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Lithium titanate battery cathode paste and preparation method thereof

A technology of lithium titanate battery and negative electrode slurry, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of particle agglomeration, high water absorption of materials, high viscosity of mixed materials, etc., to reduce particle agglomeration, optimize the addition method, The effect of reducing viscosity

Pending Publication Date: 2018-03-23
SHENZHEN BAK POWER BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a lithium titanate battery negative electrode slurry and its preparation method, aiming to solve the problems of easy particle agglomeration, high water absorption of materials and mixture viscosity in the homogenization process of the existing lithium titanate battery negative electrode slurry high problem

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  • Lithium titanate battery cathode paste and preparation method thereof
  • Lithium titanate battery cathode paste and preparation method thereof

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preparation example Construction

[0030] On the one hand, the embodiments of the present invention provide a method for preparing a lithium titanate battery negative electrode slurry, comprising the following steps:

[0031] S01. Provide the raw material formula of lithium titanate battery negative electrode slurry: negative electrode material, conductive agent, binder and N-methylpyrrolidone, and the weight of the negative electrode material, conductive agent, binder and N-methylpyrrolidone The parts are as follows: 100 parts of negative electrode material; 3-7 parts of conductive agent; 4-5 parts of binder; 80-160 parts of N-methylpyrrolidone;

[0032] S02. Mix the binder with 30-60 parts of the N-methylpyrrolidone, stir and mix at a low speed, increase the speed to a high speed, stir to form a slurry, vacuumize and stir at a low speed to prepare a glue;

[0033] S03. Stir and mix the negative electrode material and the conductive agent at a low speed under normal pressure, add the glue, 10-20 parts of the N...

Embodiment 1

[0058] A preparation method of lithium titanate battery negative electrode slurry, comprising the following steps:

[0059] S11. Provide the raw material formula of lithium titanate battery negative electrode slurry: negative electrode material, conductive agent, binder and N-methylpyrrolidone, wherein the ratio of negative electrode material to conductive agent and binder is 100:4:5, The conductive agent is Super P.

[0060] S12. All binders and 60% N-methylpyrrolidone (in all embodiments of the present invention, the amount of N-methylpyrrolidone is based on the total mass of the negative electrode material as 100% as a standard. As In the present embodiment 1, adding N-methylpyrrolidone whose mass is 60% of the total mass of the negative electrode material) is used to prepare glue under low-speed stirring, the revolution is increased from 20rpm to 35rpm, and the rotation is increased to 3000rpm after stirring for a period of time, and then pumping Stir under vacuum (-0.08M...

Embodiment 2

[0063] A preparation method of lithium titanate battery negative electrode slurry, comprising the following steps:

[0064] S21. Provide the raw material formula of lithium titanate battery negative electrode slurry: negative electrode material, conductive agent, binder and N-methylpyrrolidone, wherein the ratio of negative electrode material to conductive agent and binder is 100:3:5, The conductive agent is Ketjen black.

[0065] S22. Mix all the binders with 50% N-methylpyrrolidone to prepare glue under low-speed stirring, increase the revolution to 40rpm, increase the rotation to 3500rpm and stir for a period of time, then vacuumize and stir for 1h .

[0066] S23. Dry mix the negative electrode material lithium titanate with the conductive agent at low speed and normal pressure, add 30% glue solution, and add 20% N-methylpyrrolidone for wetting treatment, keep stirring for 1 hour; then add the remaining glue in three times Liquid, add 30% for the first time, add 20% each ...

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Abstract

The invention provides a preparation method of lithium titanate battery cathode paste. The method comprises the following steps: preparing a raw material formula of the lithium titanate battery cathode paste, wherein the raw material formula comprises 100 parts by weight of a cathode material, 3-7 parts by weight of a conducting agent, 4-5 parts by weight of an adhering agent, and 80-160 parts byweight of N-methyl pyrrolidone; mixing the adhering agent and 30-60 parts of N-methyl pyrrolidone; stirring at low speed in order to uniformly mix; increasing the speed to high speed; stirring to obtain a paste type product; vacuumizing; stirring at low speed; preparing a glue solution; stirring the cathode material and the conducting agent at low speed under normal pressure in order to uniformlymix; adding the glue solution and 10-20 parts of N-methyl pyrrolidone; moisturizing; adding the rest N-methyl pyrrolidone; stirring at high speed under negative pressure, thus obtaining the lithium titanate battery cathode paste.

Description

technical field [0001] The invention belongs to the technical field of pulping lithium titanate batteries, and in particular relates to a lithium titanate battery negative electrode slurry and a preparation method thereof. Background technique [0002] Lithium titanate anode material has excellent fast charging performance and cycle stability, and has broad prospects in the field of power batteries and energy storage in the future. At present, the lithium titanate produced industrially has a small particle size, the primary particle size is at the nanometer level, and the secondary particle size is also within 10 μm. The small particle size leads to the problem that lithium titanate is easy to agglomerate, and it is difficult to achieve good dispersion. When making the active slurry, it contains conductive agents, binders and other components with uneven particle size distribution, which further increases the difficulty of uniform dispersion. In addition, lithium titanate i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485
CPCH01M4/364H01M4/485Y02E60/10
Inventor 刘瑞龙宋华杰刘科
Owner SHENZHEN BAK POWER BATTERY CO LTD
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