Improving the Performance and Stability of Silicon Microparticle Anodes in Lithium-Ion Batteries using Polymeric Cobalt Phthalocyanine-based Organic Nanofibers
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Demand for higher energy and longer cycle life LIBs is increasing due to energy storage and conversion industry growth. Silicon has high theoretical specific capacity (~4200 mAh g-1), but its volume expansion (~400 %) and intrinsic low conductivity hamper its cycling stability. This study introduces a strategy to utilize polymeric cobalt phthalocyanine with triethylene glycol linker (TEGCoPPc) as an effective channeling additive for Si anode, which can simultaneously alleviate the capacity fading by the volume expansion of Si microparticles. TEGCoPPc exhibits excellent coating ability on carbon nanotubes (TEGCoPPc/CNT), enhancing the performance. The silicon anode with TEGCoPPc/CNT additives demonstrates high rate capability and stable cycling performance (1539 mA h g-1 at 8.4 A g-1, and 1040 mAh g-1 after 200 cycles at 2.1 A g-1). Phthalocyanine-based organic materials offer potential to address Si anode drawbacks and design high stability Si microparticle-based LIB anodes.