Method for preparing negative electrode material lithium titanate of lithium battery through spray freeze drying

Abstract

The invention discloses a method for preparing a negative electrode material lithium titanate of a lithium battery through spray freeze drying. The method comprises the steps of weighing ingredients of a Ti compound, a Li compound and a metal oxide M at a stoichiometric ratio, dispersing the ingredients into distilled water, carrying out sanding, carrying out pelletizing through spray freeze drying by employing liquid nitrogen and liquid propane as refrigerants, and then burning to obtain an M-doped and modified lithium titanate material. The method is simple in process and high in controllability; the obtained material is excellent in high-rate capability and can be suitable for industrial production of the lithium titanate negative electrode material.

Description

technical field [0001] The invention relates to a preparation method of a battery electrode material, in particular to a method for preparing lithium titanate, a negative electrode material of a lithium battery, by spray freeze drying. Background technique [0002] At present, the anode materials of commercial lithium-ion batteries mostly use carbon anode materials, but carbon anode materials still have some defects: they react with the electrolyte to form a surface passivation film during the first discharge process, resulting in a low initial coulombic efficiency; The electrode potential of the carbon electrode is similar to that of metal lithium. When the battery is overcharged, lithium dendrites will be formed to cause a short circuit and cause safety problems. [0003] Lithium titanate, as an anode material for lithium-ion batteries that has attracted much attention in recent years, has gradually become a research hotspot. It has many advantages: (1) The crystal struct...

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Problems solved by technology

[0002] At present, the anode materials of commercial lithium-ion batteries mostly use carbon anode materials, but carbon anode materials still have some defects: they react with the electrolyte to form a surface passivation film during the first discharge process, resulting in a low initial coulombic efficiency; The electrode potential of the carbon electrode is similar to that of metal lithium. When the battery is overcharged, lithium dendrites will be formed to cause a short circuit, causing safety problems, etc.

[0004] However, lithium titanate is an insulating material with poor conductivity, rapid capacity decay and poor rate performance during high-current charging and discharging, which limits its application.

The existing preparation methods of lithium titanate are mainly spray drying and solid-phase methods, and element doping and surface carbon coating are used in the preparation process, although the above methods can solve the problem of poor electronic conductivity of lithium titanate materials to a certain extent , but its electrochemical performance is still unsatisfactory

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