A kind of flame-retardant sodium-ion battery electrolyte and its application

Abstract

The invention relates to a flame retardant sodium-ion battery electrolytic solution and application thereof. The electrolytic solution comprises the following ingredients with the concentration: 0.001-2mol / L sodium salt, carbonate esters and / or ether organic solvents, 0.1-50% of a flame retardant additive and 0-0.5mol / L other functional additives. The flame retardant sodium-ion battery electrolytic solution is applied into a sodium primary battery, a sodium secondary battery and a sodium ion battery. A sulfuryl fluoride base group-containing compound has good flame retardance, has little influence on the electrochemical performance and can be used as a novel electrolytic solution flame retardant additive; the flame retardant additive is added into the electrolytic solution, so that the combustibility of the electrolytic solution can be reduced. A phosphonitrile base group-containing compound has good flame retardance, has little influence on the electrochemical performance, and can be used as a novel electrolytic solution flame retardant additive; the flame retardant additive is added into the electrolytic solution, so that the combustibility of the electrolytic solution can be reduced. After the electrolytic solution is applied to the sodium battery, the combustion possibility of the electrolytic solution is zero.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a flame-retardant sodium-ion battery electrolyte and an application thereof. Background technique [0002] With the rapid development of information technology and the increasing popularity of portable electronic devices, the demand for high specific energy batteries is increasing year by year. Sodium batteries have significant advantages such as low price, high voltage similar to lithium, low self-discharge rate, and high energy density. They are expected to gradually replace lithium batteries and continue to expand their application fields and market share. [0003] However, the potential safety hazards of sodium batteries have always been our primary concern. Since the electrolyte used in the sodium battery is a mixed solvent system of flammable carbonate (ether), when the battery is overcharged, short-circuited or heated, the battery may catch fire, bur...

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Problems solved by technology

However, there are very few studies on flame-retardant electrolytes for sodium batteries. Therefore, it is necessary to develop new electrolyte solutions for sodium-ion batteries with high flame retardancy and good electrochemical compatibility.

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