Abstract

A lithium-rich cathode material for lithium-ion batteries, Li_1.2Ni_0.133Mn_0.534Co_0.133O₂, was synthesized by three methods. Cathode materials based on this compound in which cobalt was partially replaced by cadmium were obtained. The effects of preparation method and cadmium introduction method on the electrochemical characteristics of the materials were investigated. The oxides were obtained by co-precipitation in which cadmium was added either in the precursor preparation stage or in the stage of solid-state reaction of the precursor with the lithium source, or in the solvothermal synthesis. The presence of cadmium in the materials was proved by inductively coupled plasma mass spectrometry, powder X-ray diffraction, and electron probe microanalysis. The most part of cadmium in the modified materials existed as an oxide coating on the surface of the active material particles. The electrochemical testing of the materials in half-cells with a lithium anode showed that the sample with a more uniform coating obtained by adding cadmium during the precursor synthesis had better electrochemical characteristics than the pristine material (95% versus 84% reversibility by the 100th cycle).

中文翻译：

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富锂正极材料Li1.2Ni0.133Mn0.534Co0.133O2的镉改性

摘要

采用三种方法合成了锂离子电池富锂正极材料Li _1.2 Ni _0.133 Mn _0.534 Co _0.133 O _{2 。}获得了基于这种化合物的阴极材料，其中钴被镉部分取代。考察了制备方法和镉引入方法对材料电化学特性的影响。氧化物是通过在前体制备阶段或在前体与锂源的固态反应阶段或在溶剂热合成中添加镉的共沉淀获得的。通过电感耦合等离子体质谱、粉末X射线衍射和电子探针显微分析证明了材料中镉的存在。改性材料中的大部分镉以氧化物涂层的形式存在于活性材料颗粒的表面。