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

a secondary battery

A secondary battery and electrolyte technology, applied to secondary batteries, battery electrodes, circuits, etc., can solve problems such as diving, cycle attenuation, and negative electrode kinetics reduction

Active Publication Date: 2021-09-17
CONTEMPORARY AMPEREX TECH CO
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the intercalation and extraction of lithium ions in the negative electrode continue, the extrusion force of the positive electrode and the negative electrode increases simultaneously, causing the electrolyte to be squeezed out from between the positive and negative electrodes, and the kinetics of the negative electrode is reduced, thereby reducing the lithium separation window of the cell. And then lead to sharp attenuation of circulation, diving

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
  • a secondary battery
  • a secondary battery
  • a secondary battery

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0046] When the secondary battery is a lithium-ion battery, a conventional lithium-ion battery preparation method can be used, which at least includes the following steps:

[0047] Step 1. Coating the positive electrode slurry including the positive electrode active material, conductive agent and binder on the surface of the positive electrode current collector, forming a positive electrode active material layer after drying, and obtaining the positive electrode sheet;

[0048] Step 2, coating the negative electrode slurry including the negative electrode active material and the binder on the surface of the negative electrode current collector, forming a negative electrode active material layer after drying, and obtaining the negative electrode sheet;

[0049] Step 3: Stack the positive pole piece, the separator and the negative pole piece sequentially, and then wind or press them to obtain a bare cell, then inject electrolyte, and package to obtain a secondary battery.

[005...

Embodiment

[0076] Preparation of negative electrode sheet

[0077] Mix carbon material A and carbon material B with conductive agent carbon black Super P and binder styrene-butadiene rubber (SBR) according to the weight ratio of 92:3:5 according to different proportions, add solvent N-methylpyrrolidone, stir and mix Negative electrode slurry is obtained after uniformity. Evenly coat the negative electrode slurry on the coating layer of the negative electrode current collector, dry it at 80-90°C after coating, perform cold pressing, slitting, and cutting into pieces, and then dry it under vacuum at 110°C for 4 hours. Negative electrode sheets 1 to 12 were obtained. The preparation method of the negative pole pieces D1-D5 is similar to that of the negative pole pieces 1-12, except that the carbon material has changed. Wherein, carbon material A includes carbon materials A1-A4, and carbon material B includes carbon materials B1-B4. The physical and chemical parameters of the above-menti...

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
densityaaaaaaaaaa
densityaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The present application relates to a secondary battery, which includes a positive pole piece, a negative pole piece, a separator and an electrolyte, the positive pole piece includes a positive active material layer, and the positive active material layer contains a ternary positive material. The negative electrode sheet includes a negative electrode active material layer, where the active material includes carbon material A and carbon material B. The above-mentioned carbon material B has a relatively high reversible capacity, and cooperates with the ternary positive electrode material to achieve a high gram capacity of the battery. Compared with carbon material B, carbon material A has a lower degree of graphitization, relatively larger interlayer spacing, and higher mechanical strength. The mixed use of two carbon materials can ensure that the negative electrode sheet has both high reversible capacity and good pressure resistance, and improves the cycle life of the battery.

Description

technical field [0001] The present application relates to the field of secondary batteries, in particular, to a secondary battery and negative electrode active materials in the secondary battery. Background technique [0002] With the popularity of electric vehicles around the world, electric vehicles have higher and higher requirements for cruising range, and correspondingly, it is required to increase the energy density of power batteries. Facing these demands, the layered ternary cathode material NCM(Li(Ni x mn y co z )O 2 , where x+y+z=1) came into being. Compared with the LCO cathode material, Mn and Ni elements are introduced into the NCM material. The Mn element is not chemically active, but it can improve the safety and stability of the material, and at the same time reduce the cost of the material. Ni element can improve the material activity and increase the gram capacity of the material. However, during the charging and discharging process of the ternary mat...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525
CPCH01M10/0525H01M2004/021H01M4/587H01M4/133H01M4/1393H01M2004/027Y02E60/10
Inventor 曹俊琪张小细闫传苗余洋黄海宁
Owner CONTEMPORARY AMPEREX TECH CO
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