堆积
图层(电子)
六方晶系
锂(药物)
金属锂
材料科学
离子
金属
电池(电)
金属有机骨架
无机化学
逐层
电极
纳米技术
化学工程
结晶学
化学
吸附
有机化学
冶金
物理化学
阳极
医学
功率(物理)
物理
量子力学
内分泌学
工程类
作者
Wataru Kosaka,Nawo Eguchi,Taku Kitayama,Ryuta Sato,Ryota Nakao,Yoshihiro Sekine,Shinya Hayami,Kouji Taniguchi,Hitoshi Miyasaka
标识
DOI:10.1021/acs.chemmater.3c02671
摘要
Cathode materials for lithium-ion battery (LIB) cells present a fascinating target for applications in metal–organic frameworks (MOFs). While the framework moiety of MOFs acts as an electron container involving redox reactions, the pores store Li+ ions in MOF-incorporating LIBs. Thus, in addition to the redox potential and electron-conjugating nature of the framework, the path features for Li+-ion migration between the frameworks are closely associated with the LIB performance. Herein, we demonstrate the impact of porosity on the LIB performance using a series of charge-neutral layered MOFs, [FeII2(X2An)2(bpym)] (X = F, 1; Cl, 2; Br, 3; X2An2– = 2,5-dihalogeno-3,6-dihydroxy-1,4-benzoquinonate; bpym = 2,2′-bipyrimidyl), as cathode materials for LIBs. All compounds have a similar layered structure with the same electronic state; however, 1 has an eclipsed layer-stacking, whereas the isostructural 2 and 3 have polymorphic staggered structures, which results in one-dimensional channel paths in 1 and isolated pores in 2 and 3. The battery capacity was not dependent on the compound at low current densities but was largely affected by the stacking manner at high current densities and overpotentials: owing to the 1D channel that offers a good diffusion path for lithium ions, 1 exhibited desirable characteristics for LIBs.
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