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Ti4O7-coated modified lithium titanate composite material and preparation method thereof

A titanium oxide and composite material technology, applied in the field of lithium ion batteries, can solve the problems of poor cycle performance of lithium ion batteries, poor corrosion resistance of carbon materials, easy structural changes, etc., to improve rate performance and cycle stability. The effect of passivation and corrosion resistance passivation

Inactive Publication Date: 2017-03-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion resistance of carbon materials is poor, and the structure is easy to change during the process of lithium ion intercalation and extraction, resulting in poor cycle performance of lithium ion batteries.

Method used

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  • Ti4O7-coated modified lithium titanate composite material and preparation method thereof
  • Ti4O7-coated modified lithium titanate composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Dry nanoscale lithium titanate powder at 200°C for 2 hours; (2) Mix butyl titanate and absolute ethanol at a volume ratio of 1:4 with a stirrer, and gradually add acetic acid and Deionized water, the volume ratio of acetic acid and butyl titanate is 1:5.5, the volume ratio of deionized water and butyl titanate is 1:10, stir for 3 hours to obtain a uniform sol solution; (3) according to the lithium titanate and titanium The molar ratio of butyl ester is 4.5:1. Add lithium titanate powder into titanium oxide sol solution, stir for 6 hours, vacuum filter, and vacuum dry at 30°C for 10 hours to obtain precursor powder; (4) The precursor powder was reduced in a hydrogen atmosphere furnace at 830°C for 6 hours, cooled to 100°C and released from the furnace to obtain titanium oxide-coated modified lithium titanate composite material.

[0016] Using a lithium sheet as the negative electrode, make a button battery in a glove box filled with argon, and do a constant current c...

Embodiment 2

[0018] (1) Dry micron-sized lithium titanate powder at 30°C for 10 hours; (2) Mix butyl titanate and absolute ethanol at a volume ratio of 1:2 using magnetic stirring, and gradually add acetic acid and remove Ionized water, the volume ratio of acetic acid and butyl titanate is 1:2, the volume ratio of deionized water and butyl titanate is 1:10, stir for 24 hours to obtain a uniform sol solution; (3) according to the lithium titanate and titanate The substance ratio of butyl ester is 11:1. Add lithium titanate powder into titanium oxide sol solution, stir for 48 hours, vacuum filter, and vacuum dry at 150°C for 2 hours to obtain precursor powder; (4) Precursor The bulk powder was reduced in a hydrogen atmosphere furnace at 870°C for 3 hours, cooled to 100°C and released from the furnace to obtain a titanium oxide-coated lithium titanate composite material.

[0019] Using a lithium sheet as the negative electrode, make a button battery in a glove box filled with argon, and do a ...

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Abstract

The invention discloses a Ti4O7-coated modified lithium titanate composite material and a preparation method thereof. A chemical formula of the Ti4O7-coated modified lithium titanate composite material is Li4Ti5O12 / Ti4O7. According to the technical scheme, lithium titanate is modified by adopting Ti4O7 with good conductivity and corrosion resistance as a coating layer, and a layer of Ti4O7 film coats the surface of the lithium titanate, so that the conductivity of the lithium titanate is effectively improved, corrosion of an electrolyte to a lithium titanate material is inhibited, the rate capability and the cycle performance are significantly improved, the Ti4O7-coated modified lithium titanate composite material adapts to the requirements of a power lithium-ion battery, and furthermore, the technique is simple in operation process and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a titanium oxide-coated modified lithium titanate composite material and a preparation method thereof. Background technique [0002] Spinel-type lithium titanate, as a new type of anode material for lithium-ion power batteries, has become an alternative material for carbon anode materials due to its excellent performance. During the charge and discharge process of this material, the intercalation and extraction of lithium ions will basically not cause changes in the crystal structure, which is called "zero strain material". Moreover, lithium titanate has a high lithium intercalation potential, is not easy to form lithium dendrites, and has good safety performance. However, due to the poor conductivity of lithium titanate, its specific capacity rapidly decays during high-rate charge and discharge, which is the key to restricting the commercial applicatio...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/48H01M10/0525
CPCH01M4/366H01M4/48H01M4/485H01M10/0525Y02E60/10
Inventor 林元华张晓燕李星王力君
Owner SOUTHWEST PETROLEUM UNIV
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