【摘要】 负极材料对锂离子电池的电化学性能至关重要。使用NaOH刻蚀得到无氟Ti₃C₂T_x（T=OH,O）材料并通过氮掺杂、水热原位生长SnO₂得到一种N-Ti₃C₂T_x/SnO₂复合材料用于锂离子电池的负极。SnO₂纳米粒子分散均一地锚固在高导电的N掺杂MXene骨架上,可以加速电子传输并缓冲SnO₂的团聚与体积膨胀,此外,SnO₂作为间隔物还可以减弱MXene纳米片的重新堆叠。电化学测试结果表明,在0.1, 0.2, 0.5, 1, 2和5 A/g电流密度下的质量比容量分别为485, 331, 243, 171, 132和97 mAh/g。0.5 A/g下经过200次循环后放电比容量仍能保持90.1%,体现了此新型负极材料在锂离子电池中的潜在应用前景。更多还原

【Abstract】 Anode materials have a significant influence on the electrochemical performance of lithium-ion batteries.Fluorine-free Ti₃ C₂ T_x（T=OH, O） material was obtained through using NaOH etching. Through nitrogen doping,hydrothermal in-situ growth of SnO₂, a N-Ti₃ C₂ T_x/SnO₂ composite material for the anode of lithium-ion batteries was obtained. SnO₂ nanoparticles were uniformly anchored on the highly conductive N-doped MXene framework, which accelerated electron transport and suppressed the agglomeration and volume expansion of SnO₂. In addition, SnO₂ as a spacer could also reduce the re-stacking of MXene nanosheets. The electrochemical test results show that the mass specific capacities at discharge rates of 0.1, 0.2, 0.5, 1, 2 and 5 A/g are 485, 331, 243, 171, 132 and 97 mAh/g,respectively. The capacity can remain about 90.1% after 200 cycles at a rate of 0.5 A/g, which shows the potential application of this new type of anode electrode material in lithium-ion batteries.更多还原