Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 11, Pages 12954-12964Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c02593
Keywords
tris(2-cyanoethyl) borate; LiCoO2 cathode; CEI film; cycling performance; high voltage
Funding
- National Natural Science Foundation of China [51720105014]
- Natural Science Foundation of Hunan Province, China [2020JJ1007]
- China Postdoctoral Science Foundation [2021T140745]
- Graduate Innovation Project of Central South University [2017zzts127]
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The addition of TCEB to the electrolyte can improve the cycling performance of LiCoO2 batteries at high voltages, forming a stable cathode electrolyte interface to enhance cycling stability.
Increasing the cutoff charge voltage is a promising strategy to enhance the actual discharge capacity of a LiCoO2 cathode. However, the oxidative decomposition of a carbonate electrolyte and the structural destruction of the cathode are intensified under a high operating voltage of 4.5 V, resulting in the poor cycling stability of a LiCoO2-based battery. Herein, a (TCEB), is proposed to improve the cyclability of LiCoO2 parallel to Li cells at elevated voltages. Due to the synergistic effect of boron- oxygen bonds (-B-O-) and nitrile groups (-C N), the TCEB additive can be preferentially decomposed on the surface of the LiCoO2 cathode, which generates a uniform and stable cathode electrolyte interphase (CEI) film to stabilize the cathode/electrolyte interface. As a result, a LiCoO2 parallel to Li battery using a TCEB-containing electrolyte shows excellent cycling performance with a capacity retention of 78.2% after 200 cycles at 1C and 4.5 V. In contrast, a battery cycled in a base electrolyte experiences a rapid capacity decay with a relatively low capacity retention of 40.4% at the same conditions. This work sheds light on an effective strategy for attaining stable cycling of the LiCoO2 cathode at high voltages via interfacial modification using an electrolyte additive, achieving high-energy-density lithium-ion batteries.
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