A kind of formation method of hard carbon negative electrode material lithium ion battery

A technology of lithium-ion batteries and formation methods, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, secondary battery repair/maintenance, etc., can solve the risk of lithium analysis, the existence of potential safety hazards, and the impact on the cycle of hard carbon negative electrode materials lithium-ion batteries Stability and other issues, to achieve the effect of reducing the risk of lithium analysis, improving the lithium potential platform, and excellent cycle stability

Active Publication Date: 2020-06-09
上海飞鸿创联新能源发展有限公司
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Problems solved by technology

However, according to the capacity of hard carbon materials, microporous lithium storage may cause the potential of negative electrode materials to be lower than 0V during the process of lithium insertion, and there is a risk of lithium analysis in kinetics, and there is a safety hazard in the charging process; at the same time, it will affect hard carbon negative electrode materials. Lithium-ion battery cycle stability

Method used

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  • A kind of formation method of hard carbon negative electrode material lithium ion battery
  • A kind of formation method of hard carbon negative electrode material lithium ion battery
  • A kind of formation method of hard carbon negative electrode material lithium ion battery

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preparation example Construction

[0026] In the embodiment of the present invention, the preparation method of the liquid-injected and aged battery preferably includes: according to the manufacturing process of the conventional button battery, the metal lithium sheet is used as the counter electrode, that is, the negative electrode in the button battery.

[0027] According to the conventional button battery manufacturing process, the hard carbon negative electrode material, conductive agent SP, and binder SBR / CMC are prepared into a slurry, which is evenly and continuously coated on the copper foil, dried and rolled to form a positive electrode. Pole piece: The mass ratio of the hard carbon, SP, SBR and CMC is preferably 95:2:2:1.

[0028] The positive and negative pole pieces, electrolyte and separator were assembled into a button battery, and then aged at 25°C for 24 hours to obtain a liquid-injected aged battery.

[0029] In the present invention, the battery that has been aged by liquid injection is subjec...

Embodiment 1

[0037] A method for the formation of a hard carbon negative electrode material lithium-ion battery, performing formation treatment on the battery that has been aged by liquid injection; the formation temperature is 25°C; the designed lithium intercalation gram capacity (hereinafter referred to as SOC) is 450mAh / g, The target depth of discharge (hereinafter referred to as DOD) is 450mAh / g;

[0038] The process of the chemical conversion treatment includes:

[0039] Intercalate lithium at a rate of 0.2C to 100% SOC in the first week, and then delithiate at a rate of 0.2C to 55% DOD;

[0040] In the second week, intercalate lithium at a rate of 0.2C to 100% SOC, and then delithiate at a rate of 0.2C to 60% DOD;

[0041] In the third week, intercalate lithium at a rate of 0.2C to 100% SOC, and then delithiate at a rate of 0.2C to 65% DOD;

[0042] In the fourth week, intercalate lithium at a rate of 0.2C to 100% SOC, and then delithiate at a rate of 0.2C to 70% DOD;

[0043] In...

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Abstract

The invention provides a method for forming a hard carbon negative electrode material lithium ion battery, belonging to the technical field of battery formation. The formation method of the present invention is to perform formation treatment on the battery that has been aged by liquid injection; the process of the formation treatment includes: charging to the designed lithium intercalation gram capacity-discharging process N times until the discharge depth reaches 100% of the target discharge depth; The designed lithium intercalation gram capacity is 350-700mAh / g, the target discharge depth is 100% of the designed lithium intercalation gram capacity; the depth of the first discharge is 10-90% of the target discharge depth, and the depth of the Nth discharge is compared to The depth of the N-1th discharge is increased by 1 to 20% of the target discharge depth; N≥2, where N is an integer. The present invention eliminates irreversible lithium in the cycle process by controlling the target discharge depth and each discharge depth, improves the lithium intercalation platform of the hard carbon negative electrode material, reduces the risk of lithium analysis, and improves the cycle stability of the hard carbon negative electrode material lithium ion battery .

Description

technical field [0001] The invention relates to the technical field of battery formation, in particular to a formation method of a hard carbon negative electrode material lithium ion battery. Background technique [0002] Soft-pack lithium-ion batteries are widely used in energy storage, aerospace, transportation power, 3C and other fields due to their light weight, small size, high specific energy and safety. [0003] Due to the large volume expansion of silicon-carbon anode materials during the charge-discharge cycle, there are certain limitations in the use process. Hard carbon material is a negative electrode material for lithium-ion secondary batteries. Hard carbon material is expected to be an alternative material in the industrialization of graphite and silicon carbon negative electrode materials. Using the microporous lithium storage technology of hard carbon materials, hard carbon materials can have a gram capacity of 500mAh / g to 1000mAh / g. However, according to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/058
CPCY02E60/10Y02P70/50
Inventor 栗西亮李涛
Owner 上海飞鸿创联新能源发展有限公司
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