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Preparation method of lithium ion battery cathode material

A kind of technology of lithium ion battery and negative electrode material

Inactive Publication Date: 2015-05-27
MCNAIR TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the specific capacity, rate performance and cycle performance of the composite materials containing tin dioxide in the prior art are still difficult to meet the actual needs

Method used

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  • Preparation method of lithium ion battery cathode material
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  • Preparation method of lithium ion battery cathode material

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Embodiment 1

[0040] The preparation method of a kind of negative electrode material of lithium-ion battery provided by this embodiment comprises the following steps:

[0041] The first step is to disperse 40 mg of graphene oxide into 80 mL of deionized water by means of ultrasonic dispersion, then add 0.6 mL of hydrochloric acid with a mass concentration of 36%, and stir and mix evenly to obtain solution A;

[0042] In the second step, 1.2g tin protochloride (with two waters of crystallization, relative molecular weight is 225.65) is added in solution A, and tin protochloride is completely dissolved, obtains solution B;

[0043] In the third step, the solution B is placed in an environment with a temperature of 60°C and reacted for 6 hours with magnetic stirring, and then centrifuged at a speed of 5000r / min to obtain the reaction product, and the reaction product is washed, specifically, with deionized water for 3 time, and then washed 3 times with absolute ethanol to obtain a graphene-tin...

Embodiment 2

[0051] The preparation method of a kind of negative electrode material of lithium-ion battery provided by this embodiment comprises the following steps:

[0052] In the first step, 120 mg of graphene oxide was dispersed into 80 mL of deionized water by means of ultrasonic dispersion, and then 1.0 mL of hydrochloric acid with a mass concentration of 36% was added, and after mixing evenly by magnetic stirring, solution A was obtained;

[0053] In the second step, 3g tin protochloride (with two waters of crystallization, relative molecular weight is 225.65) is added in solution A, and tin protochloride is dissolved completely, obtains solution B;

[0054] In the third step, the solution B is placed in an environment with a temperature of 70°C and reacted for 10 hours while magnetically stirring, and then centrifuged at a speed of 4000r / min to obtain the reaction product, and the reaction product is washed, specifically, washed with deionized water for 2 time, and then washed 3 ti...

Embodiment 3

[0058] The preparation method of a kind of negative electrode material of lithium-ion battery provided by this embodiment comprises the following steps:

[0059] In the first step, 200 mg of graphene oxide was dispersed into 80 mL of deionized water by means of ultrasonic dispersion, and then 2.0 mL of hydrochloric acid with a mass concentration of 36% was added, and the solution A was obtained after mechanical stirring and mixing;

[0060] In the second step, 5g tin protochloride (with two waters of crystallization, relative molecular weight is 225.65) is added in solution A, and tin protochloride is dissolved completely, obtains solution B;

[0061] In the third step, the solution B is placed in an environment with a temperature of 60°C and reacted for 5 hours while being mechanically stirred, and then centrifuged at a speed of 4000r / min to obtain the reaction product, and the reaction product is washed, specifically, washed with deionized water for 2 time, and then washed 2...

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a preparation method of a lithium ion battery cathode material. The preparation method comprises the following steps: dispersing graphene oxide in deionized water, and then adding hydrochloric acid to uniformly mix; adding stannous chloride and reacting to obtain a graphene-stannic dioxide composite material, then dispersing the composite material in the deionized water, then adding a water soluble macromolecular matter, then converting to a reaction kettle to react, and separating to obtain a reaction product; washing, drying and calcining the reaction product to obtain the graphene-stannic dioxide-carbon nanosheet composite material. Compared with the prior art, SnO2 particles in the composite material prepared by using a hydrothermal carbon coating method are relatively small, and moreover, the structure can alleviate volume expansion of SnO2 and reduce the diffusing distance of lithium ions in the material, so that the lithium storage specific capacity of the material is improved and permeation of the electrolyte is facilitated, and therefore, the electronic conductivity of the material is improved and the rate capability of the material is further improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium ion battery negative electrode material. Background technique [0002] The development of the new energy automobile industry has brought unprecedented opportunities and markets to lithium-ion batteries, but commercialized graphite materials have low capacity, high selectivity to electrolytes, poor high-current charge and discharge performance, and are prone to lithium branches. However, problems such as easy collapse of crystals and interlayers have made it difficult to meet people's needs for higher capacity and higher safety of lithium-ion anode materials. Therefore, it is urgent to develop new lithium-ion battery anode materials with high capacity and excellent cycle stability. [0003] Tin-based oxides are mainly SnO 2 and SnO, among which tin dioxide (SnO 2 ) due to its high theoretical capacity (782mAh·g -1 ) a...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M4/48B82Y30/00
CPCB82Y30/00H01M4/139H01M4/1393H01M4/362H01M4/483H01M4/583Y02E60/10
Inventor 周训富宋晓娜屈德扬张新河张志勇黄象金邓耀明李中延郑新宇
Owner MCNAIR TECH
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