Conductive polymer binder and separator for high energy density lithium organic battery
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Research Letter
Conductive polymer binder and separator for high energy density lithium organic battery Minami Kato , Hikaru Sano , Tetsu Kiyobayashi , Nobuhiko Takeichi , and Masaru Yao , Department of Energy and Environment, Research Institute of Electrochemical Energy, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan Address all correspondence to Minami Kato at [email protected] and Masaru Yao at [email protected] (Received 14 June 2019; accepted 30 July 2019)
Abstract The practical realization of rechargeable organic batteries is stalled by their low electron conductivity, which limits the organic-active material content in the electrode composite and results in a low net electrode energy density. Additionally, the dissolution of active materials into the electrolyte causes a short cycle life. In this study, a conductive polymer mixture, poly(3,4-ethylenedioxythiophene)/polystyrenesulfonate, containing a small amount of sugar alcohol was used as the binder and separator in a rechargeable organic battery. Consequently, the active material content was increased up to 80 wt%, and the cycle life was extended.
Introduction Rechargeable organic batteries have attracted much attention owing to their potentially high-energy density and environmental friendliness. In particular, organic electrode compounds that undergo multi-electron transfer redox reactions are promising as active materials of next-generation rechargeable batteries with high energy density. In the 1980s, a rechargeable organic battery using polyaniline as the cathode and metallic lithium as the anode was proposed, but the proposal was far from practical application.[1] Around the 2000s, radical polymer batteries with high power performance attracted much attention,[2] but they did not come into widespread use, probably because of their low capacity. In recent years, a series of low-molecular-weight compounds that undergo multi-electron transfer redox reactions have been intensively studied because they potentially have the potential for high capacity. In particular, many papers described the battery performance of quinone derivatives.[3–10] However, two major problems must be solved to enable the practical application of organic batteries: one is the short cycle life and the other is that their low electronic conductivity necessitates a large amount of conductive additives, resulting in a low net energy density of the electrode. The short cycle life is due to the dissolution of the active material into the electrolyte solution, which can be suppressed by introducing polar groups,[8] oligomerization, and polymerization.[11] On the other hand, the low active material content of the electrode composite has been hardly addressed.[12] This problem is often overlooked when evaluating the capacity of the active material per unit mass of the material, and the experimental content in the electrode is often 102 S/cm). In a different context, the conductivity of PEDOT/PSS was reported
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