Copper-manganese aqueous secondary battery based on deposition/dissolution reaction on positive and negative poles

Abstract

The invention belongs to the technical field of electrochemistry and particularly provides a copper-manganese aqueous secondary battery based on deposition/dissolution reaction on positive and negative poles. The battery system specifically comprises a negative current collector, a positive current collector, an aqueous electrolyte containing bivalent copper ions and bivalent manganese ions as well as a porous separator for separating the positive and negative poles. When the battery is charged, the bivalent manganese ions in a positive pole area lose electrons and are oxidized into solid manganese dioxide, solid manganese dioxide is deposited on the positive current collector, and the copper ions in a negative pole area gain electrons and are reduced into metal copper, and metal copper isdeposited on the negative current collector; during discharging, manganese dioxide on the positive pole gain the electrons and is reduced into bivalent manganese ions, the bivalent manganese ions aredissolved in the electrolyte, meanwhile, copper on the negative pole releases electrons and is oxidized into bivalent copper ions, and the bivalent copper ions are dissolved in the electrolyte. The battery has the advantages of ultrahigh power density, ultra-long cycle life, high safety and low toxicity, and can be widely applied to the fields of large energy storage and the like.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a copper-manganese water-based secondary battery in which both positive and negative electrodes are deposition / dissolution reactions. Background technique [0002] Since the 21st century, the world's increasing energy demand has made the world's crude oil supply increasingly tight, and the environmental problems caused by the use of fossil fuels, such as global warming and increasingly serious smog weather, have also attracted more and more attention. At present, the development and utilization of new energy has become the focus of our government's work. Nowadays, countries point out that they should accelerate the increase in the proportion of renewable energy such as hydropower, wind energy, solar energy, and biomass energy, and must focus on making breakthroughs in the development and utilization of renewable energy, especially new energy grid-connected technolog...

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Problems solved by technology

However, the large-scale use of the above-mentioned aqueous battery system still faces many challenges and bottlenecks.

First of all, lead-acid batteries, nickel-cadmium vanadium flow batteries, zinc-bromine flow batteries, etc. all contain environmentally unfriendly toxic elements, such as lead ions, cadmium, cadmium ions, and elemental bromine; secondly, aqueous lithium ions / sodium ions The electrode reactions of batteries and lead-acid batteries involve ion intercalation and deintercalation and transformation of crystal structure, showing limited cycle life and power density; finally, the existing commercial vanadium flow batteries, zinc-bromine flow batteries must adopt expensive and The fluorine-containing ion exchange membrane is used as a battery separator, which increases the cost and aggravates environmental pollution

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