Activation method of lithium manganate battery

A technology for lithium manganese oxide and battery positive electrode, which is applied in the field of activation of lithium manganate battery, can solve problems such as poor cycle performance, increased internal resistance of the battery, and decreased capacity, and achieve good high temperature performance, stable positive electrode surface, and good cycle performance. retentive effect

Inactive Publication Date: 2020-09-29
陆信甫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium manganate has the characteristics of good safety, wide source of raw materials, and good rate performance. It is a commonly used active material for power lithium-ion batteries. However, the cycle performance of lithium manganate batteries is poor. At present, the more common method is to Add a combination of additives, the electrolyte contains vinylene carbonate and 1,4-butane sultone, wherein the volume ratio of vinylene carbonate and 1,4-butane sultone is 1:2, the invention People foun

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Adjust the battery voltage to the storage voltage, the storage voltage is 3.65V, store for 100 days, and measure the open circuit voltage of the lithium manganate battery;

[0027] 2) comparing the open circuit voltage with the first predetermined voltage, if the open circuit voltage is lower than the first predetermined voltage, then enter step 3; otherwise, enter step 4, the first predetermined voltage is 3.50V;

[0028] 3) Charge at a constant current of 0.02C to the second predetermined voltage, charge at a constant voltage at the second predetermined voltage until the charging current is as low as 0.01C, and the second predetermined voltage is 4.25V; discharge at a constant current of 0.1C to the second predetermined voltage a predetermined voltage;

[0029] 4) Charging with a constant current of 0.02C to the charging cut-off voltage; the charging cut-off voltage is 4.20V, and charging with a constant voltage of the charging cut-off voltage until the charging cu...

Embodiment 2

[0035] 1) Adjust the battery voltage to the storage voltage, the storage voltage is 3.70V, store for 100 days, and measure the open circuit voltage of the lithium manganate battery;

[0036] 2) comparing the open circuit voltage with the first predetermined voltage, if the open circuit voltage is lower than the first predetermined voltage, then enter step 3; otherwise, enter step 4, the first predetermined voltage is 3.55V;

[0037] 3) Charge at a constant current of 0.02C to the second predetermined voltage, charge at a constant voltage at the second predetermined voltage until the charging current is as low as 0.01C, and the second predetermined voltage is 4.30V; discharge at a constant current of 0.1C to the second predetermined voltage a predetermined voltage;

[0038] 4) Charge at a constant current of 0.02C to the charging cut-off voltage; the charging cut-off voltage is 4.25V, and charge at a constant voltage at the charging cut-off voltage until the charging current is...

Embodiment 3

[0044] 1) Adjust the battery voltage to the storage voltage, the storage voltage is 3.65V, store for 100 days, and measure the open circuit voltage of the lithium manganate battery;

[0045] 2) comparing the open circuit voltage with the first predetermined voltage, if the open circuit voltage is lower than the first predetermined voltage, then enter step 3; otherwise, enter step 4, the first predetermined voltage is 3.55V;

[0046] 3) Charge at a constant current of 0.02C to the second predetermined voltage, charge at a constant voltage at the second predetermined voltage until the charging current is as low as 0.01C, and the second predetermined voltage is 4.25V; discharge at a constant current of 0.1C to the second predetermined voltage a predetermined voltage;

[0047] 4) Charging with a constant current of 0.02C to the charging cut-off voltage; the charging cut-off voltage is 4.20V, and charging with a constant voltage of the charging cut-off voltage until the charging cu...

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PUM

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Abstract

The invention provides an activation method of a lithium manganate battery. A positive electrode active material of the lithium manganate battery is lithium manganate, the chemical formula of the lithium manganate is LiMn(1-x)NixO2, and x is equal to 0-0.1; the electrolyte of the lithium manganate battery contains vinylene carbonate and 1,4-butane sultone, and the volume ratio of vinylene carbonate to 1,4-butane sultone is 1: 2; the activation method comprises the following steps of measuring the open-circuit voltage of the lithium manganate battery when the storage voltage is stored for a preset time, comparing the open-circuit voltage is compared with the first preset voltage, carrying out different activation steps according to the comparison result, carrying out battery evaluation on the specific battery before activation according to the activation method, and then determining the proper activation step. The battery obtained through the activation step can recover the high capacity and has the high cycle performance.

Description

technical field [0001] The invention relates to an activation method for a lithium manganate battery. Background technique [0002] Lithium manganate has the characteristics of good safety, wide source of raw materials, and good rate performance. It is a commonly used active material for power lithium-ion batteries. However, the cycle performance of lithium manganate batteries is poor. At present, the more common method is to Add a combination of additives, the electrolyte contains vinylene carbonate and 1,4-butane sultone, wherein the volume ratio of vinylene carbonate and 1,4-butane sultone is 1:2, the invention People found that when the positive electrode material is nickel-doped lithium manganese oxide, the battery containing vinylene carbonate and 1,4-butane sultone in the electrolyte can obtain better high-temperature performance and cycle retention, but However, after long-term storage, vinylene carbonate and 1,4-butane sultone in the electrolyte will undergo side r...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/505H01M4/525H01M10/0567H01M10/44H01M10/42
CPCH01M4/505H01M4/525H01M10/0525H01M10/0567H01M10/42H01M10/4235H01M10/44Y02E60/10
Inventor 陆信甫
Owner 陆信甫
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