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Lithium ion battery negative pole size and preparation method thereof

A lithium-ion battery and negative electrode slurry technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of materials and current collectors falling off, poor material cycle performance, etc., and achieve good rate performance and cycle performance, high ratio Effects of capacity, excellent electronic conductivity and chemical stability

Inactive Publication Date: 2016-03-16
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Silicon-carbon composite materials have a high specific capacity, but under high-level deintercalation conditions, there is a volume effect, which leads to the shedding of the material and the current collector during the charge and discharge process, and the material cycle performance is poor.

Method used

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  • Lithium ion battery negative pole size and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment

[0023] First, mix 1.650±0.005kg of CMC and 6.600±0.005kg of NMP into a 200L planetary mixer and stir slowly for 20min, with a revolution speed of 5r / min and an autorotation speed of 0r / min. After the stirring is completed, add 126.000±0.005kg of deionized water Stir at high speed for 90 minutes, revolution speed 20r / min, rotation speed 1000r / min, after the CMC solution is stirred, pass through a 200-mesh sieve and let stand for 12 hours;

[0024] Then mix 1.000±0.005kg Super-p and 122.000±0.005kg CMC solution into a 200L planetary mixer and stir for 120min at high speed, revolution speed 20r / min, rotation speed 1000r / min, then add 95.000±0.005kg layered graphdiyne negative electrode active material Stir at high speed for 120min, revolution speed 20r / min, rotation speed 1500r / min, then add 5.000±0.005kgSBR high speed stirring for 90min, revolution speed 20r / min, rotation speed 1500r / min;

[0025] Finally, 1.000±0.005kg of deionized water was added and stirred to adjust the visc...

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Abstract

The invention discloses lithium ion battery negative pole size which consist of graphdiyne, Super-p, CMC, SBR, NMP and deionized water, wherein the mass ratio of the graphdiyne to the Super-p to the CMC to the SBR solution (the solid content is 50%) to the NMP to the deionized water is 95: (0.8-2): (1.0-2): (4-7): (5-8): (110-120). The preparation method of the lithium ion battery negative pole size comprises the following steps: mixing the CMC and the NMP at a low speed; adding the deionized water to evenly mix at a high speed; screening the CMC solution through a 200-mesh screen to stand for 8-12h; evenly mixing the Super-p and the CMC xolution at a high speed; adding the graphdiyne and the SBR in sequence to evenly mixing at a high speed; and finally adjusting the viscosity and screening through a 150-200-mesh screen to obtain the lithium ion battery negative pole size which is good in performance.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a negative electrode slurry of a lithium ion sub-battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have high energy density, good cycle performance, rate performance and safety performance, and are environmentally friendly. They are the main energy products in the electronics and power fields. With the rapid development of electronic technology, electronic and power products are becoming more and more miniaturized and lightweight, and require faster charging speeds and can withstand high power, all of which put forward more stringent requirements for the performance of lithium-ion batteries , Li-ion batteries are required to have higher energy density and power density. [0003] As the main component of lithium-ion batteries, the negative electrode plays an important role in the performance of lithium-ion batteries. Traditional...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/62H01M4/1393H01M10/0525
CPCH01M4/1393H01M4/5835H01M4/621H01M4/625H01M10/0525Y02E60/10
Inventor 关成善宗继月张敬捧王勇李涛
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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