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合成气氛对LiNi_0.75Co_0.25O₂性能的影响

Influence of sintering atmosphere on the performance of LiNi_0.75Co_0.25O₂ cathode materials for lithium ion batteries

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【Author】 HE Hui1, CHENG Xuan2, ZHANG Ying1, YANG Yong3(1.Department of Materials Science and Engineering, Xiamen University, Xiamen Fujian 361005, China; 2.Department of Chemistry, Xiamen University, Xiamen Fujian 361005, China; 3.State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen Fujian 361005, China)

【机构】厦门大学材料科学与工程系；厦门大学化学系；厦门大学固体表面物理化学国家重点实验室福建厦门361005；福建厦门361005；福建厦门361005；

【摘要】利用溶胶-凝胶方法分别在氧气和空气气氛下合成了锂离子蓄电池正极材料LiNi0.75Co0.25O2,并对该材料进行了XRD分析、Rieveld结构精修以及电化学测试,初步探讨了合成气氛对LiNi0.75Co0.25O2结构及其电化学性能的影响。结果证实,当采用溶胶-凝胶预处理固相合成方法时,在氧气气氛下合成的锂离子蓄电池正极材料LiNi0.75Co0.25O2的电化学性能要好于在空气中合成的LiNi0.75Co0.25O2,并通过对该材料进行Rieveld结构精修进一步解释了该现象。更多还原

【Abstract】 The cathode materials, LiNi0.75Co0.25O2, for lithium ion batteries were synthesized at oxygen and air atmospheres, respectively, by sol-gel method. The materials were studied by powder X-ray diffraction (XRD), analyzed by Rietveld structure refinement method and examined by performing electrochemical charge-discharge measurements. The effects of sintering atmosphere on the structure and electrochemical properties of LiNi0.75Co0.25O2 were discussed based on the experimental results. It was confirmed that the electrochemical performance of LiNi0.75Co0.25O2 prepared at O2 atmosphere was better than that of which at air atmosphere. Further interpretation in the influence of atmosphere was provided by carrying out the Rietveld structure refinement analysis.更多还原