Method for preparing lithium ion battery anode/cathode material from reduced graphene oxide

A lithium-ion battery and positive electrode material technology, applied in the field of energy storage and conversion, can solve the problems of electrode structure damage, cycle stability deterioration, complex preparation process, etc., and achieve the effects of optimized conductivity, stable structure, and high quality

Inactive Publication Date: 2015-05-13
TIANJIN NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the agglomeration phenomenon existing in the cycle process of graphene negative electrode materials causes electrode structure damage, making its cycle stability worse; graphene composite negative electrode materials (Sn-based, Si-based, etc.) have a high specific capacity, but the preparation process is complex and costly. higher, which limits its practical application

Method used

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  • Method for preparing lithium ion battery anode/cathode material from reduced graphene oxide
  • Method for preparing lithium ion battery anode/cathode material from reduced graphene oxide
  • Method for preparing lithium ion battery anode/cathode material from reduced graphene oxide

Examples

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Effect test

Embodiment 1

[0057] The first example: (1) The first step is to improve the Hummers method to prepare graphite oxide: 1. Weigh 1g of graphite powder and 0.5g of NaNO 3 Mix evenly; 2. Under the condition of ice-water bath, add 5mL concentrated H 2 SO 4 Stir well, and slowly add 1.5g KMnO 4 Stir for 1 hour; 3. After stirring for 5 days at room temperature, add 50 mL of 5% H 2 SO 4 Stir for 1 hour; 4. Add an appropriate amount (about 3mL) of hydrogen peroxide (H 2 o 2 ) Stir until there are no bubbles in the solution; 5. Clean, use 10% HNO in a 4000mL beaker 3 Wash 2 times, then use 5% HNO 3 Wash twice; 6. Add deionized water and centrifugally wash to pH = 7, and dry the resulting solution at room temperature 25° C. to obtain graphite oxide.

[0058] The second example: (2) The first step is to improve the Hummers method to prepare graphite oxide: 1. Weigh 5g of graphite powder and 5g of NaNO respectively 3 Mix evenly; 2. Under the condition of ice-water bath, add 100mL concentrated H...

Embodiment 2

[0061] The first step is the same as the first example of embodiment 1: (1)

[0062] The second step, sodium citrate oil bath reflux method to reduce graphene oxide: 1. The prepared graphite oxide is fully ground to obtain a brownish-yellow powder (graphite oxide); 2. Weigh 200mg of graphite oxide powder and disperse it in 100mL of deionized water , after 30 minutes of ultrasonic peeling by an ultrasonic cell pulverizer to obtain a graphene oxide dispersion with a concentration of 2 mg / mL; 3. Centrifuge the above dispersion in a centrifuge at a speed of 10,000 rpm for 40 minutes to remove the centrifuged impurities; 4. Weigh 2g of sodium citrate and add it to the above-mentioned graphene oxide dispersion, and reflux the reaction in an oil bath at 80°C for 12 hours under vigorous stirring; 5. Extract and wash the above-mentioned reaction product with deionized water, and freeze the product After 12 hours, dry in a vacuum freeze dryer for 24 hours to obtain the reduced graphene ...

Embodiment 3

[0064] The first step is the same as the first example of embodiment 1: (2)

[0065]The second step is sodium borohydride reduction of graphene oxide: 1. The prepared graphite oxide is fully ground to obtain a brownish-yellow powder (graphite oxide); 2. Weigh 50 mg of graphite oxide powder and disperse it in 100 mL of deionized water. Ultrasonic peeling with a pulverizer for 15 minutes to obtain a graphene oxide dispersion with a concentration of 0.5 mg / mL; 3. Centrifuge the above dispersion in a centrifuge at a speed of 10,000 rpm for 20 minutes to remove the centrifuged impurities; 4. Weigh 0.1 Add 1 g of sodium borohydride to the above graphene oxide dispersion, and react at room temperature for 6 hours under vigorous stirring; 5. Extract and wash the above reaction product with deionized water, freeze the product for 12 hours and dry it in a vacuum freeze dryer for 24 hours The reduced graphene oxide (RGO) product is obtained.

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Abstract

The invention discloses a method for preparing a lithium ion battery anode / cathode material from reduced graphene oxide. The method comprises the following steps: performing ultrasonic dispersion on graphite oxide in an organic solvent, thereby obtaining a graphene oxide dispersion liquid; reducing by using an appropriate reducing agent or directly using a solvent, oxidizing graphene through oil bath backflow, a hydrothermal method or other reduction methods, thereby obtaining a reduced graphene oxide material containing part of oxygen-containing groups. When the prepared reduced graphene oxide material is used in a lithium ion battery anode material, a relatively high specific discharge capacity can be achieved, that is, is up to 280mAh / g, and good circulation stability and excellent rate performance are achieved. The prepared reduced graphene oxide material can be also used in a lithium ion battery cathode material, the specific discharge capacity can be kept being 900mAh / g and more than 900mAh / g after 100 rounds of charge / discharge circulation, and the circulation stability is relatively good. The method can be a significant study point of high-performance low-cost electrode materials of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of energy storage and conversion, and mainly relates to a method for preparing lithium-ion battery positive and negative electrode materials by using reduced graphene oxide. Background technique [0002] Lithium-ion battery is a new type of chemical power source developed in recent years. It is a hot spot for research and development all over the world. It has the characteristics of small size, light weight, high specific energy, no memory effect, and long cycle life. Widely used in mobile devices, electric vehicle energy and other fields. Among the various components of lithium-ion batteries, electrode materials are the core and key materials of lithium-ion batteries. The quality of electrode materials directly determines the specific energy, cycle life and load resistance of lithium-ion batteries and other key properties. Therefore, the development of high-performance lithium-ion batteries and their elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0525C01B31/04
CPCC01B32/184H01M4/133H01M4/1393H01M4/587H01M10/0525H01M2004/027H01M2004/028C01B32/192C01B32/23Y02E60/10
Inventor 李喜飞李德军熊东彬鄯慧董立天
Owner TIANJIN NORMAL UNIVERSITY
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