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Preparation method of lithium ion battery negative electrode material

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as safety accidents, battery explosions and fires, and achieve the effects of convenient operation and control, stable quality, and simple process

Inactive Publication Date: 2015-06-03
MCNAIR TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commercial lithium-ion batteries generally use graphite as the negative electrode material, but graphite is in a metastable state after lithium intercalation, so the lithium-ion battery using it as the negative electrode will explode and catch fire after violent collision or acupuncture, causing safety accidents

Method used

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  • Preparation method of lithium ion battery negative electrode material
  • Preparation method of lithium ion battery negative electrode material
  • Preparation method of lithium ion battery negative electrode material

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Experimental program
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Embodiment 1

[0032] A preparation method for a negative electrode material of a lithium ion battery, comprising the steps of:

[0033] A, the synthesis of copper-tin alloy:

[0034] A1, sodium borohydride and ammonium citrate are made into mixed solution, obtain solution A;

[0035] A2, add nanometer copper powder in solution A, stir evenly, obtain solution B;

[0036] A3, add tin chloride solution in solution B, react to obtain precipitation, precipitate is filtered, wash and dry, obtain copper-tin alloy;

[0037] B. Synthesis of negative electrode materials:

[0038] B1, get copper-tin alloy and sulfur powder to mix, obtain mixture;

[0039] B2, heating the mixture under the protection of nitrogen to react to obtain the negative electrode material.

[0040] In the step A1, the molar ratio of sodium borohydride and ammonium citrate is 2:1.

[0041] In the step A1, the total molar concentration of sodium borohydride and ammonium citrate is 0.5mol / L.

[0042] In the step A2, the parti...

Embodiment 2

[0052] The difference between this embodiment and the above-mentioned embodiment 1 is: in the step A1, the molar ratio of sodium borohydride and ammonium citrate is 1:1.

[0053] In the step A1, the total molar concentration of sodium borohydride and ammonium citrate is 0.1mol / L.

[0054] In the step A2, the particle size of the nano-copper powder is 500nm.

[0055] In the step A2, the amount of nano-copper powder is 0.4 times the molar mass of sodium borohydride.

[0056] In the step A3, the content of copper in the copper-tin alloy is 26.4wt%, and the content of tin is 73.6wt%.

[0057] In the step A3, the amount of hydrochloric acid is 1% of the water volume, and the amount of tin chloride pentahydrate is 0.6 times the molar mass of the nano-copper powder.

[0058] In the step B1, the amount of sulfur powder is 3 times the molar mass of the copper-tin alloy.

[0059] In the step B2, the heating adopts a two-stage heating method, and the mixture is heated at 150° C. for 1...

Embodiment 3

[0062] In the step A1, the molar ratio of sodium borohydride and ammonium citrate is 3:1.

[0063] In the step A1, the total molar concentration of sodium borohydride and ammonium citrate is 1mol / L.

[0064] In the step A2, the particle size of the nano-copper powder is 10000nm.

[0065] In the step A2, the amount of nano-copper powder is 0.8 times the molar mass of sodium borohydride.

[0066] In the step A3, the content of copper in the copper-tin alloy is 51.8wt%, and the content of tin is 48.2wt%.

[0067] In the step A3, the amount of hydrochloric acid is 3% of the water volume, and the amount of tin chloride pentahydrate is 1.0 times the molar mass of the nano-copper powder.

[0068] In the step B1, the amount of sulfur powder is 5 times the molar mass of the copper-tin alloy.

[0069] In the step B2, the heating adopts a two-stage heating method, the mixture is first heated at 160° C. for 1 h, and then heated at 450° C. for 0.5 h.

[0070] A lithium ion battery nega...

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Abstract

The invention relates to the technical field of a lithium ion battery, and particularly relates to a preparation method of a lithium ion battery negative electrode material. The preparation method comprises the following steps: A. synthesizing copper-tin alloy: A1. mixing sodium borohydride and ammonium citrate to form a mixed solution so as to obtain a solution A; A2. arranging nano copper powder into the solution A, and uniformly stirring the solution to obtain a solution B; and A3. arranging a tin chloride solution into the solution B, reacting to obtain precipitates, filtering the precipitates, and washing and drying the precipitates to obtain copper-tin alloy; and B. synthesizing the negative electrode material: B1. mixing the copper-tin alloy with sulfur powder to obtain a mixture; and B2. heating the mixture under the protection of nitrogen, and reacting to obtain the negative electrode material. According to the preparation process, the process is simple, the operate and control are convenient, the quality is stable, safety and reliability are achieved and industrialized mass production can be realized.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries have excellent cycle performance, fast charging and discharging, charging efficiency up to 100%, high output power, long service life, and no toxic and harmful substances. They are called green batteries. At present, commercial lithium-ion batteries generally use graphite as the negative electrode material, but graphite is in a metastable state after lithium intercalation, so the lithium-ion battery using it as the negative electrode will explode and catch fire after violent collision or acupuncture, causing safety accidents. At present, looking for other materials to replace graphite has become a research hotspot. Contents of the invention [0003] In order to overcome the shortcomings and deficiencies existing in the prior art, the obje...

Claims

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Application Information

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IPC IPC(8): H01M4/1397
CPCY02E60/10
Inventor 崔彦辉武俊伟屈德扬张新河李中延胡天麒郑新宇
Owner MCNAIR TECH