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Positive plate of lithium ion battery, and preparation method and application thereof

A technology for lithium-ion batteries and positive plates, applied in battery electrodes, non-aqueous electrolyte battery electrodes, positive electrodes, etc., can solve safety problems, deteriorate battery stability, damage and other problems, achieve low DC resistance, and improve battery internal resistance , reduce the effect of side effects

Pending Publication Date: 2021-12-10
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The released oxygen will react with the electrolyte and destroy the stable CEI film between the positive electrode and the electrolyte, thereby deteriorating the stability of the battery and even causing safety problems

Method used

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  • Positive plate of lithium ion battery, and preparation method and application thereof
  • Positive plate of lithium ion battery, and preparation method and application thereof
  • Positive plate of lithium ion battery, and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0039] Another technical solution provides a method for preparing a positive electrode sheet of a lithium-ion battery, including the following steps: according to the solid-to-liquid ratio (0.1g-2g): 100mL, the carbon material is refluxed in a mixed acid composed of concentrated nitric acid and concentrated sulfuric acid. , to obtain a carboxylated carbon material; according to the solid-liquid ratio (0.1g~2g): 100mL, the carboxylated carbon material is refluxed in dichlorophenol to obtain an acyl chlorinated carbon material; according to the solid-liquid ratio ( 0.1g~1g): 100mL: 200mL, reflux reaction of acid chlorinated carbon material and ethylenediamine in anhydrous toluene to obtain amidated carbon material; dissolve amidated carbon material in water to form a dispersion; first The current collector is soaked in the dispersion, and then the current collector is immersed in the dispersion and Li 2 C 6 o 6 Alternate soaking in the solution and drying to obtain the positiv...

Embodiment 1

[0051] This embodiment provides a method for preparing a positive electrode sheet of a lithium-ion battery, wherein:

[0052] (1) The cathode material (LiNi 0.8 co 0.1 mn 0.1 o 2 ), conductive carbon black, conductive carbon tubes, nitrogen methyl pyrrolidone solvent and polyvinylidene fluoride according to the mass ratio of 99:1:0.5:40:1 to obtain the first main material layer 1 and the second main material Layer 2, the specific preparation method includes the following steps: first disperse and stir conductive carbon black, conductive carbon tubes, nitrogen methyl pyrrolidone solvent and polyvinylidene fluoride at a high speed for 2 hours at a mass ratio of 1:0.5:40:1 to prepare a conductive slurry , and then mix the positive electrode material and the conductive slurry at a high speed to prepare the first main material layer 1 and the second main material layer 2;

[0053] (2) The lithium-supplementing material (Li 5 FeO 4 ), conductive carbon black, conductive carbon...

Embodiment 2

[0057] This embodiment provides a method for preparing a positive electrode sheet of a lithium-ion battery, wherein:

[0058] (1) The cathode material (LiNi 0.8 co 0.1 mn 0.1 o 2 ), conductive carbon black, conductive carbon tubes, nitrogen methyl pyrrolidone solvent and polyvinylidene fluoride according to the mass ratio of 99:1:0.5:40:1 to obtain the first main material layer 1 and the second main material Layer 2, the specific preparation method includes the following steps: first disperse and stir conductive carbon black, conductive carbon tubes, nitrogen methyl pyrrolidone solvent and polyvinylidene fluoride at a high speed for 2 hours at a mass ratio of 1:0.5:40:1 to prepare a conductive slurry , and then mix the positive electrode material and the conductive slurry at a high speed to prepare the first main material layer 1 and the second main material layer 2;

[0059] (2) The lithium-supplementing material (Li 5 FeO 4 ), conductive carbon black, conductive carbon...

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Abstract

The invention provides a positive plate of a lithium ion battery, and a preparation method and application thereof. The positive plate comprises a pole piece body, a dressing layer is arranged on the surface of the pole piece body, and the dressing layer comprises a first main material layer, a lithium supplementing material layer and a second main material layer which are sequentially stacked along the surface of the pole piece body. In the invention, the prepared lithium ion battery can obtain high compaction and low direct-current resistance, reduce side reaction of the battery and improve long-term circulation and storage stability of the battery, which benefits from the three-layer structural design of the dressing layer, on one hand, direct contact between a lithium supplementing material and an electrolyte is reduced, and gas production in a subsequent process of the battery is reduced; on the other hand, the contact surface of the whole dressing layer and a foil is optimized, the direct-current resistance of the battery is reduced, the internal resistance of the battery is comprehensively improved, and the stability of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to the design of a positive electrode sheet, in particular to a positive electrode sheet of a lithium ion battery, a preparation method and application thereof. Background technique [0002] With the continuous development of electronic technology, the application of lithium-ion batteries is becoming more and more extensive. Based on market requirements, the longer the continuous working time of products using lithium-ion batteries, the better, which requires the lithium-ion batteries that provide electrical energy to have higher volumetric energy density. When designing a lithium-ion battery with high volumetric energy density, the areal density and compaction density of the positive and negative electrodes are both large. Silicon oxide composite graphite material (C-SiOx) is used in power battery systems with high energy density because of its high theoretical specifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/13H01M4/36H01M4/62H01M10/0525
CPCH01M4/02H01M4/13H01M4/366H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 莫方杰李昊李若楠孙化雨其他发明人请求不公开姓名
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD