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首页> 外文期刊>RSC Advances >Facile synthesis of selenium/potassium tartrate derived porous carbon composite as an advanced Li-Se battery cathode
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Facile synthesis of selenium/potassium tartrate derived porous carbon composite as an advanced Li-Se battery cathode

机译：硒/酒石酸钾钾盐衍生的多孔碳复合材料的轻松合成，作为先进的锂硒电池正极

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摘要

Porous carbon with a unique 3D structure has been prepared by the immediate carbonization of potassium tartrate. At an optimal carbonization temperature of 700 degrees C, the carbon mainly composed of micro- and small meso-porous structure has a Brunauer-Emmett-Teller (BET) specific surface area of 816.2 m(2) 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 similar to 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.
机译：通过酒石酸钾的立即碳化已经制备了具有独特的3D结构的多孔碳。在700摄氏度的最佳碳化温度下，主要由微孔和小孔构成的碳的Brunauer-Emmett-Teller（BET）比表面积为816.2 m（2）g（-1），而具有无定形结构的元素Se被均匀地封装在碳的多孔结构中。复合物中Se的重量比可以达到约50％。作为锂硒电池正极，复合材料显示出（第二次）可逆放电容量为550.5 mA hg（-1），在0.24C时的初始库伦效率为68.2％，放电容量为485.3 mA hg（-1）可以在80个循环后保留。即使在1.2C的高电流密度下，电池也可提供约452.3 mA h g（1）的稳定放电容量。所制备的复合材料的良好电化学性能可归因于高比表面积和小孔尺寸。

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