期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 8, 页码 5380-5385出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00976
关键词
NCM811; LiPF6 hydrolysis; water; HF; capacity fade; impedance rise
资金
- Office of Vehicle Technologies at the U.S. Department of Energy
- U.S. Department of Energy Office of Science laboratory [DE-AC02-06CH11357]
Instability of nickel-rich layered oxides at high voltages is an impediment to their wider use in Li-ion batteries. HF generated via LiPF6 hydrolysis accelerates corrosion, further destabilizing the material. Ceramic particles are believed to interfere with this corrosion by scavenging HF. Here we show that the likely mechanism is, in fact, disruption of the hydrolytic cycle due to adsorption of water on ceramic particles, which MgO performed the best. We suggest that hydrolysis prevention rather than post-factum remediation of hydrolytic damage makes a more efficient strategy for protection of the high-voltage cathodes.
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