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Method for formation and capacity grading of lithium ion battery with silicon-carbon cathode

A lithium-ion battery and silicon carbon technology, applied in the field of lithium-ion batteries, can solve the problems of large volume expansion, battery swelling, cycle performance degradation, and electrolyte consumption, so as to reduce volume expansion, avoid electrolyte loss, and alleviate volume expansion. Effect

Active Publication Date: 2018-07-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large volume expansion of silicon-based negative electrode materials during charging and discharging, the SEI film is continuously broken and formed, resulting in continuous consumption of electrolyte, battery swelling and severe degradation of cycle performance.

Method used

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  • Method for formation and capacity grading of lithium ion battery with silicon-carbon cathode
  • Method for formation and capacity grading of lithium ion battery with silicon-carbon cathode

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A lithium ion battery formation and capacity method using silicon carbon as the negative electrode, comprising the steps of:

[0028] S1. Place the unsealed iron-lithium battery cell on the cabinet after the injection and aging for formation; the temperature during the formation process is greater than or equal to 25°C, and the dew point temperature is less than or equal to -10°C; to 0.02C, and then use a large current to form it for 2 hours, and the charging rate is 0.2C to obtain the first battery cell;

[0029] S2. Perform high-temperature aging treatment on the first battery cell for 12 hours, the temperature of the high-temperature aging treatment is 45°C, and the vacuum degree of the high-temperature aging treatment is -90kPa, to obtain the second battery cell;

[0030] S3. Transfer the second battery cell to the liquid injection room, exhaust, replenish liquid, and stand at room temperature for 12 hours to obtain the third battery cell;

[0031] S4. Put the thir...

Embodiment 2

[0034] A lithium ion battery formation and capacity method using silicon carbon as the negative electrode, comprising the steps of:

[0035] S1. Put the unsealed ternary batteries after injection and aging into the cabinet for formation; the temperature during the formation process is greater than or equal to 25°C, and the dew point temperature is less than or equal to -10°C; the specific operation of the formation is as follows: first, use a small current to form for 4 hours, charge The rate is 0.02C, and then the high current is used for 2 hours, and the charge rate is 0.2C, and the first cell is obtained;

[0036] S2. Perform high-temperature aging treatment on the first battery cell for 12 hours, the temperature of the high-temperature aging treatment is 45°C, and the vacuum degree of the high-temperature aging treatment is -90kPa, to obtain the second battery cell;

[0037] S3. Transfer the second battery cell to the liquid injection room, exhaust, replenish liquid, and s...

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Abstract

The invention discloses a method for formation and capacity grading of a lithium ion battery with a silicon-carbon cathode. The method comprises the following steps: feeding a battery cell which is not sealed after electrode injection and aging onto a cabinet, and performing formation so as to obtain a first battery cell; performing high-temperature aging treatment on the first battery cell so asto obtain a secondary battery cell; transferring the second battery cell into an electrolyte injection room, exhausting gases, replenishing electrode, and leaving to standard so as to obtain a third battery cell; feeding the third battery cell onto the cabinet, and performing capacity grading so as to obtain a fourth battery cell; vacuuming and exhausting air of the fourth battery cell, replenhsing electrode, sealing, and leaving to stand. By adopting the method for formation and capacity grading of the lithium ion battery with the silicon-carbon cathode, gases generated in the formation process can be effectively alleviated and eliminated, electrolyte loss in former steps of the circulation process can be avoided, swelling of the battery in the recharge and discharge process can be reduced, and the circulation properties of the battery can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composition and capacity method of a lithium ion battery using silicon carbon as a negative electrode. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life, wide operating temperature range, wide operating voltage range, low self-discharge rate, high efficiency and high specific energy, and no memory effect. They have been widely used in many industries such as electronics and automobiles. . The formation step of lithium-ion batteries is an important stage in the manufacture of batteries. The formation is related to the quality of the battery's capacity, cycle life, and safety performance. Among the many processes of battery production, formation is a particularly important part. Its main purpose is to form a layer of solid electrolyte film (SEI film) on the surface of the electrode material during the first charging process....

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 张宝张开
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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