3d track alloy sulfide material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of battery materials. The invention relates to a sulfide material, in particular to a 3d track alloy sulfide material and a preparation method and application thereof. The chemical formula of the 3d orbital alloy sulfide material is Fe0. 5CoxNiyS2, the preparation method comprises the steps of crushing, melting, hydrothermal reaction and high-temperature purification, and the 3d orbital alloy sulfide material is used for preparing a positive electrode for a thermal battery, a positive electrode for a lithium-sulfur battery and a negative electrode for a sodium-ion battery.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a 3D orbital alloy sulfide material and its preparation method and application. Background technique [0002] Transition metal sulfide materials, such as iron disulfide, cobalt disulfide, nickel disulfide, molybdenum disulfide, molybdenum diselenide, tungsten disulfide, tungsten diselenide, niobium disulfide, etc., have semiconductor or superconducting properties and are widely used Used in optical, electrical and other fields. [0003] Thermal battery is a kind of storage primary battery with molten salt as electrolyte. Its main targets are missiles and nuclear weapons. The commonly used cathode materials are transition metal sulfides such as iron disulfide, cobalt disulfide, and nickel disulfide, but the kinetic energy is slow. The capacity release bottleneck caused by the reaction limits the capacity release of cathode materials and hinders the development of high s...

AI Technical Summary

Problems solved by technology

[0003] Thermal battery is a kind of storage primary battery with molten salt as electrolyte. Its main targets are missiles and nuclear weapons. The commonly used cathode materials are transition metal sulfides such as iron disulfide, cobalt disulfide, and nickel disulfide, but the kinetic energy is slow. The capacity release bottleneck caused by the reaction limits the capacity release of cathode materials and hinders the development of high specific energy thermal batteries

[0004] Lithium-sulfur battery is a secondary battery using electrolyte, and its main target is unmanned devices. It usually uses elemental sulfur as the positive electrode active material, and uses carbon-based, oxygen-based, and sulfur-based transition metal compounds as sulfur supports to provide Excellent high specific capacity, but the shuttle effect of elemental sulfur greatly limits the development of lithium-sulfur batteries

[0005] Sodium-ion battery is a secondary battery using electrolyte. Its main target is the power supply of base stations. It usually uses metal sodium flakes or transition metal sulfides as negative electrodes. Compared with sodium flakes, transition metal sulfides are cheap and recyclable. Good, high safety (no dendrites), but the poor intercalation reaction kinetics of transition metal sulfides limits its development, and conversion transition metal sulfides cannot be used

[0006] In order to solve the existing technical problems, an alloying strategy is usually adopted; the document Angew Chem Int Ed Engl, 2016,55(41):12822-12826 reported a single-phase binary alloy sulfide Fe x co 1-x S 2 Application in sodium-ion batteries, but there is no record of the influence of a third metal element on its crystal structure, physical properties and electrochemical performance; the document JAlloys Compd, 2018,762:109-114 synthesized Fe 0.5 co 0.5 S 2 Single-phase materials, and disclosed its performance characteristics in thermal batteries, and did not involve the impact of the third metal element doping on its crystal structure, physical properties and electrochemical performance; literature Carbon, 2015, 90: 44-52 synthesized Ni x co 1-x S 2 Single-phase materials, and reported its application in supercapacitors, and did not involve the impact of the third metal element doping on its crystal structure, physical properties, and electrochemical performance

[0007] Patent 201810792243.1 for the first time alloy compound Fe x co 1-x S 2 , Fe x Ni 1-x S 2 、 Co x Ni 1-x S 2 or Fe x co y Ni 1-x-y S 2 One of them, 0x co y Ni 1-x-y S 2 (0<x<1, 0<x+y<1) has high thermal stability, and records of how to change it to release abnormal capacity; At least one is a metal source, using thiourea as a metal sulfide prepared as a sulfur source, and using it as a counter electrode in a dye-sensitized solar cell and applying it to hydrogen production by electrolysis of water, but its electrode aspect Narrow range of applications

[0008] In the current published technology, there is no report on the embedded single-phase 3d orbital alloy sulfide Fe-Co-Ni-S materials with high thermal stability, and there is no record about the inconsistent valence state of the cations of such materials

Images