Powering Batteries With Carbon

Powering Batteries With Carbon

Author: Anne Deveson

The increasing need of rechargeable power batteries in emerging electric vehicles and hybrid electric vehicles has spurred tremendous research effort in developing lithium-ion batteries with high reversible capacity and fast charge–discharge capability. In the search for advanced anode materials, porous carbons with a large number of Li-ion storage active sites and a loose skeleton structure (vs. graphite) are attracting much interest due to their high available capacity and negligible volumetric expansion.

An-Hui Lu and his group at the Dalian University of Technology, China, have prepared a new type of porous carbon material by using an organic–inorganic–surfactant co-assembly method with silica and poly-benzoxazine as building blocks, followed by the removal of silica. These materials have a controllable mesopore/micropore volume ratio. When used as an anode material for a lithium-ion battery, a high reversible capacity of 660 mAh g–1 was observed even after 70 cycles at a current density of 100 mA g–1, and good rate performance.

Overall a new and easy synthesis method for porous carbons with a bimodal pore system is reported. Such materials are likely to find many applications in electrochemical energy storage.


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