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Niobium-doped lithium titanate material, preparation method thereof and lithium battery

A lithium titanate, slurry technology, applied in titanate, secondary batteries, battery electrodes, etc., can solve the problems of poor low temperature cycle performance, improve low temperature cycle performance, increase wetting area, and enrich pore structure. Effect

Pending Publication Date: 2021-05-04
NORTHERN ALTAIR NANOTECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a niobium-doped lithium titanate material, its preparation method and lithium battery, to solve the problem of poor low-temperature cycle performance of lithium titanate batteries in the prior art

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  • Niobium-doped lithium titanate material, preparation method thereof and lithium battery
  • Niobium-doped lithium titanate material, preparation method thereof and lithium battery
  • Niobium-doped lithium titanate material, preparation method thereof and lithium battery

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preparation example Construction

[0027] In another typical embodiment of the present application, a method for preparing any of the above-mentioned niobium-doped lithium titanate materials is provided, the preparation method comprising: step S1, combining lithium source, titanium source, niobium source Mixing with a solvent to form a mixed slurry; step S2, ultrasonically treating the mixed slurry to obtain a dispersed slurry; step S3, wet grinding the dispersed slurry to obtain a wet-milled slurry; step S4, performing Spray drying to obtain microspheres; step S5, roasting the microspheres in an oxygen-containing atmosphere to obtain a lithium titanate material, wherein the lithium source is lithium hydroxide, the titanium source is titanium dioxide or titanium hydroxide, and the niobium source is five Niobium oxide is roasted at a temperature of 600-900°C for 3-12 hours.

[0028] Weigh each lithium source, titanium source, and niobium source according to the set ratio, and mix the raw materials of each elemen...

Embodiment 1

[0042] Preparation of Nb element doped lithium titanate:

[0043] Weigh lithium hydroxide, titanium dioxide and niobium pentoxide according to the molar ratio of lithium, titanium and niobium 4:4.95:0.05; mix lithium hydroxide, titanium dioxide and deionized water, stir for 0.5h, then add niobium pentoxide, stir for 0.5 ~1h, make mixed slurry, the solid content of mixed slurry is 20%; This mixed slurry utilizes the ultrasonic power of 0.6kw to process 40min, obtains dispersed slurry; This dispersed slurry is wetted on ball mill The grinding ball is zirconium ball, the filling rate of wet grinding is 70-80%, the rotating speed is 3000r / min, the pressure is 1.0bar, the grinding time is 5h, and the wet grinding slurry is obtained. The solid particle size in the wet grinding slurry is Between 30-70nm; the prepared wet grinding slurry is exported and placed in a stirrer for half an hour. The wet grinding slurry that has been placed is subjected to a spray drying process. The condi...

Embodiment 2

[0045] Preparation of Nb element doped lithium titanate:

[0046] Weigh lithium hydroxide, titanium dioxide and niobium pentoxide according to the molar ratio of lithium, titanium and niobium 4:4.85:0.15; mix lithium hydroxide, titanium dioxide and deionized water, stir for 0.5h, then add niobium pentoxide, stir for 0.5 ~1h, make mixed slurry, the solid content of mixed slurry is 20%; This mixed slurry utilizes the ultrasonic power of 0.6kw to process 40min, obtains dispersed slurry; This dispersed slurry is wetted on ball mill The grinding ball is zirconium ball, the filling rate of wet grinding is 70-80%, the rotating speed is 3000r / min, the pressure is 1.0bar, the grinding time is 5h, and the wet grinding slurry is obtained. The solid particle size in the wet grinding slurry is Between 30-70nm; the prepared wet grinding slurry is exported and placed in a stirrer for half an hour. The wet grinding slurry that has been placed is subjected to a spray drying process. The condi...

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Abstract

The invention provides a niobium-doped lithium titanate material, a preparation method thereof and a lithium battery. The niobium-doped lithium titanate material has the following structural general formula: Li4Ti(5-x)NbxO12, wherein 0<x<=0.2, D50 of the niobium-doped lithium titanate material is 7-11 microns, and BET specific surface area of the lithium titanate material is 3.0-5.3 m<2> / g. The niobium-doped lithium titanate material has a rich pore structure, the migration distance of lithium ions in the material is effectively shortened, and the diffusion impedance is reduced. The porous lithium titanate material with relatively large specific surface area increases the infiltration area of an electrolyte, so that more de-intercalation sites are provided for lithium ions, polarization is reduced, the diffusion rate of the lithium ions is improved, the specific capacity, the energy density and the rate capability of the lithium ion battery are further improved, and the low temperature resistance of the lithium ion battery is further improved.

Description

technical field [0001] The invention relates to the technical field of lithium titanate materials, in particular to a niobium-doped lithium titanate material, a preparation method thereof and a lithium battery. Background technique [0002] Because lithium titanate batteries have many advantages such as fast charge and discharge, high safety, wide temperature resistance, and long cycle life, but the current lithium titanate material technology has disadvantages such as low capacity, low energy density, and high cost. The commercial application of lithium titanate materials is limited. At present, we are actively researching ways to increase the gram capacity of lithium titanate materials, so as to make up for the relatively low energy density of lithium titanate batteries and improve the battery life of lithium titanate batteries. [0003] At present, the electrical properties of lithium titanate batteries are provided through the following three aspects: preparation of nan...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/58H01M10/0525C01G23/00
CPCC01G23/005H01M4/485H01M4/5825H01M10/0525Y02E60/10
Inventor 王荣荣李倩倩邢红霞成信刚
Owner NORTHERN ALTAIR NANOTECH CO LTD
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