羧甲基纤维素包覆天然石墨性能的研究

Study on the performance of resin/graphite composite coated by carboxymethyl cellulose

本实验研究了羧甲基纤维素(CMC)包覆对天然石墨电化学性能的影响。通过XRD、恒电流充放电测试手段研究了不同包覆量对该复合材料结构和电化学性能的影响。结果表明:羧甲基纤维素裂解炭对天然石墨有较好的包覆作用,并且能够有效的阻止石墨在充放电过程中发生层状剥落现象,从而有效的提高复合炭材料的循环稳定性,其中5%树脂包覆量的复合材料在循环50次之后可逆容量是310.9 mAh.g-1,比天然石墨高50 mAh.g-1,并保持了首次可逆容量的97.1%。

CMC/graphite composite was prepared by mixing graphite and CMC in distilled water, carbonizing at 900℃ under N2 after removing solvent. The morphology structure and charge- discharge performance were investigated using XRD and constant- current charge- discharge experiments. The results showed that the pyrolytic carbon released form CMC could cover graphite satisfactorily and the disordered structure of pyrolytic carbon on the surface of graphite can successfully protect the graphite form exfoliation to improve its cyclic perfonnances. After fifty time cycles, the reversible capacity of composite which pyrolytic carbon was 5 % prepared by sediment was 310.9 mAh·g^-1 which was 50 mAh·g^-1 higher than that of graphite （260.9 mAh·g^-1 ）, remaining 97.1% of its first reversible capacity.