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Positive electrode lithium supplement additive and preparation method thereof

An additive and lithium-replenishing technology, applied in the field of lithium-ion batteries, can solve the problems of inability to make full use of lithium ions, poor compatibility, and low pre-lithiation efficiency.

Pending Publication Date: 2021-04-27
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the existing pre-lithiation technology, the materials used are relatively high in activity, poor in stability, sensitive to oxygen and moisture, have high environmental requirements during transportation and use, and cannot be stored in the air for a long time. The existing mature lithium-ion battery processing technology has poor compatibility
The existing lithium supplement additives have low pre-lithiation efficiency and cannot make full use of the lithium ions introduced by them
In addition, the introduction of lithium-supplementing materials with poor conductivity may also increase the impedance of the battery cell, while lithium-supplementing materials containing heterogeneous metals have the risk of metal dissolution

Method used

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  • Positive electrode lithium supplement additive and preparation method thereof

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Embodiment 1

[0034] This embodiment provides a method for preparing a positive electrode lithium supplement additive, the preparation method comprising:

[0035] Metal lithium is heated to 180°C under vacuum conditions to melt, with a pore diameter of 5nm, a pore volume of 0.4ml / g, and a specific surface area of ​​2230m 2 / g of carbon nanotubes are mixed, and the temperature is raised to 300°C at a rate of 2°C / min, so that molten lithium can penetrate into the pores of the porous carbon material;

[0036] After the molten lithium has infiltrated completely, at a rate of 1m 3 Nitrogen gas was fed into the mixture / min to react for 60 minutes. After the reaction, the mixture was cooled under an argon atmosphere to obtain the positive electrode lithium supplement additive, and the content of the porous carbon material in the positive electrode lithium supplement additive was 70 wt%.

Embodiment 2

[0038] This embodiment provides a method for preparing a positive electrode lithium supplement additive, the preparation method comprising:

[0039] Metal lithium is heated to 180°C to melt under vacuum conditions, with a pore diameter of 10 μm, a pore volume of 2.8ml / g, and a specific surface area of ​​103m 2 / g of carbon nanotubes are mixed, and the temperature is raised to 250° C. at a rate of 2° C. / min, so that molten lithium is infiltrated into the pores of the porous carbon material;

[0040] After the molten lithium has infiltrated completely, at a rate of 1m 3 Nitrogen gas was fed into the mixture / min to react for 10 minutes. After the reaction, the mixture was cooled under an argon atmosphere to obtain the positive electrode lithium supplement additive, and the content of the porous carbon material in the positive electrode lithium supplement additive was 20 wt%.

Embodiment 3

[0042] This embodiment provides a method for preparing a positive electrode lithium supplement additive, the preparation method comprising:

[0043] Metal lithium is heated to 180°C to melt under vacuum conditions, with a pore diameter of 10 μm, a pore volume of 2.8ml / g, and a specific surface area of ​​103m 2 / g of carbon nanotubes are mixed, and the temperature is raised to 300°C at a rate of 2°C / min, so that molten lithium can penetrate into the pores of the porous carbon material;

[0044] After the molten lithium has infiltrated completely, at a rate of 1m 3 Oxygen was introduced into the reaction mixture for 30 minutes per minute, and after the reaction was completed, it was cooled under an argon atmosphere to obtain the positive electrode lithium supplement additive, and the content of the porous carbon material in the positive electrode lithium supplement additive was 15 wt%.

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Abstract

The invention provides a positive electrode lithium supplement additive and a preparation method thereof. The lithium supplement additive comprises a porous carbon material and an inorganic lithium compound distributed in the porous carbon material. The preparation method comprises the following steps: melting metal lithium under a vacuum condition, mixing molten metal lithium with a porous carbon material, and enabling the molten lithium to permeate into pores of the porous carbon material under a heating condition; and after the molten lithium completely permeates into the pores, introducing reaction gas for reaction, and performing cooling in a protective atmosphere after the reaction is finished to obtain the positive electrode lithium supplement additive. The positive electrode lithium supplement additive is high in stability, high in pre-lithiation efficiency, good in electronic conductivity and high in compatibility with an existing lithium ion battery manufacturing process.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a positive electrode lithium supplement additive and a preparation method thereof. Background technique [0002] Lithium-ion batteries are one of the most important components of new energy vehicles. In order to meet the needs of the rapid development of electric vehicles, it is necessary to develop the next generation of advanced electrode active materials with higher gravimetric and volumetric capacities to achieve higher gravimetric and volumetric energy densities . However, most of these materials suffer from the high loss of active lithium in the first cycle. During the first week of charging, the active lithium in the positive electrode undergoes an irreversible side reaction on the surface of the negative electrode to form a solid electrolyte interfacial layer (SEI), which cannot be reversibly returned to the positive electrode during the subsequent discharge process. ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 郭飞鹄其他发明人请求不公开姓名
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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