Cobalt oxide nanosheet electrodes to enhance batteries

07-May-2013 - China

A graphene inspired electrode material that could help batteries hold more power has been developed by Chinese scientists. The large surface area of these cobalt oxide nanosheets is key to their electrochemical performance.

As technology advances, the search is on for batteries that can pack more energy into the same space.  Graphitic electrodes are commonly used in lithium ion batteries but suffer from low theoretical capacity. A viable alternative is to use metal oxides which have significantly higher theoretical capacities but in practice are limited by their inability to hold more lithium ions. Recently nanostructures have been developed that can hold more lithium ions but the swelling and shrinking from charge–discharge cycles damages the electrode and greatly reduces its capacity, a problem known as pulverisation.

The team from the University of Science and Technology of China, Hefei, have bypassed these issues using an inorganic analogue of graphene. They fabricated atom-thick sheets of cobalt oxide via a topochemical method. The structure of the analogue allows for huge surface areas, facile lithium ion diffusion and electron transport, as well as open channels that buffer large volume variation during cycling processes. All of these factors contribute to its significant electrochemical performance and high cyclability in comparison with previous Co3O4 nanostructures.

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Topic World Battery Technology

The topic world Battery Technology combines relevant knowledge in a unique way. Here you will find everything about suppliers and their products, webinars, white papers, catalogs and brochures.

25+ products
150+ companies
30+ whitepaper
20+ brochures