Hybrid-phase structure layered oxide material and preparation method and application thereof

A technology of oxides and structural layers, applied in the field of materials, can solve problems such as rising battery costs

Inactive Publication Date: 2019-04-05
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Hybrid-phase structure layered oxide material and preparation method and application thereof
  • Hybrid-phase structure layered oxide material and preparation method and application thereof
  • Hybrid-phase structure layered oxide material and preparation method and application thereof

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Example Embodiment

[0063] Example 1

[0064] Example 1 of the present invention provides a layered oxide material with a mixed phase structure, the general chemical formula is: Na x Ni i Fe j Mn k M y O 2+β .

[0065] Among them, M is an element for doping and replacing transition metal sites, specifically Li + , Cu 2+ , Mg 2+ , Mn 2+ , Zn 2+ , Co 2 + , Ca 2+ , Ba 2+ , Sr 2+ , Mn 3+ , Al 3+ , B 3+ , Cr 3+ , Co 3+ , V 3+ , Zr 4+ , Ti 4+ , Sn 4+ , V 4+ , Mo 4+ , Mo 5+ , Ru 4+ , Nb 5+ , Si 4+ , Sb 5+ , Nb 5+ , Mo 6+ , Te 6+ One or more of;

[0066] x, y, i, j, k, and β are the mole percentages of the corresponding elements; the relationship between x, y, i, j, k, and β satisfies y+i+j+k=1, and x +my+2i+3j+4k=2(2+β); where 0.6≤x≤0.9; 0

[0067] The structure of the mixed phase layered oxide is a mixed phase of P2 and O3, and the space groups are respective...

Example Embodiment

[0069] Example 2

[0070] Example 2 of the present invention provides a method for preparing a mixed-phase structure layered oxide material, which is a solid phase method, such as figure 2 Shown, including:

[0071] Step 210, mixing the required stoichiometric amount of sodium from 100% to 108% by weight of sodium carbonate and the required stoichiometric amount of nickel oxide, iron oxide, manganese oxide, and M oxide to form a precursor;

[0072] M specifically Li + , Cu 2+ , Mg 2+ , Mn 2+ , Zn 2+ , Co 2+ , Ca 2+ , Ba 2+ , Sr 2+ , Mn 3+ , Al 3+ , B 3+ , Cr 3+ , Co 3+ , V 3+ , Zr 4+ , Ti 4+ , Sn 4+ , V 4+ , Mo 4+ , Mo 5+ , Ru 4+ , Nb 5+ , Si 4+ , Sb 5+ , Nb 5+ , Mo 6+ , Te 6+ One or more of;

[0073] Step 220, uniformly mixing the precursors by a ball milling method to obtain precursor powders;

[0074] Step 230, placing the precursor powder in a muffle furnace, and heat treating it in an air atmosphere at 700°C to 1000°C for 2 to 24 hours;

[0075] Step 240: Grind the heat-treated pre...

Example Embodiment

[0076] Example 3

[0077] Example 3 of the present invention provides a method for preparing layered oxide material with mixed phase structure, spray drying method, such as image 3 Shown, including:

[0078] Step 310: Mix the required stoichiometric amount of sodium carbonate from 100wt% to 108wt% of sodium and the required stoichiometric amount of nickel oxide, iron oxide, manganese oxide and M oxide into a precursor in proportion; or adopt the corresponding stoichiometric ratio Sodium nitrate, nickel nitrate, iron nitrate, manganese acetate and M nitrate are precursors;

[0079] The M is specifically Li + , Cu 2+ , Mg 2+ , Mn 2+ , Zn 2+ , Co 2+ , Ca 2+ , Ba 2+ , Sr 2+ , Mn 3+ , Al 3+ , B 3+ , Cr 3+ , Co 3 + , V 3+ , Zr 4+ , Ti 4+ , Sn 4+ , V 4+ , Mo 4+ , Mo 5+ , Ru 4+ , Nb 5+ , Si 4+ , Sb 5+ , Nb 5+ , Mo 6+ , Te 6+ One or more of;

[0080] Step 320: Add ethanol or water to the precursor and stir to form a slurry;

[0081] Step 330, spray drying the slurry to obtain a precursor powde...

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Abstract

The embodiment of the invention relates to a hybrid-phase structure layered oxide material and preparation method and application thereof. The chemical formula of the hybrid-phase structure layered oxide material is Na<x>NiFe<j>Mn<k>M<y>O<2+Beta>, wherein M is an element for doping and substituting a transition metal site, x, y, i, j, k and Beta are respectively mole percents occupied by corresponding elements, (y+i+j+k) is equal to 1, (x+my+2i+3j+4k)=2(2+Beta), x is more than or equal to 0.6 but less than or equal to 0.9, i is more than 0 but less than or equal to 0.3, j is more than 0 butless than or equal to 0.5, k is more than 0 but less than or equal to 0.5, Beta is more than or equal to -0.02 but less than or equal to 0.02, m is valence of M, the structure of a hybrid-phase layered oxide is a hybrid phase of P2 and O3, the space groups are respectively P63/mmc and R-3m, in oxygen distribution of the hybrid phase, a part of oxygen forms P-type distribution, a part of oxygen forms O-type distribution, and the two structures are compatible in a staggered way in atomic scale.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a layered oxide material with mixed phase structure and its preparation method and application. Background technique [0002] With the development of society, the consumption of fossil energy is increasing and it is close to exhaustion. Large-scale utilization of renewable clean energy such as solar and wind energy is urgent. However, due to the intermittent nature of this kind of energy, it is difficult to connect to the grid, so electrochemical energy storage is particularly important. Lithium-ion batteries have been commercialized with great success due to their high energy density and power density. However, because lithium resources are limited and the extraction cost is high, the cost of lithium-ion batteries increases, which cannot meet the low-cost requirements of large-scale applications; and the element sodium and lithium in the same main group have very similar phy...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/50H01M4/52H01M10/054
CPCH01M4/366H01M4/483H01M4/502H01M4/523H01M10/054Y02E60/10
Inventor 戚兴国刘丽露高飞杨凯胡勇胜陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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