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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 problem, Suppression of flatulence problems, guaranteed effect of capacity and cycle performance

Active Publication Date: 2013-03-27
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the battery development, it was found that the power lithium-ion battery of the lithium titanate system generally has the problem of flatulence, which seriously affects the performance of the battery.
The reason may be that it is easy to generate overpotential during actual use, so that the potential of the negative electrode of the lithium battery drops below 1V, resulting in the decomposition of lithium titanate and the electrolyte to produce gas that has nowhere to be released, causing gas swelling, affecting the capacity and cycle of the battery sex

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Weigh the lithium salt and titanium dioxide according to the molar ratio of lithium and titanium elements being 0.8, perform ball milling dispersion treatment with alcohol for 6 hours, and dry the slurry in a drying oven at 80 degrees for 10 hours. Place the dried precursor in an air atmosphere in a muffle furnace and heat it up to 580°C for 2 hours at a rate of 2°C / min, then raise it to 800°C at the same rate for 10 hours, then cool it down to room temperature naturally That is, a pure-phase nano-lithium titanate material is obtained.

[0026] (2) Using deionized water as a solvent, add a certain amount of polyammonium methacrylate, and disperse the nano-lithium titanate powder. First use ultrasonic vibration for about 20 minutes, then stir and heat in a constant temperature water bath at 50°C for about 30 minutes to obtain a uniformly dispersed and stable suspension, in which the mass percentage of ammonium polymethacrylate is 0.5%.

[0027] (3) Add AlCl to the l...

Embodiment 2

[0030] (1) Weigh the lithium salt and titanium dioxide according to the molar ratio of lithium and titanium elements being 0.82, perform ball milling dispersion treatment with alcohol for 8 hours, and dry the slurry in a drying oven at 100 degrees for 10 hours. Place the dried precursor in an air atmosphere in a muffle furnace and heat it up to 600°C for 4 hours at a rate of 5°C / min, then raise it to 850°C at the same rate for 12 hours, then cool it down to room temperature naturally That is, a pure-phase nano-lithium titanate material is obtained.

[0031] (2) Using deionized water as a solvent, add a certain amount of polyammonium methacrylate, and disperse the nano-lithium titanate powder. First use ultrasonic vibration for about 20 minutes, then stir and heat in a constant temperature water bath at 60°C for about 30 minutes to obtain a uniformly dispersed and stable suspension, in which the mass percentage of ammonium polymethacrylate is 1.5%.

[0032] (3) Add AlCl to the...

Embodiment 3

[0035] (1) Weigh the lithium salt and titanium dioxide according to the molar ratio of lithium and titanium elements being 0.84, perform ball milling and dispersion treatment with alcohol for 10 hours, and dry the slurry in a drying oven at 120 degrees for 12 hours. Place the dried precursor in an air atmosphere in a muffle furnace and heat it up to 650°C for 6 hours at a rate of 10°C / min, then raise it to 900°C at the same rate for 14 hours, then cool it down to room temperature naturally That is, a pure-phase nano-lithium titanate material is obtained.

[0036] (2) Using deionized water as a solvent, add a certain amount of polyammonium methacrylate, and disperse the nano-lithium titanate powder. First use ultrasonic vibration for about 20 minutes, then stir and heat in a constant temperature water bath at 80°C for about 30 minutes to obtain a uniformly dispersed and stable suspension, in which the mass percentage of ammonium polymethacrylate is 2.5%.

[0037] (3) Add AlCl ...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485
CPCY02E60/122Y02E60/10
Inventor 杨茂萍王康平郭钰静徐小明张羽
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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