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Preparation method of lithium manganate battery

A lithium manganate battery, the lithium manganate technology, is applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., and can solve the problems of battery capacity and cycle life attenuation, cycle performance reduction, lattice collapse, etc., to prevent The effect of reducing battery capacity, improving storage performance, and increasing capacity

Inactive Publication Date: 2020-08-14
盛蕾
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spinel lithium manganese oxide, as a commonly used positive electrode material for lithium-ion batteries, has many advantages, but it is prone to volume changes during the cycle, resulting in lattice collapse and reduced cycle performance. Therefore, doping is generally used in this field. The way to improve, for example, the chemical formula is LiMn 1.7 co 0.25 Al 0.05 o 4 The material has good cycle performance, but the battery made of this material will experience serious capacity and cycle life attenuation during storage. How to further improve the effective capacity and cycle performance of this material has become the focus of further research.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) placing the positive electrode and the counter electrode lithium sheet in the first electrolytic solution; the first electrolytic solution contains diethyl sulfite with a content of 1.2% by volume as an additive;

[0029] 2) Carry out 0.01C constant current charge and discharge cycle 5 times between 2.68V and 2.72V;

[0030] 3) Adjust the voltage to 2.68V;

[0031] 4) Take out the positive electrode, assemble it and the negative electrode into a battery, put it into the casing, and inject the second electrolyte; the second electrolyte contains vinylene carbonate with a content of 1.5% by volume as an additive;

[0032] 5) 0.05C constant current charging to 3.86V;

[0033] 6) Charge with a constant voltage of 3.86V until the charging current is lower than 0.01C;

[0034] 7) 0.05C constant current charging to 4.20V;

[0035] 8) Charge with a constant voltage of 4.20V until the charging current is lower than 0.01C;

[0036] 9) 0.05C constant current cycle between 4....

Embodiment 2

[0038] 1) placing the positive electrode and the counter electrode lithium sheet in the first electrolytic solution; the first electrolytic solution contains diethyl sulfite with a content of 1.8% by volume as an additive;

[0039] 2) Perform 0.03C constant current charge and discharge cycle 5 times between 2.72V and 2.74V;

[0040] 3) Adjust the voltage to 2.72V;

[0041] 4) Take out the positive electrode, assemble it and the negative electrode into a battery, put it into the casing, and inject the second electrolyte; the second electrolyte contains vinylene carbonate with a content of 2.5% by volume as an additive;

[0042] 5) 0.2C constant current charging to 3.88V;

[0043] 6) Charge with a constant voltage of 3.88V until the charging current is lower than 0.01C;

[0044] 7) 0.2C constant current charging to 4.25V;

[0045] 8) Charge with a constant voltage of 4.25V until the charging current is lower than 0.01C;

[0046] 9) 0.2C constant current cycle between 4.25V a...

Embodiment 3

[0048] 1) placing the positive electrode and the counter electrode lithium sheet in the first electrolytic solution; the first electrolytic solution contains diethyl sulfite with a content of 1.5% by volume as an additive;

[0049] 2) Carry out 0.02C constant current charge and discharge cycle 5 times between 2.7V and 2.73V;

[0050] 3) Adjust the voltage to 2.7V;

[0051] 4) Take out the positive electrode, assemble it and the negative electrode into a battery, put it into the casing, and inject the second electrolyte; the second electrolyte contains vinylene carbonate with a content of 2% by volume as an additive;

[0052] 5) 0.1C constant current charging to 3.87V;

[0053] 6) Charge with a constant voltage of 3.87V until the charging current is lower than 0.01C;

[0054] 7) 0.1C constant current charging to 4.25V;

[0055] 8) Charge with a constant voltage of 4.25V until the charging current is lower than 0.01C;

[0056] 9) 0.1C constant current cycle between 4.25V and...

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PUM

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Abstract

The invention provides a preparation method of a lithium manganate battery. A positive electrode active material of the lithium manganate battery is spinel lithium manganate, and the chemical formulaof the spinel lithium manganate is LiMn1.Co0.25Al0.05O4; a negative electrode active substance is a graphite material; the preparation method comprises the following steps: putting a positive electrode and a lithium sheet into a first electrolyte, carrying out constant-current charging and discharging circulation for a plurality of times between a first preset voltage and a second preset voltage,and adjusting the voltage to be the first preset voltage; taking out the positive electrode, assembling the positive electrode and the negative electrode into a battery, putting the battery into a shell, injecting a second electrolyte, carrying out constant-current charging to a third predetermined voltage, and carrying out constant-voltage charging at the third predetermined voltage; and carryingout constant-current charging to a charging cut-off voltage, carrying out constant-voltage charging at the charging cut-off voltage, and circulating between the charging cut-off voltage and a discharging cut-off voltage for a plurality of times to obtain the lithium manganate battery. The lithium manganate battery obtained by the method disclosed by the invention has relatively high storage performance, and the battery can be stored for a relatively long time from delivery to use, so that effective capacity attenuation does not occur.

Description

technical field [0001] The invention relates to a preparation method of a lithium manganate battery. Background technique [0002] Lithium-ion batteries have been used in many civilian and military fields such as mobile phones, notebook computers, video cameras, and digital cameras. Spinel lithium manganese oxide, as a commonly used positive electrode material for lithium-ion batteries, has many advantages, but it is prone to volume changes during the cycle, resulting in lattice collapse and reduced cycle performance. Therefore, doping is generally used in this field. The way to improve, for example, the chemical formula is LiMn 1.7 co 0.25 al 0.05 o 4 The material has good cycle performance, but the battery made of this material will experience serious capacity and cycle life attenuation during storage. How to further improve the effective capacity and cycle performance of this material has become the focus of further research. . Contents of the invention [0003] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/44H01M10/42H01M10/0525H01M4/505H01M4/583
CPCH01M4/505H01M4/583H01M10/0525H01M10/058H01M10/4235H01M10/446Y02E60/10Y02P70/50
Inventor 盛蕾
Owner 盛蕾
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