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Gel polymer electrolyte for high-nickel ternary lithium battery and preparation method

A ternary lithium battery and gel polymer technology, applied in solid electrolytes, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of low electrolyte conductivity, achieve high specific capacity, increase porosity, and improve interface properties Effect

Inactive Publication Date: 2018-10-02
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem of low conductivity of the existing high-nickel ternary lithium battery polymer electrolyte, the present invention proposes a high-nickel ternary lithium battery gel polymer electrolyte and its preparation method

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  • Gel polymer electrolyte for high-nickel ternary lithium battery and preparation method

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Effect test

Embodiment 1

[0031] The preparation of a high-nickel ternary lithium battery gel polymer electrolyte of the present invention comprises the following steps:

[0032] S1. Preparation of silicon nitride / polyvinylidene fluoride-hexafluoropropylene composite polymer microporous membrane:

[0033] S11. Dissolving polyvinylidene fluoride-hexafluoropropylene copolymer powder in tetrahydrofuran, adding silicon nitride nanoparticles, and mixing uniformly to obtain a mixed solution; the polyvinylidene fluoride-hexafluoropropylene copolymer powder and silicon nitride The mass ratio of nanoparticles is 4:3; the silicon nitride nanoparticles have a purity of 99.6%, a particle diameter of 16nm, and a specific surface area of ​​200m 2 / g; The mixed solution concentration is 8g / L;

[0034] S12. Spin-coat the mixed solution prepared in step S11 on a smooth substrate by spin-coating, dry the solvent on the substrate and use track etching to prepare a silicon nitride / polyvinylidene fluoride-hexafluoropropyl...

Embodiment 2

[0038] The preparation of a high-nickel ternary lithium battery gel polymer electrolyte of the present invention comprises the following steps:

[0039] S1. Preparation of silicon nitride / polyvinylidene fluoride-hexafluoropropylene composite polymer microporous membrane:

[0040] S11. Dissolving polyvinylidene fluoride-hexafluoropropylene copolymer powder in N-methylpyrrolidone, adding silicon nitride nanoparticles, and mixing uniformly to obtain a mixed solution; the polyvinylidene fluoride-hexafluoropropylene copolymer powder The mass ratio to silicon nitride nanoparticles is 6:2; the silicon nitride nanoparticles have a purity of 99.7%, a particle size of 16nm, and a specific surface area of ​​200m 2 / g; The mixed solution concentration is 8g / L;

[0041] S12. Spin-coat the mixed solution prepared in step S11 on a smooth substrate by spin-coating, dry the solvent on the substrate and use track etching to prepare a silicon nitride / polyvinylidene fluoride-hexafluoropropylene ...

Embodiment 3

[0045] The preparation of a high-nickel ternary lithium battery gel polymer electrolyte of the present invention comprises the following steps:

[0046] S1. Preparation of silicon nitride / polyvinylidene fluoride-hexafluoropropylene composite polymer microporous membrane:

[0047] S11. Dissolving polyvinylidene fluoride-hexafluoropropylene copolymer powder in ether, adding silicon nitride nanoparticles, and mixing uniformly to obtain a mixed solution; the polyvinylidene fluoride-hexafluoropropylene copolymer powder and silicon nitride The mass ratio of nanoparticles is 8:4; the silicon nitride nanoparticles have a purity of 99.6%, a particle diameter of 18nm, and a specific surface area of ​​250m 2 / g; The mixed solution concentration is 8g / L;

[0048] S12. Spin-coat the mixed solution prepared in step S11 on a smooth substrate by spin-coating, dry the solvent on the substrate and use track etching to prepare a silicon nitride / polyvinylidene fluoride-hexafluoropropylene compos...

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Abstract

The invention belongs to the technical field of preparation of electrolytes for ternary batteries and particularly relates to a gel polymer electrolyte for a high-nickel ternary lithium battery and apreparation method. The preparation method of the gel polymer electrolyte for the high-nickel ternary lithium battery mainly comprises the steps of preparing a silicon nitride / (PVdF-HFP) composite polymer microporous membrane and preparing a PVdF-HFP-based gel polymer electrolyte compounded with silicon nitride. According to the polyvinylidene fluoride-hexafluoropropylene-based gel polymer modified through the silicon nitride, the mechanical property of a polymer membrane is improved and the porosity of the polymer membrane is also increased, so that migration of Li<+> ions in the gel polymerelectrolyte is accelerated and the ionic conductivity is improved. Inorganic oxide silicon nitride nanoparticles can adsorb trace water in a colloidal electrolyte and acidic materials generated through decomposition of an electrolyte lithium salt, so that the interfacial property between the polymer electrolyte and an electrode is effectively improved, the safety performance is high, the problem of a potential safety hazard of an existing high-nickel ternary liquid electrolyte is solved and the gel polymer electrolyte has relatively high specific capacity.

Description

technical field [0001] The invention belongs to the technical field of lithium battery electrolyte preparation, and in particular relates to a high-nickel ternary lithium battery gel polymer electrolyte and a preparation method thereof. Background technique [0002] Ternary battery material refers to a composite electrode material formed by the fusion of three electrode materials, which theoretically has the characteristics and advantages of each electrode material. Increasing the nickel content of ternary materials can greatly increase the specific capacity of the material, so high-nickel ternary materials must be an ideal material for large batteries in the future. [0003] However, with the increase of nickel content, the performance of the battery decreases with the increase of Ni in the positive electrode material: the polarization of the redox peak increases, which is caused by the transformation of H2 to H3 structure, resulting in volume shrinkage, capacity attenuatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCH01M10/0565H01M2300/0082Y02E60/10
Inventor 陈庆赵海林
Owner CHENDU NEW KELI CHEM SCI CO LTD