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High-temperature storage method of lithium manganate battery

A lithium manganate battery and lithium manganate technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte storage batteries, etc., can solve the problems of poor cycle performance of batteries, poor storage performance of lithium manganate batteries, etc., and achieve improved The effect of chemical inertness

Inactive Publication Date: 2020-09-25
钱起
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium manganate, as the lowest cost and most widely used lithium-ion battery cathode material, is widely used in lithium-ion secondary batteries, but the storage performance of lithium manganate batteries is poor because the electrolyte will decompose on the surface of lithium manganate Generate gas, resulting in poor cycle performance of the battery

Method used

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  • High-temperature storage method of lithium manganate battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Heat the assembled lithium manganate battery to 40°C;

[0030] 2) injecting the first electrolytic solution at normal temperature, the solvent of the first electrolytic solution is ethylene carbonate, which contains 5% by mass of bromobutyrolactone;

[0031] 3) Adjust the temperature of the battery to 10°C, charge the battery with a constant current of 1C to a first predetermined voltage, and the first predetermined voltage is 3.64V;

[0032] 4) Adjust the temperature of the battery to 40°C, and charge the battery at a constant voltage at the first predetermined voltage until the current is lower than the cut-off current by 0.01C;

[0033] 5) Inject the second electrolyte solution at normal temperature, the volume ratio of the first electrolyte solution and the second electrolyte solution is 65:35. The solvent of the second electrolyte solution is dimethyl carbonate, which contains 6% by mass of 1, 4-butane sultone;

[0034] 6) Adjust the temperature of the battery...

Embodiment 2

[0039] 1) Heat the assembled lithium manganate battery to 50°C;

[0040] 2) injecting the first electrolytic solution at normal temperature, the solvent of the first electrolytic solution is ethylene carbonate, which contains 8% by mass of bromobutyrolactone;

[0041] 3) Adjust the battery temperature to 10°C, and charge the battery with a constant current of 1C to the first predetermined voltage, and the first predetermined voltage is 3.68V;

[0042] 4) Adjust the temperature of the battery to 50°C, and charge the battery at a constant voltage at the first predetermined voltage until the current is lower than the cut-off current by 0.01C;

[0043] 5) Inject the second electrolyte solution at normal temperature, the volume ratio of the first electrolyte solution and the second electrolyte solution is 75:25. The solvent of the second electrolyte solution is dimethyl carbonate, which contains 10% by mass of 1, 4-butane sultone;

[0044] 6) Adjust the battery temperature to 10°...

Embodiment 3

[0049] 1) Heat the assembled lithium manganate battery to 45°C;

[0050] 2) Inject the first electrolyte solution at normal temperature, the solvent of the first electrolyte solution is ethylene carbonate, which contains 7% by mass of bromobutyrolactone;

[0051] 3) Adjust the battery temperature to 5°C, and charge the battery with a constant current of 1C to the first predetermined voltage, and the first predetermined voltage is 3.66V;

[0052] 4) Adjust the battery temperature to 45°C, and charge the battery at a constant voltage at the first predetermined voltage until the current is lower than the cut-off current by 0.01C;

[0053] 5) inject the second electrolytic solution at normal temperature, the volume ratio of the first electrolytic solution and the second electrolytic solution is 7:3, the solvent of the second electrolytic solution is dimethyl carbonate, which contains 9% by mass of 1, 4-butane sultone;

[0054] 6) Adjust the temperature of the battery to 5°C, cha...

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Abstract

The invention provides a high-temperature storage method of a lithium manganate battery. A positive electrode active material of the lithium manganate battery comprises lithium manganate accounting for more than 50% of the total mass of the active material. The high-temperature storage method comprises: heating the assembled lithium manganate battery to 40 to 50 DEG C; injecting a first electrolyte at normal temperature; adjusting the temperature of the battery to be below 10 DEG C; and carrying out constant-current charging to a first predetermined voltage, adjusting the temperature of the battery to 40-50 DEG C, carrying out constant-voltage charging at the first predetermined voltage, injecting a second electrolyte at normal temperature, carrying out constant-current charging and discharging circulation between a charging cut-off voltage and a discharging cut-off voltage for a plurality of times, and storing the battery in an environment with the temperature of 30 DEG C or above. The battery stored by the storage method disclosed by the invention can be stored for more than 100 days in an environment with the temperature of more than 30 DEG C, and the attenuation of the cycle capacity is controlled within 5%.

Description

technical field [0001] The invention relates to a high-temperature storage method for a lithium manganese oxide battery. Background technique [0002] Lithium manganate, as the lowest cost and most widely used lithium-ion battery cathode material, is widely used in lithium-ion secondary batteries, but the storage performance of lithium manganate batteries is poor because the electrolyte will decompose on the surface of lithium manganate Gas is generated, resulting in poor cycle performance of the battery. How to form a stable passivation layer has become the key point of storing lithium manganese oxide batteries. Contents of the invention [0003] The invention provides a high-temperature storage method for a lithium manganate battery. The positive electrode active material of the lithium manganate battery includes lithium manganate accounting for more than 50% by mass of the total mass of the active material, and the chemical formula of the lithium manganate is LiMn 1-x...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/62H01M10/0525H01M10/44H01M10/058
CPCH01M4/505H01M4/628H01M10/0525H01M10/058H01M10/443H01M2004/028Y02E60/10Y02P70/50
Inventor 钱起
Owner 钱起
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