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Formation method for prolonging cycle life of silicon-carbon soft package lithium ion battery

A lithium-ion battery, cycle life technology, applied to secondary batteries, electrochemical generators, secondary battery charging/discharging, etc., can solve the problems of fast cycle attenuation, large expansion coefficient, etc., and achieve expansion inhibition and strong stability , reducing the effect of the migration path

Active Publication Date: 2020-08-28
CAMEL GRP NEW ENERGY BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of silicon carbon anode materials is that the material expansion coefficient is large, and the later cycle decays faster

Method used

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  • Formation method for prolonging cycle life of silicon-carbon soft package lithium ion battery

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Embodiment 1

[0026] A method for improving the cycle life of a silicon-carbon soft-packed lithium-ion battery, comprising the following steps:

[0027] Step 1: Use temperature control equipment to set the required temperature, and perform low-temperature static treatment on the battery cells for 12 hours;

[0028] Step 2: Pressurize the cell during the formation process;

[0029] Step 3: Carry out gradient small rate charging to the battery cell;

[0030] The overall ambient temperature is: 15°C;

[0031] The pressurization pressure of the cell is: 0.4 Mpa.

[0032] The specific steps of charging the battery cell at a gradient small rate are as follows:

[0033] The first stage: constant current charging, charging to 10% of the reversible capacity, charging current is 0.02C;

[0034] The second stage: constant current charging, charging to 30% of the reversible capacity, charging current is 0.08C;

[0035] The third stage: constant current charging, charging to 30% of the reversible c...

Embodiment 2

[0042] A method for improving the cycle life of a silicon-carbon soft-packed lithium-ion battery, comprising the following steps:

[0043] Step 1: Use temperature control equipment to set the required temperature, and perform low-temperature static treatment on the battery cells for 20 hours;

[0044] Step 2: Pressurize the cell during the formation process;

[0045] Step 3: Carry out gradient small rate charging to the battery cell;

[0046] The overall ambient temperature is: 0°C.

[0047] The pressurization pressure of the cell is: 0.6 Mpa.

[0048] The specific steps of charging the battery cell at a gradient small rate are as follows:

[0049] The first stage: constant current charging, charging to 15% of the reversible capacity, charging current is 0.03C;

[0050] The second stage: constant current charging, charging to 20% of the reversible capacity, charging current is 0.05C;

[0051] The third stage: constant current charging, charging to 40% of the reversible ca...

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PUM

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Abstract

The invention discloses a formation method for prolonging the cycle life of a silicon-carbon soft package lithium ion battery. The formation method comprises the following steps: performing low-temperature standing treatment on a battery core by adopting temperature control equipment; pressurizing the battery core; carrying out gradient small-rate charging on the battery core, wherein charging iscarried out at a first stage till the reversible capacity is 6%-15% and the charging current ranges from 0.02 C to 0.05 C, charging is carried out at a second stage until the reversible capacity is 20%-40% and the charging current ranges from 0.05 C to 0.2 C, and charging is carried out at a third stage until the reversible capacity is 30%-60% and the charging current ranges from 0.1 C to 0.6 C; standing; aging; and carrying out air sucking, and packaging. According to the invention, the problems that the silicon-carbon material is easy to expand to affect the cycle performance of the silicon-carbon material and the like in the prior art are solved, and the compactness, stability and consistency of the SEI film of the silicon-carbon soft package lithium ion battery are improved by adoptingthe process disclosed by the invention, so that the expansion of the silicon-carbon negative electrode material in the cycle process is inhibited to a certain extent, and the cycle performance of thebattery is improved.

Description

technical field [0001] The invention belongs to the technical field of soft-pack lithium-ion battery manufacturing, and specifically relates to a method for forming a silicon-carbon soft-pack lithium-ion battery, which is suitable for the formation process of a silicon-carbon soft-pack lithium-ion battery and can significantly improve its cycle performance. Background technique [0002] Affected by the increasingly serious energy crisis and increasing environmental pollution pressure, the development of new energy vehicles is the only way for the development of my country's automobile industry. As an energy storage and supply device, the power battery is the core component of new energy vehicles. Lithium-ion batteries have become the first choice for power batteries due to their high energy density, long cycle life, and environmental friendliness. [0003] At present, the improvement of the mileage of lithium-ion batteries is the focus of attention, so it is necessary to de...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/44
CPCH01M10/0525H01M10/446Y02E60/10
Inventor 张巧灵张宝华娄勇刚李新华许晓婵金鑫
Owner CAMEL GRP NEW ENERGY BATTERY CO LTD
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