Process for producing lithium ion battery negative pole material of lithium titanate
A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of complex synthesis process, long heat treatment time, high energy consumption, etc., and achieve simple preparation process and cheap and easy-to-obtain raw materials , the effect of broad application prospects
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[0025] Example 1: Lithium oxalate and anatase titanium dioxide (about 50 nm) with a molar ratio of 4.5:5 were placed in an 800 mL beaker, 500 mL of absolute ethanol was added, premixed with mechanical stirring for 3 hours, heated to 70° C. in a water bath, and stirred. , the solvent was evaporated to obtain a lithium oxalate / titanium dioxide premix. The premix was calcined in an air atmosphere, first kept at 200 °C for 2 h, then heated to 600 °C for 12 h, cooled and ground to obtain a spinel structure Li 4 Ti 5 O 12 .
[0026] The product has been tested by D / max2500PC 18KW micro-area X-ray diffractometer, and it is a spinel structure lithium titanate, such as Figure 5 (b); Tested by 1000HS / 3000HS laser particle analyzer, the average particle size is 360nm; SEM photos such as figure 1 shown.
Example Embodiment
[0027] Example 2: Dissolve lithium phosphate and anatase-type titanium dioxide (20-30 nm) in a molar ratio of 4.2:5 in 500 mL of deionized water, pre-mix with mechanical stirring for 3 hours, and dry at 120° C. for 12 hours in a blast drying oven to obtain Lithium Phosphate / Titanium Dioxide Premix. The premix was calcined in an air atmosphere, first kept at 250 °C for 3 h, then heated to 800 °C for 10 h, cooled and ground to obtain a spinel structure Li 4 Ti 5 O 12 .
[0028]The product has been tested by D / max2500PC 18KW micro-area X-ray diffractometer, and it is a spinel structure lithium titanate, such as Figure 5 (c); Tested by 1000HS / 3000HS laser particle analyzer, the average particle size is 505nm; SEM photos such as figure 2 shown.
Example Embodiment
[0029] Embodiment 3: Dissolve lithium chloride and amorphous titanium dioxide (15-20nm) with a molar ratio of 4.0:5 in 500 mL of ethylene glycol, premix with mechanical stirring for 3h, and spray dry to obtain a lithium chloride / titanium dioxide premix thing. The premix was calcined in an air atmosphere, first kept at 350 °C for 4 h, then heated to 1000 °C for 6 h, cooled and ground to obtain a spinel structure Li 4 Ti 5 O 12 .
[0030] The product has been tested by D / max2500PC 18KW micro-area X-ray diffractometer, and it is a spinel structure lithium titanate, such as Figure 5 (d); Tested by 1000HS / 3000HS laser particle analyzer, the average particle size is 1035nm; SEM photos such as image 3 shown.
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