中文摘要：

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（Li FePO4）颗粒的Li Fe PO4/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 m Ah·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。

英文摘要：

Li Fe PO4（ 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 microscopy（ SEM） demonstrated that the LFP particles with the diameter ranging from several nanometers to one micron were connected by electric bridge and the LFP particles could be well modulated by varying the amount of the CNTs and binder. The LFP/CNTs composite prepared using 4 wt%CNTs and 5 wt%PVDF exhibited the best electrochemical property with capacity of 137 m Ah·g-1and high capacity retention of 95% at 0. 25 C 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.