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Preparation method of high-tap-density lithium titanate material

A technology of tap density and lithium titanate, applied in the field of preparation of energy materials, can solve the problems of low energy density of batteries, limit the application of lithium titanate, complicated process, etc., achieve cost control, be easy to apply in industrial production, and shorten growth the effect of time

Active Publication Date: 2014-03-26
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, lithium titanate also has shortcomings. The lithium titanate material obtained in the existing research has a low packing density, resulting in low battery energy density, which limits the application of lithium titanate. Therefore, improving the tap density of the material is the main One of the research directions
[0004] Patent CN 201010177934.4 discloses a preparation method of spherical lithium titanate, which can increase the tap density of the material, but this method has special requirements for equipment, and the process is complicated, which significantly increases the production cost

Method used

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Embodiment 1

[0021] Lithium carbonate and anatase titanium dioxide are selected as raw materials, lithium fluoride is used as a flux, and the ratio of Li / Ti (mol%) is 0.80:1, and the content of lithium fluoride is TiO 2 1 wt% of the mass is used for batching, using ethanol as a dispersant, ethanol:solid powder (wt%)=0.7:1, after ball milling on a ball mill for 6 hours, dry in an oven with 21.6% oxygen-containing gas at 40°C Get precursors. The precursor was first treated at 500°C for 2 hours in an atmosphere with an oxygen content of 10%, and then heated to 800°C after cooling, kept for 8 hours in an atmosphere with an oxygen content of 21.6%, and finally cooled to room temperature to obtain Li 4 Ti 5 o 12 sample. The particle size of the obtained material is uniform, and the tap density is 1.20g / cm 3 , and the tap density (0.78g / cm 3 ), the density is significantly increased. A button battery was prepared with a lithium metal sheet as the counter electrode, and the material's 0.1C c...

Embodiment 2

[0023] Lithium nitrate and rutile titanium dioxide are used as raw materials, boric acid is used as flux, and the ratio of Li / Ti (mol%) is 0.82:1, and the content of boric acid is TiO 2 0.5wt% of the mass is used for batching, using ethanol as a dispersant, ethanol:solid powder (wt%)=0.8:1, after ball milling on a ball mill for 6 hours, dry in an oven with 0.1% oxygen-containing gas at 60°C Get precursors. The precursor was first treated at 500°C for 2 hours in an atmosphere with an oxygen content of 0.01%, and then heated to 800°C for 8 hours in an atmosphere with an oxygen content of 99% after cooling, and finally cooled to room temperature to obtain Li 4 Ti 5 o 12 sample. The obtained material particles are smooth and uniform in size, and the tap density is 1.36g / cm 3 , and the tap density (0.80g / cm 3 ), the density is significantly increased. A button battery was prepared with metal lithium sheet as the counter electrode, and the 0.1C charging specific capacity of th...

Embodiment 3

[0025] Lithium hydroxide and anatase titanium dioxide are used as raw materials, and lithium tetraborate is used as a flux. The ratio of Li / Ti (mol%) is 0.84: the content of lithium tetraborate is TiO 2 0.5wt% of the mass is used for batching, methanol is used as a dispersant, methanol: solid powder (wt%) = 1: 1, ball milled on a ball mill for 6 hours, and then dried in an oven with 21.6% oxygen gas at 50°C Get precursors. The precursor was first treated at 500°C for 2 hours in an atmosphere with an oxygen content of 21.6%, and then heated to 800°C for 8 hours in an atmosphere with an oxygen content of 0.1% after cooling, and finally cooled to room temperature to obtain Li 4 Ti 5 o 12 sample. The obtained material particles are smooth and uniform in size, and the tap density is 1.48g / cm 3 , and the tap density (0.82g / cm 3 ), the density is significantly increased. A button battery was prepared with a metal lithium sheet as the counter electrode, and the 0.1C charging spe...

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Abstract

The invention relates to a preparation method of a high-tap-density lithium titanate material, which aims at solving the problem of low density of a lithium titanate material produced by the prior art. The method comprises the steps of ball-milling and mixing a lithium source, a titanium source, a fluxing agent and a dispersing agent in a given ratio, drying the mixture, then pre-sintering at a low temperature, cooling and sintering at a high temperature to form the lithium titanate. The preparation method has the characteristics that the fluxing agent is added in the mixing process, so that particles can be tight in contact in the high-temperature sintering process, the interface tension between each two adjacent particles can be reduced, the growth development of a crystal is complete, and the density of the material can be further improved. The method is simple in technological flow, the raw materials are easily available, the prepared lithium titanate particles are large, the tap density is large, and the electrochemical property is good.

Description

technical field [0001] The invention relates to the field of preparation of energy materials, in particular to a preparation method of lithium titanate, a negative electrode material of a lithium ion battery. Background technique [0002] Due to the advantages of high energy density, long cycle life, and no memory effect, lithium-ion batteries have always been a hot spot in the research and development of batteries. They have been applied in portable appliances, electric vehicles, energy storage and other fields and have good application prospects. At present, commercial lithium-ion battery anode materials generally use carbon anode materials, but because the redox potential of carbon anode materials is very close to the electrode potential of lithium, lithium ions are easily precipitated on the surface of carbon anodes to form lithium dendrites when the battery is overcharged. It may cause a short circuit of the battery and cause safety problems, and the carbon material wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62
CPCY02E60/122C01G23/003H01M4/485H01M4/62H01M10/0525Y02E60/10
Inventor 王兴勤高云李雅楠孙小嫚刘建红吴宁宁
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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