Patterned macroporous Fe3C/C membrane-induced high ionic conductivity for integrated Lisulfur battery cathodes
发表时间：2019-11-06
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- 论文类型：
- 期刊论文
- 第一作者：
- Kou, Wei
- 通讯作者：
- Li, XC (reprint author), Dalian Univ Technol, Chem Engn Dept, State Key Lab Fine Chem, Linggong Rd 2, Dalian 116024, Peoples R China.
- 合写作者：
- Chen, Guohui,Liu, Yang,Guan, Weixin,Li, Xiangcun,Zhang, Ning,He, Gaohong
- 发表时间：
- 2019-09-28
- 发表刊物：
- JOURNAL OF MATERIALS CHEMISTRY A
- 收录刊物：
- EI、SCIE
- 文献类型：
- J
- 卷号：
- 7
- 期号：
- 36
- 页面范围：
- 20614-20623
- ISSN号：
- 2050-7488
- 摘要：
- To realize an Al-free cathode and to push forward the Li-S battery technology for practical applications, a multifunctional three-layer-structured Fe3C/C membrane was prepared at a large-scale via a facile phase-inversion method. The scalable yet flexible self-supporting Fe3C/C membrane is an ideal Al foilfree cathode material for high-energy and long cycling Li-S batteries. The conductive dense layer of the Fe3C/C membrane can replace the Al foil as a current collector and the finger-like macropores can host most of the sulfur active material (1.5-3.0 mg cm 2), thus buffering the volume expansion of the sulfur species and facilitating the ion/electrolyte transport for fast reaction kinetics; meanwhile, the sponge-like pores in the top layer of the composite membrane enable further S slurry loading. Density functional theory simulation (DFT) and Li2S6 adsorption measurements reveal that the doped Fe3C species in the composite membrane could effectively immobilize the S species and suppress the shuttle effect of the soluble polysulfides (LiPSs). The rationally designed Fe3C/C membrane cathodes could deliver a capacity of 601 mA h g 1 at 1C after 200 cycles even at a high sulfur loading of 3.4 mg cm 2, with a high areal capacity of 2.1 mA h cm 2. The cell with the sulfur loading of 3.4 mg cm 2 delivered a gravimetric energy density and volumetric energy density of 850 W h kg 1 and 1223 W h L 1, respectively. The selfsupporting membrane cathode with simultaneous commercial S filling and S/C slurry coating provides an alternative sulfur loading approach for battery assembly, thus presenting a useful strategy for practical applications in high energy-density and long cycling Li-S batteries.
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