Flexible lithium–CO2 battery with ultrahigh capacity and stable cycling†,Energy & Environmental Science

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Flexible lithium–CO2 battery with ultrahigh capacity and stable cycling†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-09-26 00:00:00 , DOI: 10.1039/c8ee01468j
Shaomao Xu _{1,

2,

3,

4} , Chaoji Chen _{1,

2,

3,

4} , Yudi Kuang _{1,

2,

3,

4} , Jianwei Song _{1,

2,

3,

4} , Wentao Gan _{1,

2,

3,

4} , Boyang Liu _{1,

2,

3,

4} , Emily M. Hitz _{1,

2,

3,

4} , John W. Connell _{4,

5,

6} , Yi Lin _{4,

6,

7} , Liangbing Hu _{1,

2,

3,

4}

Affiliation

Carbon dioxide is understood as a major contributor to the greenhouse effect. The search for an effective and efficient method for CO₂ capture and utilization has become a priority task on a global scale. For Mars exploration missions, the ability to use the CO₂ in the atmosphere (96%) could offer great benefits in terms of energy storage. The Li–CO₂ battery is considered a promising platform for CO₂ capture, with its ability to utilize the captured CO₂ for energy storage. However, the Li–CO₂ battery still suffers various inadequacies, including the slow kinetics of CO₂ reduction, the high charge/discharge hysteresis, the ultra-stable discharge product, and the slow transport of CO₂ gas and electrolyte. In this work, we introduce a high-capacity, long-life Li–CO₂ battery based on a flexible wood cathode architecture. Mother nature has produced the most efficient ion and gas transport architectural system in the form of wood. The unique channel structure of the wood-based cathode separates the transport of CO₂ and the electrolyte into specific pathways, leading to facilitated transport. The improvements in mass transport, combined with faster kinetics as a result of the use of Ru nanocatalyst supported on carbon nanotubes that reside in the microchannels, contribute to substantially improved electrochemical performance. Stable cycling for over 200 cycles with both a low overpotential and an ultrahigh discharge capacity of 11 mA h cm⁻² is achieved with the flexible wood-based Li–CO₂ battery. Such a long cycle life and high capacity is unprecedented for a Li–CO₂ battery. Additionally, the cathode exhibits excellent mechanical flexibility imparted by the flexible wood scaffold, holding great promise for wearable device applications. The high capacity and the long cycle life make the flexible wood cathode Li–CO₂ battery a promising candidate for combining CO₂ capture and utilization.

中文翻译：

柔性锂– CO ₂电池，具有超高容量和稳定的循环运行†

二氧化碳被认为是造成温室效应的主要因素。寻找有效和高效的CO ₂捕集和利用方法已成为全球范围内的优先任务。对于火星探测任务，在大气中使用CO ₂的能力（96％）可以在储能方面带来巨大的好处。Li–CO ₂电池被认为是捕获CO ₂的有前途的平台，它具有利用捕获的CO ₂进行能量存储的能力。但是，Li–CO ₂电池仍然存在各种不足之处，包括CO ₂动力学缓慢。减少，高的充电/放电滞后，超稳定的放电产物以及CO ₂气体和电解质的缓慢输送。在这项工作中，我们介绍了基于灵活的木质阴极架构的高容量，长寿命的Li–CO ₂电池。大自然母亲以木材的形式生产了最有效的离子和气体传输建筑体系。木质阴极的独特通道结构分离了CO ₂的传输和电解质进入特定的途径，从而促进运输。由于使用了负载在微通道中的碳纳米管上负载的Ru纳米催化剂，质量传输的改进与更快的动力学相结合，有助于显着提高电化学性能。灵活的木质Li-CO ₂电池可实现200多个周期的稳定循环，既有低电势又有11 mA h cm ^-2的超高放电容量。对于Li–CO _2而言，如此长的循环寿命和高容量是前所未有的电池。另外，阴极显示出由挠性木质支架赋予的优异的机械挠性，为可穿戴设备的应用提供了广阔的前景。高容量和长循环寿命使柔性木质阴极Li–CO ₂电池成为结合CO ₂捕集和利用的有前途的候选者。

更新日期：2018-09-26

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