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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  • Abstract
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Problems solved by technology

However, the corrosion resistance of carbon materials is poor, and the structure is easy to change during the pr

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
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[0014] Example 1

[0015] (1) Dry nano-scale lithium titanate powder at 200°C for 2 hours; (2) Stir butyl titanate and absolute ethanol in a volume ratio of 1:4 with a stirrer, and gradually add acetic acid and acetic acid during the stirring process. Deionized water, the volume ratio of acetic acid to butyl titanate is 1:5.5, and the volume ratio of deionized water to butyl titanate is 1:10. Stir for 3 hours to obtain a uniform sol solution; (3) According to lithium titanate and titanium The ratio of the amount of butyl ester is 4.5:1. Add the lithium titanate powder to the titanium oxide sol solution, stir for 6 hours, vacuum filter, and vacuum dry at 30°C for 10 hours to obtain the precursor powder; (4) The precursor powder is reduced in a hydrogen atmosphere furnace at 830°C for 6 hours, cooled to 100°C, and taken out to obtain a titanium suboxide coated modified lithium titanate composite material.

[0016] Using lithium sheet as the negative electrode, in a glove box filled ...

Example Embodiment

[0017] Example 2

[0018] (1) Dry the micron-sized lithium titanate powder at 30°C for 10 hours; (2) Stir the butyl titanate and anhydrous ethanol at a volume ratio of 1:2 with magnetic force, and gradually add acetic acid and remove acetic acid during the stirring process. Ionized water, the volume ratio of acetic acid and butyl titanate is 1:2, and 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 lithium titanate and titanic acid The ratio of butyl ester is 11:1. Lithium titanate powder is added to the titanium oxide sol solution. After stirring for 48 hours, vacuum filtration is performed, and the precursor powder is obtained by vacuum drying at 150°C for 2 hours; (4) Precursor powder The bulk powder was reduced in a hydrogen atmosphere furnace at 870°C for 3 hours, cooled to 100°C, and discharged to obtain a titanium oxide-coated lithium titanate composite material.

[0019] Using lithium sheet...

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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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