Preparation of reduced graphene oxide by microwave method and its application in lithium-sulfur batteries

doi:10.11949/j.issn.0438-1157.20170324

Abstract

Abstract:

Oxidized graphite (GO) prepared by modified Hummer's method was immersed in carbonic acid, and consequently stripped to a low grained reduced graphene oxide by microwave solid phase method. This method has simplicity for operator, energy efficiency and time saving, in which experimental conditions are mild with free of toxic strong reducer. As cathode composites for lithium-sulfur battery, reduced graphene oxide/nano-sulfur (MRGO/NS) were prepared by in-situ precipitation reaction at low temperature. The crystal structure and morphology of the MRGO and MRGO/NS composites were characterized by FT-IR, XRD, SEM, TEM and BET, respectively. The electrochemical performance of the composites was determined by galvanostatic charge-discharge test and impedance spectroscopy. The results show that the MRGO obtained from GO immersed in carbonic acid and stripped by microwave solid phase method is folding fan-like graphene, which can provide space to accommodate the active materials for lithium-sulfur batteries, and alleviate the shuttle effect to improve the cycle performance and the C-rate performance of the electrode material.

Key words: reduced graphene oxide, microwave method, nano-sulfur, composites, lithium-sulfur batteries

摘要：

采用改进的Hummers法制备了氧化石墨（GO），对GO进行碳酸浸渍后，通过微波固相法剥离其为少层的还原氧化石墨烯（MRGO）。并采用低温原位化学沉积法制备微波还原氧化石墨烯/纳米硫（MRGO/NS）锂硫电池正极复合材料。通过FT-IR、XRD、SEM、TEM、BET对所制备的MRGO和MRGO/NS的微观结构、形貌等进行表征，采用恒流充放电测试和交流阻抗测试对复合材料的电化学性能进行研究。结果表明，通过微波固相法剥离碳酸浸渍后的GO所制备的MRGO为少层的折扇状还原氧化石墨烯，可为锂硫电池的硫和多硫化物提供足够的容纳空间，从而缓解穿梭效应，提高了电极材料的循环性能和倍率性能。

关键词: 还原氧化石墨烯, 微波法, 纳米硫, 复合材料, 锂硫电池

CLC Number:

O646

YANG Rong, LI Lan, WANG Liqing, FU Xin, YAN Yinglin, CHEN Liping, LU Leilei. Preparation of reduced graphene oxide by microwave method and its application in lithium-sulfur batteries[J]. CIESC Journal, 2017, 68(11): 4333-4340.

杨蓉, 李兰, 王黎晴, 付欣, 燕映霖, 陈利萍, 路蕾蕾. 微波法制备还原氧化石墨烯及其在锂硫电池中的应用[J]. 化工学报, 2017, 68(11): 4333-4340.

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