Synthesis of Graphene oxide@silicon Naocomposites and Its high-Performance as Lithium Ion Battery Anodes

被引:0
作者
Wang, Weiwei [1 ]
Tian, Meng [1 ]
Wu, Feng [1 ]
Li, Yujie [1 ]
机构
[1] Xuzhou Univ Technol, Sch Phys & New Energy, Xuzhou 221018, Jiangsu, Peoples R China
来源
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE | 2022年 / 17卷 / 08期
基金
中国国家自然科学基金;
关键词
Graphene oxide; GO@Si nanocomposite; Lithium Ion Batteries; Capacity retention; Cycling stability; FACILE SYNTHESIS; HIGH-CAPACITY; NANOSTRUCTURED SILICON; CROSS-LINKING; COMPOSITE; CARBON; NANOCOMPOSITES; BINDER; HYBRID; FILMS;
D O I
10.20964/2022.08.47
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The electrochemical characteristics of graphene oxide and Si nanocomposite (GO@Si) anode materials for lithium ion batteries were evaluated using chemo-thermal production. The structure and morphology of a GO@Si nanocomposite anode with 50% Si revealed that well-crystalline Si particles were uniformly enwrapped by graphene oxide nanosheets, forming the GO@Si nanocomposite's connection network. The first cycle discharge capacity increased from 1440 mA h/g for GO to 1471 mAh/g for Si and 1570 mAh/g for GO@Si nanocomposite at a current density of 0.5 A/g, indicating that the GO@Si nanocomposite performed better, which can be attributed to synergistic effects of the conductive GO nanosheets and the highly rough and porous structure of the nanocomposite. The conductive structure of the GO@Si nanocomposite electrode may effectively buffer the volume expansion-contraction during electrochemical cycling, according to the findings. After 300 electrochemical lithiation (discharge)/delithiation (charge) cycles, it was discovered that the GO@Si nanocomposite had excellent stability performance, with an effective capacity of 1018 mA h/g, which was roughly 3-fold that of a commercial graphite-based anode. The capacity retention of the GO@Si nanocomposite was 91% for the first 300 cycles, with a coulombic efficiency of 99.6%. The electrochemical performance of GO@Si nanocomposite containing 50% Si and different published anode materials for lithium ion batteries indicated that other anodes performed better or comparable. The rate capacity of the GO@Si nanocomposite indicated that at high current and fast rates, there was no structural degradation to the layer structure.
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页数:13
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