Porous carbon-coated silica macroparticles as anode materials for lithium ion batteries: Effect of boric acid
| Autor: | Youngkuk Kim, Youn-Kyung Baek, Jung-Goo Lee, Seong-Hyun Hong, Jong-Woo Moon |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Carbonization Borosilicate glass Intercalation (chemistry) Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element Electrochemical cell Boric acid chemistry.chemical_compound Amorphous carbon chemistry Lithium Electrical and Electronic Engineering Physical and Theoretical Chemistry Boron |
| Zdroj: | Journal of Power Sources. 272:689-695 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2014.08.128 |
| Popis: | We report carbon-coated porous silica macroparticles (SiO 2 @C) prepared using polymeric templates and subsequent carbonization with sucrose for improved electrochemical energy storage in lithium-ion batteries (LIBs). In addition, boron is introduced to improve the stability of electrochemical cells by pyrolyzing mixtures of sucrose and boric acid (SiO 2 @C + B) under inert atmosphere. The initially large surface area of porous SiO 2 (S BET ∼ 658 m 2 g −1 ) is reduced to 102 m 2 g −1 after carbonization and introduction of boric acid. Surface of both SiO 2 @C and SiO 2 @C + B are covered with amorphous carbon. In particular, SiO 2 @C + B particles containing borosilicate (Si–O–B) phase and B–O bondings and Si–C–O bondings are also detected from the X-ray photoelectron spectra. The SiO 2 @C + B macroparticles shows high reversible charge capacity up to 503 mAh g −1 after 103 cycles of Li intercalation/de-intercalation although initial capacity was 200 mAh g −1 . The improved charge capacity of SiO 2 @C + B is attributed to formation of advantageous microstructures induced from boric acid. |
| Databáze: | OpenAIRE |
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