气氛条件对富锂型锂电池电极材料0.6Li_2MnO_3·0.4LiNi_(0.7)Mn_(0.3)O_2结构及电化学性能的影响  

Tunable Preparation of Li-excess Cathode Material 0.6Li_2MnO_3·0.4LiNi_(0.7)Mn_(0.3)O_2 and the Improved Electrochemical Performance

作　　者：马超[1,2] 刘聪[1,2] 王海鹰[1] 杨刚[1,2] 

机构地区：[1]常熟理工学院化学与材料工程学院,江苏常熟215500 [2]中国矿业大学材料科学与工程学院,江苏徐州221116

出　　处：《常熟理工学院学报》2017年第2期6-10,共5页Journal of Changshu Institute of Technology

基　　金：江苏省自然科学基金"高性能锂电池正极材料镍锰酸锂的合成及其电化学性能"(BK20141229)

摘　　要：通过反应过程中适量聚乙烯吡咯烷酮(PVP)作为反应助剂,控制自蔓延燃烧阶段的气氛条件,制备一系列富锂型锂电池正极材料.在充分氧气条件样品制备过程中添加PVP助剂的材料,其低倍率电流密度下的循环性较好,而对于未添加PVP助剂制备的样品,虽然首次容量偏低,但是其循环性能和倍率性能明显优于另外两个样品.本文从样品制备过程中添加适量PVP助剂和调控反应气氛等条件,控制了样品的结构与形貌,在一定程度上改善了所得富锂材料的电化学性能.A series of Li-excess cathode material 0.6Li2MnO3·0.4LiNi0.7Mn0.3O2 was synthesized by adding polyvi-nyl pyrrolidon（PVP） as reaction additive and controlling the atmosphere. Under enough oxygen consumption, theas-synthesized sample which is added to a proper amount of PVP in the relative precursor presents the best cy-clic stability as cathode operated at a very low current density. The sample synthesized in the air atmospherepresents a relative lower value in the initial cycle but it presents the best cyclic stability. Adding precursor addi-tive and controllable atmosphere can improve the crystal morphologies and the relative electrochemical proper-ties to some degree.

关 键 词：锂离子电池 正极材料 自蔓延燃烧 电化学性能 

分 类 号：TM242[一般工业技术—材料科学与工程]