Yin Jian, Jin Junjie, Chen Cailing, Lei Yongjiu, Tian Zhengnan, Wang Yizhou, Zhao Zhiming, Emwas Abdul-Hamid, Zhu Yunpei, Han Yu, Schwingenschlögl Udo, Zhang Wenli, Alshareef Husam N
Materials Science and Engineering, Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
Advanced Membranes and Porous Materials Center, Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
Angew Chem Int Ed Engl. 2023 Apr 17;62(17):e202301396. doi: 10.1002/anie.202301396. Epub 2023 Mar 20.
Carbonaceous materials are promising anodes for practical potassium-ion batteries, but fail to meet the requirements for durability and high capacities at low potentials. Herein, we constructed a durable carbon anode for high-energy-density K-ion full cells by a preferential pyrolysis strategy. Utilizing S and N volatilization from a π-π stacked supermolecule, the preferential pyrolysis process introduces low-potential active sites of sp hybridized carbon and carbon vacancies, endowing a low-potential "vacancy-adsorption/intercalation" mechanism. The as-prepared carbon anode exhibits a high capacity of 384.2 mAh g (90 % capacity locates below 1 V vs. K/K ), which contributes to a high energy density of 163 Wh kg of K-ion full battery. Moreover, abundant vacancies of carbon alleviate volume variation, boosting the cycling stability over 14 000 cycles (8400 h). Our work provides a new synthesis approach for durable carbon anodes of K-ion full cells with high energy densities.
碳质材料是实用钾离子电池很有前景的阳极材料，但在低电位下无法满足耐久性和高容量的要求。在此，我们通过优先热解策略构建了一种用于高能量密度钾离子全电池的耐用碳阳极。利用来自π-π堆积超分子的硫和氮挥发，优先热解过程引入了sp杂化碳的低电位活性位点和碳空位，赋予了一种低电位的“空位吸附/嵌入”机制。所制备的碳阳极表现出384.2 mAh g的高容量（相对于K/K，90%的容量位于1 V以下），这有助于钾离子全电池实现163 Wh kg的高能量密度。此外，丰富的碳空位减轻了体积变化，使循环稳定性提高到超过14000次循环（8400小时）。我们的工作为具有高能量密度的钾离子全电池耐用碳阳极提供了一种新的合成方法。
