<br>碘催化正极的长寿命、优异倍率性能水系锌苯醌电池,Small Methods

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碘催化正极的长寿命、优异倍率性能水系锌苯醌电池
Small Methods ( IF 10.7 ) Pub Date : 2023-10-05 , DOI: 10.1002/smtd.202300809
Chunlai Song ₁ , Qiang Wang ₁ , Ruihang Wen ₁ , Qiben Tang ₁ , Zhiqiang Luo ₁ , Zhihao Yuan ₁

Affiliation

苯醌（BQ）被认为是水性锌基电池理想的正极材料。 BQ电极的主要局限性是严重的升华和较差的导电性，导致电极制备过程中质量损失严重，倍率性能较差。在这项研究中，碘（I ₂ ）物质被用作Zn-BQ电池系统中BQ/BQ ²⁻电对高度可逆转化的有效催化剂，其中N掺杂多孔碳被用作锚定的主体材料BQ分子。在含有1wt% I ₂添加剂的复合电极（表示为BQ-I@NPC）中，I ₂可以作为载体加速Zn ²⁺的传输，并降低电极的电压滞后。因此，BQ-I@NPC正极在0.25 A g ^-1下具有约482 mAh g ^-1的高比容量，实现了545 Wh kg ^-1 （基于BQ）的高能量密度，这是已报道的水性锌基电池有机阴极材料中的最高值。此外，可以获得高BQ负载量（8 mg cm ^-2 ），并实现优异的循环稳定性，在10 C下20,000次后容量保持率约为80%。这项工作提出了一种开发高性能有机电极材料的有效方法。

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A Long-Life and Excellent Rate-Capability Aqueous Zn-Benzoquinone Battery Enabled by Iodine-Catalyzed Cathode

Benzoquinone (BQ) is considered to be a desirable cathode material for aqueous zinc-based batteries. The major limitations of BQ electrode are the severe sublimation and poor electrical conductivity, which results in serious mass loss during electrode preparation and inferior rate performance. In this study, iodine (I₂) species are utilized as an efficient catalyst for the highly reversible conversion of BQ/BQ²⁻ couple in the Zn-BQ battery system, wherein N-doped porous carbon is employed as a host material for anchoring the BQ molecule. In the combination electrode (denoted as BQ-I@NPC) with 1wt% I₂ additive where I₂ can serve as a carrier to accelerates the Zn²⁺ transmission, and reduce the voltage hysteresis of the electrode. As a result, the BQ-I@NPC cathode delivers a high specific capacity of ≈482 mAh g⁻¹ at 0.25 A g⁻¹, realizing a high energy density of 545 Wh kg⁻¹ (based on BQ), which is the highest values among reported organic cathode materials for aqueous Zn-based batteries. Also, a high BQ loading (8 mg cm⁻²) can be attained, and achieving a superior cycling stability with a capacity retention of ≈80% after 20,000 times at 10 C. The work proposes an effective approach toward high performance organic electrode materials.

更新日期：2023-10-05

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