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Novel titanium dioxide cathode material of power lithium ion cell and preparation method thereof

A lithium-ion battery and titanium dioxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low charge and discharge capacity, general rate performance, and influence on the development of power lithium-ion batteries, and achieve high charge and discharge capacity and good rate The effect of performance and cycle performance

Active Publication Date: 2010-08-25
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commercialized Degussa nano-titanium dioxide P25 has low charge and discharge capacity and average rate performance, which has affected its development in power lithium-ion batteries.

Method used

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  • Novel titanium dioxide cathode material of power lithium ion cell and preparation method thereof
  • Novel titanium dioxide cathode material of power lithium ion cell and preparation method thereof
  • Novel titanium dioxide cathode material of power lithium ion cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 0.58g P123 (EO 20 PO 70 EO 20 ), 7g of absolute ethanol, 0.45g of oxalic acid, 7.30g of hydrochloric acid, and water were mixed with magnetic stirring for 30 minutes, and then 4.5g of tetra-n-butyl titanate was added dropwise to the mixed solution, and magnetically stirred for 1 hour.

[0028] (2) Add 4 g of polystyrene pellets synthesized by emulsifier-free polymerization into the above solution and stir magnetically for 2.5 hours, then centrifuge once to remove excess solution, and bake for 4 hours under vacuum at 60°C to obtain a new type of layered mesoporous Titanium dioxide precursor.

[0029] (3) The layered mesoporous titania precursor was calcined at 250°C for 2 hours, 350°C for 2 hours, and 500°C for 2 hours in an air atmosphere in a muffle furnace, with a heating rate of 2°C / min to obtain a layered Mesoporous titanium dioxide anode material.

Embodiment 2

[0031] (1) 0.2901g P123 (EO 20 PO 70 EO 20 ), 6g of absolute ethanol, 0.3g of oxalic acid, 7.30g of hydrochloric acid, and water were mixed with magnetic stirring for 30 minutes, and then 4.5g of tetra-n-butyl titanate was added dropwise to the mixed solution, and magnetically stirred for 2 hours.

[0032] (2) Add 4 g of polystyrene pellets synthesized by emulsifier-free polymerization into the above solution and stir magnetically for 2.5 hours, then centrifuge once to remove excess solution, and bake for 4 hours under vacuum at 70°C to obtain a new type of layered mesoporous Titanium dioxide precursor.

[0033] (3) The layered mesoporous titania precursor was calcined at 250°C for 2 hours, 300°C for 2 hours, and 500°C for 2 hours in an air atmosphere in a muffle furnace, and the heating rate was 2°C / min to obtain a layered Mesoporous titanium dioxide.

Embodiment 3

[0035] (1) 0.5801g P123 (EO 20 PO 70 EO 20 ), 7g of absolute ethanol, 0.6g of oxalic acid, 8g of hydrochloric acid, and water were mixed with magnetic stirring for 30 minutes, and then 3g of tetra-n-butyl titanate was added dropwise to the mixed solution, and magnetically stirred for 1 hour.

[0036] (2) Add 2 g of polystyrene pellets synthesized by emulsifier-free polymerization into the above solution and stir magnetically for 3 hours, then centrifuge twice to remove excess solution, and bake under vacuum at 60°C for 4 hours to obtain a new type of layered medium Porous titania precursor.

[0037] (3) The layered mesoporous titania precursor was calcined at 250°C for 3 hours, 350°C for 3 hours, and 550°C for 3 hours in an air atmosphere in a muffle furnace, with a heating rate of 3°C / min to obtain a layered Mesoporous titanium dioxide.

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Abstract

The invention discloses a novel titanium dioxide cathode material of a power lithium ion cell and a preparation method thereof. By using the method, anatase type laminated mesoporous titanium dioxide is formed through selective surface adsorption of acetic acid, centrifugal sedimentation and high temperature calcination under the action of double templates of a surfactant P123 and polystyrene. The laminated mesoporous titanium dioxide prepared by the method has higher charge / discharge capacity, multiplying power and circulation performance.

Description

technical field [0001] The invention relates to the field of power lithium ion batteries, in particular to a novel titanium dioxide negative electrode material for power lithium ion batteries and a preparation method thereof. Background technique [0002] At present, pure electric vehicles and hybrid electric vehicles are attracting more and more attention, among which lithium-ion batteries are the most ideal power source. Graphite, as the current commercial lithium-ion battery anode material, is cheap, thermally stable, and environmentally friendly. However, due to the relatively low lithium intercalation potential of graphite, it is easy to cause the electrolyte to decompose, causing a series of safety issues. Because titanium dioxide has a high lithium intercalation potential, it avoids the decomposition of the electrolyte, which can improve the safety of lithium-ion batteries. At the same time, the structure of titanium dioxide is stable, and there is no structural colla...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/131
CPCY02E60/122Y02E60/10
Inventor 易金李伟善郝连升陈朗李斌
Owner SOUTH CHINA NORMAL UNIVERSITY
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