Article
Chemistry, Physical
Longzhen You, Guangxin Li, Ben Huang, Binbin Chu, Tao Huang, Aishui Yu
Summary: Effective and uniform surface modification is achieved by using a liquid-phase assisted method to synthesize 1 W@NCM811, which results in a uniform WO3/Li2WO4 coating on the surface. The coating acts as an ideal protective layer, stabilizing the cathode/electrolyte interface and improving electrochemical kinetics and thermal stability. The 1 W@NCM811-based cathode shows significantly enhanced performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Yanchen Liu, Yafen Chen, Jing Wang, Wei Wang, Zhiyu Ding, Leyuan Li, Yang Zhang, Yida Deng, Junwei Wu, Yanan Chen
Summary: The hierarchical yolk-shell structured Li1.2Mn0.54Ni0.13Co0.13O2 cathode shows an initial coulombic efficiency of 85.8% and outstanding capacity retention rates of 89.1% after cycling at 2.0 C for 200 cycles. After cycling at 10.0 C for 500 cycles, the capacity retention rate is 93.8%, and for 1,000 cycles, it is 85.2%.
Article
Chemistry, Multidisciplinary
Guojun Zha, Ouyang Chuying, Shungao Yin, Kaiqing Yao, Seema Agarwal, Naigen Hu, Haoqing Hou
Summary: The modified Ni-rich LiNi0.8Co0.10Mn0.1O2 (NCM811) cathode as PI3-NCM811 shows significantly improved cycling stability and delayed secondary crystal cracking. The PI3-NCM811 cathode exhibits better capacity retention after 500 cycles compared to NCM811.
Article
Materials Science, Multidisciplinary
Zhiheng Wang, Shuxin Zhuang, Gaoxing Sun, Xiaoxiao Pan, Jiayi He, Yuqing Sun, Shengyu Jiang, Yan Ren
Summary: Surface coating with N-doped carbon layer can effectively improve the capacity fading issue of ternary nickel-rich layered oxide LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode material for lithium-ion batteries. The N-doped carbon coating disperses more uniformly than carbon coating due to the formation of Ni-N bond. The introduced N element can inhibit the reduction of Ni3+ to Ni2+, leading to improved structural stability.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Chemistry, Physical
Xinjin Gao, Zhenpeng Xiao, Lili Jiang, Chao Wang, Xinru Lin, Lizhi Sheng
Summary: A yolk-shell porous Fe3O4@C/ graphene nanosheet structure is designed to address the volume change and dissolution/aggregation issues of Fe3O4 anode materials. This structure not only provides space for volume change but also restricts overexpansion, resulting in improved capacity retention. Additionally, the porous Fe3O4 promotes ion transport, and the carbon shell enhances overall conductivity.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Huarong Xia, Yuxin Tang, Oleksandr I. Malyi, Zhiqiang Zhu, Yanyan Zhang, Wei Zhang, Xiang Ge, Yi Zeng, Xiaodong Chen
Summary: A new deep-cycling architecture has been developed to break the theoretical capacity limit of conventional Li-ion batteries, which offers higher capacity and energy storage efficiency by utilizing movable ions in both electrolyte and electrodes. This architecture shows 57.7% more capacity and 84.4% retention after 2000 cycles, indicating its potential for next-generation energy storage devices.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Yuzhen Hou, Yanbiao Ren, Tiesheng Shi, Jiaqi Li, Honglei Li, Lincai Zhang, Yong Liu, Yuqin Wan, Shichao Zhang, Dandan Zhu
Summary: One of the major challenges in using high Ni content layered oxides (NLOs) in lithium-ion batteries is their low cycling stability, particularly for NLOs with Ni content >= 60%. Surface coatings by electro-chemically inert inorganic compounds and lattice doping by cations are two promising methods to improve the drawbacks of such NLOs. This study shows that uniform surface Al2O3 coating and bulk Zr4+ doping on LiNi0.8Co0.1Mn0.1O2 (NCM811) using isopropanol alcoholysis and annealing at >= 800 degrees C can enhance the specific capacity and cycling life of the NCM@Al2O3 + Zr active material, while suppressing voltage attenuation during cycling due to a synergetic effect of the Al2O3 coating and Zr4+ doping.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Energy & Fuels
Hailin Zhang, Jiujun Zhang
Summary: By overviewing the issues and challenges of NCM811 materials, as well as summarizing the modification strategies for these materials, this paper emphasizes on the future development trend and perspectives of high nickel NCM811 materials.
Article
Chemistry, Physical
Bo Li, Wen Zhang, Ting Zhang, Shanghai Wei, Wei Gao
Summary: The yolk-shell structure is a promising material design for anodes in batteries due to its ability to accommodate volume changes. However, achieving coordination between space and core size is a challenge. In this study, a strategy of in-situ shell-to-core evolution was proposed to accurately control the void space and core size. A composite with controlled core size and void space was synthesized and demonstrated excellent cycling stability and high volumetric energy density.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Anand Rajkamal, Hern Kim
Summary: The higher Ni content with less cobalt usage in lithium nickel cobalt manganese oxide cathode materials results in higher power rating and energy density in lithium-ion batteries. Cation doping effectively suppresses the mixing of Ni ions in the lithium layer. Different cationic dopants have varying effects on the structural stability and performance of the cathode material.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Gyori Park, Hyun-Suk Kim, Kyung Jin Lee
Summary: The increased demand for energy storage devices has driven the market growth of Li-ion batteries. However, concerns about environmental pollution from waste and manufacturing process pollutants have arisen. N-methylpyrrolidone, a toxic organic pollutant used in the manufacturing process, has attracted attention. Therefore, the dry-based process for electrodes has become of interest. This study reports the fabrication of a cathode using a mortar-based dry process with carbon nanotubes, which showed improved electrochemical performance compared to carbon black.
Article
Materials Science, Multidisciplinary
Zhaofeng Yang, Ling Chen, Huawei Zhu, Yihua Zhu, Hao Jiang, Chunzhong Li
Summary: In this study, a dual-modification strategy of surface coating and bulk doping was used to achieve high-rate single crystal lithium-ion battery cathode material. By improving the surface coating and chemical stability, the cycling performance and energy density of the battery were greatly enhanced, laying the foundation for the development of long-range electric vehicles.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Chenhui Yan, Qinong Shao, Zhihao Yao, Mingxi Gao, Chenyang Zhang, Gairong Chen, Qianwen Sun, Wenping Sun, Yongfeng Liu, Mingxia Gao, Hongge Pan
Summary: LMLOs are promising cathode materials for high-energy density Li-ion batteries. However, capacity fading, voltage decay, and low Coulombic efficiency hinder their practical application. In this study, a multifunctional surface construction is conducted to enhance the electrochemical performance of LMLO cathode materials.
Article
Materials Science, Multidisciplinary
Hui Xu, Can Zhang
Summary: Pure tin anode in lithium-ion batteries suffers from capacity fading and short cycle life due to huge volume expansion, which can be improved by coating and preconstructing void space. Introducing a mechanical prelithiation method significantly enhances the performance of prelithiated Sn/C@ZrO2 anode, achieving higher Coulombic efficiency and improved cycle stability in full-cell testing. This encouraging improvement demonstrates the potential of coated tin anode for high-performance lithium-ion full cells.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Hui Chang, Yuhao Chen, Nan Zhang, Yan-Rong Zhu, Ting-Feng Yi
Summary: FePO4-coated Li5Cr7Ti6O25 nanocomposites were successfully prepared via a simple sol-gel method and calcination procedure, demonstrating improved stability and enhanced performance.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Physical
Guojun Zha, Leshu Yu
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
(2016)
Article
Chemistry, Inorganic & Nuclear
G. -J. Zha
JOURNAL OF STRUCTURAL CHEMISTRY
(2017)
Article
Nanoscience & Nanotechnology
Zha Goujun, Zhang Fayun
MICRO & NANO LETTERS
(2017)
Article
Chemistry, Physical
Zha Guojun, Hu Naigen
Article
Materials Science, Multidisciplinary
Guojun Zha, Naigen Hu, Minhua Jiang, Xiangming Zeng, Haoqing Hou
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2019)
Article
Chemistry, Physical
Guojun Zha, Naigen Hu, Shangtie Liao, Haoqing Hou
Article
Engineering, Environmental
Guojun Zha, Wei Hu, Seema Agarwal, Chuying Ouyang, Naigen Hu, Haoqing Hou
Summary: By partially substituting Co with Fe, a new cathode material (Fe3-NCM871) with significantly enhanced electrochemical performance was developed. This material showed higher initial capacity, rate capacity, and cycle stability compared to the conventional cathode material NCM811. Density functional theory calculations confirmed that the improved performance was due to reduced Ni/Li exchange content and linear Ni2+-O2--Fe3+ superexchange between layers.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Qihang Zha, Naigen Hu, Chonghu Song, Haoqing Hou, Shangtie Liao, Guojun Zha
Summary: The application of Li4Ti5O12 coating on the NCM811 cathode to form the T2-NCM811 cathode can significantly reduce particle cracking and improve cyclic stability. Additionally, the coating inhibits secondary crystal cracking, protects internal particles, and enhances the electrode performance.
Article
Chemistry, Multidisciplinary
Guojun Zha, Ouyang Chuying, Shungao Yin, Kaiqing Yao, Seema Agarwal, Naigen Hu, Haoqing Hou
Summary: The modified Ni-rich LiNi0.8Co0.10Mn0.1O2 (NCM811) cathode as PI3-NCM811 shows significantly improved cycling stability and delayed secondary crystal cracking. The PI3-NCM811 cathode exhibits better capacity retention after 500 cycles compared to NCM811.
Article
Materials Science, Composites
Chuyun Cheng, Hangzhong Liu, Ouyang Chuying, Naigen Hu, Guojun Zha, Haoqing Hou
Summary: PUC separator filled with ceramic materials was prepared using electrostatic spinning technique. It showed superior properties compared to commercial polypropylene separator, including smaller pore size, higher porosity, higher liquid absorption, and higher ionic conductivity. The electrode composed of PUC separator and NCM811 cathode material exhibited low interfacial resistance and good rate performance. It maintained a high discharge capacity even after 200 cycles.
COMPOSITES COMMUNICATIONS
(2022)
Article
Electrochemistry
Guojun Zha, Naigen Hu, Yongping Luo, Xinxin Fu, Hong Jin, Ling Li, Qiang Huang, Chuying Ouyang, Haoqing Hou
Summary: A lightweight and self-standing GPI-NCM811 electrode was developed by filling PVDF and acetylene black-coated NCM811 material into graphitized polyimide. This electrode showed higher initial specific capacity and Coulombic efficiency compared to NCM811 electrode. The GPI-NCM811 electrode also exhibited better capacity retention after 500 cycles due to its conductive network structure and mixed coating.
ELECTROCHIMICA ACTA
(2023)
Article
Engineering, Chemical
Guojun Zha, Naigen Hu, Yongping Luo, Fahui Wang, Runsheng Wu, Yunming Li, Haiyan Fu, Xinxin Fu
Summary: By partially replacing Co with Fe to prepare Fe1-NCM811 electrode material, the degree of Ni/Li disorder can be significantly reduced, and it exhibits higher discharge capacity, rate capacity, and cycle stability compared to NCM811 cathode.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Chemistry, Physical
Hong Jin, Laihong Zhou, Guojun Zha, Ping Huang, Fahui Wang, Shuigen Li, Minhua Jiang, Chen Liu
Summary: Electrocatalysts with high efficiency and low cost are being developed for commercial application in energy conversion systems. In this study, biochar-based electrocatalytic materials (RHFeN) with oxygen reduction catalytic activity were synthesized using rice husk as a carbon precursor and doping it with Fe metal salt. The experimental results showed that the RHFeN catalyst had an amorphous carbon structure with uniformly embedded nanometal composite particles. The catalyst exhibited excellent ORR activity when the pyrolysis temperature of rice husk was 400°C, the added Fe salt was 2.0 mL, and the etching temperature of ammonia was 800°C.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Polymer Science
Yuyin Zhang, Hongtao Guo, Shaohua Jiang, Zhaoyu Hu, Guojun Zha, Kunming Liu, Haoqing Hou
Summary: Polyimide (PI) is commonly used in microelectronics due to its excellent properties. To meet the low dielectric loss requirement, PI/carbon quantum dots (PI/CQDs) composite films were developed. The introduction of CQDs significantly reduced the dielectric loss while maintaining the mechanical and thermal properties of the film.