Preparation method of cathode slurry for aquo-lithium titanate dynamical type battery

A battery negative electrode and lithium titanate technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve pollution, serious problems, etc., and achieve the effects of broad prospects, low cost, and wide range of raw materials

Inactive Publication Date: 2013-01-02
青岛瀚博电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the process of preparing lithium titanate power battery negative electrode slurry, oily polyvinylidene fluoride PVDF binder is mostly used, and the pollution is relatively serious.

Method used

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  • Preparation method of cathode slurry for aquo-lithium titanate dynamical type battery

Examples

Experimental program
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Effect test

Embodiment 1

[0012] The raw materials were weighed according to the following mass percentages: conductive agent 13%, dispersant sodium methylcellulose 3%, binder styrene-butadiene latex 3%, active substance lithium titanate 81%; water accounted for 50% of the total weight of the above materials ; The conductive agent is conductive carbon black.

[0013] Add the weighed dispersant sodium methylcellulose to the above-mentioned water weighed, stir for 2h, and let it stand for 20h to obtain the mother liquor of sodium methylcellulose; add the weighed conductive carbon black to the mother liquor of sodium methylcellulose, and stir for 3h Then add the weighed active material lithium titanate, stir for 3 hours, and adjust the viscosity to 3000mPa·S; then add the weighed styrene-butadiene latex, and vacuumize and stir for 1 hour to obtain the aqueous lithium titanate power battery negative electrode slurry.

Embodiment 2

[0015] The raw materials were weighed according to the following mass percentages: conductive agent 1%, dispersant sodium methylcellulose 3%, binder styrene-butadiene latex 3%, active substance lithium titanate 93%; water accounted for 65% of the total weight of the above materials ; The conductive agent is composed of conductive carbon black and conductive graphite at a weight ratio of 1:1.

[0016] Add the weighed dispersant sodium methylcellulose to the water weighed above, stir for 6h, and let it stand for 24h to obtain the mother liquor of sodium methylcellulose; add the weighed conductive carbon black and conductive graphite to the mother liquor of sodium methylcellulose , stirred for 2 hours; then added the weighed active substance lithium titanate, stirred for 4 hours, and adjusted the viscosity to 3200mPa·S; then added the weighed styrene-butadiene latex, and stirred for 1 hour in a vacuum to obtain the aqueous lithium titanate power battery negative electrode slurry ...

Embodiment 3

[0018] The raw materials were weighed according to the following mass percentages: conductive agent 6%, dispersant sodium methylcellulose 5%, binder styrene-butadiene latex 5%, active substance lithium titanate 84%; water accounted for 60% of the total weight of the above materials ; The conductive agent is composed of carbon nanotubes and conductive graphite with a weight ratio of 1:1.

[0019] Add the weighed dispersant sodium methylcellulose to the above-mentioned weighed water, stir for 4 hours, and let it stand for 22 hours to obtain the sodium methylcellulose mother liquor; add the weighed carbon nanotubes to the sodium methylcellulose mother liquor and conductive graphite, stirred for 2.5 hours; then added the weighed active substance lithium titanate, stirred for 3.5 hours, and adjusted the viscosity to 3500mPa·S; Lithium-acid power battery negative electrode slurry.

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Abstract

The invention discloses a preparation method of a cathode slurry for an aquo-lithium titanate dynamical type battery. The method comprises the following steps: first, weighting raw materials according to the following mass percentage: 1-13% of a conductive agent, 1-5% of a dispersant sodium carboxymethyl cellulose, 2-5% of a binder styrene-butadiene latex, 81-93% of an active substance lithium titanate and water accounting for 50-65% of the total weight of the above materials; after the weighing, adding the dispersant sodium carboxymethyl cellulose into water, stirring for 2-6 h and shelving for 20-24h to obtain a sodium carboxymethyl cellulose mother liquor; then adding the conductive agent into the sodium carboxymethyl cellulose mother liquor, and stirring for 2-3 h; adding the active substance lithium titanate, stirring for 3-4 h, and adjusting viscosity; and finally adding the styrene-butadiene latex and stirring for 1-1.5h in vacuum to obtain the slurry. According to the invention, traditional PVDF is substituted by styrene-butadiene latex, so as to realize application of water-based binder as the cathode in lithium titanate; the invention has the advantages of no toxicity or pollution; besides, the aqueous binder solves the phenomenon of plate shedding caused by water absorption.

Description

technical field [0001] The invention relates to a lithium titanate power battery, in particular to a preparation method of a water-based lithium titanate power battery negative electrode slurry. Background technique [0002] Lithium titanate power battery is made by pulping, coating, sheet making, winding, liquid injection, formation, aging and testing processes. At present, in the process of preparing lithium titanate power battery negative electrode slurry, oily polyvinylidene fluoride PVDF binder is mostly used, and the pollution is relatively serious. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the present invention provides a method for preparing an aqueous lithium titanate power battery negative electrode slurry. [0004] Its technical solutions are: [0005] A method for preparing an aqueous lithium titanate power battery negative electrode slurry, comprising the following steps: [0006] a Weigh raw materials acco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/485
CPCY02E60/122Y02E60/10
Inventor 崔新伟刘成全王金枝刘海胜
Owner 青岛瀚博电子科技有限公司
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