Si-coated nanofiber paper as a lithium ion anode

Silicon coated carbon nanofiber paper is a transformative advance for lithium ion batteries. It shows stable cycling, low irreversible capacity, almost nonexistent persistent irreversible loss, and energy storage >1000 mAh/g (based on its full weight). Its dual use for energy storage material and current collection amplifies this nominal value far higher. The proposed Phase I research involves exploring/enhancing rate capability, and it also includes an initial look into joining technology to connect the paper to a metal tab. A pilot manufacturing system has already been developed and built to continuously make the uncoated paper. Using bulk-available nanofibers and a novel Si deposition method keeps our materials cost under $185/lb, clearly practical. By coating the paper with larger amounts of silicon, it is expected that 1400mAh/g of reversible storage can be reached.