Shulou(Shulou.com)11/24 Report--

CTOnews.com, January 10, according to the website of the University of Science and Technology of China, Professor Chen Wei's research group of the School of Chemistry and Materials Science of the university designed a stable metal / metal-zinc alloy heterojunction interface layer, which realized the stable deposition and dissolution of zinc-free dendrites under large surface capacity (200mAh / cm2) and the energy density of zinc-bromine battery up to 274Wh/kg. In addition, the high-capacity zinc-bromine battery shows excellent cycle stability, and the battery module integrated with the photovoltaic panel shows its storage capacity for renewable energy. The relevant research papers have been published in the international journal Nature Communications.

Water zinc battery has the characteristics of low cost, long life and high safety, so it is the most powerful competitor for the next generation of large-scale energy storage battery technology. However, zinc battery faces a series of problems, which seriously affect its industrialization process: uncontrollable side effects of zinc negative electrode, such as dendrite growth, hydrogen evolution, etc., which limit the cycle life of the battery; too high positive / negative electrode ratio and low area capacity in zinc battery reduce the energy density of the battery; lack of research on the performance of Ah large capacity battery and its application in energy storage system.

CTOnews.com learned that a two-dimensional antimony / antimony-zinc alloy (Sb/Sb2Zn3) heterojunction interface layer was designed to stabilize the deposition / dissolution of zinc at large surface capacity. The Sb/Sb2Zn3 heterojunction interface shows strong adsorption to zinc atoms and uniform electric field distribution during zinc deposition, thus achieving zinc deposition / dissolution without dendrite at 200 mAh / cm2 with ultra-high surface capacity. In addition, the zinc-free negative electrode modified by the heterostructure interface was combined with the bromine positive electrode to form a negative-free zinc-bromine battery, showing the theoretical energy density of 274 Wh/kg and the actual energy density of 62Wh/kg. The large-capacity zinc-bromine battery with a capacity of 500 Ma showed more than 400 stable cycles. The batteries further magnified to 1.5Ah show excellent discharge voltage and efficiency in different series-parallel forms. In addition, the integration of zinc bromine battery module with 9 Wh energy (6 V 1.5 Ah) and photovoltaic panel shows its practical renewable energy storage capacity.

It is reported that the non-negative zinc bromine battery with excellent performance has been obtained by designing the metal / metal zinc alloy heterojunction interface, which will open up a new way for the application of zinc battery in large-scale energy storage.

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