Lithium ion battery positive electrode sheet, preparation method of lithium ion battery positive electrode sheet, and lithium ion battery

A technology for lithium-ion batteries and positive plates, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of unsatisfactory lithium supplementation effect, harsh operation requirements, capacity loss, etc., to reduce severity, The effect of low decomposition voltage and high energy density

Active Publication Date: 2017-02-08
湖南三迅新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the problems of capacity loss in the process of forming the SEI film in the existing lithium-ion secondary battery and the harsh operation requirements of the existing lithium supple...

Method used

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  • Lithium ion battery positive electrode sheet, preparation method of lithium ion battery positive electrode sheet, and lithium ion battery
  • Lithium ion battery positive electrode sheet, preparation method of lithium ion battery positive electrode sheet, and lithium ion battery
  • Lithium ion battery positive electrode sheet, preparation method of lithium ion battery positive electrode sheet, and lithium ion battery

Examples

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preparation example Construction

[0075] Another embodiment of the present invention also discloses a method for preparing a positive electrode sheet of a lithium ion battery, comprising the following steps:

[0076] Obtain the lithium supplement slurry; wherein, the lithium supplement slurry includes a reducing lithium compound, and the reducing lithium compound includes L-lithium ascorbate, D-lithium erythorbate, lithium metabisulfite, lithium sulfite and lithium phytate one or more of.

[0077] coating the lithium-replenishing slurry on at least one surface of the first current collector, and drying to form a lithium-replenishing layer;

[0078] Obtain positive electrode active slurry;

[0079] Coating the positive electrode active slurry on the surface of the lithium replenishing layer and drying to form the positive electrode active layer.

[0080] The operation of obtaining the lithium-supplementing slurry includes: dispersing the reducing lithium compound, the second conductive agent and the second bi...

Embodiment 1

[0098] This embodiment is used to illustrate a positive electrode sheet of a lithium-ion battery disclosed in the present invention, a preparation method thereof, and a lithium-ion battery.

[0099] 1. Preparation of lithium supplement layer

[0100] Disperse L-lithium ascorbate (commercially available), conductive carbon black (purchased from Switzerland Temego, the brand is super P) and polyvinylidene fluoride (purchased from Kynar, the brand is HSV900) in N-methylpyrrolidone to form Lithium supplement slurry. Among them, the weight ratio of L-ascorbate lithium: conductive carbon black: polyvinylidene fluoride is 70:20:10, and the solid content is 40%;

[0101] The lithium-supplementing slurry was coated on both sides of an aluminum foil (12 μm in thickness), and then dried at 100° C. for 5 minutes to form a lithium-supplementing layer on both sides of the aluminum foil (the single-layer thickness of the lithium-supplementing layer was 2 μm).

[0102] 2. Preparation of pos...

Embodiment 2

[0111] This embodiment is used to illustrate a positive electrode sheet of a lithium-ion battery disclosed in the present invention, its preparation method, and a lithium-ion battery, including most of the operating steps in Example 1, the difference being:

[0112] In the operation steps of the preparation of the lithium-replenishing layer: D-lithium erythorbate, conductive carbon black (purchased from Swiss Temigo, the brand is super P) and polyvinylidene fluoride (purchased from Kynar, the brand is HSV900) are dispersed In N-methylpyrrolidone, a lithium-supplementing slurry is formed. Among them, the weight ratio of D-lithium erythorbate: conductive carbon black: polyvinylidene fluoride is 70:20:10, and the solid content is 40%;

[0113] The lithium-supplementing slurry was coated on both sides of an aluminum foil (12 μm in thickness), and then dried at 100° C. for 5 minutes to form a lithium-supplementing layer on both sides of the aluminum foil (the single-layer thickness...

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Abstract

In order to solve the problems of capacity loss of the existing lithium ion secondary battery in the SEI film forming process and harsh operation requirements and poor lithium supplementing effect of the existing lithium supplementing mode, the invention provides a lithium ion battery positive electrode sheet, which comprises a first current collector, a lithium supplementing layer and a positive electrode active layer, wherein the lithium supplementing layer is positioned between the positive electrode active layer and the first current collector; the lithium supplementing layer also comprises reducing lithium compounds; the reducing lithium compounds comprise one or more of L-lithium ascorbate, D-lithium erythorbate, lithium pyrosulfite, lithium sulfite and lithium phytate. Meanwhile, the invention also discloses a preparation method of the positive electrode sheet and a lithium ion battery using the positive electrode sheet. By using the technical scheme, the lithium loss of the positive electrode active layer in the first charging and discharging process can be reduced; the energy density of the battery is increased.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery positive plate, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion secondary batteries have the characteristics of high specific energy, high cycle life, and low self-discharge. Since their commercialization in the 1990s, they have been widely used in consumer electronics such as mobile phones, tablet computers, and mobile power supplies. In recent years, with the deterioration of the atmospheric environment and the continuous improvement of people's awareness of environmental protection, lithium-ion secondary batteries have gradually been widely used in automobiles, energy storage and other fields. [0003] Generally, as positive and negative electrode active materials for lithium ion secondary batteries, materials capable of reversibly releasing and inserting lithium ions are selecte...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 玉正日冷陈伟施汉议梁世硕
Owner 湖南三迅新能源科技有限公司
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