TY - JOUR
T1 - Amorphous TiO2 Shells
T2 - A Vital Elastic Buffering Layer on Silicon Nanoparticles for High-Performance and Safe Lithium Storage
AU - Yang, Jianping
AU - Wang, Yunxiao
AU - Li, Wei
AU - Wang, Lianjun
AU - Fan, Yuchi
AU - Jiang, Wan
AU - Luo, Wei
AU - Wang, Yang
AU - Kong, Biao
AU - Selomulya, Cordelia
AU - Liu, Hua Kun
AU - Dou, Shi Xue
AU - Zhao, Dongyuan
PY - 2017/12/12
Y1 - 2017/12/12
N2 - Smart surface coatings of silicon (Si) nanoparticles are shown to be good examples for dramatically improving the cyclability of lithium-ion batteries. Most coating materials, however, face significant challenges, including a low initial Coulombic efficiency, tedious processing, and safety assessment. In this study, a facile sol-gel strategy is demonstrated to synthesize commercial Si nanoparticles encapsulated by amorphous titanium oxide (TiO2), with core-shell structures, which show greatly superior electrochemical performance and high-safety lithium storage. The amorphous TiO2 shell (≈3 nm) shows elastic behavior during lithium discharging and charging processes, maintaining high structural integrity. Interestingly, it is found that the amorphous TiO2 shells offer superior buffering properties compared to crystalline TiO2 layers for unprecedented cycling stability. Moreover, accelerating rate calorimetry testing reveals that the TiO2-encapsulated Si nanoparticles are safer than conventional carbon-coated Si-based anodes.
AB - Smart surface coatings of silicon (Si) nanoparticles are shown to be good examples for dramatically improving the cyclability of lithium-ion batteries. Most coating materials, however, face significant challenges, including a low initial Coulombic efficiency, tedious processing, and safety assessment. In this study, a facile sol-gel strategy is demonstrated to synthesize commercial Si nanoparticles encapsulated by amorphous titanium oxide (TiO2), with core-shell structures, which show greatly superior electrochemical performance and high-safety lithium storage. The amorphous TiO2 shell (≈3 nm) shows elastic behavior during lithium discharging and charging processes, maintaining high structural integrity. Interestingly, it is found that the amorphous TiO2 shells offer superior buffering properties compared to crystalline TiO2 layers for unprecedented cycling stability. Moreover, accelerating rate calorimetry testing reveals that the TiO2-encapsulated Si nanoparticles are safer than conventional carbon-coated Si-based anodes.
KW - Core-shell structures
KW - Lithium-ion batteries
KW - Silicon nanoparticles
KW - Sol-gel coatings
KW - Titanium oxide
UR - http://www.scopus.com/inward/record.url?scp=85017382972&partnerID=8YFLogxK
U2 - 10.1002/adma.201700523
DO - 10.1002/adma.201700523
M3 - Article
AN - SCOPUS:85017382972
VL - 29
JO - Advanced Materials
JF - Advanced Materials
SN - 0935-9648
IS - 48
M1 - 1700523
ER -