Recycle spent graphite to defect-engineered,high-power graphite anode  

作　　者：Jiawei Luo Jingchao Zhang Zhaoxin Guo Zhedong Liu Shuming Dou Wei-Di Liu Yanan Chen Wenbin Hu 

机构地区：[1]School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China [2]Australian Institute for Bioengineering and Nanotechnology,The University of Queensland,St Lucia,QLD 4072,Australia

出　　处：《Nano Research》2023年第4期4240-4245,共6页纳米研究（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(Nos.52171219 and 91963113).

摘　　要：Graphite is a dominant anode material for lithium-ion batteries(LIBs)due to its outstanding electrochemical performance.However,slow lithium ion(Li+)kinetics of graphite anode restricts its further application.Herein,we report that high-temperature shock(HTS)can drive spent graphite(SG)into defect-rich recycled graphite(DRG)which is ideal for high-rate anode.The DRG exhibits the charging specific capacity of 323 mAh/g at a high current density of 2 C,which outperforms commercial graphite(CG,120 mAh/g).The eminent electrochemical performance of DRG can be attributed to the recovery of layered structure and partial remaining defects of SG during ultrafast heating and cooling process,which can effectively reduce total strain energy,accelerate the phase transition in thermodynamics and improve the Li+diffusion.This study provides a facile strategy to guide the re-graphitization of SG and design high performance battery electrode materials by defect engineering from the atomic level.

关 键 词：ULTRAFAST recycling defect-rich graphite anode high-temperature shock 

分 类 号：TQ127.11[化学工程—无机化工] X705[环境科学与工程—环境工程]