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- Title
Mechanochemically Reduced SiO<sub>2</sub> by Ti Incorporation as Lithium Storage Materials.
- Authors
Kim, Kyungbae; Moon, Janghyuk; Lee, Jaewoo; Yu, Ji ‐ Sang; Cho, MaENghyo; Cho, Kyeongjae; Park, Min ‐ Sik; Kim, Jae ‐ Hun; Kim, Young ‐ Jun
- Abstract
This study presents a simple and effective method of reducing amorphous silica (a-SiO2) with Ti metal through high-energy mechanical milling for improving its reactivity when used as an anode material in lithium-ion batteries. Through thermodynamic calculations, it is determined that Ti metal can easily take oxygen atoms from a-SiO2 by forming a thermodynamically stable SiO2− x/TiO x composite, meaning that electrochemically inactive a-SiO2 is partially reduced by the addition of Ti metal powder during milling. This mechanically reduced SiO2− x/TiO x composite anode exhibits a greatly improved electrochemical reactivity, with a reversible capacity of more than 700 mAh g−1 and excellent cycle performance over 100 cycles. Furthermore, an enhancement in the mechanical and thermal stability of the composite during cycling can be mainly attributed to the in situ formation of the SiO2− x/TiO x phase. These findings provide new insight into the rational design of robust, high-capacity, Si-based anode materials, as well as their reaction mechanism.
- Subjects
AMORPHOUS substances; SILICA; THERMODYNAMICS research; COMPOSITE materials research
- Publication
ChemSusChem, 2015, Vol 8, Issue 18, p3111
- ISSN
1864-5631
- Publication type
Article
- DOI
10.1002/cssc.201500638