Wu Yifang, Chong Shaokun, Liu Yongning, Guo ShengWu, Wang Pengwei, Bai Lifeng, Li Chengshan
Northwest Institute for Nonferrous Metal Research Xi'an 710016 China
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University Xi'an 710049 China.
RSC Adv. 2018 Aug 14;8(51):28978-28986. doi: 10.1039/c8ra04119a.
Tris(pentafluorophenyl) borane (CBF) was first adopted as a boron source, which clearly demonstrated its modification effects. XPS and EDX mapping proved that boron can be successfully doped into a carbon layer. The high number of defects in the carbon induced by boron was demonstrated Raman spectroscopy and thus, the electric conductivity of LiFePO was greatly enhanced. The boron-doped composite possessed a higher specific discharge capacity and rate capability than the undoped sample. For instance, the reversible specific capacity for the boron-doped cathode reached 165.8 mA h g at 0.5C, which was almost close to its theoretical capacity (166 mA h g). Even at a high rate of 5C, it still possessed a high specific capacity of 124.8 mA h g. This provides for the possibility that boron-doped carbon-coated LiFePO cathodes may deliver high energy and power density for rechargeable lithium-ion batteries.
三（五氟苯基）硼烷（CBF）首次被用作硼源，这清楚地证明了其改性效果。X射线光电子能谱（XPS）和能量散射X射线光谱（EDX）映射证明硼可以成功地掺杂到碳层中。拉曼光谱表明硼在碳中诱导产生了大量缺陷，因此，磷酸铁锂（LiFePO）的电导率大大提高。与未掺杂样品相比，硼掺杂复合材料具有更高的比放电容量和倍率性能。例如，硼掺杂阴极在0.5C时的可逆比容量达到165.8 mA h/g，几乎接近其理论容量（166 mA h/g）。即使在5C的高倍率下，它仍然具有124.8 mA h/g的高比容量。这为硼掺杂碳包覆磷酸铁锂阴极可为可充电锂离子电池提供高能量和功率密度提供了可能性。
