Encapsulating porous SnO2 into a hybrid nanocarbon matrix for long lifetime Li storage
Encapsulating porous SnO2 into a hybrid nanocarbon matrix for long lifetime Li storage
复制标题
将多孔 SnO2 封装到混合纳米碳基质中以实现长寿命锂存储
DOI：
10.1039/c7ta09544a
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发表时间：
2017
影响因子：
11.9
通讯作者：
Zhichuan J. Xu
中科院分区：
文献类型：
--
作者：
Yi Zhao;Luyuan Paul Wang;Shibo Xi;Yonghua Du;Qianqian Yao;Lunhui Guan;Zhichuan J. Xu
为了克服金属氧化物电极的电导率低和体积变化大的缺点，针对这些金属氧化物的电极微结构设计似乎是实现理想的锂存储性能的最有前途的策略。在这篇文章中，我们报道了一种合理的碳/SnO2微结构的设计，在这种微结构中，多孔SnO2纳米颗粒被包裹在石墨烯基质中和额外的碳涂层中。作为LiBS的负极材料，所制备的G@p-SnO2@C复合材料具有长达1800次的超长循环寿命。经1000次和1800次循环后，1.5A g−1的比容量分别为602和418 mA h g−1。优异的电池性能可以归功于这种复合材料独特的结构，它提高了导电性，提供了足够的内部空隙空间来容纳SnO2的体积变化，减少了团聚，并在循环过程中保持了电极的完整性。
To overcome the low conductivity and large volume variation of metal oxide anodes, the electrode microstructure design for these metal oxides appeared to be the most promising strategy for achieving the desired Li storage performance. In this article, we report on a rational design of the carbon/SnO2 microstructure, in which porous SnO2 nanoparticles are encapsulated into the graphene matrix and additional carbon coating layer. As an anode material for LIBs, the as-prepared G@p-SnO2@C composite exhibited an ultra-long cycling life up to 1800 cycles. It can sustain high specific capacities of 602 and 418 mA h g−1 at 1.5 A g−1 after 1000 and 1800 cycles, respectively. The excellent battery performance could be attributed to the unique architecture of this composite, which enhances electrical conductivity, provides sufficient interior void space to accommodate the volume variation of SnO2, mitigates the aggregation, and preserves the integrity of electrodes during cycling.