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Surface-modified lithium titanate and preparation method thereof

A technology of surface modification and lithium titanate, which is applied in the field of lithium-ion batteries, can solve problems such as incomplete coating, and achieve the effects of reducing catalytic activity, good repeatability, and low cost

Active Publication Date: 2013-07-10
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gas generation can be suppressed to a certain extent by coating lithium titanate, but due to incomplete coating, there are some reactive active sites that are not coated, and these active sites will still contact and react with the electrolyte, so Surface cladding cannot fundamentally solve this problem

Method used

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  • Surface-modified lithium titanate and preparation method thereof
  • Surface-modified lithium titanate and preparation method thereof

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preparation example Construction

[0021] The method for preparing surface-modified lithium titanate according to the second aspect of the present invention is used to prepare the surface-modified lithium titanate according to the first aspect of the present invention, comprising the step of: dissolving lithium titanate particles in the first inorganic water organic solvent to obtain a suspension; the organophosphorus compound is added to the suspension; after the reaction is completed, the suspension is subjected to suction filtration; the solid obtained after the suction filtration is treated with a second anhydrous organic solvent After washing and drying, the surface-modified lithium titanate is obtained; wherein, the organophosphorus compound is a phosphine oxide compound represented by the general formula (1) O=P-RR'R'', and is represented by the general formula (2) A phosphinate compound represented by O=P-(OR)R'R'', a phosphonate compound represented by the general formula (3) O=P-(OR)(OR')R'', or Phosp...

Embodiment 1

[0029] Add 50 g of lithium titanate particles with a particle size of 10 nm into 250 mL of absolute ethanol in a dry atmosphere, and then stir at a speed of 500 rpm for 30 min to obtain a uniformly dispersed suspension;

[0030] Add trimethyl phosphate (the mass ratio of trimethyl phosphate to lithium titanate is 0.01:100) under stirring conditions, and keep stirring for 3 hours after the addition is complete;

[0031] After the reaction is over, perform suction filtration on the suspension after the reaction, put the solid obtained after suction filtration into a beaker, add 100mL of absolute ethanol to wash, stir and disperse the solid, and then suction filter, repeat this three times, and dry Obtain the lithium titanate of surface passivation afterwards;

[0032]Among them, the lithium titanate surface is distributed with a structure formula of -O-P-(OCH 3 ) 3 The passivation group, between the passivation group and lithium titanate particles with Ti-O-P-(OCH 3 ) 3 bond...

Embodiment 2

[0034] Add 50 g of lithium titanate particles with a particle size of 50 nm into 250 mL of anhydrous methanol in a dry atmosphere, and then stir at a speed of 500 rpm for 30 min to obtain a uniformly dispersed suspension;

[0035] Add methyl ethyl n-octyl phosphonate (wherein the mass ratio of methyl ethyl n-octyl phosphonate to lithium titanate is 0.1:100) under stirring conditions, keep the rotation speed constant after the addition and continue stirring for 1 h;

[0036] After the reaction, the suspension after the reaction was subjected to suction filtration, the solid obtained after the suction filtration was placed in a beaker, 100 mL of anhydrous isopropanol was added for washing, the solid was stirred and dispersed, and then suction filtered, and so repeated three times, Obtain the lithium titanate of surface passivation after drying;

[0037] Among them, the lithium titanate surface is distributed with a structure formula of -O-P-(C 7 h 14 CH 3 )(OCH 2 CH 3 )(OCH...

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Abstract

The invention provides a surface-modified lithium titanate and a preparation method thereof. The surface-modified lithium titanate is distributed on the surface with passivation groups: -O-P-RR'R'',-O-P-(OR) R'R'',-O-P-(OR) (OR ') R'',-O-P-(OR) (OR ') (OR''), wherein R, R' and R'' are same or different C1-C8 alkyl or alkenyl, and the passivation groups and the lithium titanate are bonded in a bonding or bridging way. The surface-modified lithium titanate provided by the invention can effectively reduce catalytic activity, minimize swelling of lithium ion battery, and further improve high-temperature storage and high-temperature cycling performances of the lithium ion battery. The preparation method is simple, good in repeatability, low in cost, little in environmental pollution and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a surface-modified lithium titanate and a preparation method thereof. Background technique [0002] Lithium titanate is a zero-strain material. When it is used as the negative electrode material of lithium-ion batteries, lithium-ion batteries have the characteristics of good cycle performance and long service life. Studies have found that when lithium titanate is used as the negative electrode material, the cycle life of lithium-ion batteries at room temperature can reach more than 20,000 times, which makes lithium titanate have a good application prospect in lithium-ion batteries. In addition, the lithium-ion battery using lithium titanate as the negative electrode material (hereinafter referred to as "lithium titanate battery") also has the characteristics of stable discharge voltage and high voltage platform, and will not cause lithium precipitation, so it has high safety....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62
CPCC07F9/091C07F9/3211C07F9/327C07F9/4006C07F9/4015C07F9/5304H01M4/131H01M4/366H01M4/485H01M4/62H01M10/4235Y02E60/10
Inventor 闫传苗钟开富
Owner NINGDE AMPEREX TECH
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