引入电解液添加剂是提升钠离子二次电池电化学性能的重要途径.本文制备了二氟草酸硼酸钠(NaDFOB),并作为NaClO_4/碳酸乙烯酯(EC)/碳酸丙烯酯(PC)(EC:PC体积比为1:1)非水电解液的添加剂,分别考察了其加入量对于电导率特性、电化学氧化分...引入电解液添加剂是提升钠离子二次电池电化学性能的重要途径.本文制备了二氟草酸硼酸钠(NaDFOB),并作为NaClO_4/碳酸乙烯酯(EC)/碳酸丙烯酯(PC)(EC:PC体积比为1:1)非水电解液的添加剂,分别考察了其加入量对于电导率特性、电化学氧化分解电压的影响,以及应用于Na Ni0.5Mn0.5O2半电池的电化学性能.结果表明,Na DFOB作为添加剂时对于NaClO_4/EC/PC电解液电导率提升不明显,但显著提升了电解液的氧化分解电压;以添加0.025 mol·L^(-1)Na DFOB的电解液应用于Na Ni0.5Mn0.5O2半电池时,首周不可逆比容量由22 m Ah·g^(-1)下降到9 m Ah·g^(-1),同时0.2C倍率下循环200周容量保持率由44.4%提升到89.5%,平均每周容量衰减为0.06 m Ah·g^(-1).因此,Na DFOB可以作为钠离子电池非水电解液的一种有效添加剂.展开更多
The ionic species in SnCl\-2-1-butylpytidinium chloride (BPC) ambient temperature molten salt electrolytes were investigated by using the computer simulation method. It was found that the Sn electrode potential was ch...The ionic species in SnCl\-2-1-butylpytidinium chloride (BPC) ambient temperature molten salt electrolytes were investigated by using the computer simulation method. It was found that the Sn electrode potential was changed suddenly at 50.0% mole fraction SnCl\-2. The major ionic specie in the 33.3%SnCl\-2 melt is SnCl\+-\-3 and that in the 66.6% SnCl\-2 melt is Sn\-2Cl\+-\-5. Both SnCl\+-\-3 and Sn\-2Cl\+-\-5 existed in the 50.0%SnCl\-2 melt.展开更多
文摘引入电解液添加剂是提升钠离子二次电池电化学性能的重要途径.本文制备了二氟草酸硼酸钠(NaDFOB),并作为NaClO_4/碳酸乙烯酯(EC)/碳酸丙烯酯(PC)(EC:PC体积比为1:1)非水电解液的添加剂,分别考察了其加入量对于电导率特性、电化学氧化分解电压的影响,以及应用于Na Ni0.5Mn0.5O2半电池的电化学性能.结果表明,Na DFOB作为添加剂时对于NaClO_4/EC/PC电解液电导率提升不明显,但显著提升了电解液的氧化分解电压;以添加0.025 mol·L^(-1)Na DFOB的电解液应用于Na Ni0.5Mn0.5O2半电池时,首周不可逆比容量由22 m Ah·g^(-1)下降到9 m Ah·g^(-1),同时0.2C倍率下循环200周容量保持率由44.4%提升到89.5%,平均每周容量衰减为0.06 m Ah·g^(-1).因此,Na DFOB可以作为钠离子电池非水电解液的一种有效添加剂.
文摘The ionic species in SnCl\-2-1-butylpytidinium chloride (BPC) ambient temperature molten salt electrolytes were investigated by using the computer simulation method. It was found that the Sn electrode potential was changed suddenly at 50.0% mole fraction SnCl\-2. The major ionic specie in the 33.3%SnCl\-2 melt is SnCl\+-\-3 and that in the 66.6% SnCl\-2 melt is Sn\-2Cl\+-\-5. Both SnCl\+-\-3 and Sn\-2Cl\+-\-5 existed in the 50.0%SnCl\-2 melt.