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Preparation method of graphene fast charge battery

A graphene and rechargeable battery technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of reducing the weight specific energy of the battery system, poor electrical conductivity, etc., to reduce internal resistance, improve electrical conductivity, and rate. The effect of improved performance and fast charge performance

Active Publication Date: 2019-06-04
张博
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the characteristics of the lithium titanate battery negative electrode, its poor electrical conductivity is a problem we must face at present, and the current solution is to increase the content of the conductive agent. Although this solution is feasible, it will invisibly reduce the performance of the battery. gravimetric energy of the system

Method used

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  • Preparation method of graphene fast charge battery
  • Preparation method of graphene fast charge battery
  • Preparation method of graphene fast charge battery

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Experimental program
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specific Embodiment approach 1

[0035] The preparation method of the graphene fast charge battery of the present embodiment, such as Figure 6 As shown, the method is realized through the following steps:

[0036] Step 1. Perform the homogenization process of the slurry required for coating the positive electrode sheet of the battery through the lithium manganate positive electrode, the binder and the conductive agent. After the slurry is prepared, it is ready for coating;

[0037] Step 2. Add graphene to the conductive agent, combine with the binder to carry out the homogenization process of the slurry required for coating the negative electrode sheet of the battery, and prepare the coating after the slurry is prepared; wherein, graphene and lithium titanate negative electrode Material compounding is to make tetrabutyl titanate, single-layer graphene, P123, and tert-butanol into a titanium source dispersion, and use lithium acetate dihydrate, deionized water, and tert-butanol to make a lithium source soluti...

specific Embodiment approach 2

[0053] The difference from the first specific embodiment is that in the preparation method of the graphene fast charging battery of the present embodiment, the step one uses lithium manganate, a binder and a conductive agent to uniformly coat the slurry required for the positive electrode sheet of the battery. Slurry process, the process of making the slurry is to select the lithium manganese oxide with the number of 90-98%, the binder with the number of 2-4%, and the conductive agent with the number of 2-4% together in the mixing In the material tank, mix at a stirring speed of 30r / min, and then add PVDF-1700 binder with a solid content of about 8% using NMP as a solvent in three times: add 15-25% of the total glue for the first time %, stir for 1-2 hours at a speed of 3000r / min, until the slurry is doughy; then open the mixing tank for scraping, and then add 20%-30% of the total binder, at 3000r / min 1-2 hours at the rotating speed of 3000r / min to make the slurry initially mi...

specific Embodiment approach 3

[0054] The difference from specific embodiment 1 or 2 is that in the preparation method of the graphene fast charging battery of the present embodiment, the second step is to apply the negative electrode lithium titanate, the binder and the conductive agent containing the conductive graphene slurry The homogenization process of the slurry required for the negative electrode sheet of the battery, the process of making the slurry is as follows, the main difference from the general battery is that graphene is introduced into the conductive agent and exists in the form of conductive slurry, and in the uniform process Adjustments need to be made, specifically:

[0055] Select 90-95% lithium titanate, 2-10% PVDF-1700 binder, and 5-10% conductive agent containing conductive graphene slurry to mix together In the tank, mix at a stirring speed of 30r / min, and then add PVDF-1700 binder with a solid content of about 8% in three times: add 15-25% of the total glue for the first time, at 3...

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Abstract

Preparation method of graphene fast charging battery. The invention is used in batteries. Existing rechargeable batteries can only reach 50‑70% of the total battery capacity when charged in a low temperature environment. The invention includes: preparing the slurry required for coating the positive electrode sheet of the battery through the lithium manganate positive electrode, the binder and the conductive agent; preparing the slurry required for coating the negative electrode sheet of the battery through the conductive agent containing the conductive graphene slurry Homogenization of materials; coating of battery positive and negative electrodes, and leaving empty foils on both sides of the positive and negative electrodes; rolling and shearing of battery positive and negative electrodes; battery assembly; battery formation and post-treatment process. The invention realizes the fast charging performance of the lithium manganate-lithium titanate battery at normal temperature, while maintaining its rate performance and cycle performance.

Description

Technical field: [0001] The invention relates to a preparation method of a lithium ion battery, in particular to a preparation method of a graphene fast charge battery. Background technique: [0002] Due to the advantages of innate materials, lithium titanate batteries have good cycle performance and excellent charging performance. However, according to the characteristics of the lithium titanate battery negative electrode, its poor electrical conductivity is a problem we must face at present, and the current solution is to increase the content of the conductive agent. Although this solution is feasible, it will invisibly reduce the performance of the battery. The weight-specific energy of the system. Due to its good electrical conductivity, excellent hardness and toughness, its combination with lithium titanate can effectively increase the active material ratio of battery materials, and more importantly, it can improve its cycle performance while improving the rate perform...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M4/485H01M4/505H01M4/62H01M10/0525H01M2/26H01M50/531
CPCH01M4/485H01M4/505H01M4/625H01M10/0525H01M10/058H01M50/531Y02E60/10Y02P70/50
Inventor 张博
Owner 张博
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