Self-assembled Li3V2(PO4)3/reduced graphene oxide multilayer composite prepared by sequential adsorption

JOURNAL OF POWER SOURCES

卷:367

Article

Kim, Myeong-Seong¹  Bak, Seong-Min²  Lee, Suk-Woo¹  Cho, Byung-Won³  Roh, Kwang Chul⁴  Kim, Kwang-Bum¹ 

[1] Yonsei Univ, Dept Mat Sci & Engn, 134 Shinchon Dong, Seoul 120749, South Korea

[2] Brookhaven Natl Lab, Div Chem, Upton, NY 11973 USA

[3] Korea Inst Sci & Technol, Ctr Energy Convergence Res, Hwarangno 14 Gil 5, Seoul 136791, South Korea

[4] Korea Inst Ceram Engn Technol, Energy Mat Ctr, Energy & Environm Div, 101 Soho Ro, Jinju Si 660031, Gyeongsangnam D, South Korea

关键词: Multilayer structure;    Graphene-based 3D assembly;    Sequential adsorption method;    High-rate lithium-ion batteries;    Energy efficiency;   

DOI  :  10.1016/j.jpowsour.2017.09.057

来源: Elsevier

【 摘 要 】

Herein, we report on Li3V2(PO4)(3) (LVP)/reduced graphene oxide (rGO) multilayer composites prepared via a sequential adsorption method and subsequent heat treatment, and their use as cathodes for high rate lithium-ion batteries. The sequential adsorption process includes adsorbing oppositely charged components of anionic inorganic species and cationic head of a surfactant adsorbed to graphite oxide sheets, which is a key step in the fabrication of the LVP/rGO multilayer composites. The multilayer structure has open channels between the highly conductive rGO layers while achieving a relatively high tap density, which could effectively improve the rate capability. Consequently, the LVP/rGO multilayer composites exhibit a high tap density (0.6 g cm(-3)) and good electrochemical properties. Specifically, in the voltage range of 3.0-4.3 V, the composite exhibits a specific capacity of 131 mAh g(-1) at 0.1C, a good rate capabilities (88% capacity retention at 60C), and long cycling performance (97% capacity retention after 500 cycles at 10C). Moreover, in the extended voltage range of 3.0-4.8 V, it exhibits a high specific capacity of 185 mAh g(-1) at 0.2C, a good rate capability (66% capacity retention at 30C), and stable cycling performance (96% capacity retention after 500 cycles at 10C). (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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