Neutral zinc-manganese secondary battery and electrolyte

Abstract

The neutral zinc-manganese battery comprises a neutral zinc-manganese flow battery and a storage battery. The storage battery structure mainly comprises a positive electrode, a negative electrode, anelectrolyte and a diaphragm, and the corresponding flow battery also comprises pumps, pipelines, storage tanks and the like of positive and negative electrodes. For two structures of the flow batteryand the storage battery, the anode and cathode materials are both porous carbon felts, and the membrane material is a high polymer material. For the storage battery, the electrolyte is stored in the porous electrode, and for the flow battery, the positive electrolyte and the negative electrolyte flow through the positive electrode and the negative electrode through the pump and the pipeline and finally return to the storage tank, so that the circulation of the electrolyte in the electrode chamber and the storage tank is realized. Different from the embedding and removing mechanism of the traditional zinc-manganese secondary battery, the dissolving and depositing mode can avoid the collapse problem of the material structure in the circulating process, so that the cycle life of the battery is greatly prolonged. In addition, the reaction is double-electron transfer, so that the energy density of the battery is greatly improved.

Description

Technical field[0001]The present invention relates to the field of battery, in particular in the field of zinc manganese secondary battery.Background technique[0002]The large use of fossil energy has caused very serious environmental pollution, so the development and utilization of renewable energy is the key to solving the above problems. However, discontinuous instability of renewable energy makes the direct utilization of renewable energy, so the continuous supply of renewable energy is used to achieve renewable energy. Zinc-based cells are a very promising battery technology due to low cost, good electrochemical activity and high energy density. As a zinc-based battery, zinc manganese batteries are the most widely used battery cells, but is limited to the development of corresponding secondary batteries. This is mainly due to the unstable in the cycle, causes the collapse of the material structure during charge and discharge. Currently, more positive electrode materials are vari...

AI Technical Summary

Problems solved by technology

However, the structural stability of the positive electrode material is very poor, and the utilization rate of the electrode active material is very low; in addition, the dendrite problem of the zinc negative electrode in an alkaline environment seriously further limits the cycle life of the battery; the most important thing is that the above two zinc The positive electrode reaction of the manganese battery is single electron transfer, and the specific capacity of the battery is relatively low

Before our department Zhang Huamin and others also reported a kind of "a kind of zinc-manganese secondary battery" (CN105280964A), the positive electrode is Mn 2+ and MnO 2 solid-liquid phase transition, but this system uses a strong acid electrolyte, which is very corrosive to the zinc negative electrode. In addition, MnSO 4 The system electrolyte will be accompanied by Mn during the charging process 3+ The generation (equation 1) and the side reaction of disproportionation to generate MnO2 (equation 2), the capacity of the battery decays seriously

Images