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Redox‐Active Separators for Lithium‐Ion Batteries
Advanced Science ( IF 14.3 ) Pub Date : 2017-12-19 , DOI: 10.1002/advs.201700663
Zhaohui Wang 1 , Ruijun Pan 1 , Changqing Ruan 2 , Kristina Edström 1 , Maria Strømme 2 , Leif Nyholm 1
Affiliation  

A bilayered cellulose‐based separator design is presented that can enhance the electrochemical performance of lithium‐ion batteries (LIBs) via the inclusion of a porous redox‐active layer. The proposed flexible redox‐active separator consists of a mesoporous, insulating nanocellulose fiber layer that provides the necessary insulation between the electrodes and a porous, conductive, and redox‐active polypyrrole‐nanocellulose layer. The latter layer provides mechanical support to the nanocellulose layer and adds extra capacity to the LIBs. The redox‐active separator is mechanically flexible, and no internal short circuits are observed during the operation of the LIBs, even when the redox‐active layer is in direct contact with both electrodes in a symmetric lithium–lithium cell. By replacing a conventional polyethylene separator with a redox‐active separator, the capacity of the proof‐of‐concept LIB battery containing a LiFePO4 cathode and a Li metal anode can be increased from 0.16 to 0.276 mA h due to the capacity contribution from the redox‐active separator. As the presented redox‐active separator concept can be used to increase the capacities of electrochemical energy storage systems, this approach may pave the way for new types of functional separators.

中文翻译:


锂离子电池氧化还原活性分离器



提出了一种基于纤维素的双层隔膜设计,可以通过包含多孔氧化还原活性层来增强锂离子电池(LIB)的电化学性能。所提出的柔性氧化还原活性隔膜由介孔绝缘纳米纤维素纤维层组成,该纤维层在电极和多孔导电氧化还原活性聚吡咯纳米纤维素层之间提供必要的绝缘。后一层为纳米纤维素层提供机械支撑,并为锂离子电池增加额外的容量。氧化还原活性隔膜具有机械柔性,即使氧化还原活性层与对称锂-锂电池中的两个电极直接接触,在锂离子电池运行期间也不会观察到内部短路。通过用氧化还原活性隔膜取代传统的聚乙烯隔膜,包含 LiFePO 4阴极和锂金属阳极的概念验证锂离子电池的容量可以从 0.16 mAh 增加到 0.276 mAh h,这归因于容量的贡献氧化还原活性分离器。由于所提出的氧化还原活性隔膜概念可用于增加电化学储能系统的容量,因此这种方法可能为新型功能隔膜铺平道路。
更新日期:2017-12-19
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