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Bi-functional nafion/γ-Al2O3 membrane for stable Li-sulfur battery cathode

24 October 2014

Researchers at Tianjin University (China) report another approach to stabilizing the performance of a Li-sulfur battery. In a paper in the Journal of Power Sources, they describe the preparation of a sulfur cathode modified by a bi-functional nafion/γ-Al₂O₃ (aluminum oxide) membrane which can “remarkably” immobilize the polysulfides—a major cause of rapid capacity degradation—within the unique cathode structure due to its ion selectivity and absorbent capacity.

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They report a high initial discharge capacity of 1448.0 mAh g⁻¹ can be achieved at 1C and a capacity of 788.6 mAh g⁻¹ after 200 cycles, indicating a slow degradation. The coulombic efficiency remains as high as 97% during cycling.

The researchers attributed the excellent electrochemical properties to the bifunctional and stable membrane which reduces the polysulfide shuttle effect and maintains its integrity even after charging–discharging for 200 cycles.

Resources

• Xiaoyan Liu, Zhongqiang Shan, Kunlei Zhu, Jiangyong Du, Qiwei Tang, Jianhua Tian (2015) “Sulfur electrode modified by bifunctional nafion/γ-Al₂O₃ membrane for high performance lithium–sulfur batteries,” Journal of Power Sources, Volume 274, Pages 85-93, doi: 10.1016/j.jpowsour.2014.10.039

October 24, 2014 in Brief | Permalink

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