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

A kind of formation method of lithium manganese oxide battery

A technology of lithium manganate battery and chemical formation method, which is applied to lithium batteries, battery electrodes, secondary batteries, etc., can solve the problems of positive cycle life attenuation and other problems, and achieves improvement of cycle performance, high temperature cycle performance, and cycle life attenuation phenomenon. Effect

Active Publication Date: 2021-11-02
江西海量动力新能源有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The positive electrode active materials of lithium manganate batteries are mainly layered lithium manganate and spinel lithium manganate. Among them, spinel lithium manganate is one of the research focuses as a material with stable structure, cycle performance and high safety performance. where LiMn 1.84 co 0.14 Mg 0.01 Al 0.01 o 4 , the average particle diameter D50 is 2.2 microns, has good electrochemical performance, and in order to further improve its rate performance and cycle performance as the positive electrode, the polyaniline additive that accounts for 0.35% by mass of lithium manganate is added to the positive electrode active material layer It can improve the rate performance and cycle performance, but the cycle life of the positive electrode after adding polyaniline is more obvious at high temperature

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) The assembled battery is injected into the electrolyte, which includes dibenzofuran and difluoroethylene carbonate as additives, the volume percentage of the dibenzofuran is 0.8%, and the difluoroethylene The volume percentage composition of ethylene carbonate is 2.8%;

[0030] 2) 0.05C constant current charging to the first predetermined voltage; the first predetermined voltage

[0031] =3.62-4.2*0.008=3.59V

[0032] 3) Constant voltage charging with the first predetermined voltage until the charging current is as low as the cut-off current of 0.01C;

[0033] 4) 0.05C constant current charging to the second predetermined voltage; the second predetermined voltage

[0034] =3.62-4.2*0.008+2.6*0.028=3.66V

[0035] 5) Constant voltage charging with the second predetermined voltage until the charging current is as low as the cut-off current of 0.01C;

[0036] 6) 0.05C constant current charging to the third predetermined voltage; the third predetermined voltage

[00...

Embodiment 2

[0042] 1) The assembled battery is injected into the electrolyte, which includes dibenzofuran and difluoroethylene carbonate as additives, the volume percentage of the dibenzofuran is 1.0%, and the difluoroethylene The volume percentage composition of ethylene carbonate is 3.5%;

[0043] 2) 0.05C constant current charging to the first predetermined voltage; the first predetermined voltage

[0044] =3.62-4.2*0.01=3.58V

[0045] 3) Constant voltage charging with the first predetermined voltage until the charging current is as low as the cut-off current of 0.01C;

[0046] 4) 0.05C constant current charging to the second predetermined voltage; the second predetermined voltage

[0047] =3.62-4.2*0.01+2.6*0.035=3.67V

[0048] 5) Constant voltage charging with the second predetermined voltage until the charging current is as low as the cut-off current of 0.01C;

[0049] 6) 0.05C constant current charging to the third predetermined voltage; the third predetermined voltage

[0050...

Embodiment 3

[0055]1) The assembled battery is injected into the electrolyte, which includes dibenzofuran and difluoroethylene carbonate as additives, the volume percentage of the dibenzofuran is 0.9%, and the difluoroethylene The volume percentage composition of ethylene carbonate is 3.15%;

[0056] 2) 0.05C constant current charging to the first predetermined voltage; the first predetermined voltage

[0057] =3.62-4.2*0.009=3.58V;

[0058] 3) Constant voltage charging with the first predetermined voltage until the charging current is as low as the cut-off current of 0.01C;

[0059] 4) 0.05C constant current charging to the second predetermined voltage; the second predetermined voltage

[0060] =3.62-4.2*0.009+2.6*0.0315=3.66V;

[0061] 5) Constant voltage charging with the second predetermined voltage until the charging current is as low as the cut-off current of 0.01C;

[0062] 6) 0.05C constant current charging to the third predetermined voltage; the third predetermined voltage

...

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
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for forming a lithium manganate battery, the positive electrode active material of the lithium manganate battery is spinel lithium manganate, LiMn 1.84 co 0.14 Mg 0.01 Al 0.01 o 4 , the average particle diameter D50 is 2.2 microns, and the positive electrode active material layer contains polyaniline accounting for 0.35% by mass of lithium manganate; constant current charging to the first predetermined voltage, constant voltage charging at the first predetermined voltage; constant current charging To the second predetermined voltage, charge with constant voltage at the second predetermined voltage; charge with constant current to the third predetermined voltage, charge with constant voltage at the third predetermined voltage; then charge and discharge with constant current between the first predetermined voltage and the third predetermined voltage Cycle several times, and then charge and discharge several times at a constant current between the charge cut-off voltage and discharge cut-off voltage, the cycle performance of the lithium manganate battery obtained in the present invention is greatly improved in a high-temperature environment.

Description

technical field [0001] The invention relates to a method for forming a lithium manganate battery. Background technique [0002] The positive electrode active materials of lithium manganate batteries are mainly layered lithium manganate and spinel lithium manganate. Among them, spinel lithium manganate is one of the research focuses as a material with stable structure, cycle performance and high safety performance. where LiMn 1.84 co 0.14 Mg 0.01 Al 0.01 o 4 , the average particle diameter D50 is 2.2 microns, has good electrochemical performance, and in order to further improve its rate performance and cycle performance as the positive electrode, the polyaniline additive that accounts for 0.35% by mass of lithium manganate is added to the positive electrode active material layer The rate performance and cycle performance can be improved in the middle, but the cycle life decay of the positive electrode after adding polyaniline is more obvious at high temperature. Conten...

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): H01M10/44H01M4/62H01M10/0567H01M10/052H01M4/505H01M4/525H01M4/485
CPCH01M4/485H01M4/505H01M4/525H01M4/62H01M10/052H01M10/0567H01M10/446Y02E60/10
Inventor 金妍
Owner 江西海量动力新能源有限公司