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Titanium niobate composite material, preparation method thereof, and cathode and battery containing the same

A composite material, titanium niobate technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as large structural changes, irreversible capacity, and low conductivity

Active Publication Date: 2012-05-30
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the invention is to improve the existing carbon-coated TiNb 2 o 7 As the anode material of secondary lithium battery, the electrical conductivity is not high, the structure change is large or even irreversible and the capacity is continuously lost during the cycle. To provide a highly conductive niobate composite material containing boron carbon or carbon nitrogen or boron carbon nitrogen

Method used

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  • Titanium niobate composite material, preparation method thereof, and cathode and battery containing the same
  • Titanium niobate composite material, preparation method thereof, and cathode and battery containing the same
  • Titanium niobate composite material, preparation method thereof, and cathode and battery containing the same

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Embodiment 1

[0065] According to TiNb 2 o 7 The ratio of each element in the high-purity TiO 2 Powder and Nb 2 o 5 Put the powder and an appropriate amount of alcohol into the mixing tank, then ball mill for 10 hours, dry at 50-70°C, then raise the temperature to 1200-1400°C at a rate of 5°C / min in the air atmosphere, and keep it warm for 24 hours , followed by cooling to room temperature, yielding pure-phase TiNb 2 o 7 sample. figure 1 gives the pure phase TiNb 2 o 7 X-ray diffraction pattern of the sample. Experiments show that: Ti and Nb elements in TiNb 2 o 7 The interoccupancy in will affect its XRD sealing strength ratio, and this interoccupancy is easy to occur in the process of preparing materials.

Embodiment 2

[0067] To the pure phase TiNb that embodiment 1 prepares 2 o 7 Materials do UV-Vis absorption spectrum, the results are as follows figure 2 shown by figure 2 It can be seen that TiNb 2 o 7 The absorption edge of the material is about 420nm, and its bandgap can be obtained by transformation at 2.95eV. Combined with first-principle calculations, it can be known that it is a material with an indirect bandgap, which indicates that it has potential applications in the short-wavelength band of visible light absorption, and can be used as A material that absorbs light, or is used in photovoltaic cells. Simultaneous experiments and calculations demonstrate its potential application in electrochromism.

[0068] The pure phase TiNb prepared by embodiment 1 2 o 7 Materials and Ionic Liquids[EMIm][N(CN) 2 ] After uniform mixing; in a tube furnace, in an argon atmosphere, the resulting mixture is heated from room temperature to between 500 and 700 °C at a rate of 5 °C / min, and ke...

Embodiment 3

[0070] The pure phase TiNb prepared by embodiment 1 2 o 7 The sample was subjected to thermogravimetric differential heat experiment in Ar atmosphere, and the results were as follows: image 3 (a) shown. In the range of 100°C to 600°C, there is an obvious oxygen absorption and release phenomenon, which indicates that TiNb 2 o 7 May be a potential oxygen storage material.

[0071] Composite material C prepared in embodiment 2 0.91 N 0.09 -TiNb 2 o 7 in Ar and O 2 In the thermogravimetric differential heat experiment in a mixed atmosphere, there is an obvious weight loss phenomenon, which is attributed to the oxidation of boron carbon or carbon nitrogen or boron carbon nitrogen compounds, and then detached from the surface, such as image 3 (b) shown.

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Abstract

The invention relates to a titanium niobate composite material, a preparation method thereof, and a cathode and a battery containing the composite material. The titanium niobate composite material is represented as BxCyNz-LaTibMcNbdOe, wherein BxCyNz represents a compound containing boron carbon or carbon nitrogen or boron carbon nitrogen; L represents Li or Na, preferably Li; M is one element selected from Al, B, V, Cr, Mn, Fe, Co, Ni, Ce, Y, Zr, Mo, La, Ta, N and P; x, y, z, a, b, c, d and e represent mole percentages, x is no less than 0 and less than 1, y is larger than 0 and less than 1, z is no less than 0 and less than 1, a is no less than 0 and no larger than 0.2, b is larger than 0.8 and no larger than 1.1, c is no less than 0 and less than 0.2, d is larger than 1.95 and no larger than 2.1, e is no less than 6.8 and no larger than 7, and x and y are not 0 at the same time. The composite material disclosed herein and used as a cathode material of a lithium ion battery has the advantages of high coulombic efficiency, high ionic and electric conductance, good cycling performance of high-rate charge and discharge, high safety, no pollution, and low price.

Description

technical field [0001] The present invention relates to a metal oxide composite material, a preparation method thereof, a negative electrode and a battery containing the composite material, in particular to a titanium niobate composite material containing boron carbon or carbon nitrogen or boron carbon nitrogen compound, and a preparation method thereof And the negative electrode and battery containing the composite material. Background technique [0002] Early (Mater.Chem.Phys., 13(1985) 85-90; J.Solid State Chem.4, 136-142(1981)) on TiNb 2 o 7 Research focused on the preparation of its materials, its own optical properties, reduction products and as electrode materials for photovoltaic cells. L.G.J.De Harrt et al. made high-purity TiO 2 Powder and Nb 2 o 5 After the powder is mixed, it is fired at 1200°C to obtain TiNb 2 o 7 . This is a wide band gap semiconductor material with a band gap of about 3.0eV. The absorption wavelength of ultraviolet and visible light is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/131H01M4/1391H01M10/052
CPCY02E60/122Y02E60/10
Inventor 卢侠简泽浪方铮胡勇胜李泓王兆翔黄学杰陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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