Research progress on high-voltage electrolytes for ternary NCM lithium-ion batteries

doi:10.19799/j.cnki.2095-4239.2019.0287

Abstract

Abstract:

LiNi_xCo_yMn_1-x-yO₂ (NCM) cathodes have large reversible capacity, high operating voltage, and good rate capability, which are essential in the field of electric vehicles (EVs). The requirements of endurance mileage of electric vehicles can be met by increasing the energy density of lithium-ion batteries for which the cut-off working voltage must be increased. However, the narrow electrochemical window of current electrolytes could result in poor cycle performance at high voltage. This review focuses on NCM battery electrolytes under high working voltage. Starting from the frontier orbital theory related to the decomposition of electrolytes and the interface reactions between electrodes and electrolytes, this review identifies approaches to improve the high-voltage working performance of lithium-ion batteries with ternary positive materials. Moreover, the design progress of non-aqueous electrolytes in solvents, Li salts, additives and other aspects and the application of solid electrolytes and ionic liquids in NCM batteries at high working voltages are summarized. Finally, improvement strategies are proposed for the practical application of electrolytes under high working voltage and the development trend of solid electrolyte in the future is prospected.

Key words: lithium ion batteries, nickel-cobalt-manganese ternary cathode materials, high voltage electrolytes, cathode-electrolyte interface

CLC Number:

TM 911

MAO Shulan, WU Qian, WANG Zhuoya, LU Yingying. Research progress on high-voltage electrolytes for ternary NCM lithium-ion batteries[J]. Energy Storage Science and Technology, 2020, 9(2): 538-550.

Figures/Tables 3

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