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Hexagonal prism-shaped titanium niobate negative electrode material and preparation method thereof

A negative electrode material, titanium niobate technology, applied in chemical instruments and methods, niobium compounds, battery electrodes, etc., can solve the problems of loss of material performance improvement effect, loss of core-shell structure characteristics, high cost of preparation process, etc., to improve electronic Effects of conductivity and ion diffusion rate, enhanced rate performance, and high power performance

Active Publication Date: 2020-10-02
骆驼集团武汉光谷研发中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the core-shell structure of the invention is easily broken during the electrode rolling and tableting stage of the battery, thus losing the core-shell structure characteristics and the effect of improving material properties, and the preparation process is expensive, and the organic system is used, which poses a safety hazard Big

Method used

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  • Hexagonal prism-shaped titanium niobate negative electrode material and preparation method thereof
  • Hexagonal prism-shaped titanium niobate negative electrode material and preparation method thereof
  • Hexagonal prism-shaped titanium niobate negative electrode material and preparation method thereof

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Effect test

Embodiment 1

[0031] First weigh 79.9g of titanium dioxide, 245.871g of niobium pentoxide, 13.65g of vanadium pentoxide, 16.97g of sucrose and 3.39g of sodium dodecylbenzenesulfonate, and disperse the above raw materials in 840g of deionized water , made into a suspension with a solid content of 30%; then the above suspension was added to the reaction kettle, heated to 200°C for 15 hours under airtight conditions, after the reaction was completed and cooled to room temperature, washed, filtered and dried to obtain titanium niobate Body powder; then the obtained titanium niobate precursor powder is roasted at a high temperature for 8 hours under the protection of nitrogen atmosphere, the roasting temperature is 600°C, and then cooled to room temperature to obtain a hexagonal prism-shaped titanium niobate negative electrode material, whose molecular formula is TiNb 1.85 V 0.15 o 7 / C.

Embodiment 2

[0035] First weigh 340.32g of tetrabutyl titanate, 537.644g of niobium chloride, 0.4g of magnesium oxide, 87.84g of glucose and 43.92g of triton, and disperse the above raw materials in 1515g of deionized water to form a solid Suspension with a content of 40%; then add the above suspension into a reaction kettle, heat to 150°C under airtight conditions and react for 5 hours, after the reaction is completed and cooled to room temperature, wash, filter and dry to obtain titanium niobate precursor powder; Then, the obtained titanium niobate precursor powder was roasted at a high temperature for 5 hours under the protection of nitrogen atmosphere, the roasting temperature was 800°C, and then cooled to room temperature to obtain a hexagonal prism-shaped titanium niobate negative electrode material, whose molecular formula was TiNb 1.99 Mg 0.01 o 7 / C.

Embodiment 3

[0037] First weigh 120g of titanic acid, 212.34g of niobium dioxide, 15.294g of aluminum oxide, 52.14g of polysaccharide and 34.76g of triton, and disperse the above raw materials in 1738g of deionized water to form a solid Suspension with a content of 20%; then add the above suspension into a reaction kettle, heat to 250° C. for 10 h under airtight conditions, and after the reaction is completed and cool to room temperature, wash, filter and dry to obtain titanium niobate precursor powder; Then, the obtained titanium niobate precursor powder was roasted at a high temperature for 2 hours under the protection of nitrogen atmosphere, the roasting temperature was 1000°C, and then cooled to room temperature to obtain a hexagonal prism-shaped titanium niobate negative electrode material, whose molecular formula was TiNb 1.7 al 0.3 o 7 / C.

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a hexagonal prism-shaped titanium niobate negative electrode material and a preparation method thereof. According tothe hexagonal prism-shaped titanium niobate negative electrode material and the preparation method thereof, a titanium niobate precursor is prepared through a hydrothermal method from a mixed suspension of a titanium source compound, a niobium source compound, a doped element M compound, a carbon source compound and a surfactant, and the particle morphology is a hexagonal prism; and then, the precursor is subjected to high-temperature roasting under the protection of nitrogen atmosphere to obtain the hexagonal prism-shaped titanium niobate negative electrode material. The hexagonal prism-shaped titanium niobate negative electrode material prepared by the preparation method disclosed by the invention discharges at a rate of 20C, the capacity retention ratio is 80%, the capacity retention ratio is 100% after 50 cycles at a high temperature of 45 DEG C, and the hexagonal prism-shaped single crystal particle morphology enables the material to have higher compaction density (greater than or equal to 3.0 g / cm<3>).

Description

technical field [0001] The invention relates to the technical field of lithium battery electrode materials and preparation thereof, in particular to a hexagonal prism-shaped titanium niobate negative electrode material and a preparation method thereof. Background technique [0002] In recent years, with the strong support of national and local governments, the demand for electric vehicles has been growing. Battery safety, fast charging capability, and battery life are key factors that determine the development of power batteries. [0003] Traditional lithium-ion batteries all use carbon-based negative electrode materials, which have the advantages of high reversible capacity (theoretical 372mAh / g) and low charge and discharge voltage, and are currently found to have better comprehensive electrochemical performance. However, when the carbon-based negative electrode material is overcharged or charged with a large current, it is easy to cause the deposition of lithium dendrite...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/58H01M10/0525C01G33/00
CPCC01G33/00H01M4/485H01M4/5825H01M10/0525Y02E60/10
Inventor 陈立鹏陈念黄兴
Owner 骆驼集团武汉光谷研发中心有限公司
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