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

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...

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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 heavy metal lead. For lithium-ion batteries, if they are used on a large scale, on the one hand, Lithium metal reserves are limited in the earth's crust, on the other hand the cost of lithium-ion batteries is high

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