竹碳的结构及电化学性能研究

Characterization and Electrochemical Performance of Bamboo Charcoal

用XRD、SEM和EDS对由天然竹子烧制而成的竹碳进行了组织结构表征。表明竹碳主要呈无定形碳结构 ,并含有钾等金属元素。对竹碳的电化学嵌脱锂性能进行了初步的研究 ,竹碳的首次嵌锂容量约 2 0 0mAh g ,但不可逆容量较大。除去竹碳中的钾等金属离子并进行球磨处理 ,竹碳的首次嵌锂容量超过 4 0 0mAh g ,经过几次充放电循环以后 ,处理后的竹碳显示出良好的充放电效率。

The microstructures of the bamboo charcoal were characterized by means of X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. The bamboo charcoal mainly presents amorphous carbon structure. Insides the bamboo charcoal, some other elements, such as O, K and Si were detected. Being used for the active anode material of lithium ion battery, the electrochemical insertion / extraction lithium properties of the bamboo charcoal were primarily investigated. The initial capacity of as-prepared bamboo charcoal is about 200 mAh/g. After treated by wiping off element K and ball milling, the initial capacity of the bamboo charcoal is over 400 mAh/g. In the charge-discharge cycle tests, the treated bamboo charcoal showed good charge-discharge efficiency after several cycles.