Recycling dihydrate iron phosphate from waste batteries and regenerating LiFePO4/C
Dihydrate iron phosphate was recovered from waste lithium iron phosphate batteries using acid leaching heating reflux method.It was used as a raw material to regenerate LiFePO4/C cathode material by adding a certain amount of lithium source and carbon source through high-temperature solid-phase method.The influence of temperature as the main influen-cing factor on the electrochemical performance of regenerated LiFePO4/C was investigated.In the main process of recycling,the waste lithium iron phosphate cathode plate is first subjected to acid leaching heating reflux treatment to generate FePO4·2H2O.After washing and drying,FePO4·2H2O powder is obtained by grinding.XRD characterization and ICP tes-ting results show that the recovered FePO4·2H2O has a complete structure and high purity.Then,FePO4·2H2O powder was used as the raw material and carbon source was added to prepare LiFePO4/C material at high temperature.The structure and morphology of the material were characterized,and electrochemical tests were conducted.It was found that the LiFePO4/C regenerated with glucose as the carbon source,temperature of 700℃,and glucose content as 17％of the theoretical lithi-um iron phosphate mass had the best electrochemical performance.At a rate of 0.3C,the first week discharge specific ca-pacity can reach 141.8 mAh/g,and the capacity retention rate can be maintained at 94.3％after 100 cycles.By comparing the electrochemical performance with commercial LiFePO4/C,it was further verified that the regenerated LiFePO4/C pro-duced by this process has excellent electrochemical performance.
waste lithium iron phosphate batteriesFePO4·2H2Ohigh temperature solid-phase methodregenerated LiFe-PO4/C
国家科技期刊平台
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