LiCoO 2 for cathode of lithium ion battery has been prepared by evaporating a mixture solution of Li 2CO 3 and Co(CH 3COO) 2·4H 2O in molar ratio of 12 and sintering at different temperatures. The XRD, SEM and ...LiCoO 2 for cathode of lithium ion battery has been prepared by evaporating a mixture solution of Li 2CO 3 and Co(CH 3COO) 2·4H 2O in molar ratio of 12 and sintering at different temperatures. The XRD, SEM and electrochemical measurements showed that the product obtained from sintering at 800 ℃ for 6 hours has regular spheroid distribution, small size and the best electrochemical property.展开更多
采用改性Hummers法制备了氧化石墨烯和通过化学还原法还原氧化石墨制得石墨烯,及以石墨烯作为正极材料LiCoO2的导电剂,并研究它们对锂离子电池电化学性能的影响。扫描电镜(SEM)和透射电镜(TEM)结果表明,石墨烯的表面褶皱使其能有效地包...采用改性Hummers法制备了氧化石墨烯和通过化学还原法还原氧化石墨制得石墨烯,及以石墨烯作为正极材料LiCoO2的导电剂,并研究它们对锂离子电池电化学性能的影响。扫描电镜(SEM)和透射电镜(TEM)结果表明,石墨烯的表面褶皱使其能有效地包裹LiCoO2颗粒,形成面接触的导电界面,从而显著提高了导电性。充放电实验表明,石墨烯的加入有利于提高LiCoO2的电化学反应活性、放电容量和高倍率循环性能。相对于传统的炭黑,LiCoO2的放电容量在0.2 C下提高了10 m Ah/g。石墨烯/LiCoO2电池在1C倍率下,循环300次后,放电容量由145.0 m Ah/g衰减到137.8 m Ah/g,放电容量能保持初始容量的95.1%。石墨烯/LiCoO2电池在20 C倍率下的放电容量达到132.1 m Ah/g,是1 C放电容量的91.1%。展开更多
文摘LiCoO 2 for cathode of lithium ion battery has been prepared by evaporating a mixture solution of Li 2CO 3 and Co(CH 3COO) 2·4H 2O in molar ratio of 12 and sintering at different temperatures. The XRD, SEM and electrochemical measurements showed that the product obtained from sintering at 800 ℃ for 6 hours has regular spheroid distribution, small size and the best electrochemical property.
文摘采用改性Hummers法制备了氧化石墨烯和通过化学还原法还原氧化石墨制得石墨烯,及以石墨烯作为正极材料LiCoO2的导电剂,并研究它们对锂离子电池电化学性能的影响。扫描电镜(SEM)和透射电镜(TEM)结果表明,石墨烯的表面褶皱使其能有效地包裹LiCoO2颗粒,形成面接触的导电界面,从而显著提高了导电性。充放电实验表明,石墨烯的加入有利于提高LiCoO2的电化学反应活性、放电容量和高倍率循环性能。相对于传统的炭黑,LiCoO2的放电容量在0.2 C下提高了10 m Ah/g。石墨烯/LiCoO2电池在1C倍率下,循环300次后,放电容量由145.0 m Ah/g衰减到137.8 m Ah/g,放电容量能保持初始容量的95.1%。石墨烯/LiCoO2电池在20 C倍率下的放电容量达到132.1 m Ah/g,是1 C放电容量的91.1%。
