Lithium-ion battery

The lithium-ion battery with LiNi x Co y Mn z L (1-x-y-z)O2 active material and Structural Formula 1 electrolyte compound addresses gas generation and structural instability, enhancing temperature cycle performance by forming a protective film that stabilizes the electrode.

JP7783893B2Active Publication Date: 2025-12-10SHENZHEN CAPCHEM TECH CO LTD
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Patent Information

Application Number
JP2023537202
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-04-13
Filing Date
2021-12-16
Publication Date
2025-12-10
Estimated Expiration
2041-12-16

AI Technical Summary

Technical Problem

Conventional high-nickel lithium-ion batteries suffer from severe gas generation and poor high-temperature cycle performance due to the decomposition of lithium carbonate and electrolyte oxidation on the positive electrode, leading to structural instability.

Method used

A lithium-ion battery design incorporating a positive electrode with LiNi x Co y Mn z L (1-x-y-z)O2 active material and a non-aqueous electrolyte containing a compound represented by Structural Formula 1 (ADBEC), which forms a protective film on the electrode surface to inhibit decomposition and stabilize the structure.

Benefits of technology

The protective film reduces gas generation and enhances high-temperature cycle performance by preventing lithium carbonate decomposition and stabilizing the positive electrode structure, resulting in improved capacity retention and stability.

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Abstract

In order to overcome the problems existing in conventional high-nickel high-pressure lithium-ion batteries, such as severe gas generation and deterioration of high-temperature cycle characteristics, the present invention provides a lithium-ion battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte, wherein the positive electrode includes a positive electrode material layer, the positive electrode material layer includes a positive electrode active material, and the positive electrode active material is LiNi x Co y Mn z L (1-x-y-z) O 2 wherein L is Al, Sr, Mg, Ti, Ca, Zr, Zn, Si, Cu, V or Fe, 0.5≦x≦1, 0≦y≦0.5, 0≦z≦0.5, 0≦x+y+z≦1, and the upper limit voltage of the lithium ion battery is ≧4.2V; and the non-aqueous electrolyte solution comprises a solvent, an electrolyte salt, and a compound represented by the following structural formula 1: [Structural formula 1] ADBEC When the total mass of the nonaqueous electrolyte is taken as 100%, the amount of the compound represented by the structural formula 1 added is 0.01 to 5.0%. The present invention uses the compound represented by the structural formula 1 in combination with a high-nickel ternary material to obtain a ternary high-nickel lithium ion battery having a high high-temperature cycle capacity retention rate and little cycle gas generation.
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Citation Information

Patent Citations

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    CN108258311A

  • Additive for battery electrolyte, lithium ion battery electrolyte and lithium ion battery

    CN110931863A

  • Lithium ion battery electrolyte additive cyclic ethylene carbonate sulfate and preparation method thereof

    CN111755753A

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  • Cyclic sulfate compound, non-aqueous electrolyte solution containing same, and lithium secondary battery

    WO2012053644A1