Method for forming hard carbon anode material lithium ion battery

A technology of lithium-ion batteries and formation methods, which is applied in the field of battery formation, and can solve problems affecting the cycle stability of hard carbon negative electrode materials lithium-ion batteries, potential safety hazards, and risks of lithium analysis

Active Publication Date: 2019-05-03
上海飞鸿创联新能源发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for forming hard carbon anode material lithium ion battery
  • Method for forming hard carbon anode material lithium ion battery
  • Method for forming hard carbon anode material lithium ion battery

Examples

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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, insert 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 the ...

Embodiment 2

[0054] A method for forming a hard carbon negative electrode material lithium-ion battery, which involves forming a battery that has been aged by liquid injection; the formation temperature is 25°C; the designed lithium intercalation gram capacity is 450mAh / g, and the target discharge depth is 382.5mAh / g;

[0055] The process of the chemical conversion treatment includes:

[0056] In the first week, lithium was intercalated to 450mAh / g at a rate of 0.2C, and then delithiated at a rate of 0.2C to 382.5mAh / g.

[0057] The preparation method of the liquid-injected aged battery is the same as that in Example 1.

[0058] With 0.5C magnification, the formation battery in embodiment 1 and 2 is charged and discharged 100 times, and the 100 cycle performance of the formation battery in research embodiment 1 and 2 is studied, and the results are as follows figure 2 shown. from figure 2 It can be seen that the irreversible Li in the positive electrode is reduced by gradually incre...

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Abstract

The invention provides a method for forming a hard carbon anode material lithium ion battery, and belongs to the technical field of battery formation. The formation method of the present invention isto carry out a formation treatment on a liquid-filled and aged battery. The formation treatment comprises performing charging to designed lithium-intercalated capacity per gram-discharging process N times until the discharge depth reaches 100% of a target discharge depth, wherein the designed lithium-intercalated capacity per gram is 350-700 mAh / g, the target discharge depth is 100% of the designed lithium-intercalated capacity per gram, the depth of the first discharge is 10 to 90% of the target discharge depth, and the depth of the Nth discharge is increased by 1 to 20% of the target discharge depth compared with the depth of the (N-1)th discharge, wherein the N >=2, and N is an integer. The method eliminates the irreversible lithium in a cycle process by controlling the target dischargedepth and the depth of each discharge, improves the lithium-intercalated platform of the hard carbon anode material, reduces the risk of lithium deposition, and improves the cycle stability of the hard carbon anode 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 Applications(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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