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A kind of preparation method of sodium lithium titanate negative electrode material with hierarchical structure

A negative electrode material, sodium lithium titanate technology, applied in structural parts, battery electrodes, electrical components, etc., can solve the problems of poor capacity performance, poor conductivity and limitations of sodium lithium titanate, and achieve stable cycle life and good dispersion , the effect of uniform particles

Active Publication Date: 2020-02-14
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor conductivity of sodium lithium titanate and the poor capacity performance under high current, its practical application is limited.

Method used

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  • A kind of preparation method of sodium lithium titanate negative electrode material with hierarchical structure
  • A kind of preparation method of sodium lithium titanate negative electrode material with hierarchical structure

Examples

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Embodiment 1

[0017] Put 0.05mol lithium nitrate and 0.05mol aluminum nitrate in a ball mill, use acetone as dispersant, ball mill for 4h, then place in a muffle furnace and bake at 750°C for 18h, after cooling to room temperature, pass through a fine sieve to obtain γ-LiAlO 2 powder. Dissolve 0.06mol tetrabutyl titanate, 0.02mol lithium acetate and 0.02mol sodium nitrate in a mixed solution of ethanol, ethylene glycol and glycerol, the volume ratio is 5:3:1, add citric acid as a chelating agent, of which lemon The molar ratio of acid to metal cation is 1.3:1, then add 24 grams of N,N-acrylamide and acrylamide mixture (the mass ratio of the two is 1:5), and stir in a constant temperature water bath at 80°C To form a gel, then place the gel at room temperature for 12 hours, then put the gel in a vacuum oven at 160°C and dry it for 24 hours to obtain a precursor; then 0.1713 grams of γ-LiAlO 2 The powder is mixed with the precursor, the precursor is ball milled for 4 hours, put into a muffle...

Embodiment 2

[0019] Put 0.05mol lithium nitrate and 0.05mol aluminum nitrate in a ball mill, use acetone as dispersant, ball mill for 4h, then place in a muffle furnace and bake at 750°C for 18h, after cooling to room temperature, pass through a fine sieve to obtain γ-LiAlO 2 powder. Dissolve 0.06mol tetrabutyl titanate, 0.02mol lithium acetate and 0.02mol sodium nitrate in a mixed solution of ethanol, ethylene glycol and glycerol, the volume ratio is 5:3:1, add citric acid as a chelating agent, of which lemon The molar ratio of acid to metal cation is 1.3:1, then add 24 grams of N,N-acrylamide and acrylamide mixture (the mass ratio of the two is 1:5), stir in a constant temperature water bath at 70°C To form a gel, then place the gel at room temperature for 10 hours, then put the gel in a vacuum oven at 120°C and dry it for 24 hours to obtain a precursor; then 0.1713 grams of γ-LiAlO 2 The powder is mixed with the precursor, the precursor is ball milled for 4 hours, put into a muffle fur...

Embodiment 3

[0021] Put 0.05mol lithium nitrate and 0.05mol aluminum nitrate in a ball mill, use acetone as dispersant, ball mill for 4h, then place in a muffle furnace and bake at 750°C for 18h, after cooling to room temperature, pass through a fine sieve to obtain γ-LiAlO 2 powder. Dissolve 0.06mol tetrabutyl titanate, 0.02mol lithium acetate and 0.02mol sodium nitrate in a mixed solution of ethanol, ethylene glycol and glycerol, the volume ratio is 5:3:1, add citric acid as a chelating agent, of which lemon The molar ratio of acid to metal cation is 1.3:1, then add 24 grams of N,N-acrylamide and acrylamide mixture (the mass ratio of the two is 1:5), and stir in a constant temperature water bath at 100°C To form a gel, then place the gel at room temperature for 15 hours, then put the gel in a vacuum oven at 180°C and dry it for 24 hours to obtain a precursor; then 0.1713 grams of γ-LiAlO 2 The powder is mixed with the precursor, the precursor is ball milled for 4 hours, put into a muffl...

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Abstract

The invention discloses a preparation method of a lithium sodium titanate negative electrode material with a multistage structure, and belongs to the technical field of lithium ion batteries. The method comprises the following specific steps: dissolving tetrabutyl titanate, lithium acetate and sodium nitrate in an alcohol solution, adding citric acid to serve as a chelating agent, then adding an amine compound, stirring to form gel, and performing vacuum drying; then mixing gamma-LiAlO2 with the dried gel, performing ball milling, performing preheating treatment in the air, then performing ball milling and calcining to obtain a Na2Li2Ti6O14@gamma-LiAlO2 material; putting the Na2Li2Ti6O14@gamma-LiAlO2 material into distilled water, performing ultrasonic treatment and adding sodium dodecyl benzene sulfonate; and pouring a dissolved pyrrole solution into the mixture, stirring, adding an initiator, centrifuging, washing and drying to obtain a target product. The synthesized negative electrode material has the advantages of uniform and consistent particles, high dispersity and high degree of crystallinity; with a stable multistage composite structure, the negative electrode material hasconsiderable wide-potential-window reversible capacity, high rate performance and stable cycle life.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a sodium lithium titanate negative electrode material with a multi-level structure. Background technique: [0002] Lithium-ion batteries are widely used in industrial production, transportation, social life and other fields because of their advantages such as long service life, no memory effect, high energy density, low pollution, and high output voltage. In lithium-ion batteries, graphite-based carbon-based materials are used in the negative electrode materials of consumer industrial lithium battery products in the current market. However, the charge-discharge platform of carbon anode materials is relatively low and close to the reduction potential of lithium metal. During the use of the battery, with continuous charge and discharge, lithium ions are easy to deposit on the carbon anode to form needle-like lithium dendrites, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/48H01M4/36H01M10/0525
CPCH01M4/362H01M4/483H01M4/485H01M10/0525Y02E60/10
Inventor 伊廷锋朱彦荣
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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