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Lithium ion battery cathode active material, preparation method of the lithium ion battery cathode active material, cathode material and cathode

A negative electrode active material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of flake nanostructures being easily damaged and affecting battery life.

Active Publication Date: 2012-11-21
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  • Abstract
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  • Application Information

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Problems solved by technology

Tae-Joon Kim et al. (Journal of Power Sources, 2007, 167, 529-535) prepared tin sulfide nanosheets for lithium-ion battery negative electrode active materials by hydrothermal method; Jung-wook Seo et al. (Adv.Mater.2008, 20, 4269-4273) using Sn(S 2 CNEt 2 ) 4 Obtaining tin sulfide nano-sheets is used as negative electrode active material for lithium-ion batteries; CN101844799A discloses a method of using carbon disulfide as a sulfur source and using anisole as a reaction solvent to prepare hexagonal tin sulfide nano-sheets by chemical solution method; but these The flake nanostructures prepared by the method are easily damaged during battery charging and discharging, which affects battery life

Method used

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  • Lithium ion battery cathode active material, preparation method of the lithium ion battery cathode active material, cathode material and cathode
  • Lithium ion battery cathode active material, preparation method of the lithium ion battery cathode active material, cathode material and cathode
  • Lithium ion battery cathode active material, preparation method of the lithium ion battery cathode active material, cathode material and cathode

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preparation example Construction

[0019] The present invention also provides a preparation method of lithium ion battery negative electrode active material, wherein, the method comprises the following steps:

[0020] (1) Under the condition that the temperature is 15-50°C, 1 mass part of flake graphite, 0.5-0.8 mass parts of sodium nitrate, 3-6 mass parts of potassium permanganate and 50-100 mass parts of 98% by weight of concentrated sulfuric acid After carrying out the contact reaction for 75-150 hours, the solid was separated;

[0021] (2) placing the obtained solid in an organic solvent for ultrasonic dispersion to obtain a dispersion;

[0022] (3) Based on 1 part by mass of solid dispersed in an organic solvent, add 1-100 parts by mass of soluble tin salt and 1-1000 parts by mass of water to the dispersion, and continue the reaction at a temperature of 120-180°C After 3-8 hours, filter to obtain a solid; and react the solid in a mixed gas atmosphere of hydrogen sulfide and inert gas at 300-600°C for 2-10...

Embodiment 1

[0050] This example is used to illustrate the preparation of the lithium ion battery negative electrode active material.

[0051] (1) Preparation of graphene oxide sheet: 1g flake graphite (particle size is 1 micron), 0.5g sodium nitrate and 5g potassium permanganate are added in 100g vitriol oil (concentration is 98% by weight), stirring at room temperature After 150 hours, it was filtered, washed with deionized water, and vacuum-dried at 60° C. for 12 hours to obtain graphene oxide sheets.

[0052] (2) Preparation of lithium-ion battery negative electrode active material: the graphene oxide sheet of 0.1g obtained in step (1) is ultrasonically dispersed in 100ml ethylene glycol (Beijing Chemical Plant, analytically pure), then add 1g of chlorine dihydrate Sn (Sinopharm Group Chemical Reagent Co., Ltd.) and 10ml of deionized water, the resulting reactant was refluxed and stirred at 120°C for 8h, and was repeatedly centrifuged and washed with ethanol solvent for 5 times, then v...

Embodiment 2

[0055] This example is used to illustrate the preparation of the lithium ion battery negative electrode active material.

[0056] (1) Preparation of graphene oxide: adopt the same method as step (1) of embodiment 1 to carry out, the difference is that the particle diameter of flake graphite is 100 microns, the addition of potassium permanganate is 3g, the addition of vitriol oil The amount was 50 g, and the stirring time at room temperature was 75 hours to obtain graphene oxide sheets.

[0057] (2) Preparation of lithium-ion battery negative electrode active material: Ultrasonic dispersion of 0.1g of graphene oxide sheets obtained in step (1) in 100ml ethylene glycol (Beijing Chemical Plant, analytically pure), then add 0.1g of tetrachloride Chloride tin (Sinopharm Group Chemical Reagent Co., Ltd.) and 0.1ml deionized water, the resulting reactant was refluxed and stirred at 140°C for 6h, and was repeatedly centrifuged and washed with ethanol solvent for 5 times, then vacuum-d...

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Abstract

The invention provides a lithium ion battery cathode active material. The lithium ion battery cathode active material is characterized in that the lithium ion battery cathode active material comprises tin sulfide nano-sheets and graphene nano-sheets; the thickness of the graphene nano-sheet is in a range of 1 to 20nm; the thickness of the tin sulfide nano-sheet is in a range of 5 to 50nm; and the lithium ion battery cathode active material has a porous structure. The invention also provides a preparation method of the lithium ion battery cathode active material, a cathode material containing the lithium ion battery cathode active material, and a cathode prepared from the cathode material. The lithium ion battery cathode active material has a high reversible capacity, good fast charging-discharging cycling stability and a low cost.

Description

technical field [0001] The invention relates to a negative pole active material of a lithium ion battery, a preparation method thereof, a negative pole material and a negative pole. Background technique [0002] Tin sulfide is a very potential negative electrode active material for lithium-ion batteries, with a theoretical capacity of 645mAh / g. However, tin-based electrode materials will produce large volume changes during charging and discharging lithium-ion intercalation, resulting in battery cycles. The performance deteriorates and the service life is very low. At present, there are two main ways to solve this problem: one is to nanoscale the structure and size of the active material, such as preparing nanoparticles, nanowires or nanosheets, which can not only slow down the volume effect, but also facilitate ion diffusion and transport. The second is to optimize the structure and composition of electrode materials by introducing active or inactive substances. When nano-a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/1397H01M4/62H01M4/136
CPCY02E60/122Y02E60/10
Inventor 智林杰罗彬梁明会方岩王斌
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