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Method for forming lithium ion battery with mixed electrode

A technology of lithium ion battery and formation method, applied in the field of formation of lithium ion battery, can solve the problems of decreased battery durability, insufficient SEI film formation, irreversible insertion of lithium ions, etc., to improve stability, shorten formation time, and improve Effects of stability and productivity

Active Publication Date: 2020-02-11
泰州纳新新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the power battery, there are high requirements for the energy density, safety and manufacturing cost of the battery, while the ternary material and lithium iron phosphate battery have good high temperature resistance and safety performance, and are the first choice as the active material of the power battery , and the mixed electrodes of different materials are beneficial to improve the energy density of lithium-ion batteries. However, due to the different working voltages of ternary materials and lithium iron phosphate, there will be two working platforms during the charge and discharge process, iron phosphate The working platform of lithium works at 3.6V, and the starting voltage and ending voltage of the platform are relatively close, and the working platform is relatively gentle, while the ternary material has three different transition metals, so the working platform has a large inclination, generally at It is about 3.8V, and for the mixed material of ternary material and lithium iron phosphate, it is difficult to fully activate the formation of two different materials at the same time by the general formation method, and the formation of SEI film is not sufficient, which will lead to the existence of lithium ions during the cycle There are many cases of irreversible embedding, which leads to a decrease in the durability of the battery

Method used

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  • Method for forming lithium ion battery with mixed electrode
  • Method for forming lithium ion battery with mixed electrode
  • Method for forming lithium ion battery with mixed electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Charge to 2.9V with a constant current of 0.01C;

[0038] 2) Charge to 3.55V with a constant current of 0.02C;

[0039] 3) In the range of 3.55-3.65V, charge and discharge 4 times with a constant current of 0.05C;

[0040] 4) Charge to 3.7V with a constant current of 0.05C;

[0041] 5) In the range of 3.70-3.90V, charge and discharge 4 times with a constant current of 0.02C;

[0042] 6) Charge with a constant current of 0.05C to the charging cut-off voltage, and the charging cut-off voltage is 4.2V;

[0043] 7) Charge with a constant voltage at the charge cut-off voltage until the charge current is lower than 0.01C;

[0044] 8) Discharge to 3.7V with a constant current of 0.05C;

[0045] 9) In the range of 3.70-3.90V, charge and discharge 4 times with a constant current of 0.05C;

[0046] 10) Discharge at a constant current of 0.05C to 3.55V;

[0047] 11) In the range of 3.55-3.65V, charge and discharge 4 times with a constant current of 0.1C;

[0048] 12) Dis...

Embodiment 2

[0051] 1) Charge to 3.0V with a constant current of 0.02C;

[0052] 2) Charge to 3.55V with a constant current of 0.05C;

[0053] 3) In the range of 3.55-3.65V, charge and discharge 4 times with a constant current of 0.1C;

[0054] 4) Charge to 3.7V with a constant current of 0.1C;

[0055] 5) In the range of 3.70-3.90V, charge and discharge 4 times with a constant current of 0.05C;

[0056] 6) Charge with a constant current of 0.1C to the charging cut-off voltage, and the charging cut-off voltage is 4.3V;

[0057] 7) Charge with a constant voltage at the charge cut-off voltage until the charge current is lower than 0.01C;

[0058] 8) Discharge to 3.7V with a constant current of 0.1C;

[0059] 9) In the range of 3.70-3.90V, charge and discharge 4 times with a constant current of 0.1C;

[0060]10) Discharge at a constant current of 0.1C to 3.55V;

[0061] 11) In the range of 3.55-3.65V, charge and discharge 4 times with a constant current of 0.2C;

[0062] 12) Dischargin...

Embodiment 3

[0065] 1) Charge to 3.0V with a constant current of 0.01C;

[0066] 2) Charge to 3.55V with a constant current of 0.03C;

[0067] 3) In the range of 3.55-3.65V, charge and discharge 4 times with a constant current of 0.06C;

[0068] 4) Charge to 3.7V with a constant current of 0.06C;

[0069] 5) In the range of 3.70-3.90V, charge and discharge 4 times with a constant current of 0.02C;

[0070] 6) Charge with a constant current of 0.06C to the charging cut-off voltage, and the charging cut-off voltage is 4.25V;

[0071] 7) Charge with a constant voltage at the charge cut-off voltage until the charge current is lower than 0.01C;

[0072] 8) Discharge to 3.7V with a constant current of 0.06C;

[0073] 9) In the range of 3.70-3.90V, charge and discharge 4 times with a constant current of 0.05C;

[0074] 10) Discharge at a constant current of 0.1C to 3.55V;

[0075] 11) In the range of 3.55-3.65V, charge and discharge 4 times with a constant current of 0.15C;

[0076] 12) Di...

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Abstract

The invention provides a method for forming a lithium ion battery with a mixed electrode. The active material of the mixed electrode includes lithium nickel cobalt manganate and lithium iron phosphate. The lithium nickel cobalt manganate is LiNi0.6Co0.1Mn0.3O2. The lithium iron phosphate is LiMg0.02Fe0.98PO4. The mass ratio of the lithium nickel cobalt manganate to the lithium iron phosphate is 75:25 to 80:20. The method includes performing charge-discharge cycles in a range of 3.55 to 3.65V and performing charge-discharge cycles in a range of 3.70 to 3.90V. The formation method of the presentinvention can fully activate the electrochemical activity of the active material of the mixed electrode, and improve the charge-discharge efficiency and durability of the electrode.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries with mixed electrodes, in particular to a method for forming lithium ion batteries with mixed electrodes. Background technique [0002] In the power battery, there are high requirements for the energy density, safety and manufacturing cost of the battery, while the ternary material and lithium iron phosphate battery have good high temperature resistance and safety performance, and are the first choice as the active material of the power battery , and the mixed electrodes of different materials are beneficial to improve the energy density of lithium-ion batteries. However, due to the different working voltages of ternary materials and lithium iron phosphate, there will be two working platforms during the charge and discharge process, iron phosphate The working platform of lithium works at 3.6V, and the starting voltage and ending voltage of the platform are relatively close, and the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 蒋子杰
Owner 泰州纳新新能源科技有限公司
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