Method for preparing spinelle lithium titanate for lithium ion battery negative electrode material

Abstract

The invention discloses a method for preparing spinelle lithium titanate for a lithium ion battery negative electrode material, which comprises the following steps of: weighing lithium salt and titanium dioxide in a molar ratio of Li to Ti of 1:(1.15-1.2); adding a rare earth compound and a dispersant into the lithium salt and the titanium dioxide; grinding the raw materials for 0.5 to 5 hours with a ball mill to fully mix the raw materials; baking the mixture in air or oxygen for 4 to 32 hours at the temperature of between 750 and 1,000 DEG C; and naturally cooling the mixture to normal temperature to obtain a Li4Ti5O12 / rare earth oxide composite electrode material. Due to the preparation method, the Li4Ti5O12 / rare earth oxide composite electrode material has good electrical conductivity and charge / discharge performance, and 100 to 300nm fine grains can be prepared. The preparation method has the advantages of simple process and low cost.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery, in particular to a preparation method of spinel lithium titanate used for a negative electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high voltage, large specific energy, long cycle life, and no environmental pollution. They have been widely used in portable electronic devices such as mobile phones, notebook computers, and small cameras, and have expanded to the fields of electric vehicles, satellites, and aerospace. application space. [0003] Most of the current commercial lithium-ion battery anode materials use various lithium-intercalated carbon materials. This carbon material has disadvantages such as easy precipitation of lithium dendrites, low initial charge and discharge efficiency, interaction with electrolyte, obvious voltage hysteresis, and complicated preparatio...

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Problems solved by technology

Although the doping and substitution of non-equivalent metal ions improves the electronic conductivity, most of them reduce the capacity and cycle performance; Li 4 Ti 5 o 12 The high-current charge and discharge performance of the / C composite electrode can be improved to a certain extent, but the process of inert atmosphere protection and other processes are added in the preparation process, the complexity of process control and the production cost increase; while the hydrothermal method, sol-gel method, package Silver-coated copper is a method for preparing composite electrode materials, which is difficult for large-scale industrial production; although the high-energy ball milling method can make the material particles finer, it is difficult to reduce the grain size, and the performance of high-current charging and discharging is not significantly improved.

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