Quintuple layered oxide cathode material for sodium ion battery and preparation method of quintuple layered oxide cathode material

A technology of sodium ion battery and cathode material, applied in the field of electrochemistry, can solve the problems of high cost of lithium ion battery, limited metal lithium reserves, environmental pollution and the like

Inactive Publication Date: 2015-12-16
FUDAN UNIV
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Problems solved by technology

Large-scale energy storage requires a large amount of chemical power sources. The relatively mature commercialized batteries such as lead-acid batteries will cause great environmental pollution due to the use of h

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  • Quintuple layered oxide cathode material for sodium ion battery and preparation method of quintuple layered oxide cathode material

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Embodiment Construction

[0015] The present invention is further described below by way of examples.

[0016] Use stoichiometric ratios of sodium carbonate, nickel oxide, cobalt oxide, iron oxide, titanium oxide, manganese oxide (or other precursors that can only generate oxides by pyrolysis) to mix evenly, and then press them into small discs. It is placed in an electric furnace with oxygen flow and air for high-temperature reaction, and a single-phase five-element layered oxide NaNi can be obtained. m Fe n co x mn y Ti z o 2 (0m,n,x,y,z m Fe n co x mn y Ti z o 2 .

[0017] The prepared powder was made into a working electrode, and a high-purity sodium sheet was used as a counter electrode to assemble a button cell. The electrolyte is NaClO 4 +EC+PC (V / V=1 / 1), add 5% FEC, (the volume ratio of EC to DMC is 1 / 1), and the battery is assembled in an argon-filled dry box. The charging and discharging of the battery is carried out on the Land battery test system. NaNi m Fe n co x mn y Ti ...

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Abstract

The invention belongs to the technical field of a sodium ion battery, in particular relates to a quintuple layered oxide cathode material for a sodium ion battery and a preparation method of the quintuple layered oxide cathode material. A single-phase quintuple layered oxide NaNi<m>Fe<n>Co<x>Mn<y>Ti<z>O2 is obtained by uniformly mixing materials of sodium carbonate, nickel oxide, cobalt oxide, ferric oxide, titanium oxide and manganese oxide (or other precursors of manganese oxides only can be generated through high-temperature decomposition) according to stoichiometric ratios, pressing the mixture into a small wafer and placing the small wafer in an electric furnace having oxygen flow and air for high-temperature reaction, wherein m, n, x, y and z are more than 0 and less than 1. When the electrode material is applied to the sodium ion battery, the initial specific capacity reaches 128mAh/g, the average voltage is 3.1V, for Na<+>/Na, the specific energy can reaches 396Wh/kg, and the capacity retention ratio of the electrode after 300 cycles in a 4C rate is 90%. The NaNi<m>Fe<n>Co<x>Mn<y>Ti<z>O2 is high in electrochemical stability, specific capacity, rate performance and cycle performance, and the preparation method is simple and is applicable for the sodium ion battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a positive electrode material for a sodium ion battery and a preparation method thereof. Background technique [0002] Due to the massive use of traditional energy sources such as fossil fuels, global environmental problems and climate change have been caused. On the other hand, the reserves of non-renewable energy sources such as fossil fuels are also limited. Therefore, the development of new energy is particularly important. Wind energy, solar energy, tidal energy, etc. are greatly affected by weather and location, so their effective use requires the use of them in combination with chemical power sources, and the electrical energy they generate is stored in chemical Power is delivered to users through the grid. Large-scale energy storage requires a large amount of chemical power sources. The relatively mature commercialized batteries such as lead-acid bat...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/054
CPCH01M4/485H01M4/505H01M4/525H01M10/054Y02E60/10
Inventor 岳继礼傅正文
Owner FUDAN UNIV
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