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Recently, the Japan Institute for Material Materials Research (NIMS) announced that one of their research groups successfully synthesized manganese oxide nanosheets and graphene alternating overlapping materials
.
As the anode material of lithium and sodium-ion rechargeable batteries, the composite material can increase the charging and discharging capacity of the battery by more than two times, and can extend the repeated service life, solving the problem that
capacity and life cannot be combined.
High capacity is one of the goals of secondary batteries, and at present, carbon materials are used for the negative electrode, and the transition metal oxides theoretically have high capacity, which is expected to become an alternative to carbon materials
.
In particular, manganese oxide, which has a layered structure, is stripped off into a single-molecule thick nanosheet, which is used as a negative electrode, and the surface is all active, which can greatly increase the capacity
.
However, the difficulty of manganese oxide is that repeated charging and discharging is easy to destroy the structure, and the nanosheets are easy to condense into clumps
.
The team dispersed the manganese oxide nanosheets in solution and mixed them with graphene to synthesize an intertwined laminated composite
.
Both manganese oxide and graphene are negatively charged and usually repel
each other.
As early as 2015, the research team solved the repulsion problem by chemically modifying graphene to make it positively charged, and achieved the highest capacity and longest lifetime
among metal oxide anode materials at that time.
By combining the two substances from the molecular level, high characteristics
that are difficult to achieve with individual materials have been obtained.
In addition to rechargeable batteries, composite materials can greatly improve the efficiency of energy storage and conversion systems such as supercapacitors and electrode catalysts
Recently, the Japan Institute for Material Materials Research (NIMS) announced that one of their research groups successfully synthesized manganese oxide nanosheets and graphene alternating overlapping materials
.
As the anode material of lithium and sodium-ion rechargeable batteries, the composite material can increase the charging and discharging capacity of the battery by more than two times, and can extend the repeated service life, solving the problem that
capacity and life cannot be combined.
High capacity is one of the goals of secondary batteries, and at present, carbon materials are used for the negative electrode, and the transition metal oxides theoretically have high capacity, which is expected to become an alternative to carbon materials
.
In particular, manganese oxide, which has a layered structure, is stripped off into a single-molecule thick nanosheet, which is used as a negative electrode, and the surface is all active, which can greatly increase the capacity
.
However, the difficulty of manganese oxide is that repeated charging and discharging is easy to destroy the structure, and the nanosheets are easy to condense into clumps
.
The team dispersed the manganese oxide nanosheets in solution and mixed them with graphene to synthesize an intertwined laminated composite
.
Both manganese oxide and graphene are negatively charged and usually repel
each other.
As early as 2015, the research team solved the repulsion problem by chemically modifying graphene to make it positively charged, and achieved the highest capacity and longest lifetime
among metal oxide anode materials at that time.
By combining the two substances from the molecular level, high characteristics
that are difficult to achieve with individual materials have been obtained.
In addition to rechargeable batteries, composite materials can greatly improve the efficiency of energy storage and conversion systems such as supercapacitors and electrode catalysts
