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Engineering Rice Husk into a High-Performance Electrode Material through an Ecofriendly Process and Assessing Its Application for Lithium-Ion Sulfur Batteries
- Huang, Sheng-Siang, Tung, Mai Thanh, Huynh, Chinh Dang, Hwang, Bing-Joe, Bieker, Peter Maria, Fang, Chia-Chen, Wu, Nae-Lih
- ACS sustainable chemistry & engineering 2019 v.7 no.8 pp. 7851-7861
- anodes, coatings, lithium batteries, nanoparticles, polymers, pyrolysis, rice hulls, silica, sulfur, surface area, temperature
- High-capacity and cycle-stable SiOₓ/C composite anodes for Li-ion batteries (LIBs) were synthesized from rice husk (RH) using an ecofriendly, one-step pyrolysis process that takes full advantage of both the silica and organic components of RH. The process–property–performance relationship for this process was investigated. Pyrolysis of RH at a sufficiently high temperature (1000 °C) results in a C scaffold with a low surface area, high electronic conductivity, and embedded SiOₓ nanoparticles that are highly active toward lithiation, enabling high rate capability along with outstanding cycle stability for LIB applications. A SiOₓ/C anode delivering a specific capacity of 654 mAh g–¹ and retaining 88% capacity (99.8% CE) after 1000 cycles was demonstrated. Higher capacities, up to 920 mAh g–¹, can be achieved by adding a Si-containing polymer coating on RH prior to pyrolysis. The SiOₓ/C anodes demonstrated considerable promise for Li metal-free Li-ion sulfur batteries.