The International Journal of Applied Chemistry (Angewandte Chemie International Edition) recently published an article in which the research on the "intermediate state" structure and transmission characteristics of lithium iron phosphate (LiFePO4) lithium batteries has made new progress. .
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Researchers at two universities, the University of Tokyo and the Tokyo Institute of Technology, said the results of the study helped speed up the reaction of lithium batteries and drastically shortened battery charging time.
Lithium battery intermediate state
Earlier researchers found that the existence of "intermediate state" can accelerate the charge and discharge reaction of the battery, but there is not enough experimental evidence to support it. Later studies have shown that because of the short life of the "intermediate state", The possibility of a systematic investigation of the reaction principle is minimal.
A team led by Atsou Yamada, a professor at the University of Tokyo's Institute of Engineering, found that the electrons were covered with a striped film layer, and the lithium ions and the striped film layer did not interfere with each other. In addition, the "intermediate state" lithium/electron conductivity is higher than the state of charge or discharge.
The researchers explained that lithium ions and electrons move faster because of the "intermediate state" condition, so they can accelerate the charge and discharge reaction of lithium batteries.
Atsuo Yamada said that once the "intermediate state" lifespan has been extended, the synthesis conditions in the battery reaction will also be optimized. At present, the team has successfully stabilized the “intermediate state†content at 100%, which is conducive to improving the conductivity. With the new research program, the development of fast-charging batteries will also usher in new breakthroughs.
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