A new cathodic material that can charge a cellphone battery, which can be used for about 2hours, in just a minute is developed.
Although anodic material is also developed, its announcement will be made after about a month.
KAIST (Korea Advanced Institute of Science) made an announcement on the 20th that a research team led by Professor Kang Jeong-ku and Kim Yong-hoon of Graduate School of EEWS has developed a cathodic material for lithium-ion battery that can perform ultra-fast charge and discharge and have no loss in its capacity even if it operates more than 10,000 times.
This research was led by Lee Kyu-heon, Lee Jeong-woo, and Choi Ji-il who are researchers from EEWS. Result of this research was published on Advanced Functional Materials, which is an international scientific journal, on the 18th of May.
A research team has succeeded in developing a mixed structure, which is formed with 6nm TiO2 particle and 3D net-typed graphene, through a simple process.
“We have solved a problem where high-output performance, which is originally stored within a carbon-based electrode, is limited.” said Lee Kyu-heon. “We have succeeded in charging and discharging 130mAh/g completely within a minute.”

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<Structure of TiO2 thin film, which forms mesoporous, evaporated on top of graphene in a form of 3D net. A research team utilized this structure to develop a cathodic material for batteries that can perform ultra-fast charge and discharge. >

130mAh/g is a capacity that a normal cellphone can use within 2 hours.
This new material can also operate more than 10,000 times without any loss in capacity.
“Cathodic material is already developed and we are also planning to introduce a new anodic material through a thesis after about a month.” said Professor Kang Jeong-ku. “They can be used in fields such as electric vehicles, portable devices and others that require high output and long lifespan.
Graphene is currently used the most as a cathodic material for batteries. Although a method that separates graphite in a solution is used to easily manufacture graphenes, there are a lot of flaws during this method and it impedes in increasing conductivity of electricity due to impurity on surface.
To solve this problem, a research team has developed 3D net-typed graphene by using chemical vapor deposition. By covering TiO2 nano-particle thin film, which is mesoporous, it was able to develop a mixed structure.
“Because this structure uses a small nano-particle, distance from the center to surface is very short.” said Choi Ji-il. “Because lithium can be inserted into an entire crystal in short time, energy can be saved effectively even in a rapid speed of charge and discharge.”
This research was carried out with support from Ministry of Science, ICP and Future Planning’s Global Frontier Project, National Research Foundation of Korea’s Launching Project, and KISTI’s (Korea Institute of Science and Technology Information) Super Computing.
Staff Reporter Park, Heebeom | hbpark@etnews.com