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Recently, Jianyu Huang of Sandia National Laboratory in the United States and his research team announced that they had successfully developed the world's smallest nanolithium-ion battery. The rechargeable lithium-ion battery was made under a projection electron microscope of the Center for Inductive Nanotechnology (CINT).

The anode of the nanometer lithium ion battery is composed of a piece with a diameter of 100 nm and a length of 10μ M of tin dioxide nanowires, only 1/7000 of the thickness of human hair, the nanobattery is also composed of 3mm long lithium cobalt oxide cathode and ionic liquid electrolyte, which is assembled under the projection electron microscope.

The researchers initially hoped to use it to deeply understand the atomic structure changes of lithium-ion batteries during charging and discharging, so as to find out how to improve the output power and energy density of lithium-ion batteries. During the study, they unexpectedly found that the length of tin dioxide nanowires almost doubled during the charging process, instead of stretching the width as previously predicted. Such findings will help to improve the planning of lithium-ion batteries and prevent the internal short circuit that leads to the shortening of battery life.

It was found that the change of the anode of the nano lithium ion battery before and after charging was unknown.

Jianyu Huang, who is in charge of the research project, said that the manufacturing method of ultra-miniature batteries developed by them can stimulate more research on the manufacturing of micro batteries, so as to have a more comprehensive understanding of the mechanism controlling the performance and reliability of batteries. The charging density and energy efficiency of lithium ion batteries based on nanowires will be significantly higher than that of existing lithium ion batteries. In the future, lithium ion batteries such as hybrid electric vehicles, laptops and mobile phones may benefit.

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