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Homogenate coating method for negative lithium titanate and method for preparing lithium ion battery with negative lithium titanate

A negative electrode lithium titanate and lithium ion battery technology, which is applied in electrode manufacturing, secondary batteries, battery electrodes, etc., can solve the problems of environmental humidity sensitivity, affecting the homogenization and coating effect of lithium titanate materials, etc.

Active Publication Date: 2017-02-22
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium titanate materials are sensitive to environmental humidity. Open handling, storage, homogenization, and coating will cause the raw materials to quickly absorb moisture in the environment, thereby affecting the homogenization and coating of lithium titanate materials. Effect

Method used

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  • Homogenate coating method for negative lithium titanate and method for preparing lithium ion battery with negative lithium titanate
  • Homogenate coating method for negative lithium titanate and method for preparing lithium ion battery with negative lithium titanate
  • Homogenate coating method for negative lithium titanate and method for preparing lithium ion battery with negative lithium titanate

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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, ...

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Abstract

The invention provides a homogenate coating method for negative lithium titanate. The method comprises the following steps: a, connecting a material storage box, a homogenate tank and a coating chamber into integrated homogenate coating equipment by virtue of a conveying pipeline; b, controlling the humidity in the material storage box and the homogenate tank to be in a range of 0-10% RH; c, adding a homogenate solvent and a negative electrode material into the material storage box, and controlling the humidity in the material storage box to be in a range of 0-10% RH; d, guiding the homogenate solvent and the negative electrode material into the homogenate tank for stirring; e, checking the solid content, viscosity and fineness of the homogenate, and preparing for discharging and coating; f, controlling the ambient humidity of the coating chamber to be 0-30% RH, starting to coat, and baking to obtain a negative plate coil. According to the homogenate coating method provided by the invention, a phenomenon that moisture in a lithium titanate homogenate absorbing environment is in a gel state in the homogenate coating process is eliminated, a gas expansion problem of a lithium titanate battery is reduced to a certain degree, and the electrical properties of the battery are improved.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/131H01M4/1391H01M4/04H01M10/0525H01M10/0587
CPCH01M4/0404H01M4/131H01M4/1391H01M4/485H01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 邢丽英范少聪赵祥彬王驰伟从长杰冯树南
Owner TIANJIN ENERGIES
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