10.1021/acsnano.9b02129.s002
Shiqi Liu
Shiqi
Liu
Xu Zhang
Xu
Zhang
Pengfei Yan
Pengfei
Yan
Renfei Cheng
Renfei
Cheng
Yushu Tang
Yushu
Tang
Min Cui
Min
Cui
Boya Wang
Boya
Wang
Liqiang Zhang
Liqiang
Zhang
Xiaohui Wang
Xiaohui
Wang
Yuyuan Jiang
Yuyuan
Jiang
Lin Wang
Lin
Wang
Haijun Yu
Haijun
Yu
Dual
Bond Enhanced Multidimensional Constructed Composite
Silicon Anode for High-Performance Lithium Ion Batteries
American Chemical Society
2019
Dual Bond Enhanced Multidimensional Constructed Composite Silicon Anode
cycle stability
High-Performance Lithium Ion Batteries
lithium ion batteries
bond
anode materials
silicon-based anode materials
X-ray photoelectron spectroscopy technique
2019-07-25 17:34:58
Media
https://acs.figshare.com/articles/media/Dual_Bond_Enhanced_Multidimensional_Constructed_Composite_Silicon_Anode_for_High-Performance_Lithium_Ion_Batteries/9106001
The
development of silicon-based anode materials is important for
improving the energy density of current lithium ion batteries. However,
there are still strong demands for these materials with better cycle
stability and higher reversible capacity. Here, a kind of dual bond
restricted MXene-Si-CNT composite anode materials with enhanced electrochemical
performance is reported. These dual bonds have been clearly revealed
by an X-ray photoelectron spectroscopy technique and also proven by
theoretical calculations with spontaneous reaction energy values (−0.190
and −0.429 eV/atom for Ti–Si and C–Si bonds,
respectively). The cycle stability of the composites, prepared by
a facile ball-milling synthetic method, can obviously be improved
because of the existence of these dual bonds and the multidimensional
constructed architecture. The MXene-Si-CNT composite with 60 wt %
silicon possesses the best overall performance, with ∼80% capacity
retention after 200 cycles, and achieves 841 mAh g<sup>–1</sup> at 2 A g<sup>–1</sup>. This approach demonstrates a promising
strategy to exploit high-performance anode materials and lessens the
immanent negative effect of silicon-based materials. Furthermore,
it is significant to extend this method to other anode materials with
serious volumetric change problems during the cycling process.