期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 38, 页码 42868-42879出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c12702
关键词
Li-ion batteries; safety; fire-preventing organic liquid electrolyte; high voltage; solid electrolyte interphase (SEI)
资金
- Ministry of Trade, Industry Energy [A0022-00725]
- National Research Foundation - Ministry of Science and ICT of Korea [2019R1A2C1084024]
- Nano-Material Technology Development Program through the National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [2009-0082580]
- National Research Foundation of Korea [4199990414701, 2019R1A2C1084024] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Battery safety is an ever-increasing significance to guarantee consumer's safety. Reducing or preventing the risk of battery fire and explosion is a must for battery manufacturers. Major reason for the occurrence of fire in commercial lithium-ion batteries is the flammability of conventional organic liquid electrolyte, which is typically composed of 1 M LiPF6 salt and ethylene carbonate (EC)-based organic solvents. Herein, we report the designed 1 M LiPF6 and EC-based nonflammable electrolyte including methyl(2,2,2-trifluoroethyl)carbonate, which breaks the conventional perception that EC-based liquid electrolyte is always flammable. The designed electrolyte also provides high anodic stability beyond the conventional charge cut-off voltage of 4.2 V. A graphite parallel to Li-Ni0.6Co0.2Mn0.2O2 lithium-ion full cell with our designed EC-based nonflammable electrolyte with a small fraction of vinylene carbonate additive under an aggressive condition of 4.5 V charge cutoff voltage, 0.5C rate, and 45 degrees C exhibits increased capacity, reduced interfacial resistance, and improved performance and rate capability. A basic understanding of how a high-voltage cathode-electrolyte interface and anode-electrolyte interface are stabilized and how failure modes are mitigated by fire-preventing electrolyte is discussed.
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