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题目:

Electrical, Mechanical, and Capacity Percolation Leads to High-Performance MoS2/Nanotube Composite Lithium Ion Battery Electrodes

作者:

Yuping Liu,1# Xiaoyun He,2# Damian Hanlon2, Andrew Harvey2, Umar Khan,2 Yanguang Li1* and Jonathan N. Coleman2*

单位:

1Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China

2School of Physics, CRANN and AMBER Centers, Trinity College Dublin, Dublin 2, Ireland

摘要:

Advances in lithium ion batteries would facilitate technological developments in areas from electrical vehicles to mobile communications. While two-dimensional systems like Mo2S are promising electrode materials due to their potentially high capacity, their poor rate capability and low cycle stability are severe handicaps. Here, we study the electrical, mechanical, and lithium storage properties of solution-processed MoS2/carbon nanotube anodes. Nanotube addition gives up to 1010-fold and 40-fold increases in electrical conductivity and mechanical toughness, respectively. The increased conductivity results in up to a 100× capacity enhancement to ~1200 mAh/g (~3000 mAh/cm3) at 0.1 A/g, while the improved toughness significantly boosts cycle stability. Composites with 20 wt % nanotubes combine high reversible capacity with excellent cycling stability (e.g., ~950 mAh/g after 500 cycles at 2 A/g) and high rate capability (~600 mAh/g at 20 A/g). The conductivity, toughness, and capacity scale with nanotube content according to percolation theory, while the stability increases sharply at the mechanical percolation threshold. We believe that the improvements in conductivity and toughness obtained after addition of nanotubes can be transferred to other electrode materials, such as silicon nanoparticles.

 

 

影响因子:

13.334

 

 

分区情况:

1

 

 

链接:

http://pubs.acs.org/doi/abs/10.1021/acsnano.6b01505

 

(责任编辑:金晓瑜 联系方式:xyjin@suda.edu.cn


 

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