Preparation method of lithium titanate with special morphology

A technology of lithium titanate and morphology, applied in the field of electrochemical materials, can solve the problems of low theoretical capacitance, limited electrochemical performance and application of lithium titanate, low electronic conductivity, etc. The effect of increasing the specific surface area

Active Publication Date: 2013-11-13
HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low electronic conductivity and low theoretical capacitance are two major disadvantages of lithium titanate materials
This greatly limits the electrochemical performance and application of lithium titanate

Method used

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  • Preparation method of lithium titanate with special morphology
  • Preparation method of lithium titanate with special morphology
  • Preparation method of lithium titanate with special morphology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of method that prepares tubular lithium titanate with bamboo fiber as template, comprises the following steps:

[0032] (1) Take 0.75g of pulverized bamboo fibers, add 20ml of lithium acetate ethanol solution with a concentration of 0.69mol / L, and disperse ultrasonically for 1 hour (ultrasonic frequency is 35KHz) to obtain suspension A.

[0033] (2) According to the molar ratio Li / Ti=0.8, an appropriate amount of tetrabutyl titanate was dropped into the suspension A above to obtain the suspension B. After continuous stirring for 8 minutes, the suspension B was placed on a temperature-controlled magnetic stirrer, stirred and evaporated to dryness at 60° C. to obtain a precursor C of tubular lithium titanate.

[0034] (3) Grind C and place it in a muffle furnace for segmental calcination under air conditions (calcination conditions: calcination at 450°C for 5 hours and then calcination at 750°C for 10 hours), and then cool to 30°C to obtain tubular lithium titanate...

Embodiment 2

[0041] A method for preparing sheet lithium titanate with bagasse fiber as a template, comprising the following steps:

[0042] (1) Take 1 g of crushed bagasse, add 20 ml of 0.5 mol / L lithium acetate ethanol solution, and ultrasonically disperse for 1 hour (ultrasonic frequency is 35KHz) to obtain suspension A.

[0043] (2) According to the molar ratio Li / Ti=0.82, an appropriate amount of tetrabutyl titanate was dropped into the suspension A above to obtain the suspension B. After continuous stirring for 10 minutes, the suspension B was placed on a temperature-controlled magnetic stirrer, stirred and evaporated to dryness at 80°C to obtain a precursor C of tubular lithium titanate.

[0044] (3) Grind C and place it in a muffle furnace for calcination in sections under air conditions (calcination conditions: calcination at 450°C for 5 hours and then calcination at 750°C for 10 hours), and then cool to 40°C to obtain flaky lithium titanate products: Such as figure 2 As shown,...

Embodiment 3

[0049] A method for preparing porous block lithium titanate with bamboo charcoal as a template, comprising the following steps:

[0050] (1) Take 0.5 g of pulverized bamboo charcoal, add 20 ml of lithium acetate ethanol solution with a concentration of 1.0 mol / L, and ultrasonically disperse for 1 hour (ultrasonic frequency is 35KHz) to obtain suspension A.

[0051] (2) According to the molar ratio Li / Ti=0.84, an appropriate amount of tetrabutyl titanate was dropped into the suspension A above to obtain the suspension B. After continuous stirring for 5 minutes, the suspension B was placed on a temperature-controlled magnetic stirrer, stirred and evaporated to dryness at 40° C. to obtain a precursor C of tubular lithium titanate.

[0052] (3) After grinding C, place it in a muffle furnace for segmental calcination under air conditions (calcination conditions: calcination at 450°C for 5 hours, then calcination at 750°C for 10 hours), and then cool to 25°C to obtain porous block l...

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Abstract

The invention discloses a preparation method of lithium titanate with special morphology. The method comprises the following steps of: crushing a biomass material, then carrying out ultrasonic dispersion on the crushed biomass material in a lithium acetate ethanol solution and adding tetrabutyl titanate drop by drop according to the mol ratio of Li to Ti being 0.8-0.84; continuously stirring for 5-10 minutes and then heating and evaporating solvent to obtain a precursor of the lithium titanate; and calcining the precursor of the lithium titanate in the air and then cooling the clacined precursor to be room temperature to obtain the lithium titanate with tubular, sheet or porous structure. According to the method disclosed by the invention, the tetrabutyl titanate is taken as a raw material, has low price and wide sources; and the green and toxic-free biomass material is taken as a template, thus the lithium titanate with special morphology is synthesized at lower temperature. The method has the advantages of simpleness, strong maneuverability, favorable repetitiveness, easiness for industrial production and wide application prospect.

Description

technical field [0001] The invention belongs to the field of electrochemical materials, in particular to lithium ion battery negative electrode materials, in particular to a preparation method of lithium titanate with special morphology. Background technique [0002] Pure phase lithium titanate (Li 4 Ti 5 o 12 ) is a spinel structure, the oxygen ions are arranged in face-centered cubic stacking, located at the 32e position, 3 / 4 of the lithium ions occupy the tetrahedral 8a position, and the remaining lithium and titanium ions are located at the 16d octahedral position. This crystal structure provides a three-dimensional diffusion channel for lithium intercalation and extraction. With the intercalation of lithium, its lattice constant and volume change are small, so it is called "zero-strain material". The flexible electronic structure of titanium ions in the process of lithium intercalation and desorption makes lithium titanate anode materials have good electrochemical p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00
Inventor 禹筱元邵丹何嘉荣罗颖刘慧平方岳平
Owner HUNAN ZOOMWE NEW ENERGY TECH CO LTD
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