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Sodium super ionic conductor-inlaid and coated positive electrode material for sodium-ion battery and synthesis method of positive electrode material

A sodium ion battery and ion conductor technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor material storage performance, need to enhance the rate performance, side reactions, etc., to achieve interface stability improvement, sodium ion diffusion The effect of improving ability and simple operation

Active Publication Date: 2017-05-17
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Na x MO 2 There are also the following problems affecting its performance and application
(1)Na x MO 2 The storage performance of the material is poor
Na x MO 2 The residual sodium on the surface of the material is easy to react with the H in the air 2 O or CO 2 The reduction reaction not only reduces the conductivity of the interface, but also leads to excessive viscosity of the material in the subsequent pulping process, which affects the smoothness of the coating
(2)Na x MO 2 The interface stability of the material is not good, and side reactions occur with the electrolyte, which limits the electrochemical performance of the material
(3)Na x MO 2 The sodium ion transport ability of the material is not high, and the rate performance needs to be enhanced

Method used

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  • Sodium super ionic conductor-inlaid and coated positive electrode material for sodium-ion battery and synthesis method of positive electrode material
  • Sodium super ionic conductor-inlaid and coated positive electrode material for sodium-ion battery and synthesis method of positive electrode material
  • Sodium super ionic conductor-inlaid and coated positive electrode material for sodium-ion battery and synthesis method of positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Measure 90ml PEG-400 and place it in a 200ml beaker, place the beaker on a magnetic stirrer and stir, then add the weighed 0.004mol Ti 3 (PO 4 ) 4 , while adding and stirring, after stirring and dispersing for 30min, the weighed 0.3molNaNi 0.5 Mn 0.5 O 2 Add to the above solution, continue to stir for 10min, transfer the solution in the beaker to a 100ml reaction kettle, carry out a solvothermal reaction at 180°C for 12h in a blast drying oven, and after cooling down naturally, place the product in a vacuum drying oven at 180°C. Vacuum drying at 80°C, place the obtained powder in a corundum porcelain boat, transfer the corundum porcelain boat to a muffle furnace, and calcine at 700°C for 8 hours in an air atmosphere. The product obtained is NaTi, a fast ion conductor. 2 (PO 4 ) 3 Mosaic-coated NaNi 0.5 Mn 0.5 O 2 positive electrode material.

[0031] The particle morphologies of the synthesized materials were observed by scanning electron microscopy (e.g. fig...

Embodiment 2

[0033] Measure 90ml of PEG-400 and place it in a 200ml beaker, place the beaker on a magnetic stirrer and stir, then add the weighed 0.002mol Ti (CH 3 COO) 2 ·4H 2 O and 0.006mol NH 4 H 2 PO 4 , while adding and stirring, after stirring and dispersing for 30min, the weighed 0.3mol NaNi 0.5 Mn 0.5 O 2 Add to the above solution, continue to stir for 10min, transfer the solution in the beaker to a 100ml reaction kettle, and carry out a solvothermal reaction at 100°C for 12h in a blast drying oven. After cooling down naturally, the product is placed in a vacuum drying oven at Vacuum drying at 80 °C, the obtained powder is placed in a corundum porcelain boat, the corundum porcelain boat is transferred to a muffle furnace, and the product is calcined at 500 °C for 8 hours in an air atmosphere. NaTi 2 (PO 4 ) 3 Mosaic-coated NaNi 0.5 Mn 0.5 O 2 positive electrode material.

[0034] The particle morphology of the synthesized material was observed by scanning electron mic...

Embodiment 3

[0036] Measure 90ml of PEG-400 and place it in a 200ml beaker, place the beaker on a magnetic stirrer and stir, then add the weighed 0.002mol Ti 3 (PO 4 ) 4 , while adding and stirring, after stirring and dispersing for 30min, the weighed 0.3molNaNi 0.5 Ti 0.5 O 2 Add to the above solution, continue to stir for 10min, transfer the solution in the beaker to a 100ml reaction kettle, carry out a solvothermal reaction at 180°C for 12h in a blast drying oven, and after cooling down naturally, place the product in a vacuum drying oven at 180°C. Vacuum drying at 80°C, place the obtained powder in a corundum porcelain boat, transfer the corundum porcelain boat to a muffle furnace, and calcine it at 700°C for 8 hours in an air atmosphere. The resulting product is an in-situ synthesized sodium fast ion conductor. NaTi 2 (PO 4 ) 3 Mosaic-coated NaNi 0.5 Ti 0.5 O 2 positive electrode material.

[0037] The particle morphology of the synthesized material was observed by scanning...

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Abstract

The invention discloses a sodium super ionic conductor-inlaid and coated positive electrode material for a sodium-ion battery and a synthesis method of the positive electrode material. A sodium residue on the surface of the positive electrode material for the sodium-ion battery is taken as a raw material, and the sodium super ionic conductor-inlaid and coated positive electrode material is synthesized in situ through a solvothermal (hydrothermal)-heat treatment technology, wherein the positive electrode material for the sodium-ion battery is NaxMO2 (x is smaller than or equal to 1 and greater than or equal to 0.67, and M is one or more of transition metals of Ni, Co, Mn, Al, Cr, Fe, Mg, V, Zn, Cu and the like); and a super ionic conductor is NayM2(X)3 (y is smaller than 1.5 and greater than 0.3, M is the metal and X is one of polyanions SiO4<4->, PO4<3->, SO4<2->, MoO4<2-> and the like). The sodium residue on the NaxMO2 interface is directly taken as the raw material of the sodium super ionic conductor, so that the positive electrode material disclosed by the invention has the characteristics of in-situ growth and simplicity in process, the storage property of the obtained positive electrode material for the sodium-ion battery is obviously improved, and the positive electrode material is excellent in electrochemical properties and can be used for a power battery and an energy storage battery.

Description

technical field [0001] The invention relates to the technical field of sodium-ion battery materials, in particular to a mosaic-coated sodium-ion battery cathode material and an in-situ synthesis method thereof. Background technique [0002] In recent years, due to the shortage of lithium resources and insufficient production capacity, the price of battery-grade lithium carbonate has soared from US$5,000 / ton at the end of 2014 to US$20,000 / ton in early 2017. Therefore, it is urgent to find alternative resources and develop new metal ion secondary batteries that meet the needs of future power batteries. Among them, sodium-ion batteries have become a research hotspot in the field of secondary batteries due to the use of sodium, which is cheaper than lithium and rich in resources, with low cost and no over-discharge problem. [0003] The positive electrode material determines the battery type and more than 40% of the material cost, and is an important functional part of the sod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/054
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M4/62H01M10/054Y02E60/10
Inventor 李灵均姚琦杨慧平宋刘斌
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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