Method for preparing lithium titanate cathode material of lithium ion battery

Abstract

The invention discloses a preparation method of a lithium titanate cathode material for a lithium ion battery. Titanium dioxide colloid is taken as an initial raw material; the titanium dioxide colloid and lithium hydroxide are added to a mixture of water and ethanol while stirring, then the obtained solution is transferred to a hydrothermal reaction kettle for hydrothermal ion exchange reaction at 150-200 DEG C for 10-18h, the reacted solution is naturally cooled to room temperature, then filtered to obtain white precipitate; the obtained precipitate is placed in a muffle furnace with the temperature of 350-600 DEG C for 1-3h heat treatment to obtain the lithium titanate cathode material used in the lithium ion battery. The lithium titanate cathode material which is used in the lithium ion battery and synthesized by the method has stable discharge specific capacity of 125mAh / g at the rate of 20C (3.5A / g), and has good high-rate charge and discharge performance.

Description

technical field [0001] The invention relates to a method for preparing battery electrode materials, in particular to a method for lithium titanate negative electrode materials applied to lithium ion batteries. Background technique [0002] As a promising electrode material for lithium-ion batteries, spinel lithium titanate has the characteristic of "zero strain" in which the skeleton structure hardly changes during charging and discharging, and has a high lithium intercalation potential (1.55V Vs Li / Li+) is not easy to cause metal lithium to precipitate, and does not react with the electrolyte at the same time. It has very superior cycle performance and safety performance. In addition, lithium ions diffuse quickly in lithium titanate materials, which is conducive to improving the high-rate charge and discharge of lithium-ion batteries. Therefore, this material has received extensive attention from researchers. [0003] A lithium titanate material particle size synthesized ...

AI Technical Summary

Problems solved by technology

The product prepared by the sol-gel method has high chemical purity, good uniformity, and low heat treatment temperature, but the cost increases due to the addition of organic compounds during the synthesis process

[0005] CN1725530A and Electrochemistry Communications 7 (2005) 894-899 reported a nanotube and wire-shaped lithium titanate material synthesized by a hydrothermal ion exchange method, with a specific capacity of 120mAh g at a charge-discharge rate of 1.0C -1 However, this synthesis method uses titanate nanotubes and wires as precursors, and the synthesis requirements and costs are relatively high, so it is not suitable for industrial applications

But this preparation method operation process is more complicated, and operation requirement is higher

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