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Niobate and niobate composite material and application of niobate composite material to secondary lithium battery

A technology for secondary lithium batteries and composite materials, which is used in the field of negative electrodes and batteries, its preparation, niobate and its composite materials, can solve problems such as poor electronic conductivity, and achieve simple process, high safety and wide application. Effect

Active Publication Date: 2015-05-27
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a material with a wide bandgap, the electronic conductance of niobate is not good. In practical applications, niobate electrode materials are required to have high electronic conductance and ionic conductance at the same time, structural stability, and maintaining the gap between electrode materials. Good electrical conductivity between them, stable grain boundaries and small volume deformation, and smooth ion transport

Method used

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  • Niobate and niobate composite material and application of niobate composite material to secondary lithium battery
  • Niobate and niobate composite material and application of niobate composite material to secondary lithium battery
  • Niobate and niobate composite material and application of niobate composite material to secondary lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] According to LiNb 3 o 8 The ratio of each element in the high-purity Li 2 CO 3 Powder and Nb 2 o 5 The powder was diluted with alcohol to form a white paste; dried and cooled, pressed into tablets, heated to 800°C in air at a heating rate of 5°C / min, and kept for 2 hours to obtain a pure sample. figure 1 gives the pure phase LiNb 3 o 8 The XRD diffraction pattern.

Embodiment 2

[0059] According to LiNb 3 o 8 The ratio of each element in the high-purity Li 2 CO 3 Powder and Nb 2 o 5 The powder is diluted with alcohol to form a white paste; after drying and cooling, the tablet is heated to 800°C at a rate of 5°C / min in the air, and kept for 2 hours to obtain the required niobate LiNb 3 o 8 .

[0060] According to LiNb 3 o 8 , acetylene black, and PVDF each accounted for 80%, 10%, and 10% were prepared into electrodes as an electrode of the half-cell, and the counter electrode was made of metal lithium, and 1mol / L LiPF was used 6 / Ethylene carbonate (EC-diethylene carbonate (DEC) (the volume ratio of EC and DEC 1:1) is used as the electrolyte, and the battery is assembled in the glove box and its battery is charged and discharged. The voltage range is 0- 3V, the current density is 20mA / g, see the test results figure 2 .

Embodiment 3

[0062] According to LiNb 3 o 8 The ratio of each element in the high-purity Li 2 CO 3 Powder and Nb 2 o 5 The powder is diluted with alcohol to form a white paste; dried and cooled, pressed into tablets, heated to 800°C at a rate of 5°C / min in the air, and kept for 2 hours to obtain the desired niobate LiNb 3 o 8 . Particles below 100nm can be obtained after 24h high-energy ball milling of the obtained samples. Carry out the charge and discharge test in the same manner as in Example 2. The voltage range is 1-3V, the current density is 20mA / g, the test results are shown in image 3 and Figure 4 .

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Abstract

The invention provides niobate and a niobate composite material and application of the niobate to a secondary lithium battery. The niobate has a general formula of LaMbNbcOd, wherein L is selected from one or more of Li, Na or K; M is selected from one or more of B, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Ce, Y, Zr, Mo, La and Ta; and a, b, c and d stand for molar percentage, wherein a is not less than 0.8 and not more than 1.1, b is not less than 0 and less than 0.2, c is not less than 2.9 and not more than 3.1, and d is not less than 7.8 and not more than 8. The niobate and the niobate composite material which are used as a cathode of the secondary lithium ion battery are high in capacity, can be well circulated, are superior to the lithium titanate material in the market and is a potential material for replacing the lithium titanate.

Description

technical field [0001] The invention relates to niobate and its composite material and its application in secondary lithium batteries, in particular to niobate and its composite material, its preparation method, negative electrode and battery containing the material and composite material. Background technique [0002] Early (Acta Chemica Scandinavica., 25, (1971) 3337; Journal of Crystal Growth.18, (1973) 179-184; Journal of the European Ceramic Society., 26, (2006) 2031-2034) on LiNb 3 o 8 The research focuses on the preparation, structure and application of its materials in ceramics. S.O.Yoon, J.H.Yoon, et al will high-purity Li 2 CO 3 Powder and Nb 2 o 5 After the powder is mixed, it is fired at 700-850°C to obtain LiNb 3 o 8 , then with TiO 2 The dense ceramics can be fired at 1200-1350°C and can be used as ceramic materials. [0003] M.Anji Reddy, published "Facile insertion of lithium into nanocrystalline AlNbO in Chem.Mater. magazine in 2008 4 at room temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/1397H01M4/136H01M10/0525
CPCY02E60/10
Inventor 简泽浪卢侠方铮胡勇胜陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI