磷酸铁锂材料的碳层构筑问题在文献中众说纷纭，难以把握具体细节。然而，倍率性能和循环性能是锂电材料的重要电化学性能，因此通过倍率性能和循环性能的测试，来理清单质型碳源和化合物型碳源的作用区别，同时对碳含量、碳化条件的影响开展研究。探讨了单质型(纳米石墨粉、乙炔黑)和化合物型(羟乙基纤维素、聚乙二醇2000、葡萄糖)碳源对 LiFe-PO4/C电化学性能的影响。实验结果表明，葡萄糖和纳米石墨粉的综合性能优于其它碳源；使用同一种碳源时，碳含量和煅烧温度对材料高倍率性能的影响显著大于对低倍率性能的影响；碳含量和煅烧温度一定时，碳源种类对LiFePO4/C的低倍率初始性能有所影响，对其低倍率循环性能有较为显著的影响，对其高倍率性能则有非常显著的影响。
There are many literature about the construction issues of LiFePO4 ’s carbon coating,of which is dif-ficult to figure out the relevant details.However,the rate-discharge and cyclic performances are important for lithium-ion battery materials.Thus we conducted tests on the rate-discharge and cyclic performances to tell the differences between the functions of element-type and compound-type carbon sources and,in the mean time,to study the effects of carbon content as well as carbonization condition.The effects of element-type carbon sources (i.e,graphite nanopowder and acetylene black)and compound-type carbon sources (i.e,hydroxyethyl cellulose, polyethyleneglycol 2000 and glucose)on the electrochemical performance of LiFePO4/C were investigated.The bench research produced following results.The overall performances of glucose and graphite nanopowder are better than other carbon sources.In the case of using a certain carbon source,both carbon content and calcina-tions temperature have much more significant effects on the materials’high-rate performances than their low-rate performances.In the case of using a certain carbon content and a certain calcinations temperature,the fac-tor of carbon source has effects to some extent on the initial low-rate performances of LiFePO4/C composites, has a little more significant effects on their low-rate cyclic performances,and has very significant effects on their high-rate performances.
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