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首页> 外文期刊>Advanced Functional Materials >Rational Molecular Design of Benzoquinone-Derived Cathode Materials for High-Performance Lithium-Ion Batteries
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Rational Molecular Design of Benzoquinone-Derived Cathode Materials for High-Performance Lithium-Ion Batteries

机译：高性能锂离子电池中苯醌衍生阴极材料的合理分子设计

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摘要

p-Benzoquinone (BQ) is a promising cathode material for lithium-ion batteries (LIBs) due to its high theoretical specific capacity and voltage. However, it suffers from a serious dissolution problem in organic electrolytes, leading to poor electrochemical performance. Herein, two BQ-derived molecules with a near-plane structure and relative large skeleton: 1,4-bis(p-benzoquinonyl)benzene (BBQB) and 1,3,5-tris(p-benzoquinonyl)benzene (TBQB) are designed and synthesized. They show greatly decreased solubility as a result of strong intermolecular interactions. As cathode materials for LIBs, they exhibit high carbonyl utilizations of 100% with high initial capacities of 367 and 397 mAh g(-1), respectively. Especially, BBQB with better planarity presents remarkably improved cyclability, retaining a high capacity of 306 mAh g(-1) after 100 cycles. The cycling stability of BBQB surpasses all reported BQ-derived small molecules and most polymers. This work provides a new molecular structure design strategy to suppress the dissolution of organic electrode materials for achieving high performance rechargeable batteries.
机译：对苯醌（BQ）由于其较高的理论比容量和电压而成为锂离子电池（LIB）的有希望的正极材料。但是，它在有机电解质中存在严重的溶解问题，导致不良的电化学性能。在此，两个具有近平面结构且骨架较大的BQ衍生分子：1,4-双（对苯醌基）苯（BBQB）和1,3,5-三（对苯醌基）苯（TBQB）设计和合成。由于强烈的分子间相互作用，它们的溶解度大大降低。作为LIB的阴极材料，它们的羰基利用率高达100％，初始容量分别为367和397 mAh g（-1）。特别是，具有更好平面度的BBQB呈现出显着改善的可循环性，在100次循环后仍保持306 mAh g（-1）的高容量。 BBQB的循环稳定性超过了所有报道的BQ衍生的小分子和大多数聚合物。这项工作提供了一种新的分子结构设计策略，以抑制有机电极材料的溶解，从而获得高性能的可充电电池。

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