Method for preparing spinel-structure lithium titanate
A technology of structural lithium titanate and spinel, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve the problems of voltage lag, cost increase, low utilization rate of reaction furnace, etc., and achieve uniform particle size and small particle size Effect
Inactive Publication Date: 2012-10-17
王洪 +2
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Problems solved by technology
[0002] At present, most commercial lithium-ion battery anode materials use various carbon materials, and the use of carbon materials has the following disadvantages: the potential of carbon materials is very close to that of metal lithium, and when the battery is overcharged, metal lithium may be precipitated on the surface of the carbon electrode. Formation of lithium dendrites, resulting in short circuit; low initial charge and discharge efficiency; reaction with electrolyte; significant voltage hysteresis
Its disadvantages are also obvious: the addition of organic compounds increases the cost; during the sintering process, gelation into powder is a process of violent volume expansion, so the utilization rate of the reaction furnace is low; organic matter produces a large amount of CO2 gas
Method used
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Experimental program
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Embodiment Construction
[0018] Use titanium tetrachloride as the titanium source, add dropwise to the citric acid solution at a molar ratio of citric acid to titanium of 1:1, react at 50°C for a few minutes, let stand for a few minutes, add concentrated ammonia water to adjust the pH to 7-8 , the temperature was raised to 80°C, lithium hydroxide solution was added dropwise, mixed with the above-mentioned precursor according to the molar ratio of lithium to titanium of 4.1:5, reacted at 80°C until sol, and dried at 200°C to remove ammonium chloride, Then, the amorphous lithium titanate was calcined at 850° C. for 6 hours in an air atmosphere to obtain spinel lithium titanate.
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The invention discloses a method for preparing a spinel-structure lithium titanate. The method is characterized in that citric acid and titanium undergo a reaction according to a ratio of 1: 1 with stirring; reaction products are stood for multiple minutes and then react with 1.57g of LiOH.H2O at a temperature of 80 DEG C; reaction products are dried at a temperature of 200 DEG C to form dry gel; and the dry gel is calcined at a temperature of 600 to 850 DEG C in air to form the spinel-structure lithium titanate. The method has the advantages that cheap inorganic titanium sources are used as raw materials; a process flow is simple; and a cost is low.
Description
technical field [0001] The invention belongs to the technical field of lithium ion battery negative electrode material preparation, and relates to a preparation method of spinel lithium titanate. Background technique [0002] At present, most commercial lithium-ion battery anode materials use various carbon materials, and the use of carbon materials has the following disadvantages: the potential of carbon materials is very close to that of metal lithium, and when the battery is overcharged, metal lithium may be precipitated on the surface of the carbon electrode. Formation of lithium dendrites, resulting in short circuit; low initial charge and discharge efficiency; reaction with electrolyte; significant voltage hysteresis. Compared with carbon negative electrodes, alloy-based negative electrode materials generally have higher specific capacity, but poor cycle performance. In comparison, lithium titanate has obvious advantages as a lithium ion negative electrode material: i...
Claims
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Inventor 王洪罗菲菲李想蔡元礼
Owner 王洪