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A modified n, p co-doped lithium titanate negative electrode material and preparation method thereof

A negative electrode material and co-doping technology, applied in the field of modified N, can solve the problems of low conductivity, low theoretical capacity, low lithium ion diffusion rate, etc., and achieve the effect of high conductivity, uniform particle size and uniform dispersion

Active Publication Date: 2022-03-29
JIANGSU AOXIN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the relatively low lithium ion diffusion rate, low electrical conductivity, and low theoretical capacity all restrict Li 4 Ti 5 o 12 wider application

Method used

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  • A modified n, p co-doped lithium titanate negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 0.00405mol LiOH·H 2 O and 0.005mol anatase TiO 2 respectively dissolved in the ball milling condition and mixed uniformly to obtain the precursor. Then the precursor was mixed with anhydrous sodium hypophosphite (NaH 2 PO 2 ) according to the mass ratio of 1:10 placed at both ends of the porcelain boat, wrapped with aluminum foil and placed in a tube furnace, NaH 2 PO 2 Located upstream, in NH 3 and N 2 The mixed gas (volume ratio of the two is 5:95) was heated to 800°C and kept for 12 hours to obtain nitrogen and phosphorus co-doped lithium titanate material.

[0028] A mixture of 1.0g of petroleum pitch, 25g of NaCl and nano-ZnO in a mass ratio of 5:1, a mixture of 25mL of toluene and absolute ethanol in a volume ratio of 6:1 and 0.1g of nitrogen and phosphorus were co-doped with titanic acid Lithium particles were added into a 100mL round bottom flask, ultrasonically dispersed for 0.8h, then magnetically stirred for 22h, and toluene and absolute ethanol were r...

Embodiment 2

[0030] 0.00405mol LiOH·H 2 O and 0.005mol anatase TiO 2 respectively dissolved in the ball milling condition and mixed uniformly to obtain the precursor. Then the precursor was mixed with anhydrous sodium hypophosphite (NaH 2 PO 2 ) according to the mass ratio of 1:10 placed at both ends of the porcelain boat, wrapped with aluminum foil and placed in a tube furnace, NaH 2 PO 2 Located upstream, in NH 3 and N 2 The mixed gas (volume ratio of the two is 5:95) was heated to 800°C and kept for 12 hours to obtain nitrogen and phosphorus co-doped lithium titanate material.

[0031] A mixture of 1.0g of petroleum pitch, 25g of NaCl and nano-ZnO in a mass ratio of 5:1, a mixture of 25mL of toluene and absolute ethanol in a volume ratio of 6:1 and 0.1g of nitrogen and phosphorus were co-doped with titanic acid Lithium particles were added into a 100mL round-bottomed flask, ultrasonically dispersed for 0.5h, then magnetically stirred for 20h, and toluene and absolute ethanol were...

Embodiment 3

[0033] 0.00405mol LiOH·H 2 O and 0.005mol anatase TiO 2 respectively dissolved in the ball milling condition and mixed uniformly to obtain the precursor. Then the precursor was mixed with anhydrous sodium hypophosphite (NaH 2 PO 2 ) according to the mass ratio of 1:10 placed at both ends of the porcelain boat, wrapped with aluminum foil and placed in a tube furnace, NaH 2 PO 2 Located upstream, in NH 3 and N 2 The mixed gas (volume ratio of the two is 5:95) was heated to 800°C and kept for 12 hours to obtain nitrogen and phosphorus co-doped lithium titanate material.

[0034] A mixture of 1.0g of petroleum pitch, 25g of NaCl and nano-ZnO in a mass ratio of 5:1, a mixture of 25mL of toluene and absolute ethanol in a volume ratio of 6:1 and 0.1g of nitrogen and phosphorus were co-doped with titanic acid Lithium particles were added into a 100mL round-bottom flask, ultrasonically dispersed for 1h, then magnetically stirred for 24h, and toluene and absolute ethanol were rem...

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Abstract

The invention provides a modified N, P co-doped lithium titanate negative electrode material and a preparation method thereof, and specifically relates to the technical field of lithium ion battery negative electrode materials. 2 O and anatase are mixed to obtain a precursor. Put the precursor and anhydrous sodium hypophosphite in a tube furnace and feed NH 3 and N 2 The mixed gas is heated to 800°C to obtain a nitrogen and phosphorus co-doped lithium titanate material. Add petroleum pitch, inorganic substances, organic solvents, and nitrogen-phosphorus co-doped lithium titanate particles into a 100 mL round-bottomed flask, mix well, and remove the organic solvent by rotary evaporation. The mixture after removing the organic solvent was moved into a tube furnace, and passed through H 2 Mix gas with Ar and raise the temperature to 800-850°C and keep the temperature constant for 1h, then cool down to 400°C and keep the temperature for 1h. After cooling down to room temperature, use 1 mol / L hydrochloric acid to remove the inorganic substances in the mixture, centrifuge and wash, and then vacuum-dry for 12 hours to obtain the product. The invention can ensure uniform and dense dispersion of the entire composite material, thereby maintaining the stability and high conductivity of the electrode structure.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a modified N, P co-doped lithium titanate negative electrode material and a preparation method thereof. Background technique [0002] Traditional fossil energy is facing the crisis of shortage or even depletion, and it has brought huge pressure to environmental protection. The new industrialization development direction of circular economy and low-carbon economy will promote the rapid development of new energy automobile industry. As a new generation of environmentally friendly and high-energy batteries, lithium-ion power batteries have become the mainstream product of power batteries for new energy vehicles. Although the protection circuit of lithium-ion batteries is relatively mature, for power batteries, the selection of negative electrode materials is very critical to truly ensure safety. At present, most of the nega...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/583H01M4/62H01M10/0525H01M10/42
CPCH01M4/485H01M10/0525H01M10/4235H01M4/362H01M4/625H01M4/583Y02E60/10
Inventor 伊廷锋戴德兵张文泉李忠明戴长松付定华
Owner JIANGSU AOXIN TECH DEV
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