Preparation method for lithium ion battery composite cathode material

Abstract

The invention discloses a preparation method for a lithium ion battery composite cathode material, and belongs to the field of new materials and electrochemistry, and aims to provide a compound electrode material capable of charging and discharging at a high magnification and an economical and feasible preparation process. The preparation method comprises the following steps of: preparing Li4Ti5O12-TiO2 nano particles by using lithium acetate and tetrabutyl titanate as raw materials and ammonia water as a pH value regulator, and adopting a solvent thermal bonding treatment method; then uniformly coating a carbon source on the surface of the Li4Ti5O12-TiO2 composite particles through a rotary evaporation process; and performing high-temperature pyrolysis to prepare a Li4Ti5O12-TiO2 / C composite material. The Li4Ti5O12-TiO2 / C composite material prepared by the method is fine in particle and uniform in particle size and composition distribution, has high magnification property and cyclical stability, can bring advantages of Li4Ti5O12, TiO2 and C into play, is an ideal high-magnification lithium ion battery composite cathode material, and can be widely used in the fields of portable electronic equipment, electric vehicles, aerospace and the like.

Description

technical field [0001] The invention belongs to the field of new materials and electrochemistry, and in particular relates to a lithium battery that can be charged and discharged at a high rate 4 Ti 5 o 12 -TiO 2 / C lithium ion battery composite negative electrode material and preparation method thereof. Background technique [0002] Under the dual pressure of energy crisis and environmental pollution, all countries are trying to find new energy sources. Lithium-ion batteries, the pioneer of green energy, are widely used in portable electronic devices, aerospace, military and other fields. At present, energy-saving and environmentally friendly electric vehicles are popular all over the world, making power batteries with high specific capacity, high cycle stability, and excellent rate performance become the focus of current research. [0003] The commercially widely used graphite-based carbon anode materials have some disadvantages: the potential of the carbon electrode i...

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Problems solved by technology

But its improved Li 4 Ti 5 o 12 The effect of material rate performance is not obvious; at the same time, doping elements enter Li 4 Ti 5 o 12 crystal lattice, which reduces the structural stability of the material to some extent

Wen Zhaoyin's group at the Shanghai Institute of Ceramics studied Li 4 Ti 5 o 12 Carried out cation doping modification research, synthesized Li by solid-phase method 3.95 m 0.15 Ti 4.9 o 12 (M=Al, Ga, Co) and Li 3.9 Mg 0.1 Al 0.15 Ti 4.85 o 12 , the study found that Al 3+ Doping is conducive to improving the specific capacity of the material, and its cycle performance is stable; doping Ga 3+ The specific capacity of the material is slightly improved, but the cycle stability is slightly reduced; Co 3+ and Mg 2+ Doping, to some extent reduces the Li 4 Ti 5 o 12 Electrochemical properties of materials (Shahua Huang, Zhaoyin Wen, Xiujian Zhu, Zuxiang Lin. Effects of dopant on the electrochemical performance of Li 4 Ti 5 o 12 as electrode material for lithium ion batteries. J. Power Sources 165 (2007) 408–412)

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