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Fire‐Resistant Carboxylate‐Based Electrolyte for Safe and Wide‐Temperature Lithium‐Ion Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2024-12-20 , DOI: 10.1002/aenm.202403183 Yi Yang, Nan Yao, Yu‐Xing Yao, Lei Xu, Xue‐Fei Wen, Zeheng Li, Zhuo‐Lin Yang, Chong Yan, Jia‐Qi Huang
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2024-12-20 , DOI: 10.1002/aenm.202403183 Yi Yang, Nan Yao, Yu‐Xing Yao, Lei Xu, Xue‐Fei Wen, Zeheng Li, Zhuo‐Lin Yang, Chong Yan, Jia‐Qi Huang
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The combustion accident and narrow temperature range of rechargeable lithium‐ion batteries (LIBs) limit its further expansion. Non‐flammable solvents with a wide liquid range hold the key to safer LIBs with a wide temperature adaptability. Herein, a carboxylate‐based weak interaction electrolyte is achieved by molecular design, which consists of EDFA (ethyl difluoroacetate), 1,1,2,2‐tetrafluoroethyl‐2,2,3,3‐tetrafluoropropylether, and fluoroethylene carbonate. The inherent non‐flammable and wide liquid‐rang features of the electrolyte ensure the safety as well as the wide operating temperature of a battery. The high affinity between FSI− anions and counter Li+ guarantees a stable and inorganic‐components‐dominated electrolyte/electrode interphase with rapid Li+ de‐solvation kinetics, leading to perfect compatibility with graphite and avoiding side reactions between lithiated graphite and electrolyte. The rationally designed EDFA‐based electrolyte enables the thick graphite (4.4 mAh cm−2 ) || LiNi0.8 Co0.1 Mn0.1 O2 (4.0 mAh cm−2 ) cells to operate efficiently in a wide temperature range from −30 to 45 °C. The proposed EDFA‐based electrolyte enables the commercial 1.0 Ah graphite || NCA (LiNi0.8 Co0.15 Al0.05 O2 , >3.2 mAh cm−2 ) pouch cells stably cycle for >1100 cycles (>85% capacity retention) at 0.3C and >800 cycles at 1.0C (>92% capacity retention), while also endows the graphite/SiOx and Li anode‐based batteries with high energy density, long lifespan and high safety.
更新日期：2024-12-20
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