Preparation method of cold-resistant lithium manganate-lithium titanate battery

A technology of lithium titanate battery and lithium manganese oxide, which is applied in the direction of battery electrodes, secondary batteries, battery components, etc., can solve battery flatulence, affect the reliability of battery packs, and reduce battery discharge performance or cycle performance, etc. problem, achieve the effect of reducing internal resistance, avoiding excessive heat generation, and reducing internal resistance

Active Publication Date: 2019-06-07
张博
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the condition of minus 40 degrees, both the discharge performance and the cycle performance of the battery have a very serious decline.
Also, there is a danger of the battery becoming gassy at high temperatures
Moreover, due to the serious self-discharge under low temperature conditions, it greatly affects the reliability of the battery pack.

Method used

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specific Embodiment approach 1

[0027] The preparation method of the cold-resistant lithium manganate-lithium titanate battery of the present embodiment, such as Figure 6 As shown, the method is realized through the following steps:

[0028] 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;

[0029] Step 2. Perform the homogenization process of the slurry required for coating the battery negative electrode sheet through the lithium titanate negative electrode, the binder, and the conductive agent containing the conductive graphene slurry. After the slurry is prepared, it is ready for coating;

[0030] Step 3. Use the slurry made in step 1 and step 2 to carry out the coating process of the positive and negative electrodes of the battery respectively, and leave empty foils on the upper and lower sid...

specific Embodiment approach 2

[0035] The difference from the specific embodiment 1 is that in the preparation method of the cold-resistant lithium manganese oxide-lithium titanate battery of the present embodiment, the step 1 uses lithium manganate, a binder and a conductive agent to coat the positive electrode sheet of the battery. The homogenization process of the slurry is required. The process of preparing the slurry is to select lithium manganate with a portion of 90-98%, a binder with a portion of 2-4%, and a conductive material with a portion of 2-4%. Put the binder together in the mixing tank, mix at a stirring speed of 30r / min, and then add the PVDF-1700 binder with a solid content of about 8% using NMP as a solvent in three times: add the total glue for the first time 15-25% of the liquid, stirring 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 a speed of 3000r / min for 1-2 hours to make the sl...

specific Embodiment approach 3

[0036]The difference from specific embodiment 1 or 2 is that, in the preparation method of the cold-resistant lithium manganate-lithium titanate battery of the present embodiment, in step 2, the lithium titanate of the negative electrode, the binder and the conductive graphene slurry are used. The conductive agent is used to homogenize the slurry required for coating the negative electrode sheet of the battery. The process of preparing 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 adjustments need to be made in the uniform process, specifically: choose lithium titanate with a share of 90-95%, PVDF-1700 binder with a share of 2-10%, and a share of 5-10% The conductive agent containing the conductive graphene slurry is put together in the mixing tank, mixed at a stirring speed of 30r / min, and then the PVDF-1700 binder with a solid content of about 8...

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Abstract

A preparation method of a cold-resistant lithium manganate-lithium titanate battery. The invention is used in batteries of lithium titanate negative electrode system. 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 has the advantages of being able to charge to 90% of the total battery capacity in six minutes under the environment of minus 40 degrees, and also has the advantages of ultra-high cycle performance and low internal resistance.

Description

Technical field: [0001] The invention relates to a preparation method of a lithium ion battery, in particular to a preparation method of a cold-resistant lithium manganate-lithium titanate battery. Background technique: [0002] Due to the advantages of innate materials, lithium titanate batteries have good cycle performance and good charging performance. However, according to the characteristics of lithium titanate batteries, there are still considerable problems in its adaptability to the environment, especially its low-temperature performance at minus 40 degrees has very broad prospects for its application. For example, although its charging performance is very good, the number of cycles is high. But realizing these all is carried out under the condition of normal temperature. Under the condition of minus 40 degrees, both the discharge performance and the cycle performance of the battery have a very serious decline. In addition, there is a danger of the battery becomin...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/1391H01M4/62H01M2/16H01M10/0566H01M50/409
CPCH01M4/1391H01M4/485H01M4/505H01M4/625H01M10/0566H01M50/409Y02E60/10
Inventor 张博
Owner 张博
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