Chargeable water-system zinc ion battery with long cycle life and high energy density

Abstract

Disclosed is a chargeable water-system zinc ion battery with long cycle life and high energy density. The chargeable water-system zinc ion battery comprises a positive electrode shell, an elastic sheet, a gasket, a positive electrode active substance, a diaphragm, a negative electrode active substance and a negative electrode shell, and all the components form a laminated layer structure in sequence, wherein the positive electrode active substance is positive ion defect type ZnMn<x>O<4> / C nanocomposite; the negative electrode is zinc foil or spherical zinc powder; the diaphragm is polyethylene nonwoven fabric or filter paper; and the electrolyte is a zinc trifluoromethanesulfonate water solution. The chargeable water-system zinc ion battery has the advantages that the ZnMn<x>O<4> / conductive carbon composite electrode material has simple and easily feasible preparation process; the synthesized ZnMn<x>O<4> nano crystals are uniformly embedded in the conductive carbon; due to the electrolyte, the Zn deposition / separation-out coulombic efficiency can reach about 100% and a wide electrochemical window of 0-2.5Vvs.Zn<2+> / Zn is realized; the positive electrode active substance and the novel electrolyte are applied to the water-system zinc ion battery, so that the battery shows a good electrochemical performance; and meanwhile, the battery has high reversible zinc storage capacity with high active substance content, and excellent cycling stability .

Description

technical field [0001] The invention relates to a water-chargeable zinc-ion battery with long cycle life and high energy density, which belongs to the field of new chemical power sources and new energy materials. Background technique [0002] With the development of the economy and the progress of the society, the pressure of environmental protection and response to global climate change is also increasing, and the contradiction between the sustainable supply of electricity and energy and the needs of economic development is becoming more and more prominent. Promoting the large-scale development and utilization of clean energy, actively developing smart grids, and realizing a low-carbon economy have become a realistic choice for international power development. Renewable energy based on solar energy and wind energy is an important way to achieve sustainable energy development in my country. Since renewable energy power generation is affected by factors such as seasons, sunsh...

AI Technical Summary

Problems solved by technology

However, due to the MnO 2 During the discharge process, there are structural deformations caused by the Jahn–Teller effect and the Mn 2+ Dissolution (2Mn 3+ (s)→Mn 4+ (s)+Mn 2+ (aq)), leading to poor cycle stability (typically less than 50 cycles)

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