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Lithium-yttrium co-doped high-performance sodium ion battery positive electrode material and preparation method thereof

A technology of sodium ion battery and positive electrode material, applied in battery electrodes, active material electrodes, positive electrodes, etc., can solve the problem of irreversibility of anion redox reaction, achieve high energy density and structural stability, good electrochemical reversibility, The effect of high reversible capacity

Inactive Publication Date: 2021-08-27
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of irreversible anion redox reaction in the existing P2 type layered iron-manganese-based sodium ion battery positive electrode material, to provide a kind of high structural stability, high capacity, simple operation, low cost and other advantages. Rare earth-based sodium ion battery layered positive electrode material and preparation method thereof

Method used

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  • Lithium-yttrium co-doped high-performance sodium ion battery positive electrode material and preparation method thereof
  • Lithium-yttrium co-doped high-performance sodium ion battery positive electrode material and preparation method thereof
  • Lithium-yttrium co-doped high-performance sodium ion battery positive electrode material and preparation method thereof

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Embodiment 1

[0030] This embodiment provides a lithium-yttrium co-doped layered oxide material whose general chemical formula is Na x Fe a mn b Li c Y d o 2 , wherein the range of the mole percentage of each element in the material is 0.6≤x≤0.7, 0.075<a≤0.27, 0.62≤b≤0.75, 0.11≤c≤0.175, 0<d≤0.1, where a, b, c , the relationship of d satisfies a+b+c+d=1, and the entire chemical formula should maintain electrical neutrality.

[0031] Further, the preparation steps of the lithium-yttrium co-doped layered oxide material are:

[0032] Step 1, Na 2 CO 3 , Fe 2 o 3 , MnO 2 , Li 2 CO 3 and Y 2 o 3 Mixing according to the stoichiometric ratio, adding an appropriate amount of solvent, wherein the solvent is ethanol, to obtain a mixture;

[0033] Step 2, transferring the mixture to an agate ball mill jar, and placing the agate ball mill jar on a planetary ball mill for wet ball milling for 5 hours;

[0034] Step 3, drying the mixture obtained after ball milling to obtain a precursor; ...

Embodiment 2

[0039] Sodium carbonate, manganese dioxide, iron oxide, lithium carbonate and yttrium oxide are used as precursors, mixed according to the ratio of Na:Fe:Mn:Li:Y of 0.6:0.26:0.62:0.11:0.01, dissolved in 10mL NMP to obtain a mixed solution, and then transfer the mixed solution to a ball mill tank for ball milling. The ball milling speed is 600rpm, and the ball milling time is 4h. Precalcined at 450°C for 4h, then calcined at 950°C for 18h, the heating and cooling rate was 5°C / min, and the lithium-yttrium co-doped layered positive electrode material Na 0.6 Fe 0.26 mn 0.62 Li 0.11 Y 0.01 o 2 .

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Abstract

The invention discloses a lithium-yttrium co-doped high-performance sodium ion battery positive electrode material and a preparation method thereof. The sodium ion battery positive electrode material is a lithium-yttrium co-doped P2 type layered transition metal oxide material, the specific chemical formula is NaxFeaMnbLicYdO2, wherein 0.6 < = x < = 0.7, 0 < a < = 0.27, 0.62 < = b < = 0.75, 0.11 < = c < = 0.175, and 0 < d < = 0.1. The preparation process comprises the following steps: preparing a precursor by using a wet ball milling method, and then calcining step by step by using a medium-low temperature solid phase sintering method to synthesize a target material, wherein the first reversible capacity of the material is about 200-220mAh / g. The prepared material can be applied to the field of sodium ion batteries, oxygen ions in the material can participate in a redox reaction, and rare earth Y < 3 + > ions have a strut effect, so that the material has the advantages of high working voltage, high energy density and good structural stability; and the prepared material is rich in element reserves related to synthesis, environment-friendly, low in manufacturing cost and wide in application prospect.

Description

technical field [0001] The invention relates to a positive electrode material for a sodium ion battery, in particular to a lithium yttrium co-doped high-performance positive electrode material for a sodium ion battery and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries have been widely used in various fields such as energy and information conversion and drive, such as mobile phones, portable electronic products and electric vehicles; however, the scarcity of lithium resources severely limits its application in large-scale energy storage, Sodium, which belongs to the same main group as lithium, is abundant in nature, evenly distributed and cheap, so sodium-ion batteries have low production costs and good commercial prospects. Nevertheless, the development of sodium-ion batteries still faces serious bottlenecks, and there are some bottlenecks in development, such as low specific capacity of cathode materials and poor cycle performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M10/054
CPCH01M4/525H01M4/505H01M10/054H01M2004/028Y02E60/10
Inventor 曹明慧林诗雅黄芬芬
Owner EAST CHINA UNIV OF TECH
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