A rechargeable aqueous zinc-ion battery with long cycle life and high energy density

Abstract

A long-life, high-energy-density rechargeable water-based zinc-ion battery, which consists of a positive electrode shell, shrapnel, gasket, positive active material, diaphragm, negative active material, and negative shell, and sequentially forms a laminated structure. The positive active material is a cation-deficient type. ZnMnxO4 / C nanocomposite material, the negative electrode is zinc foil or spherical zinc powder, the diaphragm is polyethylene non-woven fabric or filter paper, and the electrolyte is zinc trifluoromethanesulfonate aqueous solution. The invention has the advantages that the preparation process of ZnMnxO4 / conductive carbon composite electrode material is simple and easy, and the synthesized ZnMnxO4 nanocrystals are evenly embedded in the conductive carbon; the electrolyte can realize Zn deposition / precipitation Coulomb efficiency of about 100% and wide electrochemical window 0‑2.5V vs. Zn2+ / Zn; the positive electrode active material and new electrolyte are applied to the aqueous zinc-ion battery, showing good electrochemical performance, high reversible zinc storage capacity and excellent cycle stability of the active material.

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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