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

Nano Convergence

Jang Wook Choi¹  Hye Jin Kim¹  Jin Hyeok Choi¹ 

[1] Graduate School of Energy, Environment, Water, and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST);

关键词: Lithium ion battery;    Magnesio-milling reduction;    Meso-porosity;    Rice husk;    Silicon anode;   

DOI  :  10.1186/s40580-017-0118-x

来源: DOAJ

【 摘 要 】

Abstract Rice husk is produced in a massive amount worldwide as a byproduct of rice cultivation. Rice husk contains approximately 20 wt% of mesoporous SiO2. We produce mesoporous silicon (Si) by reducing the rice husk-originating SiO2 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.

【 授权许可】

Unknown