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Carbon-coated titanium sodium phosphate composite material and prepared sodium ion battery

A carbon-coated technology for sodium titanium phosphate and sodium ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as side reactions, poor cycle stability, poor electronic conductivity, etc. Good cycle stability and low cost

Inactive Publication Date: 2019-10-08
北京金羽新能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But pure NaTi 2 (PO 4 ) 3 Poor electronic conductivity, prone to side reactions in aqueous solution, poor cycle stability

Method used

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  • Carbon-coated titanium sodium phosphate composite material and prepared sodium ion battery
  • Carbon-coated titanium sodium phosphate composite material and prepared sodium ion battery
  • Carbon-coated titanium sodium phosphate composite material and prepared sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix sodium dihydrogen phosphate monohydrate, titanium dioxide, and diammonium hydrogen phosphate evenly according to the molar ratio of 1:2:2, add 10% conductive carbon black, use ethanol as the organic solvent, and the mass ratio of ball to material is 10:1. 1000r / min, ball milled for 2 hours, and then dried at 80°C. The obtained material was placed in an atmosphere furnace, first sintered at 400°C for 5 hours at a rate of 5°C / min in an argon atmosphere, then heated to 900°C for 10 hours, and further mechanically crushed to obtain NaTi 2 (PO 4 ) 3 / C Composite.

[0032] NaTi 2 (PO 4 ) 3 The crystal structure of / C composite material is good, and the R3c space structure is well maintained, indicating that the crystal structure of sodium titanium phosphate has not been changed during the coating process. ( figure 1 )

[0033] NaTi 2 (PO 4 ) 3 The main particle size of the / C composite material is 1-3μm and 50-500nm, the crystal form is good, and the distributi...

Embodiment 2

[0036] Mix sodium dihydrogen phosphate dihydrate, titanium dioxide, and ammonium dihydrogen phosphate evenly according to the molar ratio of 1:2:2, add 5% of 1500 mesh graphite, use acetone as the organic solvent, the mass ratio of balls to materials is 50:1, and the speed of the host is 800r / min, ball milled for 5h, and then dried at 80°C. The obtained material was placed in an atmosphere furnace, sintered at 400°C for 5 hours at a rate of 5°C / min in an argon atmosphere, then heated to 900°C for 10 hours, and further mechanically crushed to obtain NaTi 2 (PO 4 ) 3 / C Composite.

[0037] With the NaTi that embodiment 2 prepares 2 (PO 4 ) 3 / C composite material, conductive carbon black and binder PTFE are mixed according to the mass ratio of 80:10:10, slurried with N-methylpyrrolidone, then coated on the treated graphite paper, and dried for 12 hours. Then with 1M NaSO 4 The sodium aqueous solution is used as the electrolyte, and the activated carbon material is used as...

Embodiment 3

[0040] In Example 1, the molar ratio of sodium dihydrogen phosphate monohydrate, titanium dioxide, and diammonium hydrogen phosphate was adjusted to 1:1.7:2, and the rest were the same as in Example 1, and will not be repeated here.

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Abstract

The invention discloses a NaTi2(PO4)3 / C composite material and a preparation method thereof. The composite material is composed of carbon layer-coated NaTi2(PO4)3. In the synthesis method, a titaniumsource, a sodium source and a phosphorus source are used as raw materials and are mixed with a carbon source, a carbon-coated NaTi2(PO4)3 electrode material having excellent properties is synthesizedthrough a solid phase method. The preparation method is uniform in coating, simple in process, high in yield and low in cost. Through the preparation method, the conductivity of NaTi2(PO4)3 is remarkably increased, and as a sodium ion battery, high energy density and good cycle stability are exhibited.

Description

technical field [0001] The invention belongs to the field of new energy materials and energy electrochemistry, and relates to an electrode material, in particular to a carbon-coated NaTi 2 (PO 4 ) 3 Composite materials and solid phase synthesis of NaTi 2 (PO 4 ) 3 / C composite method, and NaTi 2 (PO 4 ) 3 / C as the application of sodium ion electrode material. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, they have been widely used in portable power supplies, power batteries, and aerospace because of their high energy density and low self-discharge effect. The existing lithium-ion batteries all use organic electrolytes, which have potential safety hazards and environmental pollution problems, and cannot be satisfied with applications in large-scale energy storage and other fields. Moreover, the global lithium resource reserves are limited, and the large-scale energy storage applications of lithium-ion batteries are s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/36
CPCH01M4/366H01M4/5825H01M4/625H01M4/628H01M10/36Y02E60/10
Inventor 黄杜斌李爱军田波杨扬姚俊超高雪鑫
Owner 北京金羽新能科技有限公司
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