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Synthesis of Robust Silicon Nanoparticles@Void@Graphitic Carbon Spheres for High‐Performance Lithium‐Ion‐Battery Anodes
Author(s) -
Ma Xiaomei,
Gao Yujie,
Chen Min,
Wu Limin
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700173
Subject(s) - anode , materials science , silicon , nanocomposite , void (composites) , nanoparticle , lithium ion battery , shrinkage , chemical engineering , nanotechnology , composite material , battery (electricity) , optoelectronics , electrode , chemistry , quantum mechanics , engineering , power (physics) , physics
Silicon is known to be a promising candidate anode material for lithium‐ion batteries because of its ultrahigh capacity; however, its volume expansion/shrinkage during lithiation/delithiation reactions represent the biggest challenge in practical applications. In this paper, we successfully design and synthesize a new type of robust silicon nanoparticles@void@graphitic carbon spheres (Si@void@C) material to buffer the silicon volume changes in the cyclic lithiation/delithiation process. The as‐obtained Si@void@C nanocomposite spheres with well‐dispersed silicon nanoparticles, efficient void spaces, and graphitic carbon shells can endow this nanocomposite anode with the robustness to solve the volume expansion/shrinkage issue. As demonstrated by coin battery performances, the Si@void@C nanocomposite sphere‐based anode exhibits a specific capacity retention of 1565 and 1260 mAhg −1 at C/5 and C/2 (1C=4200 mAg −1 ), respectively, after 1000 cycles of deep charge/discharge processes (voltage between 0.01 and 2.7 V versus Li/Li + ). It provides a promising anode for a safe and high‐performance Si‐based materials in high‐performance lithium‐ion batteries.