Method for preparing spinel lithium titanate

A spinel type, lithium titanate technology, applied in the directions of titanate, alkali metal titanate, chemical instruments and methods, etc., to achieve low production cost, overcome low tap density, and overcome low electrical conductivity. Effect

Inactive Publication Date: 2014-12-10
李建明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no method that can prepare both spinel lithium titanate nanowires and spinel lithium titanate with nano-micro hierarchical structure.

Method used

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  • Method for preparing spinel lithium titanate
  • Method for preparing spinel lithium titanate
  • Method for preparing spinel lithium titanate

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Under stirring conditions, 0.5 g of titanium sulfate was dispersed and dissolved in 100 ml of deionized water. Ammonia water with a concentration of 0.1 mole per liter is slowly added dropwise to the above solution until the solution is neutral, and the titanium sulfate is gradually hydrolyzed to form hydrous titanic acid precipitation. The hydrated titanic acid precipitate is ultrasonically dispersed, washed with deionized water for many times, and centrifuged to obtain the washed hydrated titanic acid precipitate. Lithium hydroxide was added to a hydrogen peroxide aqueous solution with a volume fraction of 2% hydrogen peroxide to obtain a hydrogen peroxide aqueous solution containing a lithium ion concentration of 0.5 mole per liter. Disperse the washed hydrous titanic acid precipitate in 40 ml of the lithium ion-containing hydrogen peroxide solution to obtain a mixture. After stirring the mixture for 1 hour, hydrothermally react at 100 degrees Celsius for 4 hours, an...

Embodiment 2

[0053] Under stirring conditions, 1 g of titanium sulfate was dispersed and dissolved in 100 ml of deionized water. Sodium hydroxide with a concentration of 0.1 mole per liter is slowly added dropwise to the above solution until the solution is neutral, so that titanium sulfate is gradually hydrolyzed to generate hydrous titanic acid precipitation. The hydrated titanic acid precipitate is ultrasonically dispersed, washed with deionized water for many times, and centrifuged to obtain the washed hydrated titanic acid precipitate. Lithium hydroxide was added to a hydrogen peroxide aqueous solution with a volume fraction of 2% hydrogen peroxide to obtain a hydrogen peroxide aqueous solution containing a lithium ion concentration of 0.2 mole per liter. Disperse the washed hydrated titanic acid precipitate in 80 ml of the hydrogen peroxide aqueous solution containing lithium ions to obtain a mixture. After stirring the mixture for 2 hours, it was subjected to hydrothermal reaction a...

Embodiment 3

[0055] Under stirring conditions, 1 g of titanium sulfate was dispersed and dissolved in 100 ml of deionized water. Sodium hydroxide with a concentration of 0.1 mole per liter is slowly added dropwise to the above solution until the solution is neutral, so that titanium sulfate is gradually hydrolyzed to generate hydrous titanic acid precipitation. The hydrated titanic acid precipitate is ultrasonically dispersed, washed with deionized water for many times, and centrifuged to obtain the washed hydrated titanic acid precipitate. Lithium hydroxide was added to a hydrogen peroxide solution with a volume fraction of 2% to obtain a hydrogen peroxide solution containing a lithium ion concentration of 1 mole per liter. Disperse the washed hydrated titanic acid precipitate in 80 ml of the hydrogen peroxide aqueous solution containing lithium ions to obtain a mixture. After stirring the mixture for 1 hour, it was subjected to hydrothermal reaction at 100 degrees Celsius for 4 hours, an...

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PUM

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Abstract

The invention discloses a method for preparing spinel lithium titanate. The method is characterized by comprising the steps of S1, performing hydrolysis reaction on a titanium source to obtain hydrated titanium acid sediments; S2, dispersing the hydrated titanium acid sediments into lithium ion-containing hydrogen peroxide aqueous solution to obtain a mixture; S3, performing hydrothermal reaction on the mixture to obtain nanowire type lithium titanate and / or lithium titanate with a nano differential level structure; S4, annealing the nanowire type lithium titanate and / or the lithium titanate with the nano differential level structure to obtain nanowire type spinel lithium titanate and / or the spinel lithium titanate with the nano differential level structure. According to the method, both spinel lithium titanate nanowires and the spinel lithium titanate with the nano differential level structure can be prepared.

Description

Technical field [0001] The invention relates to the field of preparation of lithium ion battery negative electrode materials, in particular to a method for preparing spinel-type lithium titanate. Background technique [0002] Spinel-type lithium titanate is a "zero tension" material, and its charge and discharge cycle can reach thousands of times. It is an ideal and promising anode material for lithium ion batteries. Spinel-type lithium titanate has the following advantages: (1) Spinel-type lithium titanate is a zero-strain material with a long cycle life; (2) Spinel-type lithium titanate has a stable discharge voltage, and the electrolyte does not occur Decomposition can improve the safety performance of lithium batteries; (3) Spinel-type lithium titanate anode materials have a higher lithium ion diffusion coefficient than carbon anode materials, and can be charged at a high rate. Discharge; (4) The electric potential of spinel-type lithium titanate is higher than that of pure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485C01G23/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G23/005H01M4/485Y02E60/10
Inventor 李建明
Owner 李建明
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