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尖晶石锰酸锂纳米粒子的制备及其电化学性能研究.pdf

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20 11 39 12 ·79 · 年 卷第 期 广州化工 尖晶石锰酸锂纳米粒子的制备及其电化学性能研究 , , , 陈 亚 王佳伟 陈白珍 范瑞娟 ( , 4 10083) 中南大学冶金科学与工程学院 湖南 长沙 摘 要: 。 , 采用一种溶胶凝胶法制备尖晶石锰酸锂纳米粒子并对其恒电流充放电和交流阻抗特性进行了研究 结果表明 所制 133 mAg / g , 5 10% 。 备的锰酸锂材料首次放电容量达到 但经过 次充放电循环后容量的衰减率超过 容量衰减比较快的原因可能是由 , 。 于所制备的纳米尖晶石锰酸锂材料表面积大 其与电解液的反应也比较快 : 关键词 LiMn O ; ; ; ; 2 4 尖晶石锰酸锂 锂离子电池 正极材料 溶胶凝胶法 Preparation and Electrochemical Properties of LiMn O Nanoparticles 2 4 CHEN Ya ,WANG Jia - wei ,CHEN Bai - zhen ,FAN Rui -j uan (School of Metallurgical Science and Engineering ,Central South University ,Hunan Changsha 4 10083 ,China) Abstract :LiMn O nanoparticles were prepared by a sol - gel method and evaluated by galvanostatic charge - dis- 2 4 charge and electrochemical impedance spectra. The results showed that the obtained material had high initial discharge ca- pacity which reached up to 133 mAh / g ,but cycling performance of the material was found to be bad. The discharge ca- pacity retention was less than 90% during the investigated 5 charge - discharge cycles. It was postulated that the capacity loss was mainly attributed to the large specific surface area of the nano - particle material. Key words :LiMn O ;spinel lithium manganese oxide ;lithium ion bat
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