Ternary cyano framework material as well as preparation method and application thereof

Abstract

The invention discloses a ternary cyano framework material as well as a preparation method and application thereof. The structural general formula of the ternary cyano framework material is AnMnxFeyNiz[Fe(CN)6]m, in the formula, A is selected from one or more of Na<+>, K<+> and NH4<+>, 1.5<n<=2, 0.8<m<=1, 0.4<=x<=0.6, 0.2<=y<=0.4, 0.1<=z<=0.3, and x+y+z=1. The preparation method comprises the following steps: mixing ferrous cyanide with deionized water to obtain a solution I; mixing soluble bivalent manganese salt, iron salt, nickel salt, inorganic acid salt, organic acid salt and deionized water to obtain a solution II; and adding the solution I into the solution II, and carrying out coprecipitation reaction to obtain the ternary cyano framework material. The ternary cyano framework material is coupled with three elements of manganese, iron and nickel, has high working voltage, high capacity, excellent rate capability and cycling stability, and has excellent comprehensive performance.

Description

technical field [0001] The invention relates to the field of low-cost energy storage batteries, in particular to a ternary cyano frame material and its preparation method and application. Background technique [0002] With the increasingly serious energy and environmental problems on a global scale, the development of sustainable clean energy, such as solar energy, tidal energy, and wind energy, has been paid more and more attention, but this type of clean energy has the disadvantage of instability, that is, the Due to the variability of the environment, high-performance, sustainable, cheap and environmentally friendly energy storage batteries are required. Currently, common energy storage batteries include sodium-sulfur batteries, lithium-ion batteries, lead-acid batteries, lead-carbon batteries, and flow batteries. However, the overall performance of this type of energy storage battery is not ideal, or it faces cost issues, or resource issues, or environmental issues, or ...

AI Technical Summary

Problems solved by technology

Manganese-based, iron-based, and nickel-based materials are typical materials in cyano-based framework materials. Manganese-based materials have high voltage and high capacity, but their electrical conductivity is low, and the rate performance is poor, and the trivalent manganese element will cause John -Teller effect, which leads to unsatisfactory cycle performance; iron-based materials have excellent rate performance and cycle life, but the working voltage is low, the first storage efficiency is not high, and the capacity is generally far from the theoretical value; the structure of nickel-based materials is stable, It has excellent rate performance and cycle life, and a medium working voltage, but because nickel is an inactive element, the capacity is low, and the price of nickel is high, resulting in high material cost

Although manganese-based, iron-based, and nickel-based cyano-based frameworks have their own advantages, such as high capacity, high voltage, good rate performance, and stable structure, any one material cannot simultaneously possess the above comprehensive properties.

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