LLZO) was synthesized using a spray-flame reaction followed by a short sintering step under O-2 atmosphere. The as-synthesized nanoparticles consisted of the crystalline La2Zr2O7 (LZO) pyrochlore phase with Li present as amorphous carbonate on the surface. Intimate intermixing of the Li precursor during spray-flame synthesis is essential for forming a nanoscale product.
Article
Chemistry, Multidisciplinary
Quoc Hung Nguyen, Van Tung Luu, Hoang Long Nguyen, Young-Woo Lee, Younghyun Cho, Se Young Kim, Yun-Seok Jun, Wook Ahn
Summary: The research focused on utilizing a cubic garnet oxide electrolyte and ionic liquid in combination with a polymer electrolyte to produce a composite electrolyte membrane with high ionic conductivity. The composite electrolyte membrane was effective in suppressing lithium dendrite growth, as confirmed through symmetric lithium stripping/plating tests. The full cell showed a high specific capacity and capacity retention after 100 cycles, highlighting the potential of solid polymer electrolytes in enhancing the performance of all-solid-state batteries.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Physical
Minjea Kim, Hyun Gyu Park, Kwangjin Park
Summary: The research identified a method for pre-forming the cubic LLZO phase under HRFTP conditions, which helps improve the ionic conductivity of LLZO. Analysis using SEM and XRD confirmed the effectiveness of optimizing sintering temperature to enhance both bulk and grain boundary ionic conductivities.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Ceramics
Xinyu Ping, Qian Zheng, Bin Meng, Wu Lin, Yingquan Chen, Congcong Fang, Han Zhang, Wenke Liang
Summary: Al-LLZO-O-2 sample with the highest relative density and largest grain size demonstrates higher lithium-ion conductivity.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Xiao-Zhen Liu, Lei Ding, Yu-Ze Liu, Li-Ping Xiong, Jie Chen, Xiao-Long Luo
Summary: The Ba, Y and Al co-doped Li7La3Zr2O12(LLZO) solid electrolyte prepared by the solid-state reaction method showed improved room-temperature total conductivity after sintering, due to elimination of grain boundary resistances and densification control. By adjusting sintering temperature and time, a cubic garnet phase was obtained, resulting in enhanced total conductivity and improved morphology.
Review
Chemistry, Physical
Hamed Salimkhani, Alp Yurum, Selmiye Alkan Gursel
Summary: Lithium lanthanum zirconates (LLZOs) are a type of solid electrolyte with excellent ionic conductivity and high stability. Research has shown that the properties of LLZOs can be tailored for various applications by using supervalent dopants. Many studies have been published on the structure and site preference of compositional ions in LLZO electrolytes.
Article
Chemistry, Physical
Chujun Zheng, Jianmeng Su, Zhen Song, Tongping Xiu, Jun Jin, Michael E. Badding, Zhaoyin Wen
Summary: A co-doping strategy is proposed to enhance the performance of solid-state lithium metal batteries by optimizing the structure of the solid-state electrolyte. The addition of Li2WO4 (LWO) improves the ionic conductivity and relative density, and exhibits excellent dendrite suppression capability.
MATERIALS TODAY ENERGY
(2022)
Article
Electrochemistry
Xing Xiang, Yanhua Zhang, Huihu Wang, Chenhuinan Wei, Fei Chen, Qiang Shen
Summary: In this study, a film of silver was successfully deposited on the surface of LLZO using magnetron sputtering technique, leading to a decrease in interfacial impedance between Li7La3Zr2O12 and lithium anode. This modification improved the electrochemical performance of the battery, demonstrated by stable voltage output in lithium plating and striping tests.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Jae-Won Sim, Rae-Hyun Lee, Hyun-Kyung Kim, Jong Kyu Lee, Jung Rag Yoon, Seung-Hwan Lee
Summary: The Ga-doped Li7La3Zr2O12 (Ga-LLZO) solid-state electrolyte exhibits excellent ionic conductivity and mechanical properties for advanced batteries. However, it faces challenges of high grain boundary resistance and dendrite propagation. This study proposes a two-step sintering (TSS) method to control the microstructure and achieve lower grain boundary resistance and superior dendrite resistance in Ga-LLZO. The Ga-LLZO sample fabricated with TSS shows a superior cycling performance and increased ionic conductivity compared to the sample fabricated with the conventional sintering method. Extensive investigation into dendrite formation provides evidence that dendrites in Ga-LLZO are not solely composed of pure Li but also contain a compound with both C and O elements.
CHEMISTRY OF MATERIALS
(2023)
Article
Electrochemistry
Yusuke Yamazaki, Shotaro Miyake, Keigo Akimoto, Ryoji Inada
Summary: Garnet-type Ta-doped Li7La3Zr2O12 (LLZO) ceramic solid electrolytes with Ga2O3 additive were synthesized. The microstructure and performance of the samples with different Ga2O3 addition were investigated. The sample with 2 mol % Ga2O3 addition showed the highest tolerance for Li dendrite growth.
Article
Nanoscience & Nanotechnology
Mingwei Zan, Suting Weng, Haoyi Yang, Junyang Wang, Lufeng Yang, Sichen Jiao, Penghao Chen, Xuefeng Wang, Jie-Nan Zhang, Xiqian Yu, Hong Li
Summary: The demand for portable electronic devices has increased the need for higher energy density in layered LiCoO2 (LCO). However, its practical applications are hindered by the unstable surface structure and side reactions at high voltages (>4.5 V). In this study, a conformal and integral LiNixCoyMn2-x-yO4 spinel coating was designed on the surface of LCO using a sol-gel method, which improved cycle and rate performance and stabilized the cathode-electrolyte interface. The designed spinel coating layer was also well preserved after prolonged cycling, preventing the formation of an electrochemically inert Co3O4 phase and ensuring fast lithium transport kinetics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Pushun Lu, Yu Xia, Yuli Huang, Zhendong Li, Yujing Wu, Xue Wang, Guochen Sun, Shaochen Shi, Zhengju Sha, Liquan Chen, Hong Li, Fan Wu
Summary: By coupling FeS2 with the superionic conductor LASI-80Si, an all-solid-state battery (ASSB) is proposed to overcome the challenges associated with rechargeable FeS2 batteries, enabling wide-temperature and large-capacity applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xiao Zhang, Xiaoyun Li, Suting Weng, Siyuan Wu, Qiuyan Liu, Mengyan Cao, Yejing Li, Zhenyu Wang, Lingyun Zhu, Ruijuan Xiao, Dong Su, Xiqian Yu, Hong Li, Liquan Chen, Zhaoxiang Wang, Xuefeng Wang
Summary: The problems of humidity sensitivity and instability to high-voltage oxide cathodes in sulfide electrolytes are solved by constructing a Li2CO3 interface, leading to enhanced electrochemical performance of all-solid-state batteries.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Analytical
Xiaohui Huang, Junyang Wang, Yuanchun Lan, Chaojie Jiang, Xinhua Yuan
Summary: The spatial-temporal prediction of traffic flow is crucial for traffic management and planning. Traditional forecasting methods struggle with extracting spatial-temporal correlations due to complex spatial correlations between different roads and dynamic time patterns. This paper proposes a multi-scale temporal dual graph convolution network (MD-GCN) to improve the accuracy of traffic flow prediction by extracting multi-scale temporal dependence and local-global correlations between neighbor nodes.
Article
Computer Science, Information Systems
Hui Zeng, Chaojie Jiang, Yuanchun Lan, Xiaohui Huang, Junyang Wang, Xinhua Yuan
Summary: The paper proposes a long-term spatial-temporal graph convolutional fusion network (LSTFGCN) for traffic flow prediction modeling. By designing a synchronous spatial-temporal feature capture module and an ordinary differential equation graph convolution (ODEGCN), the model effectively learns the long short-term dependencies of spatial-temporal sequences, leading to optimal performance in traffic flow prediction.
Article
Nanoscience & Nanotechnology
Jing Xu, Yuqi Wang, Siyuan Wu, Qifan Yang, Xiao Fu, Ruijuan Xiao, Hong Li
Summary: This study investigates the crystal structures of Na3YCl6 and proposes a three-step structure construction method using functional (Y2Cl9)3- groups as building blocks to obtain three new crystal structures in the composition of Na3Y2Cl9. The transport properties, thermostability, and electrochemical window of these structures are studied using first-principles calculation methods. The results show that the principle of designing crystal structures of halides by basic blocks is effective, and the P63-Na3Y2Cl9 structure exhibits outstanding transport properties due to the coherent diffusion connecting two directions. This research will promote the understanding of the transport mechanism in halide-based electrolytes and accelerate the inverse design of inorganic crystal structures based on functional building blocks and special stacking modes.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Zhicheng Wang, Ran Han, Haiyang Zhang, Dan Huang, Fengrui Zhang, Daosong Fu, Yang Liu, Yumeng Wei, Haiqi Song, Yanbin Shen, Jingjing Xu, Jieyun Zheng, Xiaodong Wu, Hong Li
Summary: A nonflammable electrolyte is developed for high-energy-density storage battery, which consists of 1 M lithium difluoro(oxalato)borate (LiDFOB) in triethyl phosphate (TEP) and N-methyl-N-propyl-pyrrolidinium bis(trifluoromethylsulfonyl)imide [Pyr(13)][TFSI] ionic liquid (IL) solvents. The unique solvation structure of the electrolyte induces stable anion-derived electrolyte/electrode interphases, inhibiting Li dendrite growth and side reactions between TEP and electrodes.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Multidisciplinary
Quan Li, Yang Yang, Xiqian Yu, Hong Li
Summary: Researchers are pursuing high-energy-density rechargeable lithium batteries due to their revolutionary potential. We have manufactured practical pouch-type rechargeable lithium batteries with high gravimetric and volumetric energy densities, achieved through the use of high-performance battery materials and advanced process technologies.
CHINESE PHYSICS LETTERS
(2023)
Article
Energy & Fuels
Cong Hu, Wei Zheng, Bin Zhao, Yu Fan, Hong Li, Kun Zheng, Gang Wang
Summary: A comprehensive evaluation methodology is proposed for silicone-based potted modules to assess their physical and electrical properties as well as the influence of gamma-radiation on the encapsulated interface. The results show that gamma-radiation increases the crosslinking density, hardness, elastic modulus, volume resistivity, dielectric constant, and storage modulus, while decreasing the elongation at break and dielectric loss factor. The tensile strength, breakdown strength, and coefficient of thermal expansion of the interface exhibit complex trends. The partial discharge inception voltage slightly increases due to the unchanged interface bonding state and slightly decreased electric field strength at the tip.
Article
Chemistry, Multidisciplinary
Yujian Sun, Sichen Jiao, Junyang Wang, Yuanpeng Zhang, Jue Liu, Xuelong Wang, Le Kang, Xiqian Yu, Hong Li, Liquan Chen, Xuejie Huang
Summary: Cation-disordered rock-salt (DRX) materials have gained significant attention as potential cathode candidates for high-capacity lithium-ion batteries (LIBs). In this study, a large supercell model of DRX material Li1.16Ti0.37Ni0.37Nb0.10O2 (LTNNO) was developed using the reverse Monte Carlo (RMC) method in combination with neutron total scattering. Through experimental analysis and density functional theory (DFT) calculations, the existence of short-range ordering (SRO) and element-dependent behavior of transition metal (TM) site distortion were confirmed. It was found that site distortions affect the diffusion barrier for Li+ ions, expanding the theoretical percolating network of Li in DRX materials. The newly developed characterization method provides valuable insights for the design of improved DRX materials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Yana Xia, Junyang Wang, Zaizhou Wang, Chunxiang Zhang
Summary: In this study, graphene oxide modified polyurea grease was prepared by adding different amounts of exfoliated expandable graphite into commercial polyurea grease. The tribological characteristics of graphene oxide modified polyurea grease were evaluated under extremely high contacting stress. Among all the tested specimens, polyurea grease with 2.0 wt.% graphene oxide showed the best performance in reducing friction and wear.
SURFACE AND INTERFACE ANALYSIS
(2023)
Article
Nanoscience & Nanotechnology
Yu Li, Mingwei Zan, Penghao Chen, Yuli Huang, Xilin Xu, Chengzhen Zhang, Zhuoyuan Cai, Xiqian Yu, Hong Li
Summary: The commercial viability of LiCoO2 as a cathode material is hindered by its structural degradation and surface passivation at high voltages. This study presents a facile in situ coating strategy to mitigate these issues, resulting in a stable coating layer on LiCoO2, which effectively reduces side reactions and surface passivation. The coated LiCoO2 exhibits favorable electronic and ionic conductivity, with a high capacity retention rate after prolonged cycling.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Chunhong Qi, Haoyu Yang, Ziqi Sun, Haifeng Wang, Na Xu, Guihua Zhu, Lianjun Wang, Wan Jiang, Xiqian Yu, Xiaopeng Li, Qi Xiao, Pengpeng Qiu, Wei Luo
Summary: The introduction of adjacent metal-N-4 single atoms greatly improves the performance of Fe atomic cluster catalysts in oxygen reduction reaction (ORR). Density functional theory (DFT) calculations and experimental analysis reveal that Cu-N-4 single atoms act as a modulator, enhancing O-2 adsorption and cleavage on the active center of Fe atomic cluster catalysts. The resulting catalyst, deposited on nitrogen-doped mesoporous carbon nanosheet, demonstrates outstanding ORR performance in alkaline and acidic conditions, as well as high power density in a zinc air battery.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Biochemistry & Molecular Biology
Han Li, Hanghang Wang, Aiping Yang, Mingzhen Xue, Junyang Wang, Qi Lv, Jian Liu, Lihong Hu, Yinan Zhang, Xiachang Wang
Summary: Researchers found that active saponin constituents from Gynostemma pentaphyllum can protect the liver. They specifically studied a gypenoside, XLVI, and found that it can ameliorate both acute and chronic liver injuries and reduce fibrogenesis. XLVI inhibited the activation of hepatic stellate cells and ECM deposition in vitro. The study also showed that XLVI upregulated the protein expression of protein phosphatase 2C alpha, enhancing its activity along with a PP2C alpha agonist, gypenoside NPLC0393. These findings shed light on the molecular mechanisms and potential therapeutic function of Gynostemma pentaphyllum in treating liver fibrosis.