Preparation method of aluminum-oxide-coated nano lithium titanate composite material

A nano-lithium titanate, composite material technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of affecting battery capacity and cycle, easy to generate overpotential, affecting battery performance, etc., to improve battery flatulence problems, Suppression of flatulence problems, guaranteed effect of capacity and cycle performance
CN102376947AActive Publication Date: 2012-03-14HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HEFEI GUOXUAN HIGH TECH POWER ENERGY
Publication Date
2012-03-14

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Abstract

The invention discloses a preparation method of aluminum-oxide-coated nano lithium titanate composite material, which comprises the steps of: adding aluminum salt solution into prepared Li4Ti5O12 suspending liquid under the stirring condition, wherein the adding quantity of the aluminum salt solution is in accordance with the molar ratio as follows: Ti: Al=5: x, and x=0.01-0.55; simultaneously, adding a right amount of ammonia water, and adjusting the pH value to be 8-10; stirring for reaction for 30-50 minutes, and standing still for about 6 hours; after filtering, washing and drying, obtaining precursor of the aluminum-oxide-coated nano lithium titanate composite material; and finally, sintering the obtained precursor of the aluminum-oxide-coated nano lithium titanate composite materialat 400-600 DEG C for 4-10 hours, naturally cooling to be room temperature, and obtaining the aluminum-oxide-coated nano lithium titanate composite material.
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Description

technical field

[0001] The invention relates to the field of electrochemical material preparation technology and energy, in particular to a preparation method of aluminum oxide-coated nano-lithium titanate composite material. Background technique

[0002] Spinel lithium titanate has attracted increasing attention as a new anode material for lithium-ion batteries. It has a high Ti 4+ / Ti 3+ (1.55V vs Li + / Li) redox potential, without the formation of SEI film on its surface, it has higher energy conversion efficiency and higher safety than carbon negative electrode and metal lithium; it has a spinel structure, and its volume is almost the same during charge and discharge. Does not change, so it has better cycle life than carbon negative electrode as a lithium ion battery negative electrode material; it has a three-dimensional lithium ion diffusion channel, which is conducive to the rapid deintercalation reaction of lithium ions, and has excellent high-rate charge and disc...

Claims

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