Benzo-Dipteridine Derivatives as Organic Cathodes for Li- and Na-ion Batteries.
Benzo-Dipteridine Derivatives as Organic Cathodes for Li- and Na-ion Batteries.
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DOI：
10.1021/acsaem.0c00829
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发表时间：
2020-09-28
影响因子：
6.4
通讯作者：
Cooke G
中科院分区：
文献类型：
--
作者：
Cariello M;Johnston B;Bhosale M;Amores M;Wilson E;McCarron LJ;Wilson C;Corr SA;Cooke G
用于锂离子和钠离子电池的有机基电极为常用的无机电极提供了有吸引力的替代品，这些电极通常会带来供应链风险，热失控的安全问题以及不利的环境影响。通过对官能团的控制来化学引导有机电极的结构的能力是特别重要的，因为这提供了微调电化学性能参数的途径。在这里，我们报告了两个苯并双蝶啶衍生物，BF-Me 2和BF-H2，作为高容量电极用于锂离子和钠离子电池。这些部分允许每个分子结合多个Li离子，同时确保在支持电解质中的低溶解度，这通常是有机电极的一个排除问题。两者都显示出优异的电化学稳定性，在C/10倍率下100次循环后的放电容量为142和182 mAh g-1，BF-Me 2和BF-H2的库仑效率分别为96%和100%。Na离子电池的应用也已被证明，在100次循环后，在C/2倍率下，BF-Me 2和BF-H 2的放电容量分别为88.8和137 mAh g-1。这项工作为这些和相关结构提供了一个令人鼓舞的先例，以提供多功能，高能量密度和长循环寿命的电化学储能材料。
Organic-based electrodes for Li- and Na-ion batteries present attractive alternatives to commonly applied inorganic counterparts which can often carry with them supply-chain risks, safety concerns with thermal runaway, and adverse environmental impact. The ability to chemically direct the structure of organic electrodes through control over functional groups is of particular importance, as this provides a route to fine-tune electrochemical performance parameters. Here, we report two benzo-dipteridine derivatives, BF-Me2 and BF-H2, as high-capacity electrodes for use in Li- and Na-ion batteries. These moieties permit binding of multiple Li-ions per molecule while simultaneously ensuring low solubility in the supporting electrolyte, often a precluding issue with organic electrodes. Both display excellent electrochemical stability, with discharge capacities of 142 and 182 mAh g–1 after 100 cycles at a C/10 rate and Coulombic efficiencies of 96% and ∼ 100% demonstrated for BF-Me2 and BF-H2, respectively. The application of a Na-ion cell has also been demonstrated, showing discharge capacities of 88.8 and 137 mAh g–1 after 100 cycles at a C/2 rate for BF-Me2 and BF-H2, respectively. This work provides an encouraging precedent for these and related structures to provide versatile, high-energy density, and long cycle-life electrochemical energy storage materials.
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影响因子：
9.5
作者：
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DOI：
10.1073/pnas.1717892115
发表时间：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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