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

Authors

Meng-yan HOU, Department of Chemistry, Fudan University, Shanghai 200433, China;
Ke WANG, Department of Chemistry, Fudan University, Shanghai 200433, China;
Xiao-li DONG, Department of Chemistry, Fudan University, Shanghai 200433, China;
Yong-yao XIA, Department of Chemistry, Fudan University, Shanghai 200433, China;Follow

Corresponding Author

Yong-yao XIA(yyxia@fudan.edu.cn)

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).

Graphical Abstract

Keywords

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

DOI Link

https://doi.org/10.13208/j.electrochem.141053

Publication Date

2015-06-28

Online Available Date

2015-06-28

Revised Date

2015-03-26

Received Date

2014-11-27

Recommended Citation

Meng-yan HOU, Ke WANG, Xiao-li DONG, Yong-yao XIA. Synthesis of Graphene Wrapped Li-rich Layered metal Oxide and its Electrochemical Performance[J]. Journal of Electrochemistry, 2015 , 21(3): 195-200.
DOI: 10.13208/j.electrochem.141053
Available at: https://jelectrochem.xmu.edu.cn/journal/vol21/iss3/1