Large‐Scaled Polyacetylene Batteries

Abstract

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Electrochemically Active Polymers for Rechargeable Batteries

“…Both positive and negative battery electrodes are typically constructed using as-synthesized (virgin, undoped) polyacetylene films. This material is insulating and has to be anion- or cation-doped by electrochemical or chemical oxidation or reduction to become electronically conducting before its utilization as a battery electrode. ,− ,,,− The doping is often performed electrochemically after the battery is assembled. However, especially for the negative electrodes, the use of electrochemically prereduced (precharged) polymer is convenient.…”

“…A wide variety of solvents and electrolytes has been used for the electrochemical anion doping; e.g. propylene carbonate (PC), CH 2 Cl 2 , and THF with LiClO 4 , ,− ,,,− ,− LiBF 4 , , (C 4 H 9 ) 4 NClO 4 , ,,, and LiAsF 6 . , The choice of the solvent seems to have insignificant influence on the anion doping level attained (Table .1).…”

“…For larger cells, Nagatomo et al. when studying p -(CH) x /LiClO 4 /Al cells with a cathode area of 54 cm 2 later found specific energies of 114, 110, and 100 W h kg -1 of (CH) x at discharge currents of 5, 10, and 15 mA, respectively.…”

“… for two types of larger-size Al/LiClO 4 -(PC + EC)/(CH) x cells with electrode areas of 20 and 54 cm 2 where currents of up to 20 mA were used for charging and discharging (which raised the cell voltages after charging to values in excess of 4.5 V). Degradation of (CH) x as well as a decomposition of the organic solvent due to the excess amount of charge and high charging voltage were observed …”

“…In the same paragraph of their paper, the authors stated that no degradation had occurred during >2000 cycles, but the long-term cycling was performed at the very low values of y ) 0.026 for the degree of doping (charging) and ∆y ) 0.002 for the change in the degree of doping (charging) during a given cycle, i.e., with very shallow cycles. 44 For larger cells, Nagatomo et al 54 when studying p-(CH) x /LiClO 4 /Al cells with a cathode area of 54 cm 2 later found specific energies of 114, 110, and 100 W h kg -1 of (CH) x at discharge currents of 5, 10, and 15 mA, respectively.…”