Preparation of Carbon Microspheres as Anode Materials for Lithium-Ion Batteries

以芘基热固性树脂和聚乙二醇为原料，在酸性催化剂存在下，通过加热搅拌制备了多孔树脂基微球。树脂的低聚合度是影响微球粒径的主要因素，此时微球的粒径在1-2 μ m之间。微球为表面有开放裂隙的聚集体。将1000 ~ 2500 ℃热处理的碳微球作为电池负极材料进行了评价，并与石墨的结果进行了比较。在100 ~ 2000 mA/g的电流密度下，石墨阳极的放电比容量迅速下降至10%.另一方面，碳球阳极的那些仅下降至47%。这些结果表明，这些碳球具有几种可能性，如快速充电和高放电电容。

Porous resin-based microspheres were prepared from the mixture of pyrene-based thermosetting resin and polyethylene glycol in a presence of acid catalyst by heating and stirring. The low polymerization degree of the resin was much important and then the particle size of the microspheres were 1-2 micrometer. The microspheres seemed to be the aggregates with open cleft on the surfaces. The carbon microspheres heat-treated at 1000 to 2500 degree C were evaluated as anode materials for batteries, compared with the results of graphite. Specific discharge capacities of graphite anode rapidly decreased down to 10 % at 100 to 2000 mA/g as a current density. On the other hand, those of carbon sphere anodes decreased only down to 47 %. These results suggest that those carbon spheres have several possibilities such as rapid charging and high discharge capacitance.