Air-stable layered transition metal oxide positive electrode material and sodium ion battery thereof

A transition metal and cathode material technology, applied in the field of electrochemical energy, can solve the problems of harsh electrode fabrication conditions, rapid material capacity decay, irreversible phase transition, etc., and achieve the effects of inhibiting multiphase transformation reactions, high repeatability, and stable structure

Inactive Publication Date: 2020-06-05
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of material has the defects of irreversible phase transition and poor air stability, which lead to rapid material capacity decay, poor cycle stability, and harsh electrode manufacturing conditions, which seriously hinder its application process.

Method used

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  • Air-stable layered transition metal oxide positive electrode material and sodium ion battery thereof
  • Air-stable layered transition metal oxide positive electrode material and sodium ion battery thereof
  • Air-stable layered transition metal oxide positive electrode material and sodium ion battery thereof

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preparation example Construction

[0022] In the second aspect, an embodiment of the present invention provides a method for preparing a layered transition metal oxide positive electrode material. The preparation method used is one of hydroxide co-precipitation, carbonate co-precipitation, and oxalate co-precipitation, specifically include:

[0023] Pump the mixed solution of manganese salt, nickel salt and iron salt and the precipitant solution into the reactor at the same time through the peristaltic pump, control the solution drop rate to 2-10ml / min, the pH value during the reaction is 7.5-11, and the reaction temperature is 40 -80°C, the stirring speed is 500-1000rmp, to obtain a uniform spherical precursor powder; the precipitation agent solution includes one of the hydroxide precipitation solution, the carbonate precipitation solution or the oxalate precipitation solution; the molar stoichiometric ratio The spherical precursor powder is weighed and uniformly mixed with one or both of the sodium source and...

Embodiment 1

[0025] see figure 1 , figure 1 It is a schematic flow chart of a method for preparing an air-stable layered transition metal oxide cathode material provided by the present invention. Specifically, the method for preparing the layered transition metal oxide cathode material may include:

[0026]The mixed solution of manganese sulfate, nickel sulfate, ferric sulfate and sodium hydroxide solution are pumped into the reactor to stir at the same time through a peristaltic pump. Atmosphere, the reaction temperature is 50 ° C, after the reaction is complete, let it stand for 2 hours, centrifuge, filter, wash, and dry to obtain spherical precursor powder; weigh the spherical precursor powder and sodium carbonate according to the molar ratio and mix them evenly, and Sintered at 800°C for 10 hours to obtain NaMn 0.67 Ni 0.13 Fe 0.2 o 2 .

Embodiment 2

[0028] according to figure 1 The preparation method process shown, obtains Na 0.85 Li 0.15 (Mn 0.67 Ni 0.13 Fe 0.2 ) 0.85 o 2 . Such as figure 2 As shown, the material has a spherical shape, and the particle size is 2-8 μm. XRD test results show as image 3 As shown, the material is an intergrown phase of P2 and O3.

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Abstract

The invention discloses an air-stable layered transition metal oxide positive electrode material and a sodium ion battery thereof. The chemical formula of a co-phase structure of the layered transition metal oxide positive electrode material P2/O3 is Na<1-x>Li<x>(Mn<0.67>Ni<0.33-y>Fe<y>)<1-x>O<2>, x is greater than 0 and less than or equal to 0.2, and y is greater than or equal to 0 and less thanor equal to 0.2. The synergistic effect of P2/O3 phase coexistence enables the positive electrode material and the sodium ion battery to show excellent electrochemical performance. The positive electrode material has the characteristics of low raw material cost, air stability, excellent performance, easiness in synthesis and environmental friendliness, and the sodium ion battery constructed by thepositive electrode material has the advantages of high energy density, cycling stability and good rate capability.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy, in particular to an air-stable layered transition metal oxide cathode material and a sodium ion battery thereof. Background technique [0002] Lithium-ion batteries have always been the main force of energy storage batteries used in portable electronic devices, electric vehicles and other fields, but limited lithium reserves and high prices prevent it from being widely used in large-scale stationary energy storage power stations. For this reason, Na-ion batteries have attracted extensive attention because of their abundant reserves, low cost, and similar energy storage mechanism. In the past few years, research on sodium-ion battery materials has achieved certain results, and major breakthroughs have been achieved in the development of cathode materials, including layered transition metal oxides, polyanionic compounds, and Prussian blue compounds. Wait. Layered transition metal o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/054
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/054Y02E60/10
Inventor 邓健秋黄凤彬王凤刘鹏姚青荣周怀营
Owner GUILIN UNIV OF ELECTRONIC TECH
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