Uniform coaxial CNT@Li2MnSiO4@C as advanced cathode material for lithium-ion battery
Uniform coaxial CNT@Li2MnSiO4@C as advanced cathode material for lithium-ion battery
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均匀同轴CNT@Li2MnSiO4@C作为先进锂离子电池正极材料
DOI：
10.1016/j.electacta.2018.08.143
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发表时间：
2018-11-20
影响因子：
6.6
通讯作者：
Luo, Yongsong
中科院分区：
文献类型：
--
作者：
Peng, Tao;Guo, Wei;Luo, Yongsong
纳米结构的合理设计对于克服Li 2 MnSiO 4正极材料的固有缺陷和工程高性能至关重要。本研究采用分步合成的方法，设计并合成了均匀的同轴碳纳米管CNT@Li2MnSiO4@C，并将其作为高性能锂离子电池正极材料。结果表明，产物具有均匀的同轴结构，Li 2 MnSiO 4壳层厚度约为20 nm，最外层碳层厚度约为4.5 nm。这种合理的设计可以有效地提高导电性，缩短Li离子扩散长度，缓和充放电时的体积变化，缓解锰的溶解。CNT@Li2MnSiO4@C电极材料由于其独特的结构特征，克服了Li 2 MnSiO 4固有的电子/离子导电性差和容量衰减快的缺点，从而表现出良好的可逆容量和循环性能。(C)2018爱思唯尔有限公司版权所有。
The rational design of the nano structure is crucial for overcoming the inherent defect and engineering high performance of Li2MnSiO4 cathode material. In the present study, uniform coaxial carbon nanotube CNT@Li2MnSiO4@C has been designed and synthesized by an efficient step-by-step strategy and applied as high-performance cathode for lithium ion battery. It is demonstrated that the product has a uniform coaxial structure, the thickness of Li2MnSiO4 shell and outermost carbon layer is about 20 nm and 4.5 nm, respectively. This properly design can effectively improve the electric conductivity, shorten the Li ion diffusion length, relax volume change upon charge/discharge and relieve the manganese dissolution. Benefit from its unique structural features, the CNT@Li2MnSiO4@C electrode material overcomes the intrinsic disadvantage of Li2MnSiO4 of poor electronic/ionic conductivity and fast capacity fading rate, and hence exhibiting promising improvement on reversible capacity and cycling properties. (C) 2018 Elsevier Ltd. All rights reserved.