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Power battery negative electrode material and preparation method thereof

A power battery and negative electrode material technology, applied in battery electrodes, lead-acid battery electrodes, negative electrodes, etc., can solve the problems of consistency, poor low temperature capacity and high temperature resistance, salinization of lead sulfate, agglomeration and uneven distribution, etc., to achieve improvement Effect of low temperature capacity performance

Inactive Publication Date: 2020-06-23
浙江埃登达新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The defect of the traditional paste machine mixing method is that the components are not mixed uniformly. Compounds such as barium sulfate and lead powder are heavy, lignin is light, and carbon black is lighter. Carbon black is mixed into the mixture, resulting in serious agglomeration and uneven distribution, causing black lines to appear when the mold forming scraper is scraped, and the nucleating agent barium sulfate of about several microns cannot be dispersed and distributed by the undispersed lignin , leading to the nucleation of barium sulfate can not play well, lead sulfate salinization serious
This leads to poor consistency of the negative electrode of the lead-acid battery, poor cycle charge and discharge consistency, low-temperature capacity, and high-temperature resistance of the entire lead-acid battery product, and the final battery life is not long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Preparation of Power Battery Negative Electrode Material

[0027] Raw material ratio: taking the weight of lead powder as the measurement basis, the weight and dosage of each component are: dilute sulfuric acid (1.40g / mL) 10%, water 12%, sodium lignosulfonate 0.3%, humic acid 0.3%, charcoal Black 0.3%, barium sulfate 0.9%;

[0028] Preparation:

[0029] (1) Sodium lignosulfonate, humic acid, carbon black and barium sulfate were mixed in a horizontal coulter mixer for 30 minutes to obtain the negative electrode package mixture;

[0030] (2) Carry out ball milling 30min in ball mill to negative electrode package mixture to obtain ball milled negative electrode package; The inner wall material of described ball mill is 304 stainless steel material; The volume filling rate of grinding medium in the ball mill is 45%; The grinding medium in the ball mill selects three kinds Metal balls of different sizes and metal oxide ceramic balls are graded; respectively, 304 ...

Embodiment 2

[0032] Example 2 Preparation of Power Battery Negative Electrode Material

[0033] Raw material ratio: taking the weight of lead powder as the measurement basis, the weight and dosage of each component are: dilute sulfuric acid (1.40g / mL) 12%, water 10%, sodium lignosulfonate 0.5%, humic acid 0.5%, charcoal Black 0.5%, barium sulfate 1.5%;

[0034] Preparation:

[0035] (1) Sodium lignosulfonate, humic acid, carbon black and barium sulfate were mixed in a horizontal coulter mixer for 60 minutes to obtain the negative electrode package mixture;

[0036] (2) Carry out the ball milling negative electrode bag mixture in the ball mill for 60min to obtain the ball milled negative electrode bag; the inner wall material of the ball mill is 304 stainless steel; the volume filling rate of the grinding medium in the ball mill is 30%; the grinding medium in the ball mill is selected from three kinds Metal balls of different sizes and metal oxide ceramic balls are graded; respectively, 3...

Embodiment 3

[0038] Example 3 Preparation of Power Battery Negative Electrode Material

[0039] Raw material ratio: taking the weight of lead powder as the measurement basis, the weight and dosage of each component are: dilute sulfuric acid (1.40g / mL) 8%, water 15%, sodium lignosulfonate 0.1%, humic acid 0.1%, charcoal Black 0.1%, barium sulfate 0.5%;

[0040] Preparation:

[0041] (1) Sodium lignosulfonate, humic acid, carbon black and barium sulfate were mixed in a horizontal coulter mixer for 30 minutes to obtain the negative electrode package mixture;

[0042] (2) Carry out ball milling 60min in ball mill to negative electrode bag mixture to obtain ball milled negative electrode bag; The inner wall material of described ball mill is 304 stainless steel material; The volume filling rate of grinding medium in ball mill is 60%; The grinding medium in ball mill selects three kinds Metal balls of different sizes and metal oxide ceramic balls are graded; respectively, 304 stainless steel bal...

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Abstract

The invention relates to the technical field of battery preparation, and particularly discloses a power battery negative electrode material and a preparation method thereof. The power battery negativeelectrode material comprises lead powder, dilute sulfuric acid, water, sodium lignosulfonate, humic acid, carbon black and barium sulfate. The preparation method comprises the steps of (1) mixing sodium lignosulfonate, humic acid, carbon black and barium sulfate to obtain a negative electrode package mixture; (2) carrying out ball milling on the negative electrode package mixture for 5-60 minutesto obtain a ball-milled negative electrode package; and (3) mixing the ball-milled negative electrode package with lead powder, dilute sulfuric acid and water, and adding the mixture into a paste mixing machine for paste mixing to obtain the power battery negative electrode material. According to the power battery negative electrode material prepared by the method disclosed by the invention, components in the raw material lead powder and the ball-milled negative electrode package can be fully dispersed, so that the low-temperature capacity performance of the power battery is improved.

Description

technical field [0001] The invention relates to the technical field of battery material preparation, in particular to a power battery negative electrode material and a preparation method thereof. Background technique [0002] Power batteries provide power for tools such as electric vehicles; lead-acid batteries are one of the commonly used power batteries, and lead-acid batteries include positive electrodes, negative electrodes, diaphragms, and electrolytes. Among them, the negative electrode of lead-acid battery is a lead plate filled with spongy lead. The negative electrode material of lead-acid battery generally contains lead powder, sodium lignosulfonate (dispersant), barium sulfate (nucleating agent), carbon black (conductive material), etc. Components, the traditional lead-acid battery negative electrode, these components and water, sulfuric acid, etc. are added at one time to the paste machine (horizontal low-speed stirring mixer) to neutralize the paste to form the n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/16H01M4/36H01M4/57H01M10/06
CPCH01M4/16H01M4/362H01M4/57H01M10/06H01M2004/027Y02E60/10
Inventor 李志斌
Owner 浙江埃登达新能源材料有限公司