2D-Layered Lithium Carboxylate Based on Biphenyl Core as Negative Electrode for Organic Lithium-Ion Batteries
2D-Layered Lithium Carboxylate Based on Biphenyl Core as Negative Electrode for Organic Lithium-Ion Batteries
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DOI：
10.1021/acs.chemmater.6b03524
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发表时间：
2017-01-24
影响因子：
8.6
通讯作者：
Becuwe, Matthieu
中科院分区：
文献类型：
--
作者：
Fedele, Lionel;Sauvage, Frederic;Becuwe, Matthieu
通过结合粉末 X 射线衍射、二维固态 C-13 NMR 和高分辨率透射电子显微镜，合成并表征了基于 4,4'-联苯核的二维层状共轭有机羧酸锂。这些互补技术的结合可以识别固体内的分子堆积和结构组织。对这种新型有机负极的电化学性能进行了评估。 4,4'联苯框架提供的特定2D层赋予该材料前所未有的倍率性能，在2e(-)/小时速率下25个循环中保持高达180 mAh g(-1)，无需任何电极配方。这种电化学性能归因于介观晶体结构内锂传导的增强，这是由无机LiO4层之间更大的距离促进的，以及与基于羧酸盐的有机电极系列的其他成员相比，在锂插入期间维持无结构非晶化的循环时更大的结构鲁棒性。
A 2D-layered conjugated organic lithium carboxylate based on 4,4'-biphenyl core has been synthesized and characterized by combining powder X-ray diffraction, two-dimensional solid-state C-13 NMR, and high-resolution transmission electron microscopy. The combination of these complementary technics identifies both molecular packing and structural organization within the solid. The electro-chemical performances of this new organic negative electrode have been evaluated. The specific 2D-layer offered by the 4,4'biphenyl framework confers to the material an unprecedented rate capability, maintaining as high as 180 mAh g(-1)over 25 cycles at 2e(-)/hour rate without any means of electrode formulation. Such electrochemical performances are ascribed at once to the enhancement of lithium conduction inside mesoscopic crystal structure, promoted by the greater distance between the inorganic LiO4 layers and to the greater structural robustness upon cycling sustaining no structural amorphization during lithium insertion by contrast to the other members of the series of carboxylate-based organic electrodes.