Cu/Ti3AlC2 composite and functional-gradient materials with excellent electrical conductivity and thermal conductivity as well as good flexural properties were prepared by low-temperature spark plasma sintering of Cu ...Cu/Ti3AlC2 composite and functional-gradient materials with excellent electrical conductivity and thermal conductivity as well as good flexural properties were prepared by low-temperature spark plasma sintering of Cu and Ti3AlC2 powder mixtures. The phase compositions of the materials were analyzed by X-ray diffraction, and their microstructure was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy. Further, the electrical conductivity, thermal conductivity, and flexural properties of the materials were tested. Results show that, for the composite materials, the resistivity rises from 0.75 × 10^-7 Ω·m only to 1.32 × 10^-7 Ω·m and the thermal diffusivity reduces from 82.5 mm^2/s simply to 39.8 mm^2/s, while the flexural strength improves from 412.9 MPa to 471.3 MPa, as the content of Ti3AlC2 is increased from 5 wt%to 25 wt%. Additionally, the functional-gradient materials sintered without interface between the layers exhibit good designability, and their overall electrical conductivity, thermal conductivity, and flexural strength are all higher than those of the corresponding uniform composite material.展开更多
二硫化钼在可充电电池等能源存储领域具有广阔的应用前景,然而其电子导电性较差、充放电过程中易粉化和团聚等问题限制了其发展。采用水热法一步合成了液态合金(LM)和二硫化钼(MoS_(2))的复合负极材料(LM@MoS_(2))。通过XRD、SEM等综合...二硫化钼在可充电电池等能源存储领域具有广阔的应用前景,然而其电子导电性较差、充放电过程中易粉化和团聚等问题限制了其发展。采用水热法一步合成了液态合金(LM)和二硫化钼(MoS_(2))的复合负极材料(LM@MoS_(2))。通过XRD、SEM等综合表征方法对复合材料的结构和形态特性进行了研究。结果表明,液态合金通过静电吸附和配位键等方式有效结合于MoS_(2),形成稳定的复合结构。此外,复合材料具有较高的可变形性和化学稳定性,促进了电极材料裂纹表面的修复,减少了内部氧化还原反应,提高了锂离子电池的循环稳定性。当LM与MoS_(2)质量比为2:1时,复合材料表现出最佳性能。在0.1 A·g^(−1)的电流密度下,经过100次循环,复合材料的比容量稳定在656.1 m A·h·g^(−1),容量保持率达74.3%,该研究为锂离子电池电极的裂纹自修复提供了新思路。展开更多
基金Funded by he National Natural Science Foundation of China(51402097)the Open Foundation of Hubei Provincial Key Laboratory of Green Materials for Light Industry(201806A04)the College Students Innovation and Entrepreneurship Training Program of Hubei University of Technology(201810500151)
文摘Cu/Ti3AlC2 composite and functional-gradient materials with excellent electrical conductivity and thermal conductivity as well as good flexural properties were prepared by low-temperature spark plasma sintering of Cu and Ti3AlC2 powder mixtures. The phase compositions of the materials were analyzed by X-ray diffraction, and their microstructure was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy. Further, the electrical conductivity, thermal conductivity, and flexural properties of the materials were tested. Results show that, for the composite materials, the resistivity rises from 0.75 × 10^-7 Ω·m only to 1.32 × 10^-7 Ω·m and the thermal diffusivity reduces from 82.5 mm^2/s simply to 39.8 mm^2/s, while the flexural strength improves from 412.9 MPa to 471.3 MPa, as the content of Ti3AlC2 is increased from 5 wt%to 25 wt%. Additionally, the functional-gradient materials sintered without interface between the layers exhibit good designability, and their overall electrical conductivity, thermal conductivity, and flexural strength are all higher than those of the corresponding uniform composite material.
文摘二硫化钼在可充电电池等能源存储领域具有广阔的应用前景,然而其电子导电性较差、充放电过程中易粉化和团聚等问题限制了其发展。采用水热法一步合成了液态合金(LM)和二硫化钼(MoS_(2))的复合负极材料(LM@MoS_(2))。通过XRD、SEM等综合表征方法对复合材料的结构和形态特性进行了研究。结果表明,液态合金通过静电吸附和配位键等方式有效结合于MoS_(2),形成稳定的复合结构。此外,复合材料具有较高的可变形性和化学稳定性,促进了电极材料裂纹表面的修复,减少了内部氧化还原反应,提高了锂离子电池的循环稳定性。当LM与MoS_(2)质量比为2:1时,复合材料表现出最佳性能。在0.1 A·g^(−1)的电流密度下,经过100次循环,复合材料的比容量稳定在656.1 m A·h·g^(−1),容量保持率达74.3%,该研究为锂离子电池电极的裂纹自修复提供了新思路。
