School of Mechanical Engineering, Pusan National University, Busan 609-735, Republic of Korea.
Center for Energy Convergence, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea.
Sci Rep. 2017 Feb 6;7:42238. doi: 10.1038/srep42238.
The porous carbon matrix is widely recognized to be a promising sulfur reservoir to improve the cycle life by suppressing the polysulfide dissolution in lithium sulfur batteries (LSB). Herein, we synthesized mesocellular carbon foam (MSUF-C) with bimodal mesopore (4 and 30 nm) and large pore volume (1.72 cm/g) using MSUF silica as a template and employed it as both the sulfur reservoir and the conductive agent in the sulfur cathode. Sulfur was uniformly infiltrated into MSUF-C pores by a chemical solution deposition method (MSUF-C/S CSD) and the amount of sulfur loading was achieved as high as 73% thanks to the large pore volume with the CSD approach. MSUF-C/S CSD showed a high capacity (889 mAh/g after 100 cycles at 0.2 C), an improved rate capability (879 mAh/g at 1C and 420 mAh/g at 2C), and a good capacity retention with a fade rate of 0.16% per cycle over 100 cycles.
多孔碳基质被广泛认为是一种很有前途的硫库，可通过抑制锂硫电池（LSB）中多硫化物的溶解来提高循环寿命。在此，我们使用 MSUF 硅作为模板合成了具有中孔（4 和 30nm）和大孔体积（1.72cm/g）的介孔碳泡沫（MSUF-C），并将其用作硫正极中的硫储层和导电剂。通过化学溶液沉积法（MSUF-C/S CSD）将硫均匀地渗透到 MSUF-C 的孔中，由于 CSD 方法的大孔体积，硫的负载量高达 73%。MSUF-C/S CSD 表现出高容量（在 0.2C 下循环 100 次后为 889mAh/g）、改进的倍率性能（在 1C 时为 879mAh/g，在 2C 时为 420mAh/g）以及良好的容量保持率，在 100 次循环中，衰减率为 0.16%/循环。
