Article
Multidisciplinary Sciences
Byeong-Gyu Chae, Seong Yong Park, Jay Hyok Song, Eunha Lee, Woo Sung Jeon
Summary: This study demonstrates the evolution of Li compositional gradient in the cathode after charge-discharge cycles using a complementary study via atom probe tomography and scanning transmission electron microscopy. The research shows that the depth of the Li concentration gradient expands proportionally with the number of cycles and the capacity to accommodate Li ions is determined by the degree of structural disordering.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Environmental
Hang Dong, Miao Xie, Mingzhi Cai, Hao Liu, Zhuang Zhang, Bin Ye, Pei Zhao, Wujie Dong, Fuqiang Huang
Summary: In this study, a facile fluorine glaze modification method is proposed to improve the performance of nickel-rich layered cathode, preventing grain cracking and surface collapse, and promoting lithium-ion transport.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Peng Jia, Yunna Guo, Dongliang Chen, Jingming Yao, Xuedong Zhang, Jianguo Lu, Yuqing Qiao, Liqiang Zhang
Summary: Li-CO2/O-2 batteries are a promising energy storage technology that not only provide ultrahigh discharge capacity but also capture CO2 and convert it into renewable energy. This study used copper selenide nanosheets as the air cathode medium to investigate the electrochemical behavior of Li-CO2/O-2, Li-O-2, and Li-CO2 batteries. The research offers insights into the potential development of high-performance Li-CO2/O-2 batteries for energy storage applications.
Article
Chemistry, Physical
Pei Li, Yangyang Chen, Rui Li, Bo Yu, Wang Pu, Mingshan Wang, Junchen Chen, Zhiyuan Ma, Bingshu Guo, Xing Li
Summary: A novel flame retardant fluorine-rich electrolyte (FFT) was designed and studied in this research, which exhibited noninflammability, low viscosity, good wettability and fluidity, and high oxidation stability. The electrolyte enabled high-energy density lithium metal batteries to maintain good capacity performance and exhibited excellent discharge capacity at low temperatures.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Sergey Yu. Luchkin, Maria A. Kirsanova, Dmitry A. Aksyonov, Svetlana A. Lipovskikh, Victoria A. Nikitina, Artem M. Abakumov, Keith J. Stevenson
Summary: Li-rich layered metal oxides have been extensively studied as potential positive electrode materials for Li-ion batteries. This research investigates the cycling-driven electrochemical activation process in Li-rich materials, which leads to an increase in reversible capacity. The activation process involves oxidation and reduction reactions, with the rate being influenced by the cycling rate.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Yoo Jung Choi, You Jin Kim, Suji Kim, Ga Yoon Kim, Won-Hee Ryu
Summary: Layered cathode materials, such as LiCoO2, have been synthesized for Li-ion batteries using a direct solution-calcination strategy. The addition of polyvinylpyrrolidone (PVP) as a functional agent in the synthesis process helps to eliminate surface Li residues and promote a uniform particle distribution. The solution-calcined cathode material shows improved cycling stability and rate capability compared to commercial LCO, with suppressed phase transition. This research provides a simple and versatile method for the synthesis of cathode materials, avoiding complicated steps and the formation of unwanted residual lithium compounds.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Shuang Li, Yipeng Sun, Ning Li, Wei Tong, Xueliang Sun, Charles T. Black, Sooyeon Hwang
Summary: In this study, two different types of porous structures in high-voltage lithium, manganese-rich layered cathodes are revealed, along with the significance of the interface between the cathode and electrolyte in solid-state batteries. Nanopores are found near the interface, while nanovoids are formed during in situ Li+ extraction. Despite the development of nanovoids, the layered structure is preserved.
Article
Chemistry, Physical
Vairavel Mathayan, Kenji Morita, Bun Tsuchiya, Rongbin Ye, Mamoru Baba, Daniel Primetzhofer
Summary: The study demonstrates an ion beam-based analytical method with high depth resolution and sensitivity for depth profiling Li and O in thin-film batteries. Reversible Li transport from the anode to the cathode and O transport from the anode to the cathode were observed during charge and discharge cycles, while O transport was not observed in further charging and discharging processes.
MATERIALS TODAY ENERGY
(2021)
Article
Materials Science, Ceramics
Rui He, Aijia Wei, Xue Bai, Lihui Zhang, Xiaohui Li, Jinping Mu, Xi Zhang, Jianmin Ge, Zhenfa Liu
Summary: The recent development of Li-ion batteries based on Ni-rich cathodes with high specific capacity has sparked significant interest. However, the challenge of rapid capacity decay and poor thermal stability faced by cathodes with high Ni concentration has prompted the exploration of alternative solutions, such as in situ coating methods like the application of a LaPO4/Li3PO4 (LP) layer. The LP-modified cathode material demonstrates improved capacity retention and resistance to microcracking during charge/discharge cycling.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Hyung Gi Kim, Yong Joon Park
Summary: Lithia-based cathodes have high capacity but are susceptible to electrolyte reactions, leading to decreased electrochemical performance. Developing a MgF2 coating through in situ electrochemical reactions effectively protects the cathode, with the thin coating not requiring high-temperature treatment, thereby improving the electrochemical performance. The use of an inorganic MgF2 coating derived from a Mg salt has shown superior electrochemical performance for lithia-based cathodes compared to conventional electrolytes with or without a VC additive.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Sangjun Kim, Sanghyuk Park, Minsang Jo, Mincheol Beak, Jangho Park, Goojin Jeong, Ji-Sang Yu, Kyungjung Kwon
Summary: The study synthesized cathode active materials with varying Al content and examined the effects on physicochemical, thermal, and electrochemical properties. Results showed that increased Al content in the materials led to irregular particle shape and distribution, reduced initial charge/discharge capacity and cyclability, but improved rate capability. Residual Al was found to adversely affect capacity and cyclability, suggesting that trace amounts of Al in the materials can be tolerated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Hanwei Zhang, Xuri Wang, Ahmad Naveed, Tianyi Zeng, Xiaoyun Zhang, Hancheng Shi, Mingru Su, Aichun Dou, Yu Zhou, Yunjian Liu
Summary: Doping different cations can enhance the structural stability and electrochemical performance of nickel-rich cathode materials. The high valence Mg2+ doping provides a stronger bond, effectively suppressing undesired phase transitions. NCA with Mg doping exhibits better cycle stability and rate performance.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Mylene Hendrickx, Andreas Paulus, Maria A. Kirsanova, Marlies K. Van Bael, Artem M. Abakumov, An Hardy, Joke Hadermann
Summary: The morphology and nanostructure of cathode materials in lithium-ion batteries have a significant impact on their electrochemical performance. By selecting an appropriate synthesis strategy, the particle morphology and structure can be controlled, leading to improved battery performance.
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
Dongho Kim, Jaejin Hwang, Pilgyu Byeon, Wonsik Kim, Dong Gyu Kang, Hyung Bin Bae, Sang-Gil Lee, Seung Min Han, Jaekwang Lee, Sung-Yoon Chung
Summary: Since the recognition of the significant oxygen-redox contribution to Li transition-metal oxide cathodes' capacity enhancement, the issues of oxygen release, structural variations, and capacity fading have become critical for achieving better electrochemical performance. This study utilizes nanoindentation and surface polishing to investigate the local variations of atomic structure and oxygen content in LiCoO2 and Li2MnO3. The findings provide direct evidence of oxygen release due to lattice strain and suggest the importance of efficient strain relaxation for the longevity of the anion framework in layered oxide cathodes.
ADVANCED MATERIALS
(2023)