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Preparation method of doped Li4Ti5O12 anode material

A negative electrode material, lithium titanate technology, applied in the field of preparation of doped lithium titanate negative electrode materials, can solve the problems of rapid specific capacity decay, poor conductivity of lithium titanate, etc., to make up for the lack of electrical conductivity, low price, source rich effect

Inactive Publication Date: 2015-07-29
田东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of lithium titanate is poor, and the specific capacity decays rapidly in a high-rate environment. Doping coating is the most effective means to improve its performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing a negative electrode material doped with lithium titanate, the steps are as follows: add lithium hydroxide, nano titanium dioxide, silicon dioxide, and glucose into a ball mill, and use absolute ethanol as a medium for ball milling for 10 hours, wherein lithium hydroxide and nano The mass ratio of titanium dioxide is 1:1, and the mass of silicon dioxide and glucose are respectively 2.5% and 3% of the sum of the mass of lithium hydroxide and nano titanium dioxide. The slurry obtained after ball milling is spray-dried to obtain a powder mixture material. The obtained powder mixture was calcined in a nitrogen atmosphere from room temperature to 800°C at a rate of 10°C / min, and kept for 3 hours. After cooling, the primary product of lithium titanate composite material was obtained. The initial product is ball milled in a ball mill for 3 hours, and after passing through a 200-mesh sieve, the doped lithium titanate negative electrode material prepared b...

Embodiment 2

[0024] A method for preparing a doped lithium titanate negative electrode material, the steps are as follows: add lithium hydroxide, nano titanium dioxide, silicon dioxide, and glucose into a ball mill, and use absolute ethanol as a medium for ball milling for 8 hours, wherein lithium hydroxide and nano The mass ratio of titanium dioxide is 1:1, and the mass of silicon dioxide and glucose are respectively 5% and 4% of the sum of mass of lithium hydroxide and nano titanium dioxide. The slurry obtained after ball milling is spray-dried to obtain a powder mixture material. The obtained powder mixture was calcined at a rate of 5°C / min from room temperature to 900°C under a nitrogen atmosphere, kept at this temperature for 2 hours, and cooled to obtain the primary product of lithium titanate composite material. The initial product was milled in a ball mill for 4 hours, and passed through a 200-mesh sieve to obtain the doped lithium titanate negative electrode material prepared in t...

Embodiment 3

[0026] A method for preparing a negative electrode material doped with lithium titanate, the steps are as follows: add lithium hydroxide, nano titanium dioxide, silicon dioxide, and glucose into a ball mill, and use absolute ethanol as a medium for ball milling for 10 hours, wherein lithium hydroxide and nano The mass ratio of titanium dioxide is 1:1, and the mass of silicon dioxide and glucose is respectively 10% and 5% of the sum of mass of lithium hydroxide and nano titanium dioxide. The slurry obtained after ball milling is spray-dried to obtain a powder mixture material. The obtained powder mixture was calcined at a rate of 8°C / min from room temperature to 850°C in a nitrogen atmosphere, and kept at a temperature of 3 hours. After cooling, the primary product of lithium titanate composite material was obtained. The initial product was ball milled in a ball mill for 4 hours, and after passing through a 200-mesh sieve, the doped lithium titanate negative electrode material ...

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Abstract

The invention relates to the technical field of preparation of lithium ion battery electrode materials, and particularly discloses a preparation method of a doped Li4Ti5O12 anode material. According to the method, a Li source, nano-silica and glucose in certain material ratio are added to a ball mill and subjected to ball-milling with absolute ethyl alcohol as a medium, then a product is subjected to spray-drying and calcined under the condition of inert atmosphere, and a product is subjected to ball-milling and sieving to obtain the doped Li4Ti5O12 anode material. The doped Li4Ti5O12 anode material shows excellent electrochemical performance when applied to a lithium ion battery anode material. The preparation process is simple, and the prepared anode material has high reversible capacity, high-rate cycle performance and excellent rate charge and discharge performance.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion battery electrode materials, in particular to a preparation method of doped lithium titanate negative electrode materials. Background technique [0002] Lithium-ion batteries, which have been widely used in electronic products such as mobile phones and notebook computers, have large specific energy, high specific power, small self-discharge, good cycle characteristics, fast charging and high efficiency, wide operating temperature range, and no environmental pollution. etc. At present, the lithium-ion batteries used in the market basically use carbon materials as the negative electrode, but there are still some weaknesses that are difficult to overcome in practical applications. For example, the reaction with the electrolyte during the first discharge process forms a surface The passivation film leads to the consumption of the electrolyte and the low initial Coulombic efficiency;...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/62
CPCH01M4/485H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 田东
Owner 田东
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