Lithium titanate negative electrode material and preparation method thereof
A negative electrode material, lithium titanate technology, applied in titanate, alkali metal titanate, chemical instruments and methods, etc., can solve problems such as low lithium ion diffusion coefficient and electronic conductivity
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[0026] According to a typical embodiment of the present invention, a preparation method of lithium titanate negative electrode material is provided. The preparation method comprises the following steps: uniformly mixing titanium source solution, lithium source solution and carbon nanotubes in an acidic solution to obtain a mixed slurry; drying the mixed slurry in a vacuum to obtain carbon nanotubes and lithium titanate materials a precursor; and calcining the precursor of the carbon nanotube and the lithium titanate material to obtain the lithium titanate negative electrode material.
[0027] Applying the technical solution of the present invention, due to the addition of carbon nanotubes, after the lithium titanate capacitor is prepared, the retention rate is still above 80% after the charge and discharge rate reaches 60C under normal temperature conditions.
[0028] In one embodiment of the present invention, the titanium source solution is a solution formed by dissolving a ...
Embodiment 1
[0042]1. Solution A: 3.707g butyl titanate was dissolved in isopropanol, solution B: 0.7185g lithium acetate was dissolved in a mixed solvent of isopropanol, deionized water and acetic acid. In solutions A and B, the molar ratio of lithium and titanium is controlled at 1:1, and the carbon nanotubes have a tubular structure composed of 10-20 layers of graphene. Carbon nanotubes are prepared by chemical vapor deposition, the particle size distribution is 15-20nm, and the specific surface area is about 200m 2 / g. Solution A and solution B and 1.0 g of carbon nanotubes were uniformly mixed in a UC container, and the ratio of carbon nanotubes and lithium titanate materials was determined according to the molar ratio of titanium, and then mixed with vigorous stirring. The mixed slurry was dried in a vacuum drying environment at 80° C. for 17 hours to obtain precursors of carbon nanotubes and lithium titanate materials.
[0043] Above-mentioned carbon nanotube preparation method is...
Embodiment 2
[0062] Basically the same as Example 1, the difference is the use of Li 4 Ti 5 o 12 / CNF=70 / 30 is applied to the hybrid capacitor system.
[0063] Figure 5 Different proportions of Li are shown 4 Ti 5 o 12 / CNF (others are the same as in embodiment 1) the contrast chart of hybrid capacitor system and traditional capacitor system.
[0064] Figure 5 For the hybrid capacitor system ((nc-Li 4 Ti 5 o 12 / CNF) / AC) / AC laminated battery charge and discharge data graph. Using Li 4 Ti 5 o 12 / CNF=50 / 50 and 70 / 30 two specific gravity composite materials are used as the active material of the hybrid capacitor system. at 0.2-30mAcm -2 (0.18-26.8Ag -1 ) is equivalent to charging and discharging between 1.5-3.0V in different current density ranges of 1-140C. As a comparison, a conventional EDLC system (AC / TEABF 4 -PC / AC), at 0.1-1kWl -1 In the low power density range, it is measured between 0-3.0V. In 0.1-1kW·L -1 In the low power density range, measured between 0-3.0V,...
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Abstract
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