Modification of Li_(3)PO_(4) layer effectively boosting lithium storage and thermal safety performance for LiCoO_(2) batteries  

作　　者：Weijun Zhang Caifang Qiu Zhongfeiyu Lin Guiying Zhao Yingying Liu Pengcheng Wang Yingbin Lin Zhigao Huang Jiaxin Li 

机构地区：[1]College of Physics and Energy,Fujian Provincial Solar Energy Conversion and Energy Storage Engineering Technology Research Center,Fujian Normal University,Fuzhou 350117,Fujian,China [2]Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering,Fuzhou 350117,Fujian,China [3]Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials,Fuzhou 350117,Fujian,China

出　　处：《Journal of Energy Chemistry》2024年第12期615-626,共12页能源化学（英文版）

基　　金：jointly supported by the Natural Science Foundations of China(No.22179020,12174057);Fujian Province’s“Young Eagle Program”Youth Top Talents Program。

摘　　要：To meet the demand for high-performance LiCoO_(2) batteries,it is necessary to overcome challenges such as interface degradation and rapid capacity degradation caused by changes in bulk structure,especially under deep delithiation and high temperature conditions.The ion conductive coating layer of Li_(3)PO_(4) has been directly modified on the surface of LiCoO_(2) particles using magnetron sputtering method,significantly improving the lithium storage performance of LiCoO_(2)@Li_(3)PO_(4) composites.Compared to pure LiCoO_(2),the modified LiCoO_(2) sample exhibits obviously better cycle life and high-temperature performance.Especially,under the conditions of 2 and 1 C,the LiCoO_(2)@Li_(3)PO_(4) electrode delivers excellent cycling performance at high voltage of 4.5 V,with capacity retention rates of 89.7%and 75.7%at room temperature and high temperature of 45℃,being far greater than those of 12.3%and 29.1%for bare LiCoO_(2) electrodes.It is discovered that the Li_(3)PO_(4) coating layer not only effectively enhances interface compatibility and suppresses the irreversible phase transition of LiCoO_(2),but also further improves the Li^(+)transport kinetics and significantly reduces battery polarization,ultimately enabling the modified LiCoO_(2) electrode to exhibit excellent lithium storage performance and thermal safety characteristics under high voltage conditions.Thus,such effective modified strategy can undoubtedly provide an important academic inspiration for LiCoO_(2) implication.

关 键 词：LiCoO_(2)cathode Li_(3)PO_(4)surface modification Electrochemical performance Pouch full battery Thermal safety performance 

分 类 号：TM912[电气工程—电力电子与电力传动] TB306[一般工业技术—材料科学与工程]