Test process of nitrile additive applied to lithium cobalt oxide system electrolyte

Abstract

The invention discloses a test process of a nitrile additive applied to a lithium cobalt oxide system electrolyte, and relates to the technical field of lithium ion batteries, and the test process comprises the preparation process of a soft package battery cell: (1) manufacturing a positive pole piece; (2) manufacturing a negative pole piece; (3) manufacturing a PE isolating membrane; (4) dissolving lithium hexafluorophosphate (LiPF6) in ethylene carbonate (EC), diethyl carbonate (DEC) and propyl propionate (PP) in a mass ratio of 1: 1: 1 in a glove box under argon protection, and then adding fluoroethylene carbonate (FEC), 1, 3-propane sultone (PS), and any one of adiponitrile (ADN), succinonitrile (SN), ethylene glycol bis (propionitrile) ether (DENE) or 1, 3, 6-hexanedinitrile (HTCN) to prepare an electrolyte; and (5) performing winding, assembling, baking, welding and sealing, liquid injection, formation and the like on the positive pole piece, the negative pole piece, a PE isolating membrane and electrolyte to prepare the soft package battery cell. A test result shows that the nitrile additive can improve the high-voltage resistance of the lithium ion battery electrolyte, and the high-temperature storage performance is particularly remarkably improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a testing process for nitrile additives applied to lithium cobaltate system electrolytes. Background technique [0002] At present, the development of emerging industries such as intelligent consumer electronics, renewable energy and electric vehicles has put forward higher requirements for the energy density and safety of lithium ions. Improving the operating voltage of lithium-ion batteries is an effective means to increase the energy density of batteries. However, most commercial lithium-ion battery electrolytes use carbonates as solvents, and carbonates are extremely unstable and easily oxidized and decomposed under high voltage, resulting in battery capacity attenuation and poor high-temperature performance. [0003] Nitrile organic solvents usually have excellent characteristics such as wide electrochemical window, high anode stability, low viscosity, and hig...

AI Technical Summary

Problems solved by technology

However, most commercial lithium-ion battery electrolytes use carbonates as solvents, and carbonates are extremely unstable and easy to oxidize and decompose under high voltage, resulting in battery capacity decay and poor high-temperature performance.

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