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Rice husk-originating silicon–graphite composites for advanced lithium ion battery anodes

Rice husk is produced in a massive amount worldwide as a byproduct of rice cultivation. Rice husk contains approximately 20 wt% of mesoporous SiO(2). We produce mesoporous silicon (Si) by reducing the rice husk-originating SiO(2) using a magnesio-milling process. Taking advantage of meso-porosity an...

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Detalles Bibliográficos
Autores principales: Kim, Hye Jin, Choi, Jin Hyeok, Choi, Jang Wook
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Singapore 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5603619/
https://www.ncbi.nlm.nih.gov/pubmed/28983451
http://dx.doi.org/10.1186/s40580-017-0118-x
Descripción
Sumario:Rice husk is produced in a massive amount worldwide as a byproduct of rice cultivation. Rice husk contains approximately 20 wt% of mesoporous SiO(2). We produce mesoporous silicon (Si) by reducing the rice husk-originating SiO(2) using a magnesio-milling process. Taking advantage of meso-porosity and large available quantity, we apply rice husk-originating Si to lithium ion battery anodes in a composite form with commercial graphite. By varying the mass ratio between these two components, trade-off relation between specific capacity and cycle life was observed. A controllable pre-lithiation scheme was adopted to increase the initial Coulombic efficiency and energy density. The series of electrochemical results suggest that rice husk-originating Si–graphite composites are promising candidates for high capacity lithium ion battery anodes, with the prominent advantages in battery performance and scalability.