期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 39, 页码 43694-43704出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11996
关键词
electrolyte additive; trimethylsilyl group; Ni-rich cathode; residual lithium; lithium-ion battery
资金
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science, ICT & Future Planning [2018M1A2A2063341]
- National Research Foundation of Korea [2018M1A2A2063341] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The introduction of a trimethylsilyl (TMS) motif in electrolyte additives for lithium-ion batteries is regarded as an effectual approach to remove corrosive hydrofluoric acid (HF) that structurally and compositionally damages the electrode-electrolyte interface and gives rise to transition metal dissolution from the cathode. Herein, we present that electrolyte additives with TMS moieties lead to continued capacity loss of polycrystalline (PC)-LiNi0.8Co0.1Mn0.1O2 (NCM811) cathodes coupled with graphite anodes compared to additives without TMS as the cycle progresses. Through a comparative study using electrolyte additives with and without TMS moieties, it is revealed that the TMS group is prone to react with residual lithium compounds, in particular, lithium hydroxide (LiOH) on the PC-NCM811 cathode, and the resulting TMS-OH triggers the decomposition of PF5 created by the autocatalytic decomposition of LiPF6 that generates reactive species, namely, HF and POF3. This work aims to offer a way to build favorable interface structures for Ni-rich cathodes covered with residual lithium compounds through a study to figure out the roles of TMS moieties of electrolyte additives.
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