A kind of lithium ion battery anode material li 4 ti 5 o 12 /tio 2 Nanosheet array and its preparation method and application
A nanosheet array and lithium-ion battery technology, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve problems such as large amount of solvents, cumbersome methods, and unfavorable large-scale production of synthesis methods , to achieve the effect of solving potential safety hazards, increasing specific capacity, and improving electrochemical performance
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[0023] In order to solve the problems of complex preparation process, cumbersome solvents and difficult control conditions in the previous lithium-ion battery negative electrode materials and preparation methods, and the obtained battery negative electrode materials are only ordinary 2D sheet materials, this embodiment provides a lithium ion battery. Li ion battery anode material 4 Ti 5 o 12 / TiO 2 A method for preparing a nanosheet array, comprising the steps of:
[0024] 1) At room temperature, add 0.500-0.530g CH 3 COOLi·2H 2 O is placed in 40ml of deionized water, fully stirred to dissolve it completely; then add 1.0-1.2g of titanyl sulfate, mix well, then add dilute ammonia solution, adjust the pH of the solution to 9-11, under airtight conditions, After 10-12 hours of reaction, a milky white reaction solution was obtained;
[0025] 2) Move the obtained milky white solution into a reaction kettle, react at 130-140°C for 20-24h, centrifuge, collect the precipitate, w...
Embodiment 1
[0036] Lithium-ion battery anode material Li 4 Ti 5 o 12 / TiO 2 nanosheet array
[0037] (1) Preparation method:
[0038] 1) At room temperature, 0.515g CH 3 COOLi·2H 2 O was placed in 40ml of deionized water, and magnetically stirred to make it fully dissolved; then 1.1g of titanyl sulfate was added, mixed well, and then 5% dilute ammonia solution was added dropwise to make the pH of the solution 10. , reacted for 10-12h to obtain a milky white reaction solution;
[0039] 2) Transfer the obtained milky white reaction liquid to a 100ml reaction kettle, react at 130-140°C for 20-24h, centrifuge, collect the powder precipitate at the bottom of the reaction kettle, wash with ethanol for 3-5 times, and vacuum dry at 70-80°C for 6-8h. Obtain product precursor;
[0040] 3) The precursor is calcined in an air atmosphere at 490-500°C for 2-3 hours in a muffle furnace, cooled naturally to room temperature, and ground to obtain the target product.
[0041] (2) Detection
[004...
Embodiment 2
[0046] Lithium-ion battery anode material Li 4 Ti 5 o 12 / TiO 2 Applications of Nanosheet Arrays
[0047] For the material obtained in embodiment 1 and Li 4 Ti 5 o 12 The materials were used as the negative electrode material of the battery, and the lithium sheet was used as the counter electrode, and the button battery was assembled, and the electrochemical performance test was carried out on it. The results are shown in Table 1.
[0048] Table 1 Comparison of electrochemical properties of different anode materials (charge and discharge rate 0.5C)
[0049]
[0050] According to the above studies, compared with ordinary Li 4 Ti 5 o 12 Negative electrode material, Li synthesized by the method of the present invention 4 Ti 5 o 12 / TiO 2 The electrochemical performance of the nanosheet array composite is significantly improved, which is significantly better than that of ordinary Li 4 Ti 5 o 12 Negative material. Negative electrode material Li synthesized by th...
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