Preparation method of graphene low temperature battery

A low-temperature battery and graphene technology, which is applied to battery electrodes, secondary batteries, battery pack components, etc., can solve the problems of reducing the specific energy of the battery system, poor conductivity, etc., and achieve low internal resistance, excellent charging performance, The effect of high cycle performance

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

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Problems solved by technology

However, according to the characteristics of the lithium titanate battery negative electrode, its poor conductivity (especially at low temperature) is a problem we must face, and the current solution is to achieve it by increasing the content of the conductive agent. Feasible, but will invisibly reduce the weight specific energy of the battery system

Method used

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  • Preparation method of graphene low temperature battery
  • Preparation method of graphene low temperature battery
  • Preparation method of graphene low temperature battery

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Experimental program
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specific Embodiment approach 1

[0032] The preparation method of the graphene low-temperature battery of the present embodiment, such as Figure 6 As shown, the method is realized through the following steps: Step 1, the homogenization process of the slurry required for coating the positive electrode sheet of the battery is carried out through the lithium manganate positive electrode, the binder and the conductive agent. After the slurry is prepared, it is ready to be coated. cloth;

[0033] 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 sou...

specific Embodiment approach 2

[0039] The difference from the first embodiment is that in the preparation method of the graphene low-temperature battery of the present embodiment, in the first step, lithium manganate, a binder and a conductive agent are used to homogenize the slurry required for coating the positive electrode sheet of the battery Process, the process of preparing 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% to put the mixture 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% using NMP as a solvent in three times: the first time adding 15-25% of the total glue , 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 to make the slurry preliminarily mix and appear p...

specific Embodiment approach 3

[0040] The difference from specific embodiment 1 or 2 is that in the method for preparing a graphene low-temperature battery in this embodiment, in step 2, the negative electrode lithium titanate, a binder, and a conductive agent containing a conductive graphene slurry are used to coat the battery The homogenization process of the slurry required for the negative pole piece, 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:

[0041] 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 3000r / min Stir for 1-...

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Abstract

Preparation method of graphene low temperature battery. The invention is used for the battery 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 positive electrode of lithium manganate, a binder and a conductive agent; preparing the slurry required for coating the negative electrode sheet of the battery through the conductive agent containing 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 graphene low-temperature 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 conductivity (especially at low temperature) is a problem we must face, and the current solution is to achieve it by increasing the content of the conductive agent. It is feasible, but it will invisibly reduce the weight specific energy of the battery 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 low temperature and cycle performance while improving the ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0587H01M4/36H01M4/485H01M4/505H01M4/62H01M10/0525H01M10/0567H01M10/0569H01M2/16H01M2/26H01M50/44H01M50/531
CPCH01M4/364H01M4/485H01M4/505H01M4/625H01M10/0525H01M10/0567H01M10/0569H01M10/0587H01M2300/0042H01M50/44H01M50/531Y02E60/10Y02P70/50
Inventor 张博
Owner 张博
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