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Preparation method of carbon-cladding graphite oxide/Sn composite cathode material of lithium ion battery

A sodium-ion battery and negative electrode material technology, which is applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve problems such as poor cycle performance and reduced mechanical stability, and achieve abundant resources, increased capacity, and reduced energy consumption. The effect of specific surface area

Active Publication Date: 2015-07-08
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Komaba et al [Komaba S, Matsuura Y, Ishikawa T, et al. Redox reaction of Sn-polyacrylate electrodes in aprotic Na cell[J]. Electrochemistry Communications, 2012, 21: 65-68.] studied the use of Sn as a sodium ion battery The sodium intercalation performance of the negative electrode, the reversible capacity exceeds 500mAh / g, but the cycle performance is not good
Although the sodium storage capacity of the metal element material is much larger than that of the carbon base, the crystal symmetry and unit cell volume of the metal element material will change greatly during the intercalation / extraction process of sodium ions, the mechanical stability will decrease, and the dramatic volume Swelling and pulverization are the key reasons for its rapid capacity decay and poor cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment proceeds according to the following steps:

[0031] (1) Using natural flake graphite as raw material, prepare graphite oxide by Hummers method: add natural flake graphite to concentrated sulfuric acid pre-cooled to 0 °C under stirring, then add the mixture of ammonium nitrate and potassium permanganate, and in Keep the temperature at 0-1°C under stirring condition. After reacting for 2 hours, transfer it to a constant temperature water bath at 35°C, keep it warm for 30 minutes under stirring condition, then slowly add distilled water to raise the temperature to 98°C, maintain at this temperature for 15 minutes, and then Add warm water for further dilution, add hydrogen peroxide solution and filter at this temperature, fully wash the filter cake with HCl, and dry it in vacuum at 50°C for 48h;

[0032] Add the tin-containing organic compound tetraethyltin to the prepared graphite oxide, the mass ratio of tetraethyltin and graphite oxide is 0.5:1, and c...

Embodiment 2

[0038] This embodiment proceeds according to the following steps:

[0039] (1) Using natural flake graphite as raw material, prepare graphite oxide by Hummers method: add natural flake graphite to concentrated sulfuric acid pre-cooled to 0 °C under stirring, then add the mixture of ammonium nitrate and potassium permanganate, and in Keep the temperature at 0-1°C under stirring condition. After reacting for 2 hours, transfer it to a constant temperature water bath at 35°C, keep it warm for 30 minutes under stirring condition, then slowly add distilled water to raise the temperature to 98°C, maintain at this temperature for 15 minutes, and then Add warm water for further dilution, add hydrogen peroxide solution and filter at this temperature, fully wash the filter cake with HCl, and dry it in vacuum at 50°C for 48h;

[0040] Add tin-containing organic compound dibutyltin dilaurate to the prepared graphite oxide, the mass ratio of dibutyltin dilaurate and graphite oxide is 0.7:1,...

Embodiment 3

[0046] This embodiment proceeds according to the following steps:

[0047] (1) Using natural flake graphite as raw material, prepare graphite oxide by Hummers method: add natural flake graphite to concentrated sulfuric acid pre-cooled to 0 °C under stirring, then add the mixture of ammonium nitrate and potassium permanganate, and in Keep the temperature at 0-1°C under stirring condition. After reacting for 2 hours, transfer it to a constant temperature water bath at 35°C, keep it warm for 30 minutes under stirring condition, then slowly add distilled water to raise the temperature to 98°C, maintain at this temperature for 15 minutes, and then Add warm water for further dilution, add hydrogen peroxide solution and filter at this temperature, fully wash the filter cake with HCl, and dry it in vacuum at 50°C for 48h;

[0048] Add tin-containing organic compound dibutyltin diacetate to the prepared graphite oxide, the mass ratio of dibutyltin diacetate and graphite oxide is 0.5:1,...

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Abstract

The invention belongs to the technical field of new energy, and particularly relates to a preparation method of a carbon-cladding graphite oxide / Sn composite cathode material of a lithium ion battery. The method comprising the following steps of preparing graphite oxide by adopting natural crystalline flake graphite as a raw material and adopting a Hummers method, placing a tin-containing organic compound into the prepared graphite oxide to obtain a graphite oxide / Sn composite, carrying out the organic cladding by adopting a liquid-phase cladding method, carrying out the high-temperature calcining, and obtaining the carbon-cladding graphite oxide / Sn composite sodium ion battery cathode material. The prepared electrode material is large in reversible capacity, small in size variation, good in cycling property and high in primary charging-discharging efficiency.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a method for preparing a carbon-coated graphite oxide / Sn composite negative electrode material of a sodium ion battery. Background technique [0002] Fossil fuels have always been the main source of energy. However, with the depletion of non-renewable fossil fuels, energy problems are becoming more and more prominent. Vigorously developing new energy and realizing sustainable development is the fundamental way to solve this problem. New energy sources include solar energy, hydropower, wind power, biomass energy, wave energy, tidal energy, ocean temperature difference energy, etc. However, most new energy sources are intermittent and random, making it difficult to use them effectively. The development of efficient and convenient energy storage technology is very important for changing the energy structure and developing new energy. Lithium-ion battery is a very s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62
CPCH01M4/362H01M4/364H01M4/366H01M4/387H01M4/587H01M4/62H01M4/625H01M10/054Y02E60/10
Inventor 杨绍斌董伟沈丁王晓亮李思南徐建博孙闻张琴
Owner LIAONING TECHNICAL UNIVERSITY
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