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Synthesis of expanded graphite-tin oxide composite material and application of expanded graphite-tin oxide composite material in lithium ion battery

A lithium-ion battery and expanded graphite technology, which is applied in graphene, battery electrodes, secondary batteries, etc., can solve the problems of electrode deactivation, poor cycle performance, and large initial irreversible capacity, so as to improve specific capacity and cycle performance Effect

Active Publication Date: 2018-04-13
桑顿新能源科技(长沙)有限公司
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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 expanded graphite-tin oxide composite material and application of expanded graphite-tin oxide composite material in lithium ion battery
  • Synthesis of expanded graphite-tin oxide composite material and application of expanded graphite-tin oxide composite material in lithium ion battery
  • Synthesis of expanded graphite-tin oxide composite material and application of expanded graphite-tin oxide composite material in lithium ion battery

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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 into it, and keep it at 0°C Stir in an ice-water bath for one week. 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 SnCl 4 ·5H 2 Mixed by mass ratio of 1:1, after adding 50mL distilled water, then adding ammonia water (20%) to adjust pH-10, then putting the mixed solution into 100g potassium permanganate and adding it, and keeping it at 0 ° C, the hydrothermal temperature control At 180°C, ...

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Abstract

The invention discloses synthesis of an expanded graphite-tin oxide composite material and application of the expanded graphite-tin oxide composite material in a lithium ion battery. Graphite oxide isprepared by taking graphite as a precursor and by employing a chemical oxidization method, and the expanded graphite / tin oxide composite material is synthesized by reaction of the graphite oxide andtin under a hydrothermal condition and is used as a lithium ion battery negative electrode material. The expanded graphite-tin oxide composite material is used for preparing a lithium ion battery, hasrelatively high specific capacity and simultaneously has relatively good rate performance and excellent cycle lifetime.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular 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 by human beings, the commonly used graphite anode materials for commercial lithium-ion batteries are far from being able to meet. According to 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 the...

Claims

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Application Information

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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 桑顿新能源科技(长沙)有限公司
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