The Japan Material Research Institute (NIMS) announced a few days ago that one of their research groups has succeeded in synthesizing materials with alternately overlapping manganese oxide nanoplatelets and graphene. The composite material, which is a negative electrode material for lithium and sodium ion rechargeable batteries, can increase the charge and discharge capacity of the battery by more than two times, and can prolong the repetitive service life, thereby solving the problem that both the capacity and the life cannot be achieved.
High capacity is one of the goals of secondary batteries. At present, the negative electrode uses a carbon material. Theoretically, the transition metal oxide has a high capacity and is expected to become a substitute for a carbon material. In particular, manganese oxides having a layered structure are peeled off into single-molecule thick nanosheets. When used as a negative electrode, the entire surface is active and the capacity can be significantly increased. However, the difficulty of manganese oxide is that repeated charging and discharging easily break the structure, and nanoplatelets tend to agglomerate.
The research team disperses the manganese oxide nanoplates in the solution and mixes them with graphene to synthesize a multilayer laminated composite material. Manganese oxide and graphene are both negatively charged and usually repel each other. The research team had positively charged the graphene by chemically modifying graphene as early as 2015, solved the problem of repulsion, and achieved the highest capacity and longest lifetime of metal oxide anode materials at that time.
This time, by combining the two substances at the molecular level, the high properties that are difficult to achieve with individual materials are obtained. In addition to the use of rechargeable batteries, composite materials can significantly increase the efficiency of energy storage and conversion systems such as supercapacitors and electrode catalysts.
The research results were published in the recent edition of the American Chemical Society magazine ACS Nano. (Reporter Chen Chao)
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