Graphene/nano-silicon intercalation composite with surface coupling activity and its preparation and application
A technology of composite materials and graphene, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problems of reducing the cost of scale production, shedding of active substances, shortening the preparation time, etc., to improve the durability ability, promotion of chemical bonding and adhesion, and prolongation of cycle life and capacity retention
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Embodiment 1
[0038] (1) Preparation of graphene / nano-silicon intercalation composites
[0039] With 0.1g nano silicon powder, 0.1g graphite powder, 1g (NH 4 ) 2 S 2 o 8 , 4ml 98% concentrated sulfuric acid, and 4ml oleum were stirred evenly by ultrasonic stirring, and magnetic stirring was continued for 4 hours at room temperature. After the reaction, the reaction solution was filtered, the solid was washed with deionized water until the filtrate was neutral, and freeze-dried for 24 hours to obtain a graphene / nano-silicon intercalation composite material.
[0040] (2) Surface coupling treatment
[0041] According to the type of adhesive to be selected in the subsequent pole piece production process, select the corresponding silane coupling agent with high compatibility. The silane coupling agent vinyltriethoxysilane (A-151) was hydrolyzed in the acetic acid solution of pH=5.5 for 0.5h to obtain the corresponding silanol, and then the silanol obtained by hydrolysis was immediately comb...
Embodiment 2
[0046] (1) Preparation of graphene / nano-silicon intercalation composites
[0047] With 0.3g nano silicon powder, 0.7g graphite powder, 7g (NH 4 ) 2 S 2 o 8 , 28ml of 98% concentrated sulfuric acid, and 28ml of fuming sulfuric acid were stirred evenly by ultrasonic stirring, and magnetic stirring was continued at room temperature for 3h. After the reaction, the mixed reaction solution was filtered, the solid was washed with deionized water until the filtrate was neutral, and freeze-dried for 24 hours to obtain a graphene nano / silicon intercalation composite material.
[0048] (2) Surface coupling treatment
[0049] According to the type of adhesive to be selected in the subsequent pole piece production process, select the corresponding silane coupling agent with high compatibility. The silane coupling agent is hydrolyzed in the acetic acid solution of pH=5.5 for 0.5h to obtain the silanol corresponding to the silane coupling agent, and then immediately combine the silanol ...
Embodiment 3
[0061] (1) Preparation of graphene / nano-silicon intercalation composites
[0062] With 0.1g nano silicon powder, 0.9g graphite powder, 9g (NH 4 ) 2 S 2 o 8 , 36ml of 98% concentrated sulfuric acid, and 36ml of oleum were stirred evenly by ultrasonic stirring, and magnetic stirring was continued at room temperature for 3-4h. After the reaction, dilute the reaction liquid and filter it, wash the solid with deionized water until the filtrate is neutral, and freeze-dry for 24 hours to obtain a graphene / nano-silicon intercalation composite material.
[0063] (2) Surface coupling treatment
[0064] According to the type of adhesive to be selected in the subsequent pole piece production process, select the corresponding silane coupling agent with high compatibility. The silane coupling agent undergoes a hydrolysis reaction in an acetic acid solution with pH=5.5 for 0.5 h to obtain the silanol corresponding to the silane coupling agent. Immediately thereafter it was mixed with t...
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