Advanced materials: dendrite problems in zinc based batteries
water zinc battery with high safety high energy density is considered to be one of the promising energy storage technologies for the next generation of electronic products. In recent years due to the development of high-performance cathode materials electrolytes water-based zinc batteries show a booming trend. However the serious dendrite problem of metal zinc anode still restricts the industrial application of water zinc battery.
In order to solve this problem Professor Zhi Chunyi of City University of Hong Kong
systematically discussed the dendrite problem from the aspects of basic principle protection strategy characterization technology theoretical simulation; compared zinc dendrite with lithium dendrite aluminum dendrite as a whole highlighted their differences in origin topological structure; clarified the specific influencing factors of zinc dendrite summarized the results It includes cumulative effect cathode load (the difference between laboratory research practical application); summarizes classifies the research progress of zinc dendrite protection in recent years points out the inherent advantages limitations of various protection strategies; puts forward the challenges faced by zinc dendrite protection in the future. Challenges of
zinc metal anode:
(1) interface contact failure caused by dynamic contact: artificial interface layer has been developed to regulate ion current migration deposition. However the deposition dissolution of metal anode are accompanied by huge volume change which often leads to the separation of interface layer metal anode. This interface separation problem will be further magnified in the case of mechanical deformation. Therefore strengthening the interface contact from the structural chemical aspects will be the future development direction.
(2) atomic level ion current regulation: the ion current regulation of metal anode still mainly depends on the spatial induction of multi-level channels. The fine regulation based on the crystal structure gap of super ionic conductor will show a good application prospect in the dendrite suppression of metal anode in the future.
(3) from laboratory research to industrial application: at present the positive load level of water-based zinc battery in laboratory research is basically at 0.3 MAH cm-2 while the thickness of negative zinc sheet is 100 There is an obvious excess of negative electrode above μ m which seriously restricts the overall energy density of the battery. Combined with the current experience of commercial nickel zinc batteries lithium metal batteries the evaluation stard of zinc negative electrode in the future is proposed that is the discharge depth reaches 30%.
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