石墨烯包覆富锂层状材料的制备及其电化学性能

doi:10.13208/j.electrochem.141053

电化学（中英文） ›› 2015, Vol. 21 ›› Issue (3): 195-200. doi: 10.13208/j.electrochem.141053

• 化学电源及其材料近期研究专辑（客座编辑：复旦大学夏永姚教授） • 下一篇

石墨烯包覆富锂层状材料的制备及其电化学性能

侯孟炎，王珂，董晓丽，夏永姚^*

复旦大学化学系，上海 200433

收稿日期:2014-11-27 修回日期:2015-03-26 出版日期:2015-06-28 发布日期:2015-06-28
通讯作者: 夏永姚 E-mail:yyxia@fudan.edu.cn
基金资助:
国家重大研究计划纳米专项项目（No. 2011CB935903）资助

Synthesis of Graphene Wrapped Li-rich Layered metal Oxide and its Electrochemical Performance

HOU Meng-yan, WANG Ke, DONG Xiao-li, XIA Yong-yao^*

Department of Chemistry, Fudan University, Shanghai 200433, China

Received:2014-11-27 Revised:2015-03-26 Published:2015-06-28 Online:2015-06-28
Contact: XIA Yong-yao E-mail:yyxia@fudan.edu.cn

摘要/Abstract

摘要： 应用共沉淀结合固相烧结合成了富锂层状氧化物（Li-rich layered oxide，LLO）Li_1.2Ni_0.13Co_0.13Mn_0.54O₂. 对制备的富锂材料用氧化石墨烯（Graphene Oxide，GO）包覆后，再经300 ^oC空气中煅烧，制备了石墨烯（Graphene，Gra）卷绕包覆的复合材料（LLO/Gra）. 使用扫描电镜（SEM）、透射电镜（TEM）、X射线衍射（XRD）和X射线光电子能谱（XPS）及电化学方法表征所得样品. 结果表明，富锂层状氧化物均匀地卷绕在石墨烯中. 与原始富锂材料相比，石墨烯包覆后的复合材料表现出更加优异的电化学性能. 尤其是石墨烯卷绕可以改善富锂材料的导电性，提高材料的放电倍率性能，在2.0至4.8 V电压范围内，0.1C（20 mA·g^-1）电流充放电下，容量达270 mAh·g^-1，1C倍率下复合物的放电容量接近200 mAh·g^-1，比原始LLO材料170 mAh·g^-1提高了15%.

关键词: 富锂层状氧化物, 石墨烯, 正极材料, 锂离子电池, 碳包覆

Abstract: In present work, lithium-rich layered transition metal oxide (LLO) was synthesized by a co-precipitation method in combination with a solid-state reaction. The graphene wrapped Li-rich layered oxide composite (LLO/Gra) was obtained by sintering the LLO/GO composite at 300 ^oC for 30 min in an air. The morphologies and the electrochemical performances were characterized by means of SEM, TEM, XRD, XPS, EIS and charge/discharge tests. The results indicated that the LLOe particles were uniformly wrapped with graphene. The resulting material exhibited better rate capability than that of pristine LLO since the wrapped graphene demonstrated the enhanced electronic conductivity. Accordingly, the capacity of 270 mAh·g^-1 for the LLO/Gra composite could be obtained in a range of 2.0 to 4.8 V at 0.1C (20 mA·g^-1), while approached to 200 mAh·g^-1 at 1C, which is 15% higher than that of pristine LLO (170 mAh·g^-1).

Key words: layered Li-rich metal oxide, graphene, cathode material, lithium ion battery, carbon coating

中图分类号:

O646

侯孟炎, 王珂, 董晓丽, 夏永姚. 石墨烯包覆富锂层状材料的制备及其电化学性能[J]. 电化学（中英文）, 2015, 21(3): 195-200.

HOU Meng-yan, WANG Ke, DONG Xiao-li, XIA Yong-yao. Synthesis of Graphene Wrapped Li-rich Layered metal Oxide and its Electrochemical Performance[J]. Journal of Electrochemistry, 2015, 21(3): 195-200.

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石墨烯包覆富锂层状材料的制备及其电化学性能

Synthesis of Graphene Wrapped Li-rich Layered metal Oxide and its Electrochemical Performance

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