Liquid metal welding enabling high loading binder/carbon-free layered oxide cathode toward high-performance liquid and solid-state battery  

作　　者：Xiang Han Lan-Hui Gu Min Xu Min-Feng Chen Ji-Zhang Chen 

机构地区：[1]College of Materials Science and Engineering,Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing Forestry University,Nanjing,210037,China

出　　处：《Rare Metals》2023年第5期1583-1593,共11页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.22209075,51902165);the Natural Science Foundation of Jiangsu Province(No.BK20200800)。

摘　　要：High loading cathode with high active material proportion is a practical demand but far below the desirable value to achieve high energy density lithium-ion batteries(LIBs).Normally,the Li^(+)/electron transport between active materials and electrolyte/c arbon,however,it is poor and areal resistance is extremely high for a high loading/thick cathode.In this manuscript,taking high-voltage lithium cobalt oxide LiCoO_(2)(LCO)as an example,we design a facile liquid metal welding method enabled by a low melting-point indium-tin oxide In_(2)O_(3)/SnO_(2)(ITO)during a thermal treatment process,the strongly adhesion active particles show robust mechanical property for the free-standing LCO cathode with a pellet architecture.We also demonstrate that the O_(2)atmosphere plays a critical role on the interfacial property,that is preventing the layered structure to rock-salt Co_(3)O_(4)as well as further enhancing the interfacial mechanical integration.As expected,the LCO-ITO free-standing cathode not only shows robust mechanical property with densely packed configuration but also provides a fast Li^(+)/electron pathway at the interface.Consequently,the LCO-ITO composite cathode exhibits excellent electrochemical cycling performance in both liquid and solid-state cells.For example,even at a high active material mass of 56 mg·cm^(-2),the LCO cathode still delivers a specific capacity of 151 mAh·g^(-1)and maintains132.5 mAh·g^(-1)(corresponding to 7.4 mAh·cm^(-2))after 80cycles.The LCO-ITO-O_(2)cathode is also applicable to a solidstate cell,which exhibits a high capacity of 100.4 mAh·g^(-1)after 200 cycles of long-term cycling.The excellent electrochemical of the LCO-ITO-O_(2)reveals the successful engineering mechanical architecture and interfacial carriers transport,which may be expected as an alternative approach to achieve high energy density LIBs.

关 键 词：Lithium-ion battery(LIB) High loading cathode Liquid metal welding Mechanical property Interfacial carriers transport 

分 类 号：TM912[电气工程—电力电子与电力传动]