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Construction of a Stable LiNi0.8Co0.1Mn0.1O2 (NCM811) Cathode Interface by a Multifunctional Organosilicon Electrolyte Additive
journal contribution
posted on 2020-02-28, 21:43 authored by Yezhen Zheng, Ningbo Xu, Shijian Chen, Ying Liao, Guiming Zhong, Zhongru Zhang, Yong YangIt
is still a big challenge to stabilize a Ni-rich cathode interface
at high current rate and a long-term cycle in the present Li-ion battery
for electric vehicles. In this work, N,O-bis(trimethylsilyl)acetamide (BSA) is utilized as a multifunctional
electrolyte additive to stabilize the LiNi0.8Co0.1Mn0.1O2 cathode interface and enhance its electrochemical
performance. After 200 cycles, the LiNi0.8Co0.1Mn0.1O2/Li cell at 1C rate with 0.5% BSA shows
improved capacity retention of 86%, while it shows only 69.4% with
the baseline electrolyte. When the discharge rate is increased to
2C, the LiNi0.8Co0.1Mn0.1O2/Li cell with BSA additive shows improved capacity retention of 72.6%
after 400 cycles, while the counterpart is only 49.5%. The experimental
results show that HF and H2O can be scavenged by BSA, and
the hydrolysis of LiPF6 is reduced. Moreover, the BSA additive
can be preferentially oxidized during the charging process and form
a robust, uniform electrode/electrolyte interface film on the NCM811
cathode surface. Consequently, a better CEI film can suppress the
electrolyte decomposition, improve cathode interface stability, and
alleviate transition metal ions dissolution.
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transition metal ions dissolutionCEINi-rich cathode interfaceHFStable LiNi 0.8 Co 0.1 Mn 0.1 O 2capacity retentioncathode interface stabilityH 2 Omultifunctional electrolyte additiveLiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode interfaceBSA additive1 C rateMultifunctional Organosilicon Electrolyte AdditiveNCM 811 cathode surface
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