Potassium ion battery cathode material based on Ni/Mn binary oxide and preparation method thereof

Abstract

The invention discloses a potassium ion battery cathode material based on Ni / Mn binary oxide and a preparation method thereof. The method includes steps of: dissolving nickel salt, manganese salt, potassium salt and a doping element salt in deionized water to prepare a metal ion salt solution in certain concentration; adding the metal ion salt solution to organic acid or organic acid salt solutionwith stirring; heating the organic acid or organic acid salt precursor turbid liquid to evaporate water until the water is evaporated completely to obtain an organic acid salt precursor powder, or directly mixing organic acid salts containing Ni / Mn / K to prepare an organic acid salt precursor; and grinding, pre-sintering and re-grinding the precursor powder, and roasting the powder at high temperature to obtain the cathode material. The method has high controllability in process, is low in production cost, and is easy to carry out in large-scale production.

Description

technical field [0001] The invention relates to a positive electrode material for a potassium ion battery and a preparation method thereof, in particular to a positive electrode material for a potassium ion battery based on nickel-manganese binary oxide and a preparation method thereof. Background technique [0002] With the rapid economic development and the rapid expansion of industry, the consumption of fossil fuels represented by the three main energy sources of coal, oil and natural gas has increased sharply. This excessive development and use of non-renewable resources has exacerbated energy shortages and global environmental The contradiction between deterioration seriously restricts the development of human economy and society. Therefore, the development of clean and renewable new energy is one of the most decisive technical fields in the world economy in the future. As a new, clean and renewable energy source, lithium-ion secondary batteries have the characteristic...

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Problems solved by technology

[0004] Chinese invention patent application CN 107226475 A proposes a positive electrode material for potassium-ion batteries based on Prussian blue, although its capacity can reach 90.7mAh / g, after 400 cycles, the capacity retention rate is 90.37%; however, this material has poor operation controllability, Difficult to mass-produce

[0005] Chinese invention patent application CN 107093739 A proposes a potassium ion battery cathode material based on potassium manganese oxide, and its capacity can reach 83.9mAh / g, but this material has the disadvantages of poor cycle performance and no obvious discharge platform

[0006] Chinese invention patent application CN 105826521 A proposes a positive electrode material for potassium-ion batteries based on polyanionic compounds, which has an obvious discharge platform at around 1.6V, but this type of material has the problem of low energy density;

[0007] Kuniko Chihara found that a KVPO can be obtained by high temperature roasting 4 F's positive electrode material for potassium ion batteries, which has a discharge platform up to 4V and excellent rate performance, but this type of material has the disadvantage of low specific capacity;

[0008] Since the research on cathode materials for potassium-ion batteries is still in its infancy, the types of cathode materials currently reported are very limited, and these materials all have one or another deficiency, which seriously hinders the commercialization process of potassium-ion batteries. Therefore, it is urgent to develop new types of cathode materials. High-performance cathode materials for potassium-ion batteries

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