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Synthesis of an expanded graphite-tin oxide composite material and its application in lithium-ion batteries

A technology of lithium-ion batteries and expanded graphite, applied in graphene, battery electrodes, secondary batteries, etc., can solve the problems of electrode deactivation, poor cycle performance, electrode material and current collector falling off, etc., to increase specific capacity and increase The effect of cycle performance

Active Publication Date: 2021-10-22
余姚市海泰贸易有限公司
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  • Application Information

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Problems solved by technology

However, when metal tin is used as the negative electrode material of lithium-ion batteries, there are problems such as large irreversible capacity and poor cycle performance, mainly because the volume expansion of the material is serious during the alloying process. In the alloying of tin and lithium, the volume expansion reaches 300%. Left and right, the electrode material is prone to cracking and pulverization during the cycle, causing the electrode material and the current collector to fall off, resulting in the loss of activity of the electrode and serious capacity attenuation

Method used

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  • Synthesis of an expanded graphite-tin oxide composite material and its application in lithium-ion batteries
  • Synthesis of an expanded graphite-tin oxide composite material and its application in lithium-ion batteries
  • Synthesis of an expanded graphite-tin oxide composite material and its application in lithium-ion batteries

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Embodiment 1

[0029] (1) Low temperature oxidation of graphite

[0030] Add 60ml of sulfuric acid with a concentration of 95% and 20ml of nitric acid with a concentration of 60% into the three-necked flask, add 5g of graphite under stirring, keep stirring at 0°C for 30min, then slowly add 10g of potassium permanganate and keep it at 0°C Stir for a week in an ice-water bath. Then take it out, add distilled water, wash several times until the pH value of the filtrate reaches 6.0, and finally place the sample in a vacuum drying oven at 60°C to fully dry to obtain graphite oxide.

[0031] (2) Preparation of expanded graphite / tin oxide composites

[0032] The graphite oxide prepared in step (1) is mixed with SnCl4 5H2O in a mass ratio of 1:1, after adding 50mL of distilled water, then add ammonia (20%) to adjust the pH-10, then put the mixed solution into 100g of potassium permanganate and add Among them, the hydrothermal temperature is controlled at 180°C, taken out after the reaction is comp...

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Abstract

The invention discloses the synthesis of an expanded graphite-tin oxide composite material and its application in lithium-ion batteries. The invention uses graphite as a precursor, adopts a chemical oxidation method to prepare graphite oxide, and reacts with tin under hydrothermal conditions. An expanded graphite / tin oxide composite material was synthesized as the negative electrode material of lithium-ion batteries, and its application was used to prepare lithium-ion batteries, which have high specific capacity, good rate performance and superior cycle life.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to the synthesis of an expanded graphite-tin oxide composite material and its application in lithium ion batteries. Background technique [0002] In the past ten years, lithium-ion batteries have been widely used in portable devices and power batteries due to their superior electrochemical performance. With the demand for energy, the graphite anode materials commonly used in commercial lithium-ion batteries are far from being able to meet People's needs, the theoretical specific capacity of graphite is only 372mAh / g, and in practical applications, the capacity is only about 350mAh / g at low current density, which also limits the further development of the battery industry. It is also difficult for battery manufacturers to make breakthroughs in improving battery capacity by improving the preparation process. Therefore, the key factor restricting battery performance is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/48H01M4/38H01M10/0525C01B32/182
CPCH01M4/362H01M4/387H01M4/48H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 章雄峰刘超贾进前李小兵胡泽林文一波
Owner 余姚市海泰贸易有限公司
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