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Si@void@C Nanofibers Fabricated Using a SelfPowered Electrospinning System for Lithium-Ion Batteries Yu Han, Jingdian Zou, Zhen Li, Wenqiang Wang, Yang Jie, Jinming Ma, Bin Tang, Qi Zhang, Xia Cao, Shengming Xu, and Zhong Lin Wang ACS Nano, Just Accepted Manuscript • DOI: 10.1021/acsnano.8b01558 • Publication Date (Web): 23 Apr 2018 Downloaded from http://pubs.acs.org on April 23, 2018
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ACS Nano
Si@void@C Nanofibers Fabricated Using a Self-Powered Electrospinning System for Lithium-Ion Batteries Yu Han, 1 Jingdian Zou, 2, 3 Zhen Li, 1 Wenqiang Wang, 1 Yang Jie, 4 Jinming Ma, 4 Bin Tang, 5
1
Qi Zhang, 5 Xia Cao, 2, 3, 4* Shengming Xu 1* and Zhong Lin Wang 2, 3, 6*
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084,
China.
2
Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing
100083, China.
3
School of Nanoscience and Technology, University of Chinese Academy of Sciences,
Beijing 100049, China.
4
Research Center for Bioengineering and Sensing Technology, Beijing Key Laboratory for
Bioengineering and Sensing Technology, School of Chemistry and Biological engineering, and Beijing Municipal Key Laboratory of New Energy Materials and Technologies, University of Science and Technology Beijing, Beijing, 100083, China.
5
Fundamental Industry Training Center, Tsinghua University, Beijing 100084, China
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School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta,
GA, 30332-0245, USA
* To whom correspondence should be addressed, E-mail:
[email protected] (S. M. Xu);
[email protected] (X. Cao);
[email protected] (Z. L. Wang)
ABSTRACT
In recent years, research in lithium-ion batteries (LIBs) has been focused on improving their performance in various ways, such as density, capacity and life time, but little attention has been paid to the energy consumption costed in the manufacturing process. Herein, we report an energy-efficient preparation method of anode materials for LIBs based on a self-powered electrospinning system without an external power source, which consists of a rotatory triboelectric nanogenerator (r-TENG), a power management circuit and an electrospinning unit. By harvesting kinetic energy from a handle rotation, the r-TENG is able to fully power the electrospinning system to fabricate nanofibers for LIBs. The as-obtained Si@void@C nanofibers present outstanding cyclic performance with a discharge capacity of 1045.2 mA h g-1 after 100 cycles and 88% capacity retention, along with an excellent high rate capacity of 400 mA h g-1 at a current density of 5 A g-1, which are completely comparable with those made by a commercial electrospinning equipment. Our study demonstrates an innovative and
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distinct approach toward an extremely low-cost preparation procedure of electrode materials, leading to a great breakthrough for LIBs production industry.
KEYWORDS: self-powered electrospinning system, triboelectric nanogenerator, nanofiber, anode material, lithium-ion battery
Since the initial commercialization by Sony in 1991, lithium-ion batteries (LIBs) have always been the mainstay in energy storage domain owing to their excellent energy conversion efficiency, long cycling life and high energy density.1-12 With their expanding territories into electrical vehicles (EVs), flexible electronics and aerospace equipment, LIBs are confronted with great challenges in the performance improvement of electrode materials.1, 13-15
In recent years, the Si/C composite is considered as the most attractive and promising
candidate for anode materials.16-22 It presents unexampled predominance: silicon possesses high theoretical capacity (around 4200 mA h g-1 corresponding to Li4.4Si at ambient temperature) and low electrochemical potential of Li insertion/extraction (
