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No more leakage of explosive electrolytes in batteries

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Posted June 28, 2013
This is an image of the elastic behaviour of a cylindrical monolith of the gel electrolyte based on 2 wt. % PVA-CN in 1 M LiPF6 in 1:2 (vol.) EC:EMC as the base liquid electrolyte. Credit: UNIST

This is an image of the elastic behaviour of a cylindrical monolith of the gel electrolyte based on 2 wt. % PVA-CN in 1 M LiPF6 in 1:2 (vol.) EC:EMC as the base liquid electrolyte. Credit: UNIST

A research team at Ulsan National Institute of Science and Technology (UNIST), S. Korea, found a new physical organogel electrolyte with two unique characteristics: an irreversible thermal gelation and a high value of the Li+ transference number.

A Recent fire on a Boeing 787 on the ground in Boston, US, was caused by a battery failure, it resulted in the release of flammable electrolytes, heat damage and smoke. If they had used a safer electrolyte, the risk would have been reduced.

Electrolytes are essential components of supercapacitors, batteries and fuel cells. The Most widely used electrolyte is a liquid type since its overall ionic conductivity and value of transference numbers are better than solid-type electrolytes. However, safety concerns caused by its leakage and explosive nature, caused an extensive call for the research on the development of solid-type electrolyte.

The development of solid-type electrolytes, safe from explosion caused by high temperature and overcharge, is urgently needed to replace the liquid electrolytes. The solid electrolyte enables batteries to be safer as well as the use of higher energy electrode materials.

The most important parameter of electrolytes used in electrochemical cells is ionic conductivity. The use of solid-state electrolytes has been limited due to low ionic conductivity caused by their immobile matrix regardless of their own merits such as no leak, non-volatility, mechanical strength and processing flexibility.

Read more at: Phys.org

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