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A kind of preparation method of polymer electrolyte with cellulose as additive

A polymer and electrolyte technology, which is applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problem of low conductivity of polyvinylidene fluoride and achieve good performance

Active Publication Date: 2021-09-24
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low conductivity of polyvinylidene fluoride at room temperature, and provide a preparation method of polymer electrolyte with cellulose as an additive

Method used

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  • A kind of preparation method of polymer electrolyte with cellulose as additive
  • A kind of preparation method of polymer electrolyte with cellulose as additive
  • A kind of preparation method of polymer electrolyte with cellulose as additive

Examples

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specific Embodiment 1

[0034] Specific Example 1: A method for preparing a polymer electrolyte with cellulose as an additive in this embodiment:

[0035] 1. Pre-treatment of materials

[0036] Pre-treat all materials except lithium salts and liquid materials to ensure that the materials are sufficiently dry before use.

[0037] 2. Preparation of cellulose solution

[0038] Dissolve a certain amount of polyvinylidene fluoride and hydroxypropyl methylcellulose in N,N dimethylformamide, heat in a water bath for a certain period of time to fully mix the two;

[0039] 3. Preparation of casting solution

[0040] Take a certain quality of polystyrene and dissolve it in toluene. After the polystyrene is completely dissolved, add the cellulose solution in step 2 and add a corresponding quality of diluent. After stirring for 12 hours, add lithium bistrifluoromethanesulfonimide, Continue to stir for 6h to make the solution evenly dispersed;

[0041] 4. Preparation of Polymer Electrolyte

[0042] Cast the ...

specific Embodiment approach 2

[0053] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the pretreatment method described in step 1 is drying at 80° C. for 3 hours in a blast drying oven. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0054] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the temperature of the water bath heating described in step 2 is 60° C., and the heating time is 30 minutes. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of a polymer electrolyte with cellulose as an additive, which relates to a preparation method of a lithium ion battery polymer electrolyte membrane. The invention does not use liquid electrolyte, which improves the safety of battery use. The preparation method of the present invention is as follows: 1. Pre-treatment of materials; 2. Dissolving polyvinylidene fluoride and hydroxypropyl methylcellulose in N,N dimethylformamide fiber to prepare cellulose solution; 3. Prepare the casting solution of the electrolyte by mixing method; 4. Cast the casting solution to form a film to prepare the polymer electrolyte. The invention uses a blending method and a casting method to prepare the polymer electrolyte, and the method is simple to operate, easy to prepare, high in safety and strong in controllability. The invention is applied to the field of lithium ion batteries.

Description

【Technical field】 [0001] The invention relates to a method for preparing a lithium ion battery polymer electrolyte membrane. 【Background technique】 [0002] Polyvinylidene fluoride has a strong electron-withdrawing group -C-F, and is an ideal material for preparing electrolytes that are widely used. It only dissolves or swells in a few chemicals such as strong bases, ketones, and oleum. In addition, polyvinylidene fluoride has a high dielectric constant and a low glass transition temperature, which is beneficial to the dissociation of lithium salts. Therefore, polyvinylidene fluoride is a more suitable material for the preparation of polymer electrolytes in lithium-ion batteries. However, the structure of polyvinylidene fluoride is relatively regular, and the high crystallinity leads to the limitation of ion transmission, so it needs to be modified. [0003] Natural polymers are polymer substances that exist in living organisms, and can be roughly divided into three categ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0085Y02E60/10
Inventor 李丽波杜金田
Owner HARBIN UNIV OF SCI & TECH
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