Template-free preparation of porous Co microfibers from spent lithium-ion batteries as a promising microwave absorber  

作　　者：Xiao-Min Wu Fei Xie Yong-Lin Yao Yue Sun Zhong-Sheng Hua Zhuo Zhao Yong-Xiang Yang 

机构地区：[1]Anhui Province Key Laboratory of Metallurgical Engineering&Resources Recycling,School of Metallurgical Engineering,Anhui University of Technology,Maanshan,243002,China [2]Department of Materials Science and Engineering,Delft University of Technology,Delft,2628CD,Netherlands

出　　处：《Rare Metals》2022年第10期3475-3485,共11页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos.51604005 and U1703130);the Universities Natural Science Research Project of Education Department of Anhui Province (No.KJ2020A0224);the Open Fund of Anhui Province Key Laboratory of Metallurgical Engineering & Resources Recycling (No.SKF19-01)。

摘　　要：In order to take full advantage of the secondary resources,in this paper,we reported a template-free process to prepare porous Co microfibers from spent lithiumion batteries(LIBs).First,the waste LiCoO_(2) powders were leached by oxalic acid at a suitable temperature,and rodlike cobalt oxalate powders were obtained.Second,the porous Co microfibers were prepared by using the cobalt oxalate as precursors through a thermal decomposition at420 ℃ under nitrogen atmosphere.The prepared Co microfibers possess diameters of 1-2 μm,and each microfiber consists of small particles with size of100-200 nm.The Co microfibers(25 wt%)/paraffin composite exhibited excellent microwave absorption performance.When the sample thickness is 4.5 mm,the reflection losses reach-36.14 and-38.20 dB at 4.16 and 17.60 GHz,respectively,and the effective bandwidth reaches up to 5.52 GHz.This indicates that the Co microfibers can be used as a promising microwave absorber.Therefore,this paper demonstrates a novel process to make a high value-added product through recycling from the spent lithium-ion batteries.In addition,it is advantageous to eliminate the hazard of spent lithium-ion batteries and electromagnetic radiation to environment and human health.

关 键 词：Spent lithium-ion batteries(LIBs) Co microfibers RECYCLING Oxalic acid leaching Microwave absorption 

分 类 号：X705[环境科学与工程—环境工程] TQ342[化学工程—化纤工业]