SiO2掺杂硬炭作锂离子电池负极材料的研究

SiO doped hard carbon as anode material for lithium ion batteries

以间苯二酚和甲醛合成间苯二酚甲醛树脂,并采用喷雾干燥法将纳米二氧化硅掺杂到间苯二酚甲醛树脂中,通过碳化法得到间苯二酚甲醛树脂基硬炭/二氧化硅复合材料RFHC/Si O2。以此材料作为锂离子电池负极材料对其电化学性能进行了研究。结果表明,复合材料RFHC/Si O2具有较大的比表面积(929.42 m2/g)和丰富的介孔结构,二氧化硅均匀分布在硬炭结构中;当SiO2质量分数为5%时,以复合材料RFHC/Si O2为锂离子电池的负极材料具有850 m A·h/g的高可逆容量,表现出良好的倍率性能。

RF/Si O2 composite material is prepared through spray drying technology to dope nano-silica into resorcinol formaldehyde resin that is synthesized from resorcinol and formaldehyde.Then resorcinol-formaldehyde resinbased hard carbon/silica composite material(RFHC/Si O2)is obtained by carbonization of RF/Si O2 composite material.Structural characterization shows that RFHC/Si O2 composite exhibits a large specific surface area of 929 m2·g-1 and rich mesoporous structure.Moreover,silica distributes uniformly in hard carbon structure.As RFHC/Si O2 composite containing 5%of Si O2 is used as anode materials for lithium ion batteries,it shows a reversible capacity as high as 850 m A·h·g-1,showing a good rate performance.