Japan's Materials Research Institute recently announced that one of their research team successfully synthesized manganese oxide nanosheets and grapheme alternately overlapping materials as the composite materials for lithium and sodium ion rechargeable battery anode material can charge and discharge capacity of the battery by two Times, and can extend the service life, to solve the problem of both capacity and life can not have.
High capacity is one of the goals of the secondary battery, the current use of its negative electrode is a carbon material, in theory, the transition metal oxide with high capacity, is expected to become a substitute for carbon materials, especially with a hierarchical structure of manganese oxide, The peeled off into a single molecular thickness of the nanosheet, as a negative electrode, the surface are all active, can greatly improve the capacity.But the difficulty of manganese oxide is easy to destroy the structure of repeated charge and discharge, nanosheets are also easy to aggregate into clumps.
The team dispersed MnO2 nanosheets in solution and mixed them with graphene to synthesize an interactive multilayer composite with both negatively charged manganese oxide and graphene, which often repel each other. The team passed as early as 2015 Chemically modified graphene to make it positively charged, to solve the problem of rejection, and to achieve the maximum capacity and longest life of the metal oxide cathode material.
By compounding the two substances at the molecular level, it is difficult to achieve the unique properties of a single material.Compound materials can be used not only for rechargeable batteries but also greatly improve the performance of energy storage and conversion systems such as supercapacitors and electrode catalysts.
Research results published in the recent Journal of the American Chemical Society "ACS Nano" online version.
