Preparation method of spherical hollow lithium titanate/graphene composite material as lithium battery negative material
A technology of empty lithium titanate and graphene, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of decreased specific capacity, low ionic conductivity, low conductivity of lithium titanate, etc., to improve electrical conductivity, The effect of improving specific capacity and low preparation cost
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[0028] Example 1:
[0029] 1. In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following describes the present invention in detail with reference to embodiments.
[0030] Example 1
[0031] (1) Preparation of silica balls:
[0032] Dissolve 1.6 mL of ethyl orthosilicate (TEOS) in 44 mL of absolute ethanol to form solution A; dissolve 10 mL of ammonia in 44 mL of absolute ethanol to form solution B; mix 2 mL of ethyl orthosilicate Dissolve in 88 mL of absolute ethanol to form C solution.
[0033] Add the A solution and the B solution into the three-necked flask and start stirring at the same time. After the reaction for 30 minutes, add 8 mL of ammonia to the three-necked flask. After the reaction for 5-10 minutes, add the C solution to the system and continue the reaction. 2 h. Repeated centrifugation and washing with water to obtain a solid phase, namely silica balls.
[0034] (2) Preparation of silicon dioxide and titanium diox...
Example Embodiment
[0041] Example 2
[0042] (1) Preparation of silica balls:
[0043] Dissolve 1.6 mL of ethyl orthosilicate (TEOS) in 44 mL of absolute ethanol to form solution A; dissolve 10 mL of ammonia in 44 mL of absolute ethanol to form solution B; mix 2 mL of ethyl orthosilicate Dissolve in 88 mL of absolute ethanol to form C solution.
[0044] Add the A solution and the B solution into the three-necked flask and start stirring at the same time. After the reaction for 30 minutes, add 8 mL of ammonia to the three-necked flask. After the reaction for 5-10 minutes, add the C solution to the system and continue the reaction. 2 h. Repeated centrifugation and washing with water to obtain a solid phase, namely silica balls.
[0045] (2) Preparation of silicon dioxide and titanium dioxide:
[0046] Mix 0.1 g of hydroxypropyl cellulose, 60 mL of absolute ethanol and 0.6 mL of deionized water to form a mixed solution.
[0047] Disperse 0.2 g of silica balls in the mixed solution ultrasonically, add 1 g...
Example Embodiment
[0052] Example 3
[0053] (1) Preparation of silica balls:
[0054] Dissolve 1.6 mL of ethyl orthosilicate (TEOS) in 44 mL of absolute ethanol to form solution A; dissolve 10 mL of ammonia in 44 mL of absolute ethanol to form solution B; mix 2 mL of ethyl orthosilicate Dissolve in 88 mL of absolute ethanol to form C solution.
[0055] Add the A solution and the B solution into the three-necked flask and start stirring at the same time. After the reaction for 30 minutes, add 8 mL of ammonia to the three-necked flask. After the reaction for 5-10 minutes, add the C solution to the system and continue the reaction. 2 h. Repeated centrifugation and washing with water to obtain a solid phase, namely silica balls.
[0056] (2) Preparation of silicon dioxide and titanium dioxide:
[0057] Mix 0.1 g of hydroxypropyl cellulose, 60 mL of absolute ethanol and 0.6 mL of deionized water to form a mixed solution.
[0058] Disperse 0.2 g of silica balls in the mixed solution ultrasonically, add 2 g...
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