Naphthalene energy has been developed for lithium battery anode materials The capacitance is twice as high as that of graphite electrodes

A joint research team at Tohoku University and the University of Tokyo has developed a negative electrode material
for all-solid-state lithium-ion batteries for the first time using the macrocyclic organic molecule naphthalene, a raw material for household insect repellents.
The negative electrode made of this new material (CNAP) has two times higher capacitance than graphite electrodes and can still maintain its original large-capacity state
after 65 flushes.

Rechargeable lithium-ion batteries have become an indispensable energy storage technology in life, and mobile phones, laptops, electric vehicles, etc.
are inseparable from lithium-ion batteries
.
At present, among the various rechargeable batteries, lithium-ion batteries can provide the largest
capacitance.
Due to the huge market demand, researchers from various countries are rushing to develop the basic materials of lithium-ion batteries, and negative electrode materials are particularly important
.

With its light weight and large capacity, graphite has become the first choice
for negative electrode materials.
Recently, the emergence of new nanocarbon materials represented by graphene and carbon nanotubes has expanded the capacitance of negative electrode carbon materials by 2 to 3 times
.
However, nanocarbon is a mixture of various structures, and scientists have not yet figured out the principle of its large-capacity, which has become an obstacle
to the development of nanocarbon negative electrodes.

The CNAP developed by the joint research team makes large cyclic organic molecules a large-capacity electrode material
for lithium-ion batteries by opening nanoscale pores in the central part of the molecule.
There is currently no precedent
for using macrocyclic organic molecules as the anode of lithium-ion batteries.
The team also found that the secret to making large-capacity lithium batteries lies in the pores processed in the molecular material, and based on this discovery, the researchers chemically converted naphthalene, which was originally used as an insect repellent, into a large-capacity battery material
.

The results of this research are part of Japan's "Elemental Strategy" and have been highly evaluated
.
In the future, the research team will precisely design atoms and molecules of various carbon materials to develop better materials
.
The research results were published in
the international academic journal Small.