溶胶-凝胶法制备富锂锰基材料  

Preparation of lithium-rich manganese-based materials by sol-gel method

作　　者：陈垒 樊俊豪 马翠环 崔海滨 CHEN Lei;FAN Jun-hao;MA Cui-huan;CUI Hai-bin(College of Materials and Chemical Engineering,Henan University of Engineering,Zhengzhou 450007,China)

机构地区：[1]河南工程学院材料与化学工程学院,河南郑州450007

出　　处：《现代化工》2020年第4期143-147,共5页Modern Chemical Industry

基　　金：河南省高等学校重点科研项目计划(16A530005)。

摘　　要：以乙酸盐为原料、柠檬酸为螯合剂,氨水调节pH,采用溶胶-凝胶法制备高容量的富锂锰基材料,并考察了滴加速度、压片处理和掺铌改性对富锂锰基材料性能的影响。通过X射线衍射和激光颗粒粒度分析表征了材料的晶体结构和颗粒组成,并制备纽扣电池,测试了材料的电化学性能。X射线衍射测试结果表明,材料具有完整的富锂锰基材料的晶体结构。压片处理和减慢滴加速度的材料首次放电容量为210 mA·h/g左右,而掺铌改性材料的首次放电容量是250 mA·h/g左右。压片处理和掺铌改性的材料在大电流下容量有所提高。通过优化合成富锂锰基材料的实验条件,为材料的量产提供了理论依据和工艺参数支持。A kind of high-capacity lithium-rich manganese-based material is prepared through sol-gel method by using acetate as raw material,citric acid as chelating agent,and ammonia solution for p H adjustment. The effects of titrating speed,tabletting treatment and niobium-doped modification on the properties of lithium-rich manganese-based materials are investigated. Crystal structure and particle composition of the materials are characterized by X-ray diffraction,scanning electron microscopy and laser particle size analysis.A button cell is made from the materials to test the electrochemical properties.X-ray diffraction measurements indicate the materials have a complete crystal structure of lithium-rich manganese-based materials. The first discharge capacity of the materials that are made by tabletting and slowing titration speed is around 210 m A·h·g-1,while that of the niobium-doped modified materials is about 250 m A·h·g-1.The capacity of both tabletted and niobium-doped materials has some improvement under large current.By optimizing the synthesis conditions for lithium-rich manganese-based materials,it provides theoretical basis and process parameter support for mass production of materials.

关 键 词：锂离子电池 富锂锰基材料 充放电容量 滴定速度 掺铌改性 

分 类 号：TM912.9[电气工程—电力电子与电力传动]