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Quickly-charged lithium ion battery negative plate and preparation method thereof

A lithium-ion battery, fast charging technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as reduction, and achieve the effects of low temperature rise, battery temperature rise control, and improved liquid absorption capacity

Active Publication Date: 2019-11-22
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the results showed that the modification process inevitably caused the reduction of other properties, such as cycle performance and safety performance, etc.

Method used

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  • Quickly-charged lithium ion battery negative plate and preparation method thereof
  • Quickly-charged lithium ion battery negative plate and preparation method thereof
  • Quickly-charged lithium ion battery negative plate and preparation method thereof

Examples

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Effect test

preparation example Construction

[0047] In a second aspect, the present invention also provides a method for preparing the negative electrode sheet of the above-mentioned fast-charging lithium-ion battery, comprising the steps of:

[0048] S1. Add 70-75 parts of deionized water and 1-2 parts of thickener into the blender, stir until the thickener is fully dissolved, remove air bubbles in a vacuum, and prepare glue for use;

[0049] S2. Stir 70-73 parts of the first artificial graphite, 21-25 parts of the second artificial graphite, and 1-2 parts of conductive agent to obtain powder;

[0050] S3. Add 20% of the total mass of the glue prepared in step S1 to the above powder, and stir until the powder is dispersed into granules;

[0051] S4. Add 50% of the total mass of the glue prepared in step S1 to the slurry prepared in step S3, and stir until the particles are kneaded with each other;

[0052] S5. Add 30% of the glue solution gross mass that step S1 makes to the slurry that step S4 makes, stir;

[0053] S...

Embodiment 1

[0063] A lithium-ion battery negative electrode sheet for rapid charging, the preparation method of which comprises the steps of:

[0064] S1. Add 72 parts of deionized water and 1.5 parts of thickener to a planetary mixer with a volume of 60L, stir at a revolution speed of 35rpm for 150 minutes until the thickener is fully dissolved, and remove air bubbles under a vacuum of less than -0.08 Mpa After 30 minutes, the glue solution was prepared and set aside;

[0065] S2. Add 71 parts of the first artificial graphite, 23 parts of the second artificial graphite, and 1.6 parts of conductive agent into a planetary mixer with a volume of 60 L, and stir for 30 minutes at a revolution speed of 20 rpm and a rotation speed of 200 rpm to obtain a uniformly mixed powder. Material; wherein, the particle diameter D50 of the first artificial graphite is 7 μm, and the particle diameter D50 of the second artificial graphite is 11 μm;

[0066] S3. Add 20% of the total mass of the glue prepared...

Embodiment 2

[0073] A lithium-ion battery negative electrode sheet for rapid charging, the preparation method of which comprises the steps of:

[0074] S1. Add 70 parts of deionized water and 1 part of thickener to a planetary mixer with a volume of 60L, stir at a revolution speed of 35rpm for 150 minutes until the thickener is fully dissolved, and remove air bubbles under a vacuum of less than -0.08 Mpa After 30 minutes, the glue solution was prepared and set aside;

[0075] S2. Add 70 parts of the first artificial graphite, 21 parts of the second artificial graphite, and 1 part of conductive agent into a planetary mixer with a volume of 60 L, stir for 30 minutes at a revolution speed of 20 rpm and a rotation speed of 200 rpm to obtain a uniformly mixed powder Material; wherein, the particle diameter D50 of the first artificial graphite is 6 μm, and the particle diameter D50 of the second artificial graphite is 10 μm;

[0076] S3. Add 20% of the total mass of the glue prepared in step S1...

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Abstract

The invention discloses a quickly-charged lithium ion battery negative plate and a preparation method thereof, so that a lithium ion battery has quick charging performance of 4C or above, and is low in temperature rise and excellent in cycle performance. The lithium ion battery negative plate comprises a current collector; the current collector is coated with negative electrode slurry, the negative electrode slurry comprises a negative electrode active material, and the negative electrode active material is first artificial graphite and second artificial graphite; the particle size D50 of thefirst artificial graphite is 6-8 [mu] m, and the particle size D50 of the second artificial graphite is 10-12 [mu] m; the mass ratio of the first artificial graphite to the second artificial graphiteis (70-73): (21-25); the coating surface density of the negative electrode slurry is 160-170g / m < 2 >, and the compaction density of the negative electrode slurry is 1-2g / cm < 3 >.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a fast-charging lithium-ion battery negative electrode sheet and a preparation method thereof. Background technique [0002] With the rapid development of portable electronic products and electric vehicles, the market places higher requirements on the fast charging capability of lithium-ion batteries. At present, commercial lithium-ion batteries can only be charged at 0.5C or 0.2C, and the charging time is 2 hours or even more than 5 hours. The charging time is too long, which limits its use. With the acceleration of people's life, more and more users hope that lithium-ion batteries can be fully charged in a shorter time, and then solve people's battery life anxiety from the perspective of fast charging. [0003] When the existing lithium-ion battery is charged above 2C, lithium ions will be enriched on the surface of the negative electrode to form lithium metal, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/133H01M4/1393H01M4/04H01M10/0525
CPCH01M4/364H01M4/583H01M4/133H01M4/1393H01M4/0404H01M4/043H01M10/0525Y02E60/10
Inventor 刘远洲孙鸿飞余灵超潘启明时洪玲曹珍张政张雪珍姚琦
Owner SHENZHEN BAK POWER BATTERY CO LTD
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