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Preparation method of graphene-modified tin oxide lithium ion battery negative material

A lithium-ion battery and tin dioxide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as high operating environment requirements, difficult waste liquid treatment, and complex equipment, and achieve convenient operation, abundant raw materials, and distributed even tight effect

Inactive Publication Date: 2014-12-17
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acidic or alkaline systems will inevitably lead to disadvantages such as high operating environment requirements, complicated equipment, difficult waste liquid treatment, and easy to cause secondary pollution.

Method used

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  • Preparation method of graphene-modified tin oxide lithium ion battery negative material
  • Preparation method of graphene-modified tin oxide lithium ion battery negative material
  • Preparation method of graphene-modified tin oxide lithium ion battery negative material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of a graphene-modified tin dioxide lithium-ion battery negative electrode material, comprising the steps of:

[0029] (1) Accurately weigh 1.0000g of metal tin and dissolve it in 20ml of dilute nitric acid with a concentration of 4M under ice bath and stirring conditions, and add 34ml of citric acid with a concentration of 0.5M under continuous stirring conditions to make divalent tin The molar ratio of ions to citric acid is 1:2, then adjust the pH of the solution to 7 with 20wt% ammonia water, and finally dilute it to 200 ml with deionized water to obtain a light yellow transparent Sn(OH) with a concentration of 0.042M 2 positive sol;

[0030] (2) Accurately weigh 0.1000g of graphene oxide with 150W ultrasound for 30min and disperse it in 500mL of water to obtain a graphene oxide negative sol with a pH of 7 and a concentration of 0.2mg / mL;

[0031] (3) Under stirring conditions, the Sn(OH) 2 The positive sol was dripped into the graphene oxide n...

Embodiment 2

[0035] A preparation method of a graphene-modified tin dioxide lithium-ion battery negative electrode material, comprising the steps of:

[0036] (1) Accurately weigh 1.0000g of metal tin and dissolve it in 20ml of dilute nitric acid with a concentration of 4M under ice bath and stirring conditions, and add 34ml of citric acid with a concentration of 0.5M under continuous stirring conditions to make divalent tin The molar ratio of ions to citric acid is 1:2, then adjust the pH of the solution to 7 with 20wt% ammonia water, and finally dilute to 200 ml with deionized water to obtain a concentration of 0.042M light yellow transparent Sn(OH) 2 positive sol;

[0037] (2) Accurately weigh 0.3000g of graphene oxide with 100W ultrasound for 60min and disperse it in 500mL of water to obtain a graphene oxide negative sol with a pH of 7 and a concentration of 0.6mg / mL;

[0038] (3) Under stirring conditions, the Sn(OH) 2 The positive sol was slowly dripped into the graphene oxide nega...

Embodiment 3

[0042] A preparation method of a graphene-modified tin dioxide lithium-ion battery negative electrode material, comprising the steps of:

[0043] (1) Accurately weigh 3.0000g of metal tin and dissolve it in 20ml of dilute nitric acid with a concentration of 4M under ice bath and stirring conditions, add 50ml of citric acid with a concentration of 1M under continuous stirring to make divalent tin ions and lemon The molar ratio of the acid is 1:2, then the pH of the solution is adjusted to 7 with 25wt% ammonia water, and finally diluted to 200 ml with deionized water, the available concentration is 0.126M light yellow transparent Sn(OH) 2 positive sol;

[0044] (2) Accurately weigh 0.1000g of graphene oxide with 100W ultrasound for 40min and disperse it in 500mL of water to obtain a graphene oxide negative sol with a pH of 7 and a concentration of 0.2mg / mL;

[0045] (3) Under stirring conditions, the Sn(OH) 2 The positive sol was dropped into the graphene oxide negative sol at...

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Abstract

The invention discloses a method for preparing a graphene-modified tin oxide lithium ion battery negative material by adopting a sol in-situ electrostatic copolymerization sedimentation method, and belongs to the technical fields of material science and secondary power sources. The preparation process comprises the steps of dropwise feeding prepared Sn(OH)2 sol with positive surface charges into graphene oxide sol with negative surface charges, and enabling the two kinds of sol to be subjected to in-situ electrostatic copolymerization sedimentation under the action of electrostatic force to generate black flocculated precipitate; and centrifuging, washing, drying the precipitate, and then reducing by calcining the dried precipitate at the temperature of 400-600 DEG C under a nitrogen atmosphere to obtain the graphene-modified tin oxide lithium ion battery negative material. According to the method, the reaction process is carried out in a neutral water solution, other reagents are not needed, the precipitation reaction is fully carried out, the phenomenon is obvious, and the separating and the washing are easily carried out; the prepared lithium ion battery negative material has the excellent electrochemical capacity performance, cycle performance and rate capability, and has the very wide market application prospect in the lithium ion battery industry.

Description

technical field [0001] The invention belongs to the technical field of material science and secondary power supply, in particular to a preparation method of a graphene-modified tin dioxide lithium ion battery negative electrode active material. Background technique [0002] At present, lithium-ion batteries occupy an absolute dominant position in various portable electronic devices and are regarded as the most commercially promising power substitutes for the next generation of popular electric / hybrid vehicles. In order to store and transport electric energy more efficiently, researchers have been devoting themselves to exploring various high-energy anode materials for next-generation rechargeable lithium-ion batteries, such as tin dioxide (SnO2) with theoretical specific capacities as high as 782, 926 and 673 mAh / g, respectively. 2 ), ferric oxide (Fe 2 o 3 ), copper oxide (CuO), etc. However, due to the poor conductivity of these materials, it is not conducive to the cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/362H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 王艳坤张建民刘玉山
Owner ZHENGZHOU UNIV
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