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A lithium ion battery negative electrode plate and a modification process thereof

A technology for lithium ion batteries and battery negative electrodes, which is applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as the safety of negative electrode lithium dendrites, and achieve the effects of easy process control, low production cost, and prevention of internal short circuits in batteries.

Inactive Publication Date: 2018-12-18
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention proposes a lithium-ion battery negative plate and its modification process, aiming to solve the safety problems caused by the growth of negative lithium dendrites in existing lithium-ion batteries

Method used

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  • A lithium ion battery negative electrode plate and a modification process thereof
  • A lithium ion battery negative electrode plate and a modification process thereof
  • A lithium ion battery negative electrode plate and a modification process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Take 10gα-Al 2 o 3 Powder, 0.8g of PVDF aqueous solution with a mass fraction of 5% and 2.375g of deionized water were mixed to form a slurry. The slurry is uniformly coated on the surface of the graphite negative electrode sheet by spraying, and the thickness is controlled at about (1-3) μm, and then the coated battery electrode sheet is placed in a room with a temperature of 40°C and a humidity of 60%. Ambient dry for 8 hours. Finally, the coated battery pole piece was dried in vacuum at 70°C for 6 hours to obtain a surface coated with α-Al 2 o 3 The graphite negative electrode sheet, such as Figure 1b As shown, it can be seen that α-Al 2 o 3 Uniformly coated on the surface of the graphite negative electrode sheet.

Embodiment 2

[0022] Take 5gα-Al 2 o 3 Powder and γ-Al 2 o 3 The powder mixture, 0.8g of 2% PVDF aqueous solution and 2.5g of deionized water were mixed to form a slurry. By spraying, the slurry is evenly coated on the surface of the graphite negative electrode sheet, and the thickness is controlled at about (3-5) μm, and then the coated battery electrode sheet is placed in a room with a temperature of 10°C and a humidity of 10%. Ambient dry for 4 hours. Finally, the coated battery pole piece was dried in vacuum at 60°C for 4 hours to obtain a surface coated with α-Al 2 o 3 and γ-Al 2 o 3 powder graphite negative electrode sheet.

Embodiment 3

[0024] Take 5g ZrO 2 Powder, 0.1 g of 10% PVDF aqueous solution and 1 g of deionized water were mixed to form a slurry. By spraying, the slurry is evenly coated on the surface of the graphite negative electrode sheet, and the thickness is controlled at about (4-6) μm, and then the coated battery electrode sheet is placed in a room with a temperature of 60°C and a humidity of 20%. Ambient drying for 10 hours. Finally, the coated battery pole piece was dried in vacuum at 80°C for 6 hours to obtain a surface coated with ZrO 2 graphite negative electrode sheet.

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Abstract

The invention provides a lithium ion battery negative electrode plate and a modification process thereof, wherein the battery negative electrode plate is coated with a layer of metal oxide with a thickness of (1-10) [mu]m, and the metal oxide is one or more of [alpha]-Al2O3, [gamma]- Al2O3, SiO2, Ga2O3, ZrO2, and TiO2. As the metal oxide with bet thermal stability and electrochemical performance is coated on the negative electrode plate of the battery, the environment on the surface of the negative electrode plate of the battery is changed, the growth of lithium dendrite on the surface of thenegative electrode of the battery can be inhibited, and the safety problem of the internal short circuit of the battery caused by the directional growth of the lithium dendrite through the separator is effectively prevented; In addition, the negative plate of the modified battery has good machinability, good compatibility with the current battery process equipment, and can promote large-scale production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative plate and a modification process thereof. Background technique [0002] Lithium-ion batteries have always been considered as the battery with the most development potential due to their advantages such as high cell voltage, high energy density, high charge and discharge efficiency, and long cycle life. When a lithium battery is being charged, lithium ions will be reduced to form a dendritic metal lithium element, that is, lithium dendrites. During the charge and discharge process, lithium dendrites will continue to grow, which may pierce the separator and cause an internal short circuit in the battery, causing serious safety problems. In order to solve the growth problem of lithium dendrites, researchers at home and abroad have made a lot of improvements in the positive electrode, negative electrode, electrolyte and separator of lithi...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/133H01M4/04H01M4/1393H01M10/0525
CPCH01M4/0404H01M4/133H01M4/1393H01M4/628H01M10/0525Y02E60/10
Inventor 王绥军王献哲李松金翼刘伟李风雷
Owner CHINA ELECTRIC POWER RES INST
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