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Preparation method of SnO2/graphene lithium ion battery negative electrode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., to achieve the effect of improving electrochemical performance, excellent cycle performance, and not easy to fall off

Inactive Publication Date: 2019-05-14
SHENZHEN GPC ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of this invention is to provide a kind of SnO 2 / Preparation method of graphene lithium ion battery anode material to solve SnO 2 The volume effect of negative electrode materials and the agglomeration of nanoparticles can improve its cycle stability

Method used

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  • Preparation method of SnO2/graphene lithium ion battery negative electrode material
  • Preparation method of SnO2/graphene lithium ion battery negative electrode material

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Effect test

Embodiment 1～3

[0029] A kind of SnO 2 / Graphene lithium ion battery anode material and preparation method thereof, including the following steps:

[0030] Step (1) Preparation of graphene oxide (or graphene) colloid

[0031] The classical Hummers method prepares graphene oxide colloid: will contain 23mL concentrated H 2 SO 4 The three-necked flask is fixed in an ice water bath (below 4℃), weigh 1g of natural flake graphite and add it to the flask, stir for 10min, then add 0.5g NaNO in batches 3 And 3gKMnO 4 , Keep stirring for 2h. After the low temperature oxidation is over, the temperature is raised to 35-40°C for 30 minutes of medium temperature oxidation. After the medium temperature oxidation is completed, 46 mL of deionized water is added, and the temperature is raised to 98°C for 30 minutes of high temperature oxidation. After the high temperature oxidation is over, add 140mL of deionized water and 5mL of H 2 O 2 (30 vol%) The reaction was terminated, filtered while hot, and the product was...

Embodiment 4～7

[0039] A kind of SnO 2 / Graphene lithium ion battery anode material and preparation method thereof, including the following steps:

[0040] Step (1) Preparation of graphene oxide colloid: the classical Hummers method is used to prepare graphene oxide colloid;

[0041] Step (2) Preparation of graphene oxide / Sn(OH) 4 Precursor: Measure different amounts of graphene colloids, add them to 50mL of deionized water, disperse for 60min by high-power ultrasound (ultrasonic power greater than 300W), and then add 4.7g of SnCl to the dispersion 4 ·5H 2 O, keep stirring to dissolve, slowly add 3.4gCO(NH 2 ) 2 , The temperature was raised to 90℃, and the reaction was stirred for 4h to obtain graphene oxide / Sn(OH) 4 The mixed solution is then filtered by suction, washed repeatedly until there is no chloride ion, and dried in vacuum to obtain graphene oxide / Sn(OH) 4 Solid powder

[0042] Step (3) High temperature synthesis of SnO 2 / Graphene lithium ion battery anode material: under argon atmospher...

Embodiment 8～12

[0047] A kind of SnO 2 / Graphene lithium ion battery anode material and preparation method thereof, including the following steps:

[0048] Step (1) Preparation of graphene oxide colloid: the classical Hummers method is used to prepare graphene oxide colloid;

[0049] Step (2) Preparation of graphene oxide / Sn(OH) 4 Precursor: Measure 20mL of graphene colloid, add it to 50mL of deionized water, disperse for 90min by high-power ultrasound (ultrasonic power is greater than 300W), then add different amounts of tin salt to the dispersion, continue to stir to dissolve, until the dissolution is complete Then slowly add an appropriate amount of precipitant, start to heat up to 90°C, stir and react for 4h to obtain graphene oxide / Sn(OH) 4 The mixed solution is then filtered by suction, washed repeatedly until there is no chloride ion, and dried in vacuum to obtain graphene oxide / Sn(OH) 4 Solid powder

[0050] Step (3) High temperature synthesis of SnO 2 / Graphene lithium ion battery anode m...

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Abstract

The invention discloses a preparation method of a SnO2 / graphene lithium ion battery negative electrode material. The preparation method comprises the following steps of (1) preparation of graphene oxide (or graphene) colloid; (2) synthesis of graphene oxide / Sn(OH)4 (or graphene / Sn(OH)4) precursor powder; and (3) performing high-temperature calcining on the graphene oxide / Sn(OH)4 powder in an inertgas atmosphere to obtain the SnO2 / graphene lithium ion battery negative electrode material. The prepared SnO2 / graphene lithium ion battery negative electrode material has a dot matrix structure, andthe problem of the volume effect of the SnO2 negative electrode material and the agglomeration problem of the nanoparticles are solved, and SnO2 nanoparticles are uniformly distributed on a graphene sheet, so that high electrochemical performance is achieved.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular to a SnO 2 / Graphene lithium ion battery anode material preparation method. Background technique [0002] In recent years, lithium-ion batteries have been widely used in aerospace, electric vehicles and electronic products due to their advantages of light weight, low pollution, high working voltage, high energy density, and long cycle life. The current commercial lithium Ion batteries mainly use graphite or modified graphite as the negative electrode material. Its advantages are good cycle performance and rate performance, but its theoretical specific capacity is only 372mAh / g, which is difficult to use in high-end electronic products, electric vehicles and other high energy density requirements widely used. [0003] Tin dioxide (SnO 2 ) Is regarded as one of the most promising new lithium-ion battery anode materials, with high specific capacity (theoretical specific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 李胜杨艳飞李国敏
Owner SHENZHEN GPC ENERGY GRP CO LTD
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