Method for preparing nano lithium titanate by template method

Abstract

The invention discloses a method for preparing nano-lithium titanate by a template method. The industrial titanium salt is added to water to completely hydrolyze the industrial titanium salt to obtain a transparent aqueous solution A; 4 parts of sodium hydroxide are added to A for neutralization reaction, Obtain metatitanic acid precipitation B; wash the acid ion of the industrial titanium salt contained in B with distilled water to obtain gel-like metatitanic acid C; add lithium hydroxide and organic templates to C and mix to obtain precursor D; D is dried and dehydrated to obtain a mixture E of nano-titanium dioxide, lithium hydroxide and an organic template; adding an organic solvent to E to dissolve and recover the organic template to obtain a mixture F of nano-titanium dioxide and lithium hydroxide as a secondary template; Calcination to obtain nano lithium titanate. The invention adopts a template method to prepare lithium titanate, selects industrial titanium salt and lithium hydroxide as raw materials, and commercially available organic compounds as template materials to prepare nanometer lithium titanate, which can save production cost and ensure accurate lithium-titanium ratio of the product.

Description

technical field [0001] The invention relates to a method for preparing nanometer lithium titanate, in particular to a method for preparing nanometer lithium titanate by template method. Background technique [0002] At present, lithium-ion batteries have been widely used in portable electronic products such as notebook computers and mobile phones. The negative electrodes of lithium-ion batteries mostly use various lithium-intercalated carbon materials, but carbon negative electrode materials have potential safety hazards. The voltage of lithium-ion inserted into carbon materials Low, at this voltage, most electrolytes are unstable, and during the first charge and discharge process, the carbon material absorbs the lithium of the positive electrode to form a dense passivation film (SEI film) on its surface, when the temperature is higher , the SEI film will decompose, which will bring hidden dangers to the battery. Researchers have explored other anode materials such as oxide...

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Problems solved by technology

[0002] At present, lithium-ion batteries have been widely used in portable electronic products such as notebook computers and mobile phones. The negative electrodes of lithium-ion batteries mostly use various lithium-intercalated carbon materials, but carbon negative electrode materials have potential safety hazards. The voltage of lithium-ion inserted into carbon materials Low, at this voltage, most electrolytes are unstable, and during the first charge and discharge process, the carbon material absorbs the lithium of the positive electrode to form a dense passivation film (SEI film) on its surface, when the temperature is higher , the SEI film will decompose, bringing hidden dangers to the battery

Researchers have explored other anode materials such as oxides and sulfides, but these materials have problems with safety and cycle performance

Lithium titanate (Li 4 Ti 5 o 12 ) has been extensively studied as a superconducting material. In the late 1980s, it was studied as a positive electrode material for lithium-ion batteries, but because it has a low potential relative to lithium and a low specific energy (theoretical specific capacity is 175mAh / g), and failed to attract widespread attention

However, the cost of the current method for preparing nano-lithium titanate is very high, and it is not easy to remove impurities in the preparation process, and it needs to be washed in the subsequent process. Lithium ion content is affected, it is difficult to guarantee the accurate lithium-titanium ratio of the product

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