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A kind of negative electrode material, its preparation method and obtained negative electrode pole piece and lithium ion battery

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, secondary batteries, electrode manufacturing, etc., can solve the problems of reducing battery life, consuming heating energy, reducing system energy density, etc., to improve low-temperature charging performance, The effect of reducing negative impedance and improving safety

Active Publication Date: 2021-06-01
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heating system includes battery management unit, off-board charger, heater and fan, etc., which reduces the energy density of the system and needs to consume its own heating energy, which further reduces the battery life.

Method used

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  • A kind of negative electrode material, its preparation method and obtained negative electrode pole piece and lithium ion battery
  • A kind of negative electrode material, its preparation method and obtained negative electrode pole piece and lithium ion battery
  • A kind of negative electrode material, its preparation method and obtained negative electrode pole piece and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) drop into the scaly graphite of D50=5 μm and the furfurone resin hard carbon of D50=10 μm with the mass ratio of 9:1 in the mixing tank of double planetary mixer, with revolution speed 50r / min, rotation speed 1500r / min, After dispersing for 1 hour, a hard carbon-graphite composite negative electrode material was obtained;

[0054] (2) Add the composite negative electrode material, binder SBR, thickener CMC and conductive agent SP described in step (1) sequentially to the mixing tank with a mass ratio of 94:2:2:2, stir and disperse for 1 hour, and then add Add solvent deionized water of the same quality as the powder, and stir for 6 hours to obtain a hard carbon-graphite composite negative electrode slurry;

[0055] (3) Apply the above-mentioned composite negative electrode slurry evenly on the copper foil, and after drying in the oven, go through a cold press, die-cutting, and slitting to make a negative electrode sheet, and the surface density of the electrode shee...

Embodiment 2

[0059] (1) Put artificial graphite of D50=10 μm and acrylic resin hard carbon of D50=15 μm into the mixing tank of the planetary mixer with a mass ratio of 7.5:2.5, with a revolution speed of 30r / min and a rotation speed of 3000r / min, after dispersing for 3 hours , to obtain a hard carbon-graphite composite negative electrode material;

[0060] (2) Add the composite negative electrode material, binder SBR, thickener CMC and conductive agent SP described in step (1) sequentially to the mixing tank with a mass ratio of 94:2:2:2, stir and disperse for 1 hour, and then add Add solvent deionized water of the same quality as the powder, and stir for 6 hours to obtain a hard carbon-graphite composite negative electrode slurry;

[0061] (3) Evenly coat the above-mentioned composite negative electrode slurry on the copper foil, and after drying in the oven, go through a cold press, die-cutting, and stripping to make negative electrode sheets, and the surface density of the electrode sh...

Embodiment 3

[0064] (1) Drop into the natural aphanitic graphite of D50=15 μm and the epoxy resin hard carbon of D50=20 μm with the mass ratio of 5:5 in the mixing cylinder of planetary mixer, with revolution speed 10r / min, rotation speed 200r / min , after dispersing for 5 hours, a hard carbon-graphite composite negative electrode material was obtained;

[0065] (2) Add the composite negative electrode material, binder SBR, thickener CMC and conductive agent SP described in step (1) sequentially to the mixing tank with a mass ratio of 94:2:2:2, stir and disperse for 1 hour, and then add Add solvent deionized water of the same quality as the powder, and stir for 6 hours to obtain a hard carbon-graphite composite negative electrode slurry;

[0066] (3) Evenly coat the above-mentioned composite negative electrode slurry on the copper foil, and after drying in the oven, go through a cold press, die-cutting, and stripping to make negative electrode sheets, and the surface density of the electrod...

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Abstract

The invention discloses a negative electrode material, a preparation method thereof, a prepared negative electrode pole piece and a lithium ion battery. The negative electrode material includes graphite and hard carbon, and the particle size of the graphite is

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a negative electrode material, a preparation method thereof, and a prepared negative electrode sheet and a lithium ion battery. Background technique [0002] Driven by policies and markets, new energy electric vehicles are gradually becoming popular in my country. In 2018, the production and sales of new energy electric vehicles have reached 1.27 million and 1.256 million. Among the top ten sales cities, seven belong to the southern region. Various data show that the penetration rate of new energy vehicles in the southern region is much higher than that in the northern region. This is mainly because the winter temperature in northern my country is basically below 0°C, and the lowest temperature from December to February in the three northeastern provinces and Inner Mongolia even reached -40°C. The low temperature reduces the migration rate of lithium ions i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/04H01M4/133H01M10/0567H01M10/0525H01M10/42
CPCH01M4/04H01M4/133H01M4/364H01M4/587H01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 姜倩荣沈舒宜崔亚青吕正中刘金成
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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