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Titanium-based composite material with core-shell structure as well as preparation method and application of titanium-based composite material

A technology of titanium-based composite materials and core-shell structure, which is applied in the field of lithium-ion batteries, can solve the problems of inability to guarantee the uniformity of the cladding layer, low diffusion coefficient, and inability to better block the gas production reaction of lithium titanate, and achieve an improvement The effect of first-time charge-discharge efficiency, improved Li+ diffusion coefficient, and excellent first-time charge-discharge efficiency

Pending Publication Date: 2022-04-12
台州闪能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, titanium niobate will form an SEI film on its surface as a negative electrode material, making its first effect low.
In addition, due to the wide band gap (-2.9eV) of titanium niobate, and the Ti 4+ and Nb 5+ All are in the highest valence state, there are no unpaired electrons, resulting in poor conductivity and almost insulation
In addition, Li of titanium niobate + The diffusion coefficient is also low, resulting in a large interface resistance between the titanium niobate anode material and the electrolyte
Due to the above two defects, the electronic conductivity and ionic conductivity of titanium niobate negative electrode materials are low, which limits its electrochemical performance.
[0004] The Chinese patent application document (publication number: CN110311130A) provides a core-shell structure titanium niobate / lithium titanate composite material. The invention mainly processes titanium niobate and lithium titanate through the processes of liquid preparation, coating and drying. Spray mixing can improve the rate performance of titanium niobate negative electrode, but because it is only the mixing between particles, the uniformity of the coating layer cannot be guaranteed, and it cannot better block the gas production reaction of lithium titanate

Method used

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  • Titanium-based composite material with core-shell structure as well as preparation method and application of titanium-based composite material
  • Titanium-based composite material with core-shell structure as well as preparation method and application of titanium-based composite material
  • Titanium-based composite material with core-shell structure as well as preparation method and application of titanium-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] S1. Add 117.3g of anatase-type titanium dioxide and 396g of niobium pentoxide powder into a sand mill, add water to adjust the solid content to 30%, first grind at 500rpm for 1h, and then grind at a speed of not less than 13m / s Continue to grind for 5 hours, then transfer the grinding slurry and carry out spray drying treatment. The temperature of the spray inlet is 230°C, and the temperature of the outlet is 100°C to obtain a titanium niobate precursor with a median particle size of 3 μm. Then the mixed The titanium niobate precursor was placed in a high-temperature muffle furnace, and after a solid-state reaction at 900°C for 10 hours, titanium niobate particles with a median particle size of 3 μm were finally obtained;

[0051] S2. Dissolve 182.4g cetyltrimethylammonium bromide (CTAB) in 3335.5mL ethylene glycol solution, then add 300.0g titanium niobate particles, stir mechanically at 800rpm for 1h, then add 1111.8mL titanic acid Tetrabutyl ester, continue to stir a...

Embodiment 2

[0056] S1. Add 117.3g of anatase-type titanium dioxide and 396g of niobium pentoxide powder into a sand mill, add water to adjust the solid content to 30%, first grind at 500rpm for 1h, and then grind at a speed of not less than 13m / s Continue to grind for 5 hours, then transfer the grinding slurry and carry out spray drying treatment. The temperature of the spray inlet is 230°C, and the temperature of the outlet is 100°C to obtain a titanium niobate precursor with a median particle size of 3 μm. Then the mixed The titanium niobate precursor was placed in a high-temperature muffle furnace, and after a solid-state reaction at 900°C for 10 hours, titanium niobate particles with a median particle size of 3 μm were finally obtained;

[0057] S2. Dissolve 153.1g cetyltrimethylammonium bromide (CTAB) in 2223.7mL ethylene glycol solution, then add 300.0g titanium niobate particles, mechanically stir at 800rpm for 1h, then add 741.2mL titanic acid Tetrabutyl ester, continue to stir an...

Embodiment 3

[0062] S1. Add 117.3g of anatase-type titanium dioxide and 396g of niobium pentoxide powder into a sand mill, add water to adjust the solid content to 30%, first grind at 500rpm for 1h, and then grind at a speed of not less than 13m / s Continue to grind for 5 hours, then transfer the grinding slurry and carry out spray drying treatment. The temperature of the spray inlet is 230°C, and the temperature of the outlet is 100°C to obtain a titanium niobate precursor with a median particle size of 3 μm. Then the mixed The titanium niobate precursor was placed in a high-temperature muffle furnace, and after a solid-state reaction at 900°C for 10 hours, titanium niobate particles with a median particle size of 3 μm were finally obtained;

[0063] S2. Dissolve 255.4g cetyltrimethylammonium bromide (CTAB) in 5003.3mL ethylene glycol solution, then add 300.0g titanium niobate particles, mechanically stir at 800rpm for 1h, then add 1667.8mL titanic acid Tetrabutyl ester, continue to stir a...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and relates to a titanium-based composite material with a core-shell structure as well as a preparation method and application of the titanium-based composite material. The formation of an SEI film on the surface of the titanium niobate is effectively inhibited through homogeneous coating of the nano lithium titanate shell on the surface of the titanium niobate, the first charge-discharge efficiency of the titanium niobate negative electrode is improved, the Li < + > diffusion coefficient of the titanium niobate is improved, the interface impedance between an electrode material and an electrolyte is reduced, and the rate performance of the titanium niobate is improved. When the prepared titanium-based composite material with the core-shell structure is applied to a lithium ion battery, excellent first charge-discharge efficiency and good rate and cycle performance can be shown.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a titanium-based composite material with a core-shell structure and a preparation method and application thereof. Background technique [0002] Graphite carbon materials are currently the main anode materials for commercial lithium-ion batteries. However, due to the poor intercalation ability of lithium in traditional graphite anodes, lithium deposits on the surface easily form lithium dendrites, which have a great impact on the cycle performance and safety performance of batteries. influences. Secondly, graphite-based carbon materials have a low lithium ion diffusion coefficient, lithium ions cannot diffuse rapidly during high-current charging and discharging, and the high-rate performance is unsatisfactory, which obviously cannot meet the high-power and high-safety requirements of power for lithium-ion batteries. However, due to the low initial charge-discharge eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M10/0525
CPCY02E60/10
Inventor 焦玉志秦军阮殿波张超郭呈家
Owner 台州闪能科技有限公司
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