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Negative electrode material, negative electrode slurry, battery cell, fast charging battery and preparation method thereof

A negative electrode material and negative electrode slurry technology, which is applied in negative electrodes, battery electrodes, secondary batteries, etc., can solve problems such as poor kinetic performance, uneven distribution, and uneven current density distribution

Pending Publication Date: 2021-10-19
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a negative electrode material, a negative electrode slurry, a battery cell, a fast charging battery and a preparation method thereof. By adding a solid electrolyte, the solid electrolyte and hard carbon are blended in artificial graphite, and the solid electrolyte and hard carbon are mixed in artificial graphite, and the solid electrolyte and the hard carbon are mixed with different particle sizes. The mixture of materials prepares a porous negative electrode dressing area, which improves the problem of severe change in porosity and uneven distribution of the traditional artificial graphite negative electrode after rolling, resulting in uneven distribution of current density and poor dynamic performance.

Method used

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  • Negative electrode material, negative electrode slurry, battery cell, fast charging battery and preparation method thereof
  • Negative electrode material, negative electrode slurry, battery cell, fast charging battery and preparation method thereof

Examples

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preparation example Construction

[0049] A preparation method for a fast charging battery, comprising the steps of:

[0050] a, preparing positive electrode sheet 2, separator 1 and negative electrode sheet 3;

[0051] b. Stack the positive electrode sheet 2, the separator 1 and the negative electrode sheet 3 in sequence, and use a laminated structure to make a cell;

[0052] c. Weld the positive pole lug on the positive pole piece 2, and weld the negative pole pole lug on the negative pole piece 3;

[0053] d. Put the battery cell prepared in step b into the casing, perform ultrasonic welding, electrolyte injection, formation and volume separation in sequence to obtain a fast charging battery.

[0054] Specifically, the preparation of the negative electrode sheet 3 in step a includes the following steps:

[0055] A1, add deionized water in the stirrer;

[0056] A2. Add the first binder and stir until the first binder is completely dissolved; the first binder is preferably PVDF, 6020, etc.;

[0057] A3. Ad...

Embodiment 1

[0075] In this embodiment, in the positive electrode slurry, the weight ratio of the positive electrode active material, the fourth binder and the second conductive agent is 96.5%: 1.3%: 2.2%, wherein the fourth binder uses PVDF, and the second conductive agent The agent adopts SP. In the negative electrode slurry, the weight ratio of the negative electrode active material, the first binder and the first conductive agent is 96%: 2.5%: 1.5%, wherein the first binder uses PVDF, the first conductive agent uses SP, and the negative electrode The weight ratio of the hard carbon in the active material is 25%, and the inorganic solid electrolyte is 5% of the weight of the hard carbon. The weight ratio of the lithium salt in the first diaphragm coating 12 is 97%, the weight ratio of the binding agent is 3%, and the weight ratio of the inorganic solid electrolyte (lithium lanthanum zirconium oxide) in the second diaphragm coating 13 is 97%. The weight ratio of binder is 3%.

Embodiment 2

[0077] In this embodiment, the difference from Embodiment 1 is that in the positive electrode slurry, the weight ratio of the positive electrode active material, the fourth binder and the second conductive agent is 97%:1.0%:2.0%. In the negative electrode slurry, the weight ratio of the negative electrode active material, the first binding agent and the first conductive agent is 98.5%: 1.0%: 0.5%, the weight ratio of hard carbon in the negative electrode active material is 50%, and the inorganic solid electrolyte is hard carbon. 10% by weight of carbon. The weight ratio of the lithium salt in the first diaphragm coating 12 is 98%, the weight ratio of the binding agent is 2%, and the weight ratio of the inorganic solid electrolyte (aluminum lithium germanium phosphorus) in the second diaphragm coating 13 is 98%, and the adhesive The weight ratio of binder is 2%.

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Abstract

The invention discloses a negative electrode material, negative electrode slurry, a battery cell, a fast charging battery and a preparation method thereof, and belongs to the field of lithium ion batteries. The negative electrode material comprises a negative electrode active material and an inorganic solid electrolyte, the negative electrode active material comprises hard carbon and artificial graphite which are mixed, the weight ratio of the hard carbon in the negative electrode active material is 10-90%, and the content of the inorganic solid electrolyte is 2-10% of the weight of the hard carbon. A porous negative electrode dressing area is prepared by adding the solid electrolyte, mixing the solid electrolyte with hard carbon in the artificial graphite and mixing materials with different particle sizes, so that the problems of non-uniform current density distribution and poor dynamic performance caused by violent change of the porosity of a pole piece and non-uniform pore distribution after rolling of a traditional artificial graphite negative electrode are solved. The hard carbon material is a porous material, and through combination with the graphite and the solid electrolyte, the pore structure distribution is more uniform.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a negative electrode material, a negative electrode slurry, a battery cell, a fast-charge battery and a preparation method thereof. Background technique [0002] With the energy crisis brought about by the excessive development and utilization of fossil fuels, various metal-ion secondary batteries, especially lithium-ion secondary batteries, have gradually become the The most promising energy storage technology in the field of new energy. [0003] In recent years, with the rapid development of lithium-ion battery technology, the energy density of the battery has been greatly improved. At the same time, the demand for shortening the charging time in the power battery market and the consumer electronics market is increasing. An important trend in the development of lithium-ion battery technology. During the charging process, Li+ is released from the positive electrode a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/587H01M4/62H01M10/0525H01M10/0562
CPCH01M4/587H01M4/624H01M10/0525H01M10/0562H01M4/133H01M4/1393H01M2004/027Y02E60/10
Inventor 许晓雄魏引利刘远丁超
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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