A homogenate coating method of negative electrode lithium titanate and preparation method of lithium ion battery thereof

A technology of negative electrode lithium titanate and coating method, which is applied in the fields of homogenization and coating of negative electrode lithium titanate materials and the preparation of lithium ion batteries, which can solve the problem of environmental humidity sensitivity and affect the homogenization and coating of lithium titanate materials. effects, etc.

CN106450261BActive Publication Date: 2019-10-11TIANJIN ENERGIES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-10-11

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Abstract

The invention provides a homogenate coating method for negative electrode lithium titanate. The method comprises the following steps: a. Connecting a material storage box, a homogenate tank, and a coating chamber through a conveying pipeline into an integrated homogenate coating equipment b. Control the humidity in the material storage box and the homogenizing tank in the range of 0% to 10% RH; c. Put the homogenizing solvent and the negative electrode material in the material storage box, and control the humidity in the material storage box in the range of 0% to 10% RH. 10% RH range; d. Import the homogenate solvent and negative electrode material into the homogenate tank for stirring; e. Check the solid content, viscosity and fineness of the slurry, and prepare for discharging coating; f. Control the ambient humidity of the coating room Coating starts at 0%-30% RH, and the negative electrode coil is obtained by baking. The homogenate coating method of negative electrode lithium titanate provided by the present invention prevents lithium titanate slurry from absorbing moisture in the environment to form a gel state during the homogenate coating process, and reduces the flatulence problem of lithium titanate batteries to a certain extent. The electrical performance of the battery is improved.
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Description

technical field

[0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for homogenizing and coating negative electrode lithium titanate materials which are extremely sensitive to environmental humidity, and a preparation method for lithium ion batteries thereof. Background technique

[0002] Lithium-ion batteries have the advantages of high working voltage, no memory, small self-discharge, long service life, and high energy density, and have gradually become the preferred energy source for various electronic products; and with the development of electric vehicles and energy storage technologies, lithium-ion batteries It has a wider application field, and at the same time, the requirements for the safety and reliability, cycle life, service temperature range and fast charge and discharge of lithium-ion batteries are also getting higher and higher.

[0003] Lithium titanate lithium-ion battery has higher safety and r...

Examples

Embodiment

[0043] 1. A homogenate coating method of negative electrode lithium titanate, the method comprising the steps of:

[0044] a. Connect the purchased material storage box 1, homogenization tank 4 and coating chamber 5 through the delivery pipeline 3 into an integrated homogenization and coating equipment, and connect the air replacement device to the material storage box 1 and the homogenization unit through the gas pipeline. On the slurry tank 4; a dehumidifier is provided in the coating chamber 5; the material storage box 1 is a glove-tight box;

[0045] b. Turn on the air replacement button and pump dry N 2 , control the humidity in the material storage tank 1 and the homogenization tank 4 within the range of 10% RH, and then close the valves of each connection interface;

[0046] c. Transport and transfer the material packaging barrels 2 respectively containing the homogenizing solvent N-methylpyrrolidone (NMP), the negative electrode active material pure lithium titanate, ...