Room-temperature solid sodium ion battery based on liquid alloy

Abstract

The invention discloses a room-temperature solid sodium ion battery based on a liquid alloy, and belongs to the technical field of batteries, a negative electrode material is a liquid sodium-potassium alloy (9.2 to 58.2 wt% Na), a supporting framework of the negative electrode material is redox graphene, a sodium-potassium alloy negative electrode is obtained by combining the liquid sodium-potassium alloy and the redox graphene, and compared with pure metal sodium as a solid-state sodium ion battery negative electrode, the sodium-potassium alloy negative electrode can effectively improve the wettability of the negative electrode and an electrolyte interface, and can provide more active sites for metal sodium deposition, so that metal ions are distributed more uniformly, meanwhile, the three-dimensional porous structure of the redox graphene can relieve the volume change of metal sodium in the circulation process, the sodium-potassium alloy negative electrode is applied to the solid-state sodium-ion battery, the performance of the sodium-potassium alloy negative electrode is obviously improved, and more importantly, the solid-state sodium-ion battery is tested at normal temperature, and the realization of the room-temperature solid-state sodium ion battery based on the liquid alloy becomes possible.

Description

technical field [0001] The invention relates to the technical field of batteries, more specifically, to a room-temperature solid-state sodium-ion battery based on liquid alloys. Background technique [0002] Due to the aggravation of the energy crisis and the growing demand for electronic products, the demand for new high energy density rechargeable batteries is also increasing. Lithium-ion batteries have been widely studied due to their high cycle stability, but the development of lithium batteries is limited due to the scarcity of lithium metal resources. Among the congener elements of lithium, sodium metal has attracted great attention due to its abundant reserves in the earth's crust. In addition, due to the high specific capacity of metallic sodium (1166mAhg -1 ) and low electrode potential (-2.714Vvs standard hydrogen electrode) is considered to be an ideal anode material for Na-ion batteries. Moreover, metallic sodium anodes are used in high-energy sodium metal bat...

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Problems solved by technology

[0003] However, due to the use of lithium-organic liquid electrolytes, like lithium metal, sodium metal also faces the safety hazard of fire or even explosion during the deposition and dissolution process, which greatly limits its practical application in sodium batteries.

[0004] Replacing traditional organic electrolytes with nonflammable solid-state electrolytes is an effective solution. Solid-state Na-ion batteries are considered to be one of the ideal candidates for next-generation energy storage devices due to their high energy density and safety. However, solid-state Na-ion batteries The development of ion batteries is also facing difficulties at present. Due to the use of metallic sodium as the negative electrode, the application of solid sodium ion batteries is limited by the poor contact between the metallic sodium negative electrode and the solid electrolyte interface. The poor wettability of metallic sodium on the electrolyte leads to insufficient charge. Uniform deposition and growth penetration of dendrites eventually lead to premature failure of the battery. For this reason, we propose a room-temperature solid-state Na-ion battery based on liquid alloys

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