CAJ | 학술논문

采用简单、有效和可规模化的球磨工艺,原位合成了碳纳米管( CNTs)均匀分布且连接磷酸铁锂( LiFe-PO4)颗粒的LiFePO4/CNTs复合材料。该复合材料颗粒均匀,分散性好,粒径大约在200 nm~1μm之间,其分散和连接状态可由碳纳米管和粘结剂调控。当CNTs含量为4 wt%、PVDF含量为5 wt%时复合材料显示出最好的电化学性能。0．25C 条件下首次放电容量达137 mAh·g-1,50次循环后,容量仍保持在95%以上,,显示出良好的循环稳定性和可逆性。与没有添加CNTs的样品相比,CNTs网络结构极大地提高了活性物质的电导率,从而明显改善电化学性能。
채용간단、유효화가규모화적구마공예,원위합성료탄납미관( CNTs)균균분포차련접린산철리( LiFe-PO4)과립적LiFePO4/CNTs복합재료。해복합재료과립균균,분산성호,립경대약재200 nm~1μm지간,기분산화련접상태가유탄납미관화점결제조공。당CNTs함량위4 wt%、PVDF함량위5 wt%시복합재료현시출최호적전화학성능。0．25C 조건하수차방전용량체137 mAh·g-1,50차순배후,용량잉보지재95%이상,,현시출량호적순배은정성화가역성。여몰유첨가CNTs적양품상비,CNTs망락결구겁대지제고료활성물질적전도솔,종이명현개선전화학성능。
LiFePO4(LFP)microparticles connected homogeneously with three-dimensional(3D)carbon nanotube(CNT)conductive networks were successfully prepared via a simple,effective and high productivity by ball milling method. Scanning electron microsco-py( SEM) demonstrated that the LFP particles with the diameter ranging from several nanometers to one micron were connected by e-lectric bridge and the LFP particles could be well modulated by varying the amount of the CNTs and binder. The LFP/CNTs com-posite prepared using 4 wt%CNTs and 5 wt%PVDF exhibited the best electrochemical property with capacity of 137 mAh·g-1 and high capacity retention of 95%at 0. 25C after 50 cycles. Essentially,in comparison with those samples without CNT networks,this CNT network structure can greatly enhance the electrical conductivity,thus markedly improving the electrochemical performance.