A renewable wood-derived cathode for Li-O-2 batteries
A renewable wood-derived cathode for Li-O-2 batteries
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用于锂氧气电池的可再生木材阴极
DOI：
10.1039/c8ta04703k
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发表时间：
2018
影响因子：
11.9
通讯作者：
Liao Shijun
中科院分区：
文献类型：
--
作者：
Zhu Chunliang;Du Li;Luo Junming;Tang Haibo;Cui Zhiming;Song Huiyu;Liao Shijun
在这项工作中，我们开发了一种可再生木材衍生的阴极，具有良好排列的细长微通道，用于高性能Li-O2电池。阴极由天然木材经碳化、活化、然后负载RuO 2纳米颗粒（4.15wt%）作为催化剂（RuO 2/WD-C）而获得。该阴极具有三维、高稳定性的碳基质、均匀锚定的催化剂和良好排列的多孔微通道。结果，电池组的面积比容量超过8 mA h cm-2，并且在0.1mA cm-2下充电端子电位低于3.8V。能量效率提高到91.9%，并且在100次循环后超过87.1%（在0.2 mA cm-2下缩减容量为0.5 mA h cm-2）。此外，RuO 2/WD-C阴极可以通过简单的水洗从深度放电-充电循环或100次削减容量循环中完全再生。再生的RuO 2/WD-C阴极的面积容量与初始阴极的性能相当。经过200次循环后，截止电压高于2.6V。RuO 2/WD-C阴极即使在第二次再生后仍表现出与初始阴极几乎相同的高性能，表明其具有高稳定性和优异的可再生性。
In this work, we developed a renewable wood-derived cathode with well-aligned elongated microchannels for high-performance Li–O2 batteries. The cathode was obtained from natural wood following carbonization, activation, and then loading of RuO2 nanoparticles (4.15 wt%) as catalysts (RuO2/WD-C). The cathode has a three-dimensional, high stability carbon matrix, uniformly anchored catalysts, and well-aligned porous microchannels. As a result, the specific areal capacity of the assembled batteries exceeds 8 mA h cm−2 and the charge terminal potential is lower than 3.8 V at 0.1 mA cm−2. The energy efficiency was improved up to 91.9% and exceeded 87.1% after 100 cycles (curtailed capacity of 0.5 mA h cm−2 at 0.2 mA cm−2). Furthermore, the RuO2/WD-C cathode can be fully regenerated from a deep discharge–charge cycle or 100 curtailed-capacity cycles by simply washing with water. The areal capacity of the regenerated RuO2/WD-C cathode is comparable to the performance of the initial cathode. The cut-off voltage was above 2.6 V following 200 cycles. Even when regenerated for the second time, the RuO2/WD-C cathode still demonstrated almost the same high performance as the initial one, indicating its high stability and excellent renewability.