Facile synthesis of selenium/potassium tartrate derived porous carbon composite as an advanced Li–Se battery cathode?

RSC Advances Pub Date: 2016-05-09 DOI: 10.1039/C6RA07837K

Abstract

Porous carbon with a unique 3D structure has been prepared by the immediate carbonization of potassium tartrate. At an optimal carbonization temperature of 700 °C, the carbon mainly composed of micro- and small meso-porous structure has a Brunauer–Emmett–Teller (BET) specific surface area of 816.2 m2 g?1, and the element Se with an amorphous structure is uniformly encapsulated into the porous structure of carbon. The weight ratio of Se in the composite can reach ～50%. As the Li–Se battery cathode, the composite shows a (2nd) reversible discharge capacity of 550.5 mA h g?1 with an initial coulombic efficiency of 68.2% at 0.24C, and a discharge capacity of 485.3 mA h g?1 can be retained after 80 cycles. Even at a high current density of 1.2C, the cell also delivers a stable discharge capacity of about 452.3 mA h g?1. The good electrochemical performances of the as-prepared composite may be attributed to high specific surface area and small porous size.

Graphical abstract: Facile synthesis of selenium/potassium tartrate derived porous carbon composite as an advanced Li–Se battery cathode
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