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초록·키워드
This paper presents a new water-based conductive binder composed of carbon nanotubes (CNTs) and graphene nanoplatelets (GnPs) for high-powered Li₄Ti<sub>5</sub>O<sub>12</sub> (LTO) negative electrodes. A solution containing a certain amount of CNTs, GnPs, or both was used to synthesize emulsified poly(acrylonitrile-butyl acrylate) (PANBA) containing conductive CNT, GnP, or CNTxGnP1-x hybrids. These polymers were applied as binders for LTO electrodes and the electrochemical performance was compared with that of a nonconductive PANBA binder. The conductive
CNT<sub>x</sub>GnP<sub>1-x</sub>-PANBA binders had several advantages: superior water-dispersion stability and elongation, lower transport resistance for electrons and lithium ions, and lower charge transfer resistance. This led to stable cycling capacity above 130 mAh g<sup>-1</sup> at the 100<sup>th</sup> cycle for the CNT<sub>x</sub>GnP<sub>1-x</sub>-LTO electrodes without conducting agents and high capacity retention of 5 C/0.2 C above 58.0%. In contrast, the nonconductive PANBA-LTO electrode showed a cycling capacity of 118 mAh g<sup>-1</sup> at the 100<sup>th</sup> cycle and a capacity retention of 5 C/0.2 C of 44.1%.
CNT<sub>x</sub>GnP<sub>1-x</sub>-PANBA binders had several advantages: superior water-dispersion stability and elongation, lower transport resistance for electrons and lithium ions, and lower charge transfer resistance. This led to stable cycling capacity above 130 mAh g<sup>-1</sup> at the 100<sup>th</sup> cycle for the CNT<sub>x</sub>GnP<sub>1-x</sub>-LTO electrodes without conducting agents and high capacity retention of 5 C/0.2 C above 58.0%. In contrast, the nonconductive PANBA-LTO electrode showed a cycling capacity of 118 mAh g<sup>-1</sup> at the 100<sup>th</sup> cycle and a capacity retention of 5 C/0.2 C of 44.1%.
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