Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Modified lithium titanate material and preparation method thereof

A kind of lithium titanate, lithium titanate technology, applied in the field of preparation of battery electrode materials, can solve the problems of reducing the tap density of materials, reducing the volume energy density, etc., to reduce the reaction temperature, shorten the preparation period and shorten the reaction time. Effect

Inactive Publication Date: 2013-03-20
SHANGHAI NAT ENG RES CENT FORNANOTECH
View PDF6 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although carbon coating can improve the conductivity of electrode materials and improve their electrochemical performance, it reduces the tap density of the material, resulting in a decrease in volumetric energy density.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Modified lithium titanate material and preparation method thereof
  • Modified lithium titanate material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] By means of ultrasonic dispersion, 5.068g of lithium carbonate, 0.033g of manganese dioxide and 0.1864g of lanthanum trioxide were uniformly dispersed in the dispersant of 200mL of water and absolute ethanol, wherein the ratio of water and ethanol was 4:1 (volume ratio); measure 28.8 mL of butyl titanate and add dropwise at a rate of 3 mL / min into the aqueous ethanol solution dispersed with lithium carbonate, manganese dioxide and lanthanum trioxide; The solid powder was obtained after dehydration; the mixed powder was put into a muffle furnace for calcination at 700°C for 5 hours, cooled to room temperature with the furnace, and processed by high-energy ball milling at 400r / min for 5 hours to obtain the final product.

[0020] figure 1 is the XRD pattern of the obtained sample. It can be seen that the position and relative intensity of each diffraction peak in the XRD pattern of the synthesized product are similar to those of Li 4 Ti 5 o 12 The standard cards match...

Embodiment 2

[0022] Uniformly disperse 4.639g of lithium acetate, 0.0218g of hafnium dioxide and 0.0336g of neodymium trioxide into a dispersant of 200mL of water and absolute ethanol by ultrasonic dispersion, wherein the ratio of water and ethanol is 3:1 (volume ratio ); measure 14.7mL of butyl titanate and add dropwise at a rate of 3mL / min into the ethanol aqueous solution dispersed with lithium acetate, hafnium dioxide and neodymium trioxide; Finally, a solid powder was obtained; the mixed powder was put into a muffle furnace for calcination at 750°C for 6 hours, cooled to room temperature with the furnace, and subjected to high-energy ball milling at 400r / min for 4 hours to obtain the final product.

[0023] figure 2 The field emission scanning photo of the obtained sample shows that the particle distribution is relatively concentrated without obvious agglomeration, indicating that this method can prepare Li with a smaller particle size 4 Ti 5 o 12 .

Embodiment 3

[0025] Uniformly disperse 2.573g of lithium carbonate, 0.0169g of vanadium oxide and 0.0115g of manganese dioxide into 200mL of water and absolute ethanol dispersant by ultrasonic dispersion, wherein the ratio of water and ethanol is 3:1 (volume ratio); Measure 14.2mL of butyl titanate and add dropwise at a rate of 3mL / min into the ethanol aqueous solution dispersed with lithium carbonate, vanadium oxide and manganese dioxide; after the dropwise addition, continue ultrasonic dispersion for 30min, and obtain a solid powder after drying, grinding and dehydration ; Put the mixed powder into a muffle furnace for calcination at 800°C for 7 hours, cool down to room temperature with the furnace, and process it through high-energy ball milling at 400r / min for 6h to obtain the final product.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a modified lithium titanate material and a preparation method thereof. The modified lithium titanate material is characterized in that a molecular formula of the lithium titanate material is LiaMpNqTixO12, wherein M and N in the molecular formula are doped and modified metal ions; a is equal to 4; p is more than 0 and less than 0.1; q is more than 0 and less than 0.1; p+q is more than 0 and less than or equal to 0.1; p+q+x is equal to 5; and the metal elements M and N respectively are one of La, Ce, Pr, Nd, Sm, Gd, Dy, Zr, Mn, Ta, Hf and V. The invention further provides a preparation method of the modified lithium titanate material. Compared with the conventional lithium titanate preparation method, the preparation method provided by the invention has the advantages that the reaction temperature is reduced, and the reaction time is reduced. Furthermore, the preparation process is simple; the preparation period is short; and the preparation method is applicable to industrial mass production. Moreover, the modified lithium titanate prepared by the method has the properties of good charging and discharging properties, good circulation property and high-rate property.

Description

technical field [0001] The invention relates to a preparation method of a battery electrode material, in particular to a preparation method of modified lithium titanate for negative electrodes of lithium ion secondary batteries. Background technique [0002] Lithium-ion batteries have the advantages of 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. They have been widely used in mobile phones, notebook computers and other electronic devices. product. At present, the lithium-ion batteries used in the market basically use carbon materials as the negative electrode, but there are still some insurmountable weaknesses in the practical application of carbon materials as the negative electrode. , resulting in lower consumption of electrolyte and lower initial Coulombic efficiency; the potential of the carbon electrode is very close to t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/485C01G23/00
CPCY02E60/122Y02E60/10
Inventor 王丹张春明吴晓燕张遥遥何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com