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Preparation method of graphene low-temperature battery

A low-temperature battery and graphene technology, applied in the direction of secondary batteries, battery electrodes, battery components, etc., can solve the problems of poor electrical conductivity, reduce the weight specific energy of the battery system, etc., and achieve excellent charging performance and high cycle performance Effect

Active Publication Date: 2016-06-08
张博
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  • Summary
  • 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:

[0033] 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;

[0034] Step 2: Composite graphene and lithium titanate negative electrode materials by sol-gel method, then add graphene to the conductive agent, combine with binder to carry out the homogenization process of coating the slurry required for the battery negative electrode sheet, and prepare After the slurry is obtained, it is ready to be coated; among them, graphene is compounded with lithium titanate negative electrode materials, and tetrabutyl titanate, graphene (single layer), P123, and tert-butanol are prepared into a titanium sou...

specific Embodiment approach 2

[0040] 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 lithium manganate with a portion of about 90-98%, a bonding agent with a portion of about 2-4%, and a conductive agent with a portion of about 2-4%. In the mixing 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% of the total glue for the first time -25%, 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 about 20%-30% of the total binder, At a speed of 3000r / min for 1-2 hours, the slurry is initially mixed and becomes a paste; afte...

specific Embodiment approach 3

[0041]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:

[0042] Select about 90-95% lithium titanate, 2-10% PVDF-1700 binder, and 5-10% conductive agent containing conductive graphene slurry. In the mixing 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 about 15-25% of the total glue for the first time, Stir for 1-2 hours at...

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Abstract

The invention discloses a preparation method of a graphene low-temperature battery. The preparation method is applied to batteries of lithium titanate negative pole systems. An existing rechargeable battery only can be charged to 50-70% the total battery capacity in a low-temperature environment. The preparation method includes the steps that slurry needed for coating a battery positive pole plate is prepared from a lithium manganate positive electrode, a binding agent and a conductive agent; homogenate of slurry needed for coating a battery negative pole plate is prepared from a conductive agent containing conductive graphene slurry; coating of the battery positive pole and the battery negative pole is carried out, and blank foil is reserved on the upper and lower sides of the positive pole and the negative pole; rolling and cutting of the battery positive pole plate and the battery negative pole plate are carried out; battery assembling is carried out; battery formation and aftertreatment are carried out. The preparation method has the advantages that the battery can be charged to 90% the total battery capacity within 6 min in an environment where the temperature is -40 DEG C, and meanwhile the battery has super-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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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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