A conjugated microporous polymer (CMP) combining triazine and bithiophene units in the same framework is synthesized by a facile solvent-free one-pot method and employed as an anode material for lithium/sodium-ion batteries (LIBs/SIBs). It exhibits a large rate capability with a high reversible capacity for LIBs after activation, ., 1014 mAh g at 0.1 A g and 486 mAh g at a current density of 5 A g with outstanding cycling stability. Meanwhile, it delivers perfect electrochemical properties for SIBs, featuring high reversible specific capacities of 425/260/156 mAh g at 0.1/1/5 A g. Especially, the CMP even outstrips most crystalline covalent organic frameworks (COFs) as SIB anodes at high current density. The lithium and sodium storage mechanisms of the CMP structural unit involve 11-electron redox reactions with four and three-step structure evolutions respectively, as follows from density functional theory calculations. The reported study demonstrates the CMP with redox-active electron donating units via triazine bonding as a promising electrode material for next-generation green sustainable energy storage devices.

中文翻译：

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无溶剂合成聚三嗪-联噻吩，具有优异的锂/钠离子存储性能

通过简便的无溶剂一锅法合成了在同一骨架中结合三嗪和联噻吩单元的共轭微孔聚合物（CMP），并将其用作锂/钠离子电池（LIB/SIB）的负极材料。它表现出大倍率性能，激活后锂离子电池具有高可逆容量，0.1 A g-1 时为 1014 mAh g-1，电流密度为 5 A g-1 时为 486 mAh g-1，具有出色的循环稳定性。同时，它为SIB提供了完美的电化学性能，在0.1/1/5 A g-1时具有425/260/156 mAh g-1的高可逆比容量。特别是，在高电流密度下，CMP 甚至超过了大多数作为 SIB 阳极的结晶共价有机框架 (COF)。 CMP结构单元的锂和钠存储机制涉及11电子氧化还原反应，分别具有四步和三步结构演化，根据密度泛函理论计算如下。报道的研究表明，通过三嗪键合具有氧化还原活性电子给体单元的 CMP 作为下一代绿色可持续能源存储设备的有前途的电极材料。