Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 11, Pages 12201-12210Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c01891
Keywords
lithium-ion batteries; siloxane modification; interface ion doping of Si; high-voltage cathodes; LiNi0.5Mn1.5O4
Funding
- National Key Research and Development Program [SQ2016YFGX100026]
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The SiO2 modification of the LNMO cathode material improved the cycling performance and rate capability of the battery.
Spinel LiNi0.5Mn1.5O4(LNMO) is considered as a next generation lithium ion battery (LIB) cathode material worth studying on account of its outstanding features. However, it is held back by poor cycling performance originated from the structure instability and side reactions. Here, spinel LNMO is decorated homogeneously via a facile hydrolysis and adsorption of gamma-methyl-propylene trimethoxysilane (KH570), followed by thermal treatment at 750 degrees C, to bring a SiO2 modification shell at the surface of LNMO and realize the ion doping of Si. The sintering process also brings more Mn3+ in LNMO. However, only a moderate increase of Mn3+ in LNMO can enhance the conductivity of ions and electrons, benefiting the enhancement of rate performance. The 0.8%-SiO2@LNMO cathode exhibits a high reversible capacity of 129 mAh g(-1), retaining a great capacity retention of 88% after 800 cycles at 1 C and 89.7% after 1000 cycles at 3 C. Meanwhile, a superior rate capability (90 mAh g(-1) at 5 C) is achieved by applying the galvanostatic charge/discharge test.
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