Yulin Zhang, Helang Huang, Xuanning Chen, Tian Gao, Junhui Li, Yao Yao*, Zhenming Xu, Mingbo Zheng* and Zhenhui Liu*,
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引用次数: 0
Abstract
Graphite-silicon composite anodes have been regarded as some of the most practical next-generation anode materials for commercialization. However, poor interfacial contact between Si and graphite and serious volume expansion of Si always lead to even worse electrochemical performances than the pure graphite anode. Herein, we report a stable graphite-SiOx/C composite anode (Gr@SiOx/C) with a homogeneous SiOx/C coating layer on the surface of graphite via a facile sol–gel process and subsequent pyrolysis. SiOx/C can enhance the overall capacity of the composite anode while possessing a low volume expansion, which is beneficial to maintaining structural stability. Furthermore, the homogeneous distribution of SiOx and C frameworks also enables rapid and stable Li+/electron transport toward the graphite inner core. As a result, the as-prepared Gr@SiOx/C composite anode exhibits excellent cycling stability and rate capability with more than twice the capacity of graphite at 1 A g–1. A full cell assembled with NCM811 cathode delivers a high stable cycling performance with a capacity retention exceeding 90% after 300 cycles and an average Coulomb efficiency of 99.24%. This work is expected to provide a reference for the rational design of graphite-silicon composite anodes in lithium-ion batteries.
石墨硅复合阳极已被认为是一些最实用的商业化的下一代阳极材料。然而,硅与石墨的界面接触不良以及硅的体积膨胀严重,往往导致其电化学性能比纯石墨阳极更差。在此,我们报道了一个稳定的石墨-SiOx/C复合阳极(Gr@SiOx/C),石墨表面有均匀的SiOx/C涂层,通过简单的溶胶-凝胶过程和随后的热解。SiOx/C可以提高复合阳极的整体容量,同时具有较小的体积膨胀,有利于保持结构的稳定性。此外,SiOx和C框架的均匀分布也使得Li+/电子能够快速稳定地向石墨内芯传输。结果表明,制备的Gr@SiOx/C复合阳极表现出优异的循环稳定性和速率能力,在1 a g-1下的容量是石墨的两倍以上。用NCM811阴极组装的完整电池具有高稳定的循环性能,300次循环后容量保持率超过90%,平均库仑效率达到99.24%。该工作有望为锂离子电池中石墨硅复合阳极的合理设计提供参考。
期刊介绍:
Energy & Fuels publishes reports of research in the technical area defined by the intersection of the disciplines of chemistry and chemical engineering and the application domain of non-nuclear energy and fuels. This includes research directed at the formation of, exploration for, and production of fossil fuels and biomass; the properties and structure or molecular composition of both raw fuels and refined products; the chemistry involved in the processing and utilization of fuels; fuel cells and their applications; and the analytical and instrumental techniques used in investigations of the foregoing areas.