Positive electrode plate, negative electrode plate and high-rate rapid-charge lithium ion battery

A technology of lithium ion battery and positive pole piece, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of high battery temperature, battery capacity attenuation, abnormal battery heating, etc., to improve safety performance, The effect of reducing contact resistance and reducing internal resistance

Inactive Publication Date: 2019-07-26
长沙市秒冲电池技术与材料研究所
View PDF9 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the separator between the positive pole piece and the negative pole piece of the lithium-ion battery is mainly made of microporous membrane made of polypropylene, polyethylene or their copolymers, which is easy to shrink at high temperature, which may cause positive and negative Negative electrodes are in direct contact to form an internal short circuit; at the same time, during fast charging, if lithium ions cannot be quickly inserted into the negative electrode, it will also cause lithium precipitation. Severe lithium precipitation will lead to the formation of lithium dendrites, which may pierce the polymer microporous separator , causing an internal short circuit
A short circuit inside the battery will cause the batter

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Positive electrode plate, negative electrode plate and high-rate rapid-charge lithium ion battery
  • Positive electrode plate, negative electrode plate and high-rate rapid-charge lithium ion battery
  • Positive electrode plate, negative electrode plate and high-rate rapid-charge lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] a. Preparation of cathode current collector

[0129] A common aluminum foil with a thickness of 22 μm was used as the positive current collector.

[0130] b. Preparation of positive electrode active material coating

[0131] With N-dimethylpyrrolidone (NMP) as the solvent, the positive electrode active material is nickel-cobalt manganese oxide lithium (NCM) with an average particle size of 4.5 μm (gram capacity 170mAh / g), and the electronic conductive agent is conductive carbon black (SP), Conductive graphite (KS-6), carbon nanotubes (CNTs), ion conductive agent is sulfonated graphene lithium salt, binder is polyvinylidene fluoride (PVDF). Wherein, the ion-conducting agent sulfonated graphene lithium salt content in the positive electrode active material coating is 0.3%, and the mass ratio of each substance in the coating is: NCM: SP: KS-6: CNTs: ion-conducting agent (sulfonated graphene Lithium salt): PVDF=93:2.8:1.1:0.5:0.1:2.5. First add PVDF to the solvent NMP, s...

Embodiment 2

[0171] a. Preparation of cathode current collector

[0172] A porous aluminum / carbon composite foil with a thickness of 22μ is used as the current collector, which is purchased from the porous aluminum / carbon composite foil of Yudong Foil Technology Nantong Co., Ltd., model 20CP01.

[0173] b. Preparation of positive electrode active material coating

[0174] With N-dimethylpyrrolidone (NMP) as the solvent, the positive electrode active material is nickel-cobalt manganese oxide lithium (NCM) with an average particle size of 4.5 μm (gram capacity 170mAh / g), and the electronic conductive agent is conductive carbon black (SP), Conductive graphite (KS-6), carbon nanotubes (CNTs), ion conductive agent is sulfonated graphene lithium salt, binder is polyvinylidene fluoride (PVDF). Wherein, the ion-conducting agent sulfonated graphene lithium salt content in the positive electrode active material coating is 0.3%, and the mass ratio of each substance in the coating is: NCM: SP: KS-6: CN...

Embodiment 3

[0198] a. Preparation of cathode current collector

[0199] A porous aluminum / carbon composite foil with a porosity of 40% and a thickness of 22 μ was used as the current collector. The current collector was purchased from the porous aluminum / carbon composite foil of Yudong Foil Technology Nantong Co., Ltd., model 20CP02.

[0200] b. Preparation of positive electrode active material coating

[0201] The positive electrode active material coating is the same as the positive electrode active material coating prepared in b. the positive electrode active material coating in Example 1 of the battery.

[0202] c. Preparation of ion-conducting coating on the surface of the positive pole piece

[0203] The preparation of the ion-conductive coating on the surface of the positive pole piece is the same as that in c. the preparation of the ion-conductive coating on the surface of the positive pole piece in Example 1 of the battery.

[0204] d. Preparation of negative electrode collecto...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention relates to a positive electrode plate for a high-rate rapid-charge lithium ion battery, a negative electrode plate and the high-rate rapid-charge lithium ion battery. The positive (negative) electrode plate is characterized by comprising a positive (negative) current collector, a positive (negative) active substance coating layer and an ion conduction coating layer, wherein the positive (negative) current collector is provided with two opposite surfaces, the positive (negative) active substance coating layer is coated on at least one surface of the positive (negative) current collector, and the ion conduction coating layer is coated on the positive (negative) active substance coating layer. The high-rate rapid-charge lithium ion battery comprising the positive electrode plateand the negative electrode plate is low in internal resistance, small in charge-discharge temperature rising, high in initial charge-discharge efficiency and good in cycle property and safety.

Description

technical field [0001] The invention relates to a lithium-ion battery, in particular to a positive pole piece, a negative pole piece and a corresponding lithium-ion battery of a high-rate fast-charge lithium-ion battery. Background technique [0002] At present, high-rate lithium-ion batteries have been extensively researched and applied, and their characteristic is that they can be discharged with a large current or can be charged quickly, so they are widely used in power batteries and other fields. [0003] In a lithium-ion battery, the active material coating on the electrode sheet is in direct contact with the electrolyte. During the first charge and discharge of the battery, a layer with a thickness of about 100-120nm passivation layer, that is, solid electrolyte interface film (solid electrolyte interface), referred to as SEI film. This layer of SEI film can avoid the direct contact between the electrolyte and the negative electrode, reduce the decomposition of the el...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/13H01M4/62H01M10/0525
CPCH01M4/13H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 吴湘伟李荐卢滔龙德宇
Owner 长沙市秒冲电池技术与材料研究所
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap