A novel stability-enhanced lithium-oxygen battery with cellulose-based composite polymer gel as the electrolyte
A novel stability-enhanced lithium-oxygen battery with cellulose-based composite polymer gel as the electrolyte
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DOI：
10.1016/j.electacta.2015.07.111
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发表时间：
2015-09
影响因子：
6.6
通讯作者：
Limin Leng;Xiaoyuan Zeng;Peng Chen;Ting Shu;Huiyu Song;Z. Fu;Haishui Wang;S. Liao
中科院分区：
文献类型：
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作者：
Limin Leng;Xiaoyuan Zeng;Peng Chen;Ting Shu;Huiyu Song;Z. Fu;Haishui Wang;S. Liao
成功制备了一种新型的聚合物凝胶电解质（PGE）膜锂氧（Li-O2）电池。该膜是醋酸纤维素（CA）和聚（偏氟乙烯-共-六氟丙烯）（P（VDF-HFP））的共混物，并使用溶液浇铸技术，然后浸渍锂双（三氟甲烷磺酰亚胺）（LiTFSI）溶液制造。我们表明，PGE膜具有良好的电解质吸收，并显示出高的离子电导率以及优异的热稳定性和电化学稳定性。在相同条件下，与使用商业液体电解质和聚乙烯（PE）隔膜的电池相比，含有我们的PGE作为电解质和隔膜的Li-O2电池表现出良好的倍率性能和增强的循环容量保持率。我们将这种增强的性能归因于PGE，其可能抑制了氧从空气阴极向Li金属阳极的扩散。该研究对解决锂氧电池中氧从阴极向阳极扩散导致的循环稳定性差的问题具有一定的参考价值。
A novel lithium-oxygen (Li-O2) battery with a polymer gel electrolyte (PGE) membrane is successfully prepared. The membrane is a blend of cellulose acetate (CA) and poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) and is fabricated using a solution casting technique followed by impregnation with lithium bis(trifluoromethane sulfonimide) (LiTFSI) solution. We demonstrate that the PGE membrane has good electrolyte uptake and shows high ionic conductivity as well as excellent thermal and electrochemical stability. A Li-O2battery containing our PGE as the electrolyte and separator exhibits good rate capability and enhanced cycling capacity retention compared to a battery using commercial liquid electrolyte and a polyethylene (PE) separator under the same conditions. We attribute this enhanced performance to the PGE, which maybe restrain the diffusion of oxygen from the air cathode to the Li metal anode. This study may prove valuable for resolving the problem of poor cycling stability in Li-O2batteries caused by oxygen diffusion from cathode to anode.