Unlocking the decomposition limitations of the Li2C2O4 for highly efficient cathode preliathiations  

作　　者：Hongqiang Zhang Tiansheng Bai Jun Cheng Fengjun Ji Zhen Zeng Yuanyuan Li Chenwu Zhang Jiaxian Wang Weihao Xia Naixuan Ci Yixuan Guo Dandan Gao Wei Zhai Jingyu Lu Lijie Ci Deping Li 

机构地区：[1]State Key Laboratory of Advanced Welding and Joining,School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China [2]Department of Chemistry,Johannes Gutenberg University Mainz Duesbergweg 10-14,55128,Mainz,Germany [3]Department of Chemistry,City University of Hong Kong,Hong Kong,China [4]School of Science,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China

出　　处：《Advanced Powder Materials》2024年第5期58-68,共11页先进粉体材料（英文）

基　　金：supported by National Natural Science Foundation of China(Grant No.52002094);Guangdong Basic and Applied Basic Research Foundation(Grant No.2019A1515110756);Shenzhen Science and Technology Program(Grant No.JCYJ20210324121411031,JSGG202108021253804014,RCBS20210706092218040);the Shenzhen Steady Support Plan(GXWD20221030205923001,GXWD20201230155427003-20200824103000001);School Research Startup Expenses of Harbin Institute of Technology(Shenzhen)(Grant No.DD29100027,DD45001022).

摘　　要：The development of high-energy-density Li-ion batteries is hindered by the irreversible capacity loss during the initial charge-discharge process.Therefore,pre-lithiation technology has emerged in the past few decades as a powerful method to supplement the undesired lithium loss,thereby maximizing the energy utilization of LIBs and extending their cycle life.Lithium oxalate(Li_(2)C_(2)O_(4)),with a high lithium content and excellent air stability,has been considered one of the most promising materials for lithium compensation.However,the sluggish electrochemical decomposition kinetics of the material severely hinders its further commercial application.Here,we introduce a recrystallization strategy combined with atomic Ni catalysts to modulate the mass transport and decomposition reaction kinetics.The decomposition potential of Li_(2)C_(2)O_(4)is significantly decreased from~4.90V to~4.30V with a high compatibility with the current battery systems.In compared to the bare NCM//Li cell,the Ni/N-rGO and Li_(2)C_(2)O_(4)composite(Ni-LCO)modified cell releases an extra capacity of~11.7%.Moreover,this ratio can be magnified in the NCM//SiOx full cell,resulting in a 30.4%higher reversible capacity.Overall,this work brings the catalytic paradigm into the pre-lithiation technology,which opens another window for the development of high-energy-density battery systems.

关 键 词：High-energy-density batteries Pre-lithiation technologies Lithium oxalate(Li2C2O4) RECRYSTALLIZATION Single-atom catalyst 

分 类 号：TM9[电气工程—电力电子与电力传动]