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Ti3C2Tx MXene Interface Layer Driving Ultra-Stable Lithium-Iodine Batteries with Both High Iodine Content and Mass Loading.
ACS Nano ( IF 15.8 ) Pub Date : 2020-01-06 , DOI: 10.1021/acsnano.9b09541
Chuang Sun 1, 2 , Xinlei Shi 3 , Yabo Zhang 1 , Jiajie Liang 3 , Jie Qu 2 , Chao Lai 1
Affiliation  

Lithium-iodine (Li-I2) batteries are promising candidates for next-generation electrochemical energy storage systems due to their high energy density and the excellent kinetic rates of I2 cathodes. However, dissolution of iodine and iodide has hindered their widespread adoption for practical applications. Herein, a Ti3C2Tx MXene foam with a three-dimensional hierarchical porous architecture is proposed as a cathode-electrolyte interface layer in Li-I2 batteries, enabling high-rate and ultrastable cycling performance at a high iodine content and loading mass. Theoretical calculations and empirical characterizations indicate that Ti3C2Tx MXene sheets with high metallic conductivity not only provide strong chemical binding with iodine species to suppress the shuttle effect but also facilitate fast redox reactions during cell cycling. As a result, the Li-I2 battery using a cathode with 70 wt % I2 cycled stably for over 1000 cycles at a rate of 2 C, even at an ultrahigh loading mass of 5.2 mg cm-2. To the best of the authors' knowledge, this is the highest reported loading at such a high iodine content. This work suggests that using a Ti3C2Tx MXene interface layer can enable the design and application of high-energy Li-I2 batteries.

中文翻译:

Ti3C2Tx MXene界面层可驱动具有高碘含量和大量负载的超稳定锂碘电池。

锂碘(Li-I2)电池因其高能量密度和出色的I2阴极动力学速率而成为下一代电化学能量存储系统的有希望的候选者。但是,碘和碘化物的溶解阻碍了它们在实际应用中的广泛采用。在本文中,提出了具有三维分层多孔结构的Ti3C2Tx MXene泡沫作为Li-I2电池中的阴极-电解质界面层,在高碘含量和高负载质量下实现了高速率和超稳定的循环性能。理论计算和经验表征表明,具有高金属电导率的Ti3C2Tx MXene片材不仅提供与碘的强化学键合以抑制穿梭效应,而且还促进了细胞循环过程中的快速氧化还原反应。结果是,使用具有70 wt%I2的阴极的Li-I2电池,即使在5.2 mg cm-2的超高负载质量下,也以2 C的速率稳定循环了1000多个循环。据作者所知,在如此高的碘含量下,这是报道的最高负载量。这项工作表明,使用Ti3C2Tx MXene界面层可以实现高能Li-I2电池的设计和应用。
更新日期:2020-01-09
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