Sodium-ion battery oxide cathode material, and preparation method and application thereof

A sodium-ion battery and positive electrode material technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of no performance, inability to provide high-voltage area capacity, and inability to perform stably

Active Publication Date: 2016-09-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A series of O3-type NaLi synthesized by Jing Xu et al. x Ni 1 / 3-x mn 1 / 3+x co 1 / 3-x o 2 (x=0.07,0.13,and0.2) has a good cycle retention rate, and a charge-discharge plateau higher than 4V was generated during the first charge-discharge, but the plateau disappeared from the second cycle , also cannot provide the capacity of the high voltage area
In addition, there are single-element or multi-element substitutions of Li and Ni, Cu, Ti, Co, etc., although the modified material is better than Na x MnO 2 It has a certain effect in terms of electrochemical and structural stability, but the material does not show or cannot stably show an obvious charge-discharge voltage platform above 4V during the charge-discharge process

Method used

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  • Sodium-ion battery oxide cathode material, and preparation method and application thereof
  • Sodium-ion battery oxide cathode material, and preparation method and application thereof
  • Sodium-ion battery oxide cathode material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Will Li 2 CO 3 , Na 2 CO 3 ,MnO 2 Mix evenly at a molar ratio of 1:3:8, then grind evenly in an agate mortar, heat up to 600°C in a muffle furnace at a rate of 2°C / min and keep it for 24 hours, then cool with the furnace to obtain Li 0.25 Na 0.75 MnO 2 . Particle size is 5-20um, spherical particles (such as figure 1 ), XRD shows that the material is an obvious layered structure ( figure 2 ). After mixing the material with acetylene black and polyvinylidene fluoride (PVDF) at a ratio of 8:1:1, add the organic solvent N-methylpyrrolidone (NMP) as a dispersant, and coat the material evenly on the aluminum foil Then put it into an oven at 120°C and bake for 6-12 hours, then punch it into a positive electrode piece with a diameter of 14mm. Use metal sodium sheet as the negative electrode, whatman GF / D as the diaphragm, and 1mol / L NaClO 4 PC: DMC: FEC = 49: 49: 2v% is the electrolyte, and the battery is installed in a glove box filled with high-purity argon gas wi...

Embodiment 2

[0031] Will Li 2 CO 3 , Na 2 CO 3 ,MnO 2 After mixing evenly at a molar ratio of 1:2:3 and ball milling evenly, raise the temperature in a muffle furnace to 800°C at a heating rate of 2°C / min and keep it for 24 hours, then cool with the furnace to obtain Li 1 / 3 Na 2 / 3 MnO 2 . The battery was assembled according to the method of Example 1, and the charging and discharging test was carried out. The results show that the synthesized material has a reversible charge-discharge voltage platform above 4V when it is charged and discharged for the first time like Example 1, and the platform is higher than that of Li 0.25 Na 0.75 MnO 2 Slightly longer, and gradually shortened with the cycle plateau voltage.

Embodiment 3

[0033] Will Li 2 CO 3 , Na 2 CO 3 ,MnO 2 , Fe 2 o 3 After mixing evenly at a molar ratio of 1:4:9:0.5 and ball milling evenly, heat up to 750°C in a muffle furnace at a rate of 2°C / min and keep it for 24 hours, then cool with the furnace to obtain Li 0.2 Na 0.8 mn 0.9 Fe 0.1 o 2 . The battery was assembled according to the method of Example 1, and the charging and discharging test was carried out. The result is as Figure 5 : Compared with the voltage curve of Example 1, the synthesized material does not change much when it is first charged, but the plateau changes slightly with cycles.

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Abstract

The invention discloses a sodium-ion battery cathode material, and a preparation method and application thereof. The molecular formula of a lithium-sodium-manganese oxide is Li<x>Na<y>M<z>Mn<1-z>O<2>, wherein x is greater than 0.15 and less than 0.5; y is greater than 0.5 and less than 0.9; z is greater than or equal to 0 and less than 0.5; and M is one or more selected from Fe, Ti, Ni, Mg, Cr, Co, Cu and the like. The preparation method of the material comprises the following steps of after sufficiently mixing and uniformly grinding a manganese source, a sodium source and a lithium source or a manganese source, a sodium source, a lithium source and a M source (M is selected from Fe, Ti, Ni, Mg, Cr, Co and Cu), sintering at 400-1100 DEG C for 4-48 h, and naturally cooling the material to 25-120 DEG C so as to obtain the final product. The cathode material disclosed by the invention can provide reversible charging and discharging voltage above 4V; required raw materials are wide in source; and the preparation method is simple.

Description

technical field [0001] The invention relates to the field of electrode materials for sodium ion batteries, in particular to a lithium sodium manganese oxide used as a positive electrode material for sodium ion batteries and its preparation method and application. Background technique [0002] Since Japan's Sony Corporation took the lead in realizing the commercialization of lithium-ion batteries in the world in the 1990s, lithium-ion batteries have many advantages such as high energy density, high charge and discharge voltage, high energy conversion efficiency, no self-discharge and no memory effect. Portable mobile devices and other aspects occupy an absolute market share. With the deepening of the global energy crisis and the aggravation of environmental problems, governments and automobile companies of various countries regard energy conservation and emission reduction as the main direction of automobile development, and lithium-ion batteries have become the first choice ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M10/054
CPCH01M4/362H01M4/505H01M10/054Y02E60/10
Inventor 杜柯胡国荣彭忠东朱金友
Owner CENT SOUTH UNIV
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