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Preparation method of high-performance all-solid-state lithium ion battery

A lithium-ion battery, all-solid-state technology, applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of low ionic conductivity of the diaphragm of all-solid-state lithium-ion batteries, and achieve the effect of high safety

Pending Publication Date: 2021-12-24
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low ionic conductivity of the existing method for preparing all-solid-state lithium-ion battery diaphragms, and to provide a high-performance preparation method for all-solid-state lithium-ion batteries

Method used

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  • Preparation method of high-performance all-solid-state lithium ion battery
  • Preparation method of high-performance all-solid-state lithium ion battery
  • Preparation method of high-performance all-solid-state lithium ion battery

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Embodiment 1

[0056] Embodiment 1: The preparation method of a kind of high-performance all-solid-state lithium-ion battery of this embodiment is to prepare according to the following steps:

[0057] 1. Pretreatment of polymer electrolyte precursor solution

[0058] Dissolve 0.4g of poly(vinylidene fluoride-hexafluoropropylene) copolymer, 0.1g of polyvinylidene fluoride and 0.1g of organic montmorillonite in organic solvent N,N-dimethylformamide, and stir evenly at room temperature , and mix the uniformly stirred solution;

[0059] 2. Preparation of polymer electrolyte precursor liquid monomer

[0060] Add 5.4 g of methyl methacrylate and 1 g of lithium salt to the homogeneous solution obtained in step 1, and stir at room temperature to obtain a uniform light yellow solution;

[0061] 3. Polymerization of polymer electrolyte precursor liquid monomer

[0062] Add an initiator to the light yellow solution in step 2, and pre-polymerize for 30 minutes under heating conditions to obtain a pre...

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Abstract

The invention relates to a preparation method of a high-performance all-solid-state lithium ion battery. The invention aims to solve the problem of low conductivity of a diaphragm of the all-solid-state lithium ion battery prepared by the existing method. The method comprises the following steps of 1, preparing a polymer electrolyte precursor solution; 2, preparing a polymer electrolyte precursor solution monomer; 3, preparing the polymer electrolyte precursor solution monomer polymerization; 4, preparing the polymer electrolyte of the all-solid-state lithium ion battery; and 5, assembling the battery. The ionic conductivity sigma of the diaphragm of the all-solid-state lithium ion battery prepared by the method reaches 1.1*10 <-3> S.cm <-1>, the safety performance of the lithium ion battery is greatly improved, and the all-solid-state lithium ion battery has the advantages of high charge / discharge specific capacity, stable cycle performance, safe operation, simplicity and convenience and the like, and is suitable for large-scale preparation and commercial application. The method is applied to the field of all-solid-state lithium ion batteries.

Description

technical field [0001] The invention relates to a method for preparing a polymer electrolyte for an all-solid lithium ion battery. Background technique [0002] Commercial lithium-ion batteries still face safety concerns because they contain an electrolyte that can easily catch fire and leak dangerously. At the same time, due to the growth of lithium dendrites, the development of traditional liquid lithium-ion batteries has also encountered a bottleneck. Therefore, the flammable electrolyte is the main obstacle to be overcome, and at the same time, the contradiction between high energy density and high safety needs to be resolved. Therefore, solid-state polymer-based lithium-ion batteries have attracted extensive attention due to their high safety. However, their low ionic conductivity, poor mechanical properties, and insufficient cycle life limit their practical applications. Wu et al. selected nickel phosphate (VSB-5) nanorods as fillers to prepare a novel polyethylene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0565H01M10/0525C08L33/12C08L27/16C08K9/04C08K3/34C08J5/18
CPCH01M10/058H01M10/0565H01M10/0525C08J5/18C08J2333/12C08J2427/16C08J2327/16C08J2433/12C08K9/04C08K3/346Y02E60/10Y02P70/50
Inventor 李丽波赵杨明悦单宇航崔文俊陈晓川
Owner HARBIN UNIV OF SCI & TECH
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