We report the synthesis of Cut cubes with well-defined size and shape by thermal treatments of Cu2O cubes. Polydopamine （PDA） is introduced to modify the Cut cubes by the in-situ polymerization of the dopamine precu...We report the synthesis of Cut cubes with well-defined size and shape by thermal treatments of Cu2O cubes. Polydopamine （PDA） is introduced to modify the Cut cubes by the in-situ polymerization of the dopamine precursor. The initial specific ca- pacity of the lithium-ion batteries using the Cut cubes as anodes increases about 10 times at a 0.5 C rate as a result of the modification of PDA. The overall specific capacity for 100 cycles also increases effectively due to the introduction of PDA. So PDA as surface modifying agent significantly improves the electrochemical performance of the Cut anodes.展开更多
冷烧结(CSP)工艺是近年来新兴的一种高效、节能的材料方法。本工作采用CSP工艺,制备出致密度不低于97%的(1–x)BNT–x NN电介质陶瓷。研究了CSP工艺和Na Nb O_(3)含量对(1–x)BNT–x NN复相陶瓷的密度、相结构、显微形貌和介电性能的影...冷烧结(CSP)工艺是近年来新兴的一种高效、节能的材料方法。本工作采用CSP工艺,制备出致密度不低于97%的(1–x)BNT–x NN电介质陶瓷。研究了CSP工艺和Na Nb O_(3)含量对(1–x)BNT–x NN复相陶瓷的密度、相结构、显微形貌和介电性能的影响。结果表明:CSP工艺由于烧结温度低、保温时间短,可以显著降低晶粒尺寸,有效抑制Bi、Na等元素挥发,从而提高介电常数,降低介电损耗。随着Na Nb O_(3)含量的增加,(1–x)BNT–x NN复相陶瓷的剩余极化强度显著降低,并且介电常数的温度稳定性显著提升。当x=0.3时,0.7BNT–0.3NN陶瓷样品在25℃至400℃宽温范围内介电常数的变化率小于±6%,介电损耗小于5%,这表明CSP技术制备的(1–x)BNT–x NN陶瓷有望应用于温度稳定性陶瓷电容器。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.21573263)Jiangsu Provincial Science Foundation of China(Grant No.BK20151236)
文摘We report the synthesis of Cut cubes with well-defined size and shape by thermal treatments of Cu2O cubes. Polydopamine （PDA） is introduced to modify the Cut cubes by the in-situ polymerization of the dopamine precursor. The initial specific ca- pacity of the lithium-ion batteries using the Cut cubes as anodes increases about 10 times at a 0.5 C rate as a result of the modification of PDA. The overall specific capacity for 100 cycles also increases effectively due to the introduction of PDA. So PDA as surface modifying agent significantly improves the electrochemical performance of the Cut anodes.
文摘冷烧结(CSP)工艺是近年来新兴的一种高效、节能的材料方法。本工作采用CSP工艺,制备出致密度不低于97%的(1–x)BNT–x NN电介质陶瓷。研究了CSP工艺和Na Nb O_(3)含量对(1–x)BNT–x NN复相陶瓷的密度、相结构、显微形貌和介电性能的影响。结果表明:CSP工艺由于烧结温度低、保温时间短,可以显著降低晶粒尺寸,有效抑制Bi、Na等元素挥发,从而提高介电常数,降低介电损耗。随着Na Nb O_(3)含量的增加,(1–x)BNT–x NN复相陶瓷的剩余极化强度显著降低,并且介电常数的温度稳定性显著提升。当x=0.3时,0.7BNT–0.3NN陶瓷样品在25℃至400℃宽温范围内介电常数的变化率小于±6%,介电损耗小于5%,这表明CSP技术制备的(1–x)BNT–x NN陶瓷有望应用于温度稳定性陶瓷电容器。
