Unlock instant, AI-driven research and patent intelligence for your innovation.

Battery pole piece, preparation method thereof and secondary battery

A technology of battery pole pieces and secondary batteries, which is applied in the direction of secondary batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of high battery temperature, failure to meet the needs of special fields, and unusable batteries, so as to improve discharge performance, Effect of improving high and low temperature performance

Inactive Publication Date: 2019-09-17
FOSHAN UNIVERSITY
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Secondary batteries (such as lithium-ion batteries, nickel-cadmium batteries, and nickel-metal hydride batteries) have the characteristics of high energy density and have been widely used in various industries, but various fields have higher and higher requirements for battery performance. In some military and extreme cold fields, It is required that the battery can be used at minus 50 degrees, but the existing batteries are basically unusable at minus 40 degrees, which cannot meet the needs of special fields
[0003] At the same time, at high temperature, the battery will also generate heat during charging and discharging, which will cause the temperature of the battery itself to be too high, posing a safety hazard

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
  • Battery pole piece, preparation method thereof and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 0.1% (relative to the weight of positive and negative active materials) paraffin to the formula of positive pole and negative pole of lithium-ion battery respectively, obtain positive pole piece and negative pole piece, make battery then, wherein separator is cergard 23 model, electrolysis Liquid is 1mol / L lithium hexafluorophosphate organic solution;

[0028] The lithium-ion battery positive electrode formula is: positive electrode active material (lithium cobaltate): conductive agent (conductive graphite): binder (PVDF): solvent (NMP)=100:2.5:5:50 (weight ratio);

[0029] Lithium-ion battery negative electrode formula is: active material (graphite): conductive agent (conductive graphite): binder (CMC): solvent (water)=100:1:1.5:50 (weight ratio);

Embodiment 2

[0031] Add 1% (relative to the weight of the positive and negative active material) paraffin to the formula of the positive pole and the negative pole of the lithium-ion battery respectively to obtain the positive pole piece and the negative pole piece, and then make the battery, wherein the separator is a cergard 23 model, electrolyzed Liquid is 1mol / L lithium hexafluorophosphate organic solution;

Embodiment 3

[0033] Add 3% (relative to the weight of positive and negative active materials) paraffin wax respectively in the formula of positive pole and negative pole of lithium-ion battery, obtain positive pole piece and negative pole piece, make battery then, wherein separator is cergard 23 model, electrolysis Liquid is 1mol / L lithium hexafluorophosphate organic solution;

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

No PUM Login to View More

Abstract

The invention belongs to the technical field of secondary batteries, and discloses a battery pole piece, a preparation method thereof and a secondary battery. The battery pole piece comprises a current collector, an active material, a binder, a conductive agent and a phase change material for improving the high-temperature and low-temperature performance of a battery. According to the invention, 0.1-10% (relative to the weight of positive and negative active materials) of a phase change material (such as paraffin) is added into the formula of the positive and negative electrodes of the battery; after the battery is manufactured, when the battery is in a low temperature state, heat is discharged under the condition that the temperature of the phase change material can be kept unchanged at the low temperature, and the temperature in the battery cell cannot be rapidly cooled to the outside environment temperature; during discharging, the heat generated in the battery cell is stored in the battery cell, so that the discharging performance of the battery at the low temperature is improved; when the environment temperature rises, the phase change material can absorb heat and keep the temperature constant, so that the battery discharges at high temperature, and safety accidents caused by too big temperature rise are avoided; and the high-low temperature performance of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a battery pole piece, a preparation method thereof and a secondary battery. Background technique [0002] Secondary batteries (such as lithium-ion batteries, nickel-cadmium batteries, and nickel-metal hydride batteries) have the characteristics of high energy density and have been widely used in various industries, but various fields have higher and higher requirements for battery performance. In some military and extreme cold fields, It is required that the battery can be used at minus 50 degrees, but the existing batteries are basically unusable at minus 40 degrees, which cannot meet the needs of special fields. [0003] At the same time, at high temperature, heat will be generated during the charging and discharging process of the battery, which will cause the temperature of the battery itself to be too high, posing a safety hazard. Contents of the in...

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 Applications(China)
IPC IPC(8): H01M4/13H01M4/131H01M4/133H01M4/136H01M4/32H01M4/24H01M4/04H01M4/139H01M4/1391H01M4/1393H01M4/1397H01M4/28H01M4/30H01M4/62H01M10/654H01M10/659H01M10/0525H01M10/30
CPCH01M4/0404H01M4/0435H01M4/13H01M4/131H01M4/133H01M4/136H01M4/139H01M4/1391H01M4/1393H01M4/1397H01M4/242H01M4/246H01M4/28H01M4/30H01M4/32H01M4/62H01M10/0525H01M10/30H01M10/654H01M10/659Y02E60/10
Inventor 陈海初
Owner FOSHAN UNIVERSITY