Battery diaphragm for solid-state lithium ion battery and preparation method of battery diaphragm

A technology for lithium-ion batteries and battery separators, which is applied in the field of battery separators for solid-state lithium-ion batteries and its preparation, and can solve the problems of electrolyte solution loss, poor processing and deformation performance, and low strength

Active Publication Date: 2017-05-31
河南惠强新能源材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Patent CN201110347022 discloses a method for preparing an ionic liquid gel electrolyte, adding a film-forming polymer to a mixed solvent formed by a solvent-non-solvent to prepare a uniform solution coating film and a white porous film; immersion preparation In the ionic liquid electrolyte, a solid electrolyte membrane is obtained. The electrochemical window of the membrane is greater than 5V, which has good electrical properties. However, because the ionic liquid is directly soaked and not fixed in the porous membrane, the electrolyte solution is lost during use;
[0008] Patent CN200810162187.X discloses a preparation method of high-strength ionic liquid gel, adding monomers, initiators, and cross-linking agents into ionic liquids for polymerization to obtain high-strength io...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The battery separator for solid-state lithium-ion batteries provided in this example is prepared through the following steps:

[0032] (1) Prepare an ethanol solution of ionic liquid polymer and aromatic ketone ultraviolet crosslinking agent, specifically:

[0033] After mixing the ionic liquid polymer and the aromatic ketone ultraviolet crosslinking agent in an equimolar ratio evenly, add absolute ethanol with 2 times the weight of the mixture, and make the mixture fully solvent in ethanol;

[0034] The cation of the ionic liquid polymer is polyimidazolium salt, specifically poly(N-methyl-vinyl) imidazolium chloride;

[0035] The polyaromatic ketone ultraviolet crosslinking agent is benzophenone;

[0036] (2) Ultraviolet crosslinking of polyimidazolium salt and polypropylene porous membrane, specifically:

[0037] Immerse the polypropylene porous membrane in the ethanol solution of the ionic liquid polymer-aromatic ketone ultraviolet crosslinking agent (polyimidazoli...

Embodiment 2

[0044] The preparation steps of the battery diaphragm for solid-state lithium-ion batteries provided in this example are the same as those in Example 1, and only some of the reaction parameters are adjusted as follows:

[0045] In step (1): the polyimidazole salt is poly(N-ethyl-vinyl)imidazole chloride, the polyaromatic ketone ultraviolet crosslinking agent is acetophenone, and the amount of absolute ethanol is 10 times the weight of the mixture;

[0046]In step (2): the polypropylene porous membrane is a uniaxially stretched polypropylene membrane with a porosity of 50% and an average pore diameter of 200nm. The soaking time is 5 minutes, and the drying treatment parameters are heat treatment at 90°C for 5 minutes, 500mJ / cm 2 UV irradiation for 30s;

[0047] In step (3): the lithium anion salt is lithium bis(trifluoromethylsulfonyl)amide, the concentration is 30wt%, soaking for 5 minutes, and drying at 105° C. for 5 minutes.

[0048] The battery separator for the prepared s...

Embodiment 3

[0050] The preparation steps of the battery diaphragm for solid-state lithium-ion batteries provided in this example are the same as those in Example 1, and only some of the reaction parameters are adjusted as follows:

[0051] In step (1): the polyimidazole salt is poly(N-methyl-vinyl)imidazolium bromide, the polyaromatic ketone ultraviolet crosslinking agent is benzophenone, and the amount of absolute ethanol is 7 times the weight of the mixture;

[0052] In step (2): The polypropylene porous membrane is a uniaxially stretched polypropylene membrane with a porosity of 43% and an average pore diameter of 110nm. The soaking time is 3 minutes, and the drying treatment parameters are heat treatment at 80°C for 2 minutes, 310mJ / cm 2 UV irradiation for 10s;

[0053] In step (3): the anion lithium salt is lithium hexafluorophosphate, the concentration is 20wt%, soaking for 4 minutes, and drying at 100° C. for 2 minutes.

[0054] The battery separator for the prepared solid-state l...

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Abstract

The invention belongs to the technical field of preparation of lithium ion battery diaphragms, and particularly relates to a battery diaphragm for a solid-state lithium ion battery and a preparation method of the battery diaphragm. The battery diaphragm is prepared through steps as follows: preparation of an ethanol solution of ionic liquid polymers and an aromatic ketone ultraviolet cross-linking agent; ultraviolet cross-linking of polyimidazole salts and a polypropylene porous membrane; anionic recombination of the polyimidazole cross-linked polypropylene porous membrane; final drying for preparation of the battery diaphragm for the solid-state lithium ion battery. The overall performance of the ionic liquid polymers is enhanced by the aid of the polypropylene porous membrane, and a finished product of the battery diaphragm for the solid-state lithium ion battery better overcomes defects that an existing ionic liquid diaphragm is low in strength, difficult to form and prone to damage, has better strength and stability and has certain popularization and application value.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragm preparation, and in particular relates to a battery diaphragm for a solid-state lithium-ion battery and a preparation method thereof. Background technique [0002] All-solid-state lithium-ion batteries have the advantages of high safety performance, high energy density, and wide operating temperature range, and are an important direction for the development of lithium-ion batteries. In terms of safety, the flammable and explosive organic electrolyte is the key factor causing the safety problem of lithium-ion batteries. Abnormal conditions such as overcharging and internal short circuit may cause the liquid electrolyte to heat up, and there is a risk of spontaneous combustion or even explosion. The safety of all-solid-state batteries that replace organic electrolytes with solid-state electrolytes can be greatly improved. In addition, for all-solid-state batteries, since there...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/411H01M50/491H01M50/497
CPCH01M50/403H01M50/411Y02E60/10
Inventor 王红兵唐浩林陈小莉马兴玉
Owner 河南惠强新能源材料科技股份有限公司
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