Preparation method for lithium titanate composite material
A technology of composite materials and lithium titanate, which is applied in the fields of titanium compounds, chemical instruments and methods, and inorganic chemistry, can solve the problem of unsatisfactory initial discharge specific capacity of lithium titanate materials, and achieve high initial discharge specific capacity and production process simple effect
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[0009] According to the preparation method of lithium titanate composite material provided by the present invention, the method comprises calcining the mixture containing transition metal compound, carbon source, titanium dioxide, lithium source and low-temperature molten salt in an inert gas and removing the low-temperature molten salt, wherein, the The low-temperature molten salt is a substance that can be melted under calcination conditions and does not react with other components in the mixture.
[0010] In the mixture, the molar ratio of titanium dioxide, lithium source, transition metal compound, carbon source and low-temperature molten salt can be 1:0.8-0.9:0.01-0.15:0.1-0.5:0.5-1, preferably 1:0.8-0.85 :0.01-0.15:0.1-0.5:0.5-1.
[0011] The method of mixing titanium dioxide, lithium source, transition metal compound, carbon source and low-temperature molten salt is a conventional method, for example, stirring method can be used for mixing.
[0012] Described lithium s...
Embodiment 1
[0024] (1) Preparation of lithium titanate composite materials
[0025] 79.2 g TiO 2 , 34.4 g LiOH·H 2 O, 2.45 g MnAc 2 4H 2 O, 30 grams of lithium chloride and 34 grams of glucose (C 6 h 12 o 6 ·H 2 O) stirring and mixing evenly, in an argon atmosphere, at a temperature of 800°C, calcining for 8 hours, washing the resultant with 500ml deionized water, adding absolute ethanol as a dispersant, and ball milling at a speed of 300 rpm 5 hours, and then backfired for 16 hours at a temperature of 800° C. in an argon atmosphere to obtain a lithium titanate composite material M1.
[0026] (2) Preparation of pole piece
[0027] Add 80 parts by weight of lithium titanate composite material, 10 parts by weight of binder polytetrafluoroethylene (PTFE), and 10 parts by weight of conductive agent carbon black into 110 parts by weight of deionized water, and then stir to form a stable and uniform negative electrode slurry . After drying in a vacuum oven at 65° C. for 24 hours, take...
Embodiment 2
[0034] Battery A2 was prepared in the same manner as in Example 1, except that the lithium titanate composite material was prepared by mixing 76 grams of TiO 2 , 34.4 g LiOH·H 2 O, 12.25 g MnAc 2 4H 2 O, 30 grams of lithium chloride and 34 grams of C 6 h 12 o 6 ·H 2 O Stir and mix evenly, in an argon atmosphere, at a temperature of 800°C, calcined for 8 hours, wash the product with 500ml of deionized water, ball mill for 5 hours at a speed of 300 rpm, and then in an argon atmosphere In the process, at a temperature of 800° C., backfired for 16 hours to obtain a lithium titanate composite material M2.
[0035] The battery A2 was tested for performance in the same manner as in Example 1, and the results are shown in Table 1.
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