A kind of formation method of lithium ion battery

A technology of lithium-ion battery and chemical formation method, which is applied in the direction of secondary battery, electrochemical generator, secondary battery maintenance/maintenance, etc. It can solve the problems that the performance of additives is difficult to exert, affect the battery cycle life, and the effect is difficult to be improved. Achieve the effects of avoiding cycle life decline, avoiding excessive temperature rise, and avoiding voltage polarization

Active Publication Date: 2021-05-28
广州明美新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the field of lithium-ion batteries, high-nickel cathode materials have the advantages of high working voltage and high energy density, and are commonly used materials for power lithium-ion batteries. However, high-nickel materials have poor cycle performance at high temperatures due to their high nickel content. , even if the film-forming agent FEC or VC commonly used in this field is added, its effect is still difficult to be improved, and the inventors have found through research that additives such as FEC and VC are easily decomposed on the surface of high-nickel positive electrode materials, resulting in difficult performance of the additives. play, and the gas produced will affect the cycle life of the battery, so in view of the above problems, the following chemical formation method is proposed

Method used

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  • A kind of formation method of lithium ion battery
  • A kind of formation method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]1) Composition the negative electrode and the lithium sheet to the experimental cell, placed in the first electrolyte, the first electrolyte contains 1% FEC and 4% VC;

[0031]2) A current constant flow of 0.01c to 0.3V, then discharged from 0.1c to 0.1V, then charge the current constant flow of 0.1c to 0.3V, then charge it to 0.8V at 0.01c constant current ; Repeat the above process 3 times;

[0032]3) Adjust the experimental battery voltage of 0.8V until the charging current is below 0.01c;

[0033]4) Remove the negative electrode, constitute a battery with the positive electrode and the diaphragm to implant the second electrolyte;

[0034]5) Charged from 0.05 C to 3.4 V, constant pressure under this voltage until the charging current is below 0.01c;

[0035]6) Charged by a current constant flow of 0.1 C to 3.7V, charged under the voltage until the charging current is below 0.01c;

[0036]7) Adjust the battery temperature of 5 degrees Celsius;

[0037]8) Pulse charge, the pulse current is 0.1c, ...

Embodiment 2

[0041]1) Composition the negative electrode and the lithium sheet to the experimental cell, placed in the first electrolyte, containing a volume fraction of 3% FEC and 1% VC;

[0042]2) A current constant flow of 0.05c to 0.3V, then discharged from 0.5c current constant flow charge, then charge to 0.3V at a current of 0.5C, then charge it to 0.8V at 0.05c constant current ; Repeat the above process 3 times;

[0043]3) Adjust the experimental battery voltage of 0.8V until the charging current is below 0.01c;

[0044]4) Remove the negative electrode, constitute a battery with the positive electrode and the diaphragm to implant the second electrolyte;

[0045]5) Charged by a current constant flow of 0.1 C to 3.5V, and the constant pressure is charged under the voltage until the charging current is below 0.01c;

[0046]6) Charged by a current constant flow of 0.2 C to 3.8V, and the constant pressure is charged under the voltage until the charging current is below 0.01c;

[0047]7) Adjust the battery temp...

Embodiment 3

[0052]1) Composition of the negative electrode and the lithium sheet to the experimental cell, placed in the first electrolytic solution, containing a volume fraction of 2% of the FEC and 3% VC;

[0053]2) A current constant flow of 0.02c to 0.3V, then discharged from 0.2 C to 0.1V, then charge the current constant flow of 0.2c to 0.3V, then charge it to 0.8V at 0.02C. ; Repeat the above process 3 times;

[0054]3) Adjust the experimental battery voltage of 0.8V until the charging current is below 0.01c;

[0055]4) Remove the negative electrode, constitute a battery with the positive electrode and the diaphragm to implant the second electrolyte;

[0056]5) Charged by a current constant flow of 0.08c to 3.5V, and the constant pressure is charged under the voltage until the charging current is below 0.01c;

[0057]6) Charged by a current constant flow of 0.15c to 3.75 V, constant pressurized under the voltage until the charging current is below 0.01c;

[0058]7) Adjust the battery temperature of 10 deg...

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Abstract

The invention provides a method for forming a lithium-ion battery. The lithium-ion battery includes a positive electrode and a negative electrode. The positive electrode includes a positive electrode active material mainly composed of nickel, specifically LiNi x m 1‑ x o 2 , x≥0.5, the negative electrode includes a graphite-based negative electrode active material, and the formation method includes first forming an experimental battery with the negative electrode and a lithium sheet, pre-forming in the first electrolyte, and after the formation is completed, combining the formed negative electrode with The positive electrode is assembled into a battery, and the second electrolyte solution is injected for formation. The first electrolyte solution contains FEC and VC, the total content of which is not more than 5%; the second electrolyte solution does not contain FEC and VC, and the lithium ion battery obtained by the chemical conversion method of the present invention has better high temperature stability and cycle life.

Description

Technical field[0001]The present invention relates to a method of formulating a lithium ion battery, and more particularly to a method of formulating a lithium ion battery comprising a positive electrode active substance containing high nickel.Background technique[0002]In the field of lithium ion battery, the positive material of the high nickel has the advantages of high operating voltage, high energy density, and is a common material for power lithium ion batteries, but the high-nickel material is high, the cycle performance at high temperatures is poor. Even if the film forming agent FEC or VC commonly used in the art is added, the effect is still difficult to obtain improved, and the inventors have been studied that additives such as FEC and VC are easily decomposed on the surface of the high-nor-nickel positive material, resulting in difficulty in the performance of the additive. Play, and the resulting gas will affect the battery's cycle life, so the following is proposed to m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/0525H01M10/446Y02E60/10
Inventor 金妍
Owner 广州明美新能源股份有限公司
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