Comprehensive Summary This work systematically reviews recent progresses in the applications of MOF-derived materials modified 3D porous conductive framework as hosts for uniform lithium deposition in LMBs.A series of...Comprehensive Summary This work systematically reviews recent progresses in the applications of MOF-derived materials modified 3D porous conductive framework as hosts for uniform lithium deposition in LMBs.A series of commonly used lithiophilic materials and several kinds of representative MOF-derivation-modified 3D hosts as lithium metal anode(LMA)are presented.Finally,the challenges and future development of employing MOF-derived materials to modify the 3D porous conductive framework for LMA are included.展开更多
锂硫电池中多硫化锂的“穿梭效应”、单质硫导电性差等问题导致其寿命短、倍率性能差,严重限制了其实际应用.基于此,本文采用溶胶凝胶法合成了尖晶石型Li_(2)MnTi_(3)O_(8)(LMTO)纳米颗粒,将其同时作为硫宿主材料和功能隔膜涂层,极大地...锂硫电池中多硫化锂的“穿梭效应”、单质硫导电性差等问题导致其寿命短、倍率性能差,严重限制了其实际应用.基于此,本文采用溶胶凝胶法合成了尖晶石型Li_(2)MnTi_(3)O_(8)(LMTO)纳米颗粒,将其同时作为硫宿主材料和功能隔膜涂层,极大地提升了锂硫电池的循环稳定性和Li+的扩散速率.均匀分散的LMTO纳米颗粒不仅能提供丰富的电化学活性位点,同时可减少活性硫的损失.此外,LMTO功能化隔膜具有吸附多硫化锂的能力,有效抑制了多硫化锂的穿梭.实验结果表明,以LMTO为硫宿主材料和功能隔膜涂层组装的锂硫电池在充放电过程中展现了较快的锂离子扩散速率(DLi+分别为2.25×10^(−5),1.31×10^(−5)和1.61×10^(−4)cm^(2)s^(−1)),表明其快速的反应动力学.在0.5 C的电流密度下,电池首次放电比容量可达到1059 mAh g^(−1),经过300次循环,容量稳定在797 mAh g^(−1).双功能改性后的电池性能均优于单功能改性的电池.该材料的双功能应用策略为开发高容量、长寿命的锂硫电池提供了理论支持.展开更多
基金the National Natural Science Foundation of China(Nos.21701083 and 22179054).
文摘Comprehensive Summary This work systematically reviews recent progresses in the applications of MOF-derived materials modified 3D porous conductive framework as hosts for uniform lithium deposition in LMBs.A series of commonly used lithiophilic materials and several kinds of representative MOF-derivation-modified 3D hosts as lithium metal anode(LMA)are presented.Finally,the challenges and future development of employing MOF-derived materials to modify the 3D porous conductive framework for LMA are included.
文摘锂硫电池中多硫化锂的“穿梭效应”、单质硫导电性差等问题导致其寿命短、倍率性能差,严重限制了其实际应用.基于此,本文采用溶胶凝胶法合成了尖晶石型Li_(2)MnTi_(3)O_(8)(LMTO)纳米颗粒,将其同时作为硫宿主材料和功能隔膜涂层,极大地提升了锂硫电池的循环稳定性和Li+的扩散速率.均匀分散的LMTO纳米颗粒不仅能提供丰富的电化学活性位点,同时可减少活性硫的损失.此外,LMTO功能化隔膜具有吸附多硫化锂的能力,有效抑制了多硫化锂的穿梭.实验结果表明,以LMTO为硫宿主材料和功能隔膜涂层组装的锂硫电池在充放电过程中展现了较快的锂离子扩散速率(DLi+分别为2.25×10^(−5),1.31×10^(−5)和1.61×10^(−4)cm^(2)s^(−1)),表明其快速的反应动力学.在0.5 C的电流密度下,电池首次放电比容量可达到1059 mAh g^(−1),经过300次循环,容量稳定在797 mAh g^(−1).双功能改性后的电池性能均优于单功能改性的电池.该材料的双功能应用策略为开发高容量、长寿命的锂硫电池提供了理论支持.
