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Storage method of power lithium ion battery

A lithium-ion battery and power technology, which is applied to secondary batteries, battery electrodes, secondary battery charging/discharging, etc., can solve the problems of difficult storage time, large decline rate of capacity retention rate, etc., and achieve improved storage stability and improved The effect of stability

Inactive Publication Date: 2020-12-22
江苏卫健信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The positive electrode active material of the power lithium-ion battery is mainly a ternary material. In this field, the ternary material mainly uses three elements of nickel, cobalt, and manganese as the main constituent elements, and is doped with other heteroatoms to form a layered lithium metal oxide. objects, in which the material LiNi 0.24 mn 0.56 co 0.18 Mg 0.02 o 2 The active material of the positive electrode as the positive electrode active material has the characteristics of rate performance, good cycle performance, and good high temperature stability, and the electrolyte includes 3-4 volume % of 1,3-propane sultone and 1.5-2 volume % of 1 -Methyl-2-pyrrolidone can further improve the high-temperature cycle performance of the battery, but after the battery is stored at high temperature, the capacity retention rate decreases greatly, and it is difficult to store for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]The additives of the electrolyte of the lithium ion battery are 3% by volume of 1,3-propane sultone and 1.5% by volume of 1-methyl-2-pyrrolidone, and the storage method includes:

[0025]1) Between charge cut-off voltage 4.25V and discharge cut-off voltage 2.75V, charge and discharge at 0.1C current for 2 cycles;

[0026]2) 4 cycles of charging and discharging at a current of 0.1C between the first predetermined voltage and the second predetermined voltage, the first predetermined voltage = 3.13V; the second predetermined voltage = 3.96V;

[0027]3) Adjust the battery voltage to a third predetermined voltage, the third predetermined voltage=3.59V;

[0028]4) The battery is then stored for a long time at a high temperature of 50 degrees Celsius for 90 days.

Embodiment 2

[0030]The additives of the electrolyte of the lithium ion battery are 4% by volume of 1,3-propane sultone and 2% by volume of 1-methyl-2-pyrrolidone, and the storage method includes:

[0031]1) Perform two charge and discharge cycles between the charge cut-off voltage 4.25V and the discharge cut-off voltage 2.75V;

[0032]2) Cycle 4 times between the first predetermined voltage and the second predetermined voltage, the first predetermined voltage = 3.26V; the second predetermined voltage = 3.86V;

[0033]3) Adjust the battery voltage to a third predetermined voltage, the third predetermined voltage=3.62V;

[0034]4) The battery is then stored for a long time at a high temperature of 50 degrees Celsius for 90 days.

Embodiment 3

[0036]The additives of the electrolyte of the lithium ion battery are 3.5% by volume of 1,3-propane sultone and 1.75% by volume of 1-methyl-2-pyrrolidone, and the storage method includes:

[0037]1) Perform two charge and discharge cycles between the charge cut-off voltage 4.25V and the discharge cut-off voltage 2.75V;

[0038]2) Cycle 4 times between the first predetermined voltage and the second predetermined voltage, the first predetermined voltage = 3.19V; the second predetermined voltage = 3.91V;

[0039]3) Adjust the battery voltage to a third predetermined voltage, the third predetermined voltage=3.61V;

[0040]4) The battery is then stored for a long time at a high temperature of 50 degrees Celsius for 90 days.

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Abstract

The invention provides a storage method of a power lithium ion battery. An electrolyte in the power lithium ion battery comprises 3-4vol% of 1, 3-propane sultone and 1.5-2 vol% of N-methylpyrrolidin-2-one, the volume ratio of 1, 3-propane sultone to N-methylpyrrolidin-2-one is 1: 2, and the storage method comprises the following steps: and performing charge-discharge circulation between the chargecut-off voltage and the discharge cut-off voltage for a plurality of times, then performing circulation between the first predetermined voltage and the second predetermined voltage for a plurality oftimes, then adjusting the battery to a third predetermined voltage, and then storing the battery for a long time at a high temperature. The storage method provided by the invention can greatly improve the cyclic capacity retention rate of the battery after storage, especially the cyclic capacity retention rate under high-temperature storage.

Description

Technical field[0001]The invention relates to a storage method of a power lithium ion battery.Background technique[0002]The positive electrode active material of power lithium-ion battery is mainly ternary material. In the field, the ternary material is mainly composed of three elements of nickel, cobalt and manganese as the main constituent elements, and layered lithium metal oxide composed of other heteroatoms. Objects, of which the material LiNi0.24Mn0.56Co0.18Mg0.02O2The active material of the positive electrode as the positive electrode active material has the characteristics of rate performance, good cycleability, and high temperature stability, and the electrolyte contains 3-4 vol% 1,3-propane sultone and 1.5-2 vol% 1 -Methyl-2-pyrrolidone can further improve the high-temperature cycle performance of the battery, but after the battery is stored at a high temperature, the capacity retention rate decreases greatly, and it is difficult to store for a long time.Summary of the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0567H01M10/0525H01M4/505H01M4/525H01M4/485
CPCH01M4/485H01M4/505H01M4/525H01M10/0525H01M10/0567H01M10/44H01M2300/0025Y02E60/10
Inventor 黄颖
Owner 江苏卫健信息科技有限公司
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