3D graphene aerogel framework enwrapped LiFePO4 submicron-rods with improved lithium storage performance

JOURNAL OF ALLOYS AND COMPOUNDS

卷:810

Article

Tian, Xiaohui¹  Chen, Zhonghua²  Zhu, Yanbin¹  Huang, Xiao¹  Wu, Guan¹  Zhou, Yingke¹ 

[1] Wuhan Univ Sci & Technol, Coll Mat & Met, Inst Adv Mat & Nano Technol, State Key Lab Refractories & Met, Wuhan 430081, Hubei, Peoples R China

[2] Norut Northern Res Inst Narvik AS, Rombaksveien 47, N-8517 Narvik, Norway

关键词: LiFePO4 submicron-rod;    Graphene aerogel;    Solvothermal method;    Cathode;    Li-ion battery;   

DOI  :  10.1016/j.jallcom.2019.151913

来源: Elsevier

【 摘 要 】

The three-dimensional (3D) graphene aerogel (GA)-wrapped LiFePO4 submicron-rod composite (LFP@GA) has been prepared successfully through a solvothermal method followed with rapid freeze-drying. Monodispersed LiFePO4 submicron-rods are well-enwrapped with the graphene sheets and which further form a highly porous and conductive 3D structure, leading to the overall rapid electron transport of the composite electrode and affording many interwoven pores for fast supply of Li+ and storage of electrolyte. Moreover, the combination of the rod-shaped LFP and porous 3D structure can effectively relieve the stress resulted from the structural change during the insertion/deinsertion of Li+. Owing to these particular structure and characteristics, the LFP@GA composite presents a high discharge capacity (162.7 mAh g(-1) at 0.1 C), a remarkable rate capacity (119.9 mAh g(-1) at 5 C) and an excellent long-term cycle stability after 1000 cycles at 1 C (86.5% capacity retention), which is potential for use in Li-ion batteries. (C) 2019 Elsevier B.V. All rights reserved.

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