Weakly solvated EC-free linear alkyl carbonate electrolytes for Ni-rich cathode in rechargeable lithium battery.

ABSTRACT: Ethylene carbonate (EC) in the electrolyte is not stable in cells operated at high voltage (≥4.4V) or with Li metal anode, which greatly reduce the energy density and lifetime of the rechargeable lithium battery. Herein, an EC-free linear alkyl carbonate-based electrolyte is developed, which enables the high-voltage (≥4.4V) and low-temperature (-30°C) application of Ni-rich cathode (LiNi_0.8Mn_0.1Co_0.1O₂, NCM811). The EC-free system, consisting of LiPF₆ and LiNO₃ in ternary linear alkyl carbonates, possesses low viscosity, weakly solvated structure, and high interfacial stability with both the Ni-rich cathode and the Li metal anode to avoid continuous electrode/electrolyte side reactions and metal dissolution from the cathode.

SUBMITTER: Kang G 

PROVIDER: S-EPMC9791360 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature