All-solid-state sodium-sulfur battery showing full capacity with activated carbon MSP20-sulfur-Na3SbS4 composite
All-solid-state sodium-sulfur battery showing full capacity with activated carbon MSP20-sulfur-Na3SbS4 composite
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DOI：
10.1016/j.elecom.2020.106741
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发表时间：
2020-07-01
影响因子：
5.4
通讯作者：
Akitoshi, Hayashi
中科院分区：
文献类型：
--
作者：
Ando, Taka;Atsushi, Sakuda;Akitoshi, Hayashi
由于全固态Na-S电池的充放电反应缓慢，因此需要有效设计全固态Na-S电池中的复合电极。通过采用活性炭MSP 20、硫和Na 3SbS 4的复合物作为正极材料，我们开发了一种有效的全固态Na-S电池，该电池表现出高容量和良好的循环性能的优点。此外，我们发现用硫填充碳微孔并与高导电性的Na 3SbS 4结合，导致S和Na 2S之间的可逆双电子反应。这种全固态Na-S电池在室温下工作，具有每克硫1560 mAh的高容量（约1000 mAh）。330 mAh/g正极），并且在50次循环后容量保持率为93%。观察到在液相过程中减小用Na 3SbS 4涂覆的S-MSP 20颗粒的尺寸以减少在充电和放电循环期间颗粒的体积变化，这导致优异的电化学性能。
The need for an effective design of composite electrodes in all-solid-state Na-S batteries is warranted because of their slow charge-discharge reactions. By employing a composite of activated carbon MSP20, sulfur, and Na3SbS4 as the positive electrode material, we developed an effective all-solid-state Na-S battery that demonstrated the advantages of exhibiting a high capacity and good cyclability. Further, we discovered that filling the carbon micropores with sulfur and combining with highly conductive Na3SbS4, results in a reversible two-electron reaction between S and Na2S. This all-solid-state Na-S battery, operating at room temperature, demonstrates a high capacity of 1560 mAh per gram of sulfur (ca. 330 mAh per gram of positive electrode) and a capacity retention of 93% after 50 cycles. Decreasing the size of the S-MSP20 particles coated with Na3SbS4 in a liquid phase process was observed to reduce the volume change of the particles during charge and discharge cycles, which resulted in an excellent electrochemical performance.