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Preparation method of tin-based lithium ion battery negative electrode material

A negative electrode material and ion battery technology, applied in the direction of battery electrodes, negative electrodes, nanotechnology for materials and surface science, etc., can solve the irreversible capacity loss of metal tin, the loss of electrode active materials, the increase of internal resistance of the electrode system, etc. problems, to achieve the effect of improving electrochemical performance, increasing conductivity, and reducing charge transfer resistance

Inactive Publication Date: 2021-03-19
陈兆佳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, many reasons can cause very serious irreversible capacity loss of metal tin
First of all, the lithium-poor phase has a high formation energy, and it is difficult to remove the intercalated lithium during the first cycle charge-discharge test, which leads to the irreversible occurrence of the first cycle.
Secondly, in the continuous cycle process, the conductivity of the tin-lithium alloy formed by the alloying reaction of tin and lithium is poor, and the internal resistance of the electrode system will increase accordingly, resulting in the phenomenon of incomplete detachment, so that a part of the electrode active material will be released. loss, resulting in irreversible capacity

Method used

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  • Preparation method of tin-based lithium ion battery negative electrode material
  • Preparation method of tin-based lithium ion battery negative electrode material
  • Preparation method of tin-based lithium ion battery negative electrode material

Examples

Experimental program
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Embodiment 1

[0030] A preparation method of a tin-based lithium ion battery negative electrode material, specifically comprising the following steps:

[0031] S1: Add selenium dioxide and tin dichloride to the high-temperature reactor, wherein the molar ratio of selenium dioxide and tin dichloride is 1:0.45, and then add deionized water and N with a volume ratio of 1:1.5 -Methylpyrrolidone, sonicate and stir to make it fully dispersed.

[0032] S2: Add copper nitrate powder and graphene to the beaker, then add deionized water, and ultrasonically stir at room temperature to make it fully dispersed, wherein the copper nitrate powder and graphene added are proportional to the tin powder in step S1, which The molar ratio of tin powder to copper nitrate powder and graphene is 1:0.32:0.08.

[0033] S3: Add the solution in step S2 to the solution in step S1, then ultrasonically stir again for 15 minutes, put the autoclave in an oven, react at 185°C for 26 hours, then take it out and let it air t...

Embodiment 2

[0035] A preparation method of a tin-based lithium ion battery negative electrode material, specifically comprising the following steps:

[0036] S1: Add selenium dioxide and tin dichloride to the high-temperature reactor, wherein the molar ratio of selenium dioxide and tin dichloride is 1:0.6, and then add deionized water and N with a volume ratio of 1:3 -Methylpyrrolidone, sonicate and stir to make it fully dispersed.

[0037] S2: Add copper nitrate powder and graphene to the beaker, then add deionized water, and ultrasonically stir at room temperature to make it fully dispersed, wherein the copper nitrate powder and graphene added are proportional to the tin powder in step S1, which The molar ratio of tin powder to copper nitrate powder and graphene is 1:0.45:0.15.

[0038]S3: Add the solution in step S2 to the solution in step S1, then ultrasonically stir again for 15 minutes, put the autoclave in an oven, react at 185°C for 26 hours, then take it out and let it air to ro...

Embodiment 3

[0040] A preparation method of a tin-based lithium ion battery negative electrode material, specifically comprising the following steps:

[0041] S1: Add selenium dioxide and tin dichloride to the high-temperature reactor, wherein the molar ratio of selenium dioxide and tin dichloride is 1:0.5, and then add deionized water and N with a volume ratio of 1:2 -Methylpyrrolidone, sonicate and stir to make it fully dispersed.

[0042] S2: Add copper nitrate powder and graphene to the beaker, then add deionized water, and ultrasonically stir at room temperature to make it fully dispersed, wherein the copper nitrate powder and graphene added are proportional to the tin powder in step S1, which The molar ratio of tin powder to copper nitrate powder and graphene is 1:0.35:0.1.

[0043] S3: Add the solution in step S2 to the solution in step S1, then ultrasonically stir again for 15 minutes, put the autoclave in an oven, react at 200°C for 26 hours, then take it out and let it air to ro...

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Abstract

The invention discloses a preparation method of a tin-based lithium ion battery negative electrode material. The method comprises the following steps: adding a certain amount of selenium powder and tin powder into a high-temperature reaction kettle, adding a certain amount of solvent I, carrying out ultrasonic treatment and stirring, adding copper powder and graphene into a beaker, adding a certain amount of solvent II, carrying out ultrasonic stirring at room temperature, putting the high-pressure reaction kettle into a drying oven, performing reacting for a period of time at a certain temperature, performing washing with deionized water and an absolute ethyl alcohol solution, and finally performing drying at 85 DEG C for 10 hours to obtain the required negative electrode material. Through a charge-discharge cycle test, the specific discharge capacity of the negative electrode material can still reach 264 mAh g<-1> after 100 cycles.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery negative electrode materials, and in particular relates to a preparation method of tin-based lithium-ion battery negative electrode materials. Background technique [0002] In recent years, with the continuous acceleration of the industrialization of today's society and the continuous increase of the population, the consumption of fossil energy such as oil and natural gas has continued to increase. Extensive use of fossil energy will lead to continuous deterioration of the ecological environment. therefore. For the sustainable development of the world, it is imminent to develop a resource that is clean, efficient, low-cost and can effectively replace traditional fossil energy. New energy sources such as solar energy, wind energy, and tidal energy that have attracted much attention have the advantages of being green, clean, environmentally friendly, and recyclable. However, these...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/387H01M4/624H01M4/626H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 陈兆佳李伟翔
Owner 陈兆佳