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Preparation method and application of NaTi2(PO4)3-TiO2/C composite electrode material

A composite electrode, 3-tio2 technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems that cannot meet the requirements of electrochemical performance, achieve excellent rate performance and cycle performance, easy to control the production process, and low cost Effect

Active Publication Date: 2019-04-09
天津市贝特瑞新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only by surface carbon coating is far from being able to meet the needs of Na-ion batteries for NaTi. 2 (PO4) 3 Electrochemical Performance Requirements at High Rates

Method used

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  • Preparation method and application of NaTi2(PO4)3-TiO2/C composite electrode material
  • Preparation method and application of NaTi2(PO4)3-TiO2/C composite electrode material
  • Preparation method and application of NaTi2(PO4)3-TiO2/C composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Sodium dihydrogen phosphate, titanium dioxide, and ammonium dihydrogen phosphate were mixed according to the molar ratio of Na:Ti:P of 1.04:2:3, and PEG and conductive graphite were added according to 8% and 7% of the total mass of the precursor, and then according to 30% of the total mass of the precursor is added into deionized water for ball milling to disperse to particle size D50=700nm, take out the slurry and dry it with closed spray to obtain the precursor, set the temperature of the air inlet to 245°C, and the temperature of the air outlet to 80°C; in N 2 Pre-fired at 350°C for 2 hours under an atmosphere, and then mixed the pre-fired material with 5% TiO 2 Mix well, and in N 2 Calcined at a constant temperature of 550 °C for 10 h under an atmosphere to obtain the final NaTi 2 (PO4) 3 -TiO 2 / C Composite.

[0030] Preparation and testing of batteries: the prepared NaTi 2 (PO4) 3 -TiO 2The / C composite material is evenly mixed according to the ratio of ac...

Embodiment 2

[0033] Sodium dihydrogen phosphate and titanium dioxide were mixed according to the Na:Ti:P molar ratio of 1.04:2:3, and PEG and conductive graphite were added according to 8% and 7% of the total mass of the precursor, and then according to the total mass of the precursor Add 30% deionized water for ball milling to disperse to particle size D50=750nm, take out the slurry and dry it with closed spray to obtain the precursor, set the temperature at the air inlet to 245°C, and set the temperature at the air outlet to 80°C; 2 Pre-fired at 350°C for 2 hours under an atmosphere, and then mixed the pre-fired material with 8% TiO 2 Mix well, and in N 2 Calcined at a constant temperature of 550 °C for 10 h under an atmosphere to obtain the final NaTi 2 (PO4) 3 -TiO 2 / C Composite.

[0034] The preparation and testing of the battery are the same as in Example 1.

[0035] Test result: adopt the NaTi of present embodiment 2 (PO4) 3 -TiO 2 The / C composite material has a discharge ...

Embodiment 3

[0037] Sodium carbonate, titanium dioxide, and ammonium dihydrogen phosphate were mixed according to the molar ratio of Na:Ti:P of 1.05:2:3, and glucose was added according to 14% of the total mass of the precursor, and then added according to 40% of the total mass of the precursor. Ionized water is ball milled to disperse to a particle size of D50 = 750nm, and the slurry is taken out and dried with a closed spray to obtain a precursor. The temperature at the air inlet is set at 250°C, and the temperature at the air outlet is set at 75°C; 2 Pre-fired at 300°C for 3h under the atmosphere of the pre-fired material and 8% TiO 2 Mix well, and in N 2 Calcined at a constant temperature of 600°C for 9 hours under an atmosphere to obtain the final NaTi 2 (PO4) 3 -TiO 2 / C Composite.

[0038] The preparation and testing of the battery are the same as in Example 1.

[0039] Test result: adopt the NaTi of present embodiment 2 (PO4) 3 -TiO 2 The / C composite material has a dischar...

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Abstract

The invention provides a preparation method of a NaTi2(PO4)3-TiO2 / C composite electrode material. The method comprises the following steps: (1) mixing a sodium source, a titanium source and a phosphorous source, adding a carbon source and solvent to perform ball-milling dispersion, and then performing spray drying on the ball-milled slurry to obtain a spray precursor; (2) pre-sintering the spray precursor obtained in the step (1) for 2-6h at 250-500 DEG C in the inert atmosphere; (3) mixing the material pre-sintered in the step (2) with nanometer titania, and roasting for 6-12h at constant temperature of 500-900 DEG C, thereby obtaining the final NaTi2(PO4)3-TiO2 / C composite electrode material. The prepared NaTi2(PO4)3-TiO2 / C composite electrode material provided by the invention has excellent rate capability and circulating performance, the production process is easy to control, and the cost is low.

Description

technical field [0001] The invention belongs to the field of electrode material synthesis, in particular to a kind of NaTi 2 (PO4) 3 -TiO 2 / C composite electrode material preparation method and application. Background technique [0002] With the extensive application of lithium-ion batteries in the field of electric vehicles, the demand for lithium has greatly increased, and lithium reserves in the earth's crust are limited and unevenly distributed, which will inevitably lead to an increase in the cost of lithium-ion batteries. It is a bottleneck for large-scale energy storage batteries of renewable resources. Sodium and lithium have similar physical and chemical properties, and are abundant and widely distributed in the earth's crust. Sodium-ion batteries are considered to be one of the new secondary batteries that are most likely to replace lithium-ion batteries. Since the electrode potential of sodium (-2.7V) is 0.3V higher than that of lithium (-3.04V), and the radi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/62H01M4/625H01M10/054Y02E60/10
Inventor 赵钰萌席小兵孟少敏杨才德黄友元
Owner 天津市贝特瑞新能源科技有限公司