Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Fast-charging lithium ion battery and preparation method thereof

A lithium-ion battery and conductive agent technology, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of affecting the rate performance and cycle performance of materials, inability to apply electric vehicles, irreversible structural changes, etc. Liquid and liquid retention properties, detachment inhibition, and retention effects

Active Publication Date: 2021-06-22
WANHUA CHEM GRP CO LTD
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electric vehicles not only require a high mileage, but must also meet the characteristics of fast charging and fast discharging. Lithium-ion batteries in the conventional 3C field cannot be used in the field of electric vehicles.
In recent years, as people's requirements for cruising range have increased, the energy density requirements for lithium-ion batteries have become higher and higher. The positive electrode materials of the ternary (NCM, NCA) system have been gradually applied due to their high gram capacity and high compaction density. In the field of passenger vehicles, high-capacity ternary materials contain high nickel content, and the stability of the material will be worse than other materials. During the fast charging process, the irreversible structural change of the material will occur due to polarization. Affect the rate performance and cycle performance of materials

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
  • Fast-charging lithium ion battery and preparation method thereof
  • Fast-charging lithium ion battery and preparation method thereof
  • Fast-charging lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Example 1 (S1)

[0076] (1) Add 200g PVDF5130 (polyvinylidene fluoride, positive electrode binder) to 3800g nitrogen methyl pyrrolidone (referred to as NMP, positive electrode solvent) and stir for 2h to disperse it (the solid content of PVDF5130 is 5wt%); then add 270g conductive carbon black (a part of the positive electrode conductive agent), continue to stir for 2h; then add 30g of three-dimensional macroporous carbon (another part of the positive electrode conductive agent) to it, continue to stir for 2h; then add 9500g of lithiated intercalation compound LiNi to it 0.5 co 0.2 mn 0.3 al 0.003 o 2 (Positive electrode active material), stirring for 5 hours to obtain positive electrode slurry; wherein, the particles of the positive electrode active material are secondary spherical particles, and the particle diameter D50 of the particles is 7.5 μm;

[0077] (2) Coating three-dimensional macroporous carbon on a non-porous aluminum foil (type 1235-H18) with a thickn...

Embodiment 2-5

[0081] Embodiment 2-5 (S2-5) and comparative example 1-2 (D1-2)

[0082] A fast-charge lithium-ion battery was prepared according to the method in Example 1. in,

[0083] 1. In embodiment 2, compared with embodiment 1, there are only the following differences:

[0084] The total amount of positive electrode conductive agent remains unchanged, but it is pure conductive carbon black, without adding three-dimensional macroporous carbon;

[0085] The negative current collector is only microporous copper foil, not coated with three-dimensional macroporous carbon;

[0086] The total amount of the negative electrode conductive agent remains unchanged, but it is pure conductive carbon black without adding three-dimensional macroporous carbon.

[0087] 2. In Example 3, compared with Example 1, there are only the following differences:

[0088] The negative current collector is only microporous copper foil, not coated with three-dimensional macroporous carbon;

[0089] The total am...

Embodiment 6-9

[0101] Embodiment 6-9 (S6-9)

[0102] A fast-charge lithium-ion battery was prepared according to the method in Example 1. Wherein, the selection and consumption of each raw material in the embodiment 6-9 are shown in Table 1.

[0103] During the preparation process: the viscosity of the obtained positive / negative electrode slurry, its coating surface density on the positive / negative electrode sheet and the compaction density of the positive / negative electrode sheet are shown in Table 2; among them, Example 2- 5 and in comparative example 1-2, the viscosity of gained positive electrode slurry is respectively 8500cps, 8250cps, 8350cps, 8300cps, 8150cps and 8200cps, the viscosity of gained negative electrode slurry is respectively 3450cps, 3550cps, 3750cps, 3650cps, 3400cps, 3800cps, not Listed in Table 2 again; in embodiment 2-5 and comparative example 1-2, the coating surface density of the obtained positive / negative electrode slurry on the positive / negative electrode sheet a...

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
Hole diameteraaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a fast-charging lithium ion battery and a preparation method thereof. The fast-charging lithium ion battery comprises a positive pole piece, a negative pole piece, an electrolyte, a diaphragm and an outer packaging structure, wherein the positive pole piece comprises a positive active material, a positive current collector, a positive conductive agent and a positive binder; the negative pole piece comprises a negative active material, a negative current collector, a negative conductive agent, a negative binder and an anti-settling agent; the positive electrode active material is lithiated embedded compound LiaNi<1-x-y>CoxMnyMzRqO2, M is any one of Al, Mg, Sr, Zr, Ti and Cr, R is B or V, 0<=x<=0.3, 0.05<=y<=0.5, 0<=z<=0.01, 0<=q<=0.01, and 0.95<=a<=1.1; the positive current collector is an aluminum foil of which the surface is coated with three-dimensional macroporous carbon; the anode and cathode conductive agent comprises conductive carbon black; and the negative current collector is a microporous copper foil. The fast-charging lithium ion battery has relatively high rate capability and cycle performance, and is stable in performance. The preparation method is simple.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a fast-charging lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have the characteristics of high energy density, high cycle life and low self-discharge, and have been gradually used in the field of electric vehicles in recent years. Electric vehicles not only require high cruising range, but also must meet the characteristics of fast charging and fast discharging. Lithium-ion batteries in the conventional 3C field cannot be used in the field of electric vehicles. In recent years, as people's requirements for cruising range have increased, the energy density requirements for lithium-ion batteries have become higher and higher. The positive electrode materials of the ternary (NCM, NCA) system have been gradually applied due to their high gram capacity and high compaction density. In the fie...

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): H01M10/058H01M10/0525H01M4/66H01M4/62H01M4/583
CPCH01M10/058H01M10/0525H01M4/667H01M4/661H01M4/625H01M4/583Y02P70/50Y02E60/10
Inventor 王洪湖
Owner WANHUA CHEM GRP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com