Journal
ADVANCED MATERIALS
Volume 29, Issue 48, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201700523
Keywords
core-shell structures; lithium-ion batteries; silicon nanoparticles; sol-gel coatings; titanium oxide
Categories
Funding
- National Natural Science Foundation of China [51402049, 51432004]
- Shanghai Committee of Science and Technology, China [14ZR1400600, 17ZR1401000]
- Fundamental Research Funds for the Central Universities [2232015D3-06]
- Programme of Introducing Talents of Discipline to Universities [111-2-04]
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University
- Australian Research Council (ARC) [DP160102627, DP160104089, DP140104062]
- Baosteel-Australia Joint Research and Development Center [BA14006]
- Commonwealth of Australia through the Automotive Australia Cooperative Research Centre (Auto CRC)
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Smart surface coatings of silicon (Si) nanoparticles are shown to be good examples for dramatically improving the cyclability of lithium-ion batteries. Most coating materials, however, face significant challenges, including a low initial Coulombic efficiency, tedious processing, and safety assessment. In this study, a facile sol-gel strategy is demonstrated to synthesize commercial Si nanoparticles encapsulated by amorphous titanium oxide (TiO2), with core-shell structures, which show greatly superior electrochemical performance and high-safety lithium storage. The amorphous TiO2 shell (approximate to 3 nm) shows elastic behavior during lithium discharging and charging processes, maintaining high structural integrity. Interestingly, it is found that the amorphous TiO2 shells offer superior buffering properties compared to crystalline TiO2 layers for unprecedented cycling stability. Moreover, accelerating rate calorimetry testing reveals that the TiO2-encapsulated Si nanoparticles are safer than conventional carbon-coated Si-based anodes.
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