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Method for improving electrochemical performance of lithium-rich manganese-based lithium ion battery

A lithium-rich manganese-based lithium ion battery technology, applied in electrochemical generators, secondary battery charging/discharging, secondary batteries, etc., to improve the process, increase the first reversible capacity, and improve the electrochemical performance.

Pending Publication Date: 2022-07-22
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems existing in the existing lithium-rich manganese-based materials, the present invention provides a method for improving gas production and poor cycle stability of lithium-rich manganese-based lithium-ion batteries under high voltage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Positive plate production:

[0056] Lithium-rich manganese-based material, conductive carbon black, and polyvinylidene fluoride were mixed in a mass ratio of 96:2:2; polyvinylidene fluoride (molecular weight 1.3 million) was dissolved in N-methylpyrrolidone solvent to prepare 7% Glue, then add conductive carbon black, add lithium-rich manganese-based material after the dispersion is complete, until the slurry is mixed and dispersed uniformly, add N-methylpyrrolidone to adjust the viscosity to 5000-8000cp. Then, the mixed slurry was evenly coated on an aluminum foil with a thickness of 12 μm, and the surface density of the coating on both sides was 40 mg / cm 2 , and rolling and slitting to obtain a positive electrode sheet.

[0057] Negative plate production:

[0058] The mixture of silicon oxycarbon material and artificial graphite (the mass fraction of silicon is 15%), conductive carbon black, sodium carboxymethyl cellulose, and styrene-butadiene rubber are mixed in a...

Embodiment 2

[0077] The process of obtaining the lithium-rich manganese-based lithium-ion battery after liquid injection and aging is exactly the same as that in Example 1.

[0078] This embodiment provides a method for improving the electrochemical performance of a lithium-rich manganese-based lithium-ion battery, the method includes performing pressure formation on the cells of the lithium-rich manganese-based lithium ion battery after liquid injection and aging, and the pressure formation pressure range 10kg / cm 2 , the specific steps of pressure formation are as follows:

[0079] S1) carry out constant current charging with a current of 0.1C, and the time of constant current charging is 60min;

[0080] S2) constant current charging with a current of 0.5C until the battery voltage reaches 4.2V;

[0081] S3) carry out constant voltage charging under the voltage of 4.2V, and the time of constant voltage charging is 60min;

[0082] S4) stand, the standstill time is 10min;

[0083] S5) d...

Embodiment 3

[0095] The process of obtaining the lithium-rich manganese-based lithium-ion battery after liquid injection and aging is exactly the same as that in Example 1.

[0096] The present embodiment provides a method for improving the electrochemical performance of a lithium-rich manganese-based lithium ion battery, the method includes performing pressure formation on the cells of the lithium-rich manganese-based lithium ion battery after liquid injection and aging, and the pressure formation pressure range 8kg / cm 2 , the specific steps of pressure formation are as follows:

[0097] S1) carry out constant current charging with a current of 0.05C, and the time of constant current charging is 40min;

[0098] S2) constant current charging with a current of 0.4C until the battery voltage reaches 4.0V;

[0099] S3) carry out constant voltage charging under the voltage of 4.0V, and the time of constant voltage charging is 50min;

[0100] S4) stand still, the time of standstill is 8min; ...

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Abstract

The invention relates to a method for improving the electrochemical performance of a lithium-rich manganese-based lithium ion battery, and the method comprises the following steps: carrying out pressure formation on a battery cell of the lithium-rich manganese-based lithium ion battery after liquid injection and aging: S1) carrying out constant-current charging with a current I1; s2) carrying out constant-current charging at a current I2 until the voltage of the battery reaches V1; s3) carrying out constant-voltage charging under the voltage V1; s4) standing; s5) discharging at the current I2 until the voltage of the battery reaches cut-off voltage; s6) carrying out constant-current charging at the current I3 until the voltage of the battery reaches V2; s7) carrying out constant-voltage charging under the voltage V2; s8) standing and aging; s9) discharging at the current I3 until the voltage of the battery reaches cut-off voltage; s10) carrying out constant-current charging at the current I4 until the voltage of the battery reaches V3; s11) carrying out constant-voltage charging under the voltage V3; s12) standing is carried out; and S13) discharging at the current I4 until the voltage of the battery reaches the cut-off voltage.

Description

technical field [0001] The invention relates to the field of chemical batteries, in particular to a method for improving the electrochemical performance of a lithium-rich manganese-based lithium ion battery. Background technique [0002] Lithium-ion secondary batteries are more and more widely used in mobile phones, UPS power supplies, notebook computers, electric bicycles and electric vehicles. At present, the demand for lithium-ion batteries with high specific energy density is increasing, which puts forward higher requirements for the performance of lithium-ion batteries such as specific capacity, specific power, and cycle life. [0003] The main component of the lithium-rich manganese-based material is manganese, which contains a small amount of nickel and almost no cobalt. The lithium-rich manganese-based material has a high theoretical gram capacity (≥250mAh / g). Cathode materials can improve the energy density of lithium-ion secondary batteries, and lithium-rich manga...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/42H01M10/0525
CPCH01M10/44H01M10/42H01M10/0525
Inventor 郗万宝洪斯凡王理
Owner EVE ENERGY CO LTD
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