Establishing substitution rules of functional groups for high-capacity organic anode materials in Na-ion batteries
Establishing substitution rules of functional groups for high-capacity organic anode materials in Na-ion batteries
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DOI：
10.1016/j.jpowsour.2022.231383
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发表时间：
2022-06
影响因子：
9.2
通讯作者：
Kathryn Holguin;Kaiqiang Qin;E. Kamphaus;Fuxiang Chen;Lei Cheng;Gui‐Liang Xu;K. Amine;Chao Luo
中科院分区：
文献类型：
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作者：
Kathryn Holguin;Kaiqiang Qin;E. Kamphaus;Fuxiang Chen;Lei Cheng;Gui‐Liang Xu;K. Amine;Chao Luo
调整有机电极材料的分子结构可以提高其在钠离子电池中的性能，但取代规律及其对比容量和工作电位的影响仍然是个未知数。在这里，通过考察三种具有选择性N取代或扩展共轭结构的羧酸钠，我们利用结构与性能之间的相关性来建立高容量OEM的替代规则。我们的结果表明，取代位置和官能团的类型对于创造吸收/去除Na+的活性中心和热力学稳定的有机结构是必不可少的。此外，还进行了合理的主体设计和电解液调节，将循环寿命延长到500次。以最优的2，2‘-联吡啶-4，4’-二羧酸二钠盐阳极和聚苯胺阴极为基础的全电池验证了实现全有机电池的可行性。这项工作为高容量、稳定的可持续储能OEM的设计原则提供了有价值的指导。
Tailoring molecular structures of organic electrode materials (OEMs) can enhance their performance in Na-ion batteries, however, the substitution rules and the consequent effect on the specific capacity and working potential remain elusive. Herein, by examining three sodium carboxylates with selective N substitution or extended conjugation structure, we exploited the correlation between structure and performance to establish substitution rules for high-capacity OEMs. Our results show that substitution position and types of functional groups are essential to create active centers for uptake/removal of Na+and thermodynamically stabilize organic structures. Furthermore, rational host design and electrolytes modulation were performed to extend the cycle life to 500 cycles. A full cell based on the optimal 2,2′-bipyridine-4,4′-dicarboxylic acid disodium salt anode and the polyaniline cathode is demonstrated to confirm the feasibility of achieving all-organic batteries. This work provides a valuable guideline for the design principle of high-capacity and stable OEMs for sustainable energy storage.