A kind of negative electrode material of lithium ion battery and prepared negative electrode of lithium ion battery
A lithium-ion battery and negative electrode material technology, applied in the field of lithium-ion batteries, can solve the problems of easy generation of lithium dendrites, low battery energy density, short cycle life, etc., to reduce production costs, avoid battery loss, and super long cycle life Effect
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Embodiment 1
[0021] Preparation of active material: 10 g of tannic acid was completely dissolved in 200 ml of pure water under normal pressure stirring. 3.18 g FeCl 3 ·6H 2 O was dissolved in 50 ml of pure water to obtain a ferric ion aqueous solution with a concentration of 0.2 mol / L, which was added dropwise to the tannic acid aqueous solution within 10 minutes, and the solution changed from light yellow to dark black. After stirring at room temperature for 1 hour, the pH value of the solution was adjusted to 8.0 with 1 mol / L aqueous sodium hydroxide solution, and a large amount of black powder precipitated. A black powder was isolated by centrifugation at 8000 rpm for 5 min. The black powder was washed three times with pure water and ethanol respectively, and 7.8 g of active material was obtained after drying.
[0022] Preparation of lithium ion battery negative electrode: Mix 3 grams of active material and 1.5 grams of conductive carbon black evenly, then add 10 grams of polyacrylic...
Embodiment 2
[0025] Preparation of active material: 15 g of tannic acid was completely dissolved in 300 ml of pure water under normal pressure stirring. 8.12 g FeCl 3 ·6H 2 After O is dissolved in 100 ml of pure water, remember that the ferric ion aqueous solution with a concentration of 0.3mol / L is added dropwise to the tannic acid aqueous solution within 10 minutes, and the solution changes from light yellow to dark black. After continuous stirring at room temperature for 1.5 hours, the pH value of the solution was adjusted to 7.5 with 0.5 mol / L aqueous sodium hydroxide solution, and a large amount of black powder precipitated. A black powder was isolated by centrifugation at 7500 rpm for 10 min. The black powder was washed three times with pure water and ethanol respectively, and 11.5 g of active material was obtained after drying.
[0026] The preparation of lithium-ion battery negative electrode: the active material of 4.9 grams, the conductive graphite of 1.4 grams and the graphen...
Embodiment 3
[0029] Preparation of active material: 20 g of tannic acid was completely dissolved in 400 ml of pure water under normal pressure stirring. 8.12 g FeCl 3 ·6H 2 After O was dissolved in 100 ml of pure water, a ferric ion aqueous solution with a concentration of 0.3 mol / L was obtained, which was added dropwise to the tannic acid aqueous solution within 10 minutes, and the solution changed from light yellow to dark black. After continuous stirring at room temperature for 1.5 hours, the pH value of the solution was adjusted to 8.2 with 0.5 mol / L aqueous sodium hydroxide solution, and a large amount of black powder precipitated. A black powder was isolated by centrifugation at 7600 rpm for 10 min. The black powder was washed three times with pure water and ethanol respectively, and 15.3 g of active material was obtained after drying.
[0030] Preparation of lithium ion battery negative electrode: Mix 4 grams of active material and 2 grams of conductive carbon black evenly, then ...
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