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Lithium ion battery positive electrode plate added with lithium peroxide, and preparation method thereof

A lithium-ion battery, lithium peroxide technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as large consumption of positive lithium ions, irreversible capacity loss, aggravation of irreversible capacity, etc., to make up for consumption and increase capacity. Effect

Inactive Publication Date: 2019-04-19
SUZHOU YOULION BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the first charging process, the SEI film formed on the side of the negative electrode will consume a large amount of positive lithium ions, resulting in a loss of irreversible capacity, and if the material used for the negative electrode is higher capacity silicon If the negative electrode is used, it will aggravate the loss of irreversible capacity

Method used

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  • Lithium ion battery positive electrode plate added with lithium peroxide, and preparation method thereof
  • Lithium ion battery positive electrode plate added with lithium peroxide, and preparation method thereof
  • Lithium ion battery positive electrode plate added with lithium peroxide, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] Lithium peroxide (Li 2 o 2 ), conductive additive (Sp), and binder (PVDF) were added to the NMP solvent at a time according to the mass ratio of 80:10:10, and dispersed uniformly to form a uniform slurry; the slurry was coated on aluminum foil and placed in a vacuum oven at 85°C Dry in medium for 6 hours to obtain lithium peroxide pole piece.

[0033] Alternative scheme: Lithium peroxide (Li 2 o 2 ), conductive additive (Sp), and binder (PVDF) were added to the NMP solvent at a time according to the mass ratio of 70:15:15, and dispersed evenly to form a uniform slurry; the slurry was coated on the aluminum foil and placed in a vacuum oven at 85°C Dry in medium for 6 hours to obtain lithium peroxide pole piece.

Embodiment 2

[0035] Lithium iron phosphate (LiFePO 4 ), Li 2 o 2 According to the ratio of 99:1, add in the mixing machine full of nitrogen, adjust the mixing machine speed to be 600 rpm, mix for 20 minutes to obtain composite positive electrode material a; composite positive electrode material a, conductive additive (Sp), binder (PVDF) was added to the NMP solvent at a mass ratio of 80:10:10, dispersed evenly to form a uniform slurry; the slurry was coated on an aluminum foil, and dried in a vacuum oven at 85°C for 6 hours to obtain 2 o 2 Additive LiFePO 4 Composite pole piece A.

[0036] Alternative solution: add composite positive electrode material a, conductive additive (Sp), and binder (PVDF) into NMP solvent at a mass ratio of 70:15:15, and disperse evenly to form a uniform slurry; coat the slurry Dry on aluminum foil in a vacuum oven at 85°C for 6 hours to obtain 2 o 2 Additive LiFePO 4 Composite pole piece A.

Embodiment 3

[0038] Lithium cobalt oxide (LiCoO 2 ), Li 2 o 2 According to the ratio of 97.5: 2.5, add in the mixing machine that is full of nitrogen, adjust the mixing machine speed at 800 rpm, mix for 20 minutes to obtain composite positive electrode material b; composite positive electrode material b, conductive additive (Sp), binding agent (PVDF) was added to the NMP solvent at a mass ratio of 80:10:10, dispersed evenly to form a uniform slurry; the slurry was coated on an aluminum foil, and dried in a vacuum oven at 85°C for 8 hours to obtain a Li 2 o 2 Additive LiCoO 2 Composite pole piece B.

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Abstract

The invention provides a lithium ion battery positive electrode plate added with lithium peroxide. The lithium ion battery positive electrode plate comprises the following components by weight: 70-80%of lithium peroxide, 10-15% of conductive additive, and 10-15% of binder. The invention further provides another lithium ion battery positive electrode plate added with lithium peroxide. The lithiumion battery positive electrode plate is characterized by comprising the following components by weight: 70-80% of composite positive electrode material, 10-15% of conductive additive, and 10-15% of binder, wherein the composite positive electrode material comprises a positive electrode material and lithium peroxide, and the weight percentage between the positive electrode material and the lithiumperoxide is: 90-99% of the positive electrode material, and 1-10% of lithium peroxide. The invention further provides a preparation method of the lithium ion battery positive electrode plate added with lithium peroxide. Compared with the prior art, the lithium ion battery positive electrode plate can effectively compensate for the consumption of lithium ions of the positive electrode material andincrease the capacity of the battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery positive plate added with lithium peroxide and a preparation method thereof. Background technique [0002] Since the first lithium-ion battery appeared in 1970, lithium-ion batteries have been favored by researchers at home and abroad. Among them, the cathode material is an important part of the lithium-ion battery, and the lithium in the current lithium-ion battery is mainly derived from this cathode material. [0003] However, during the first charging process, the SEI film formed on the side of the negative electrode will consume a large amount of positive lithium ions, resulting in a loss of irreversible capacity, and if the material used for the negative electrode is higher capacity silicon If the negative electrode is used, it will aggravate the loss of irreversible capacity. Contents of the invention [0004] In view of this, the present inven...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/04H01M10/0525
CPCH01M4/0404H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/362H01M4/505H01M4/525H01M4/5825H01M4/62H01M10/0525Y02E60/10
Inventor 唐其伟王丽刘贯东毛焕宇
Owner SUZHOU YOULION BATTERY INC
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