Preparation and energy storage properties of flexible and self-supporting CNT/Si composite films

doi:10.11949/0438-1157.20200146

Abstract

Abstract:

A method for preparing large-area CNT/Si flexible self-supporting film has been developed. The prepared CNT/Si composite film is adjustable in size and has good flexibility. As the anode of lithium-ion battery, the silicon load in the film has a significant effect on the specific capacity and cycle stability of the electrode. The CNT/Si composite electrode with 52% silicon load shows excellent electrochemical performance. The specific charge capacity of the electrode is 1156 mA·h/g at the current density of 1 A/g, 975 mA·h/g at the reversible charge capacity of 200 cycles, and the capacity retention rate is 84%.

Key words: nanotechnology, preparation, flexible, self-supporting, silicon anode, composite material

摘要：

开发了一种制备大面积CNT/Si柔性自支撑薄膜的方法，制备的CNT/Si复合薄膜尺寸可调且具有良好的柔性。作为锂离子电池负极，薄膜中硅的负载量对电极比容量及循环稳定性有显著影响。硅负载量为52%的CNT/Si复合电极表现出优良的电化学性能，1 A/g电流密度下电极充电比容量为1156 mA·h/g，循环200圈可逆充电比容量为975 mA·h/g，容量保持率达84%。

关键词: 纳米技术, 制备, 柔性, 自支撑, 硅负极, 复合材料

CLC Number:

TM 912

Lianghan LI, Xianlong JIAN, Sen ZHANG, Ming ZHANG, Yuping SUN, Xinchang WANG. Preparation and energy storage properties of flexible and self-supporting CNT/Si composite films[J]. CIESC Journal, 2020, 71(6): 2804-2810.

李靓晗, 简现龙, 张森, 张明, 孙玉平, 王新昌. 柔性、自支撑CNT/Si复合薄膜的制备及储能性能[J]. 化工学报, 2020, 71(6): 2804-2810.

Figures/Tables 4

Fig.1 Schematic illustration of the preparation of the flexible and free-standing CNT/Si hybrid film

Fig.2 Digital photos of the flexible and free-standing CNT/Si hybrid film

Fig.3 Micro-morphology and structure of the flexible and free-standing CNT/Si hybrid film

Fig.4 Electrochemical performance of the flexible and free-standing CNT/Si hybrid film

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