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Composites of silicon@Li₄Ti₅O₁₂ and graphite for high-capacity lithium-ion battery anode materials

From National Research Council Canada

Alternative titleComposites of silicon@Li4Ti5O12 and graphite for high-capacity lithium-ion battery anode materials
DOIResolve DOI: https://doi.org/10.1149/1945-7111/abda05
AuthorSearch for: 1ORCID identifier: https://orcid.org/0000-0001-7037-9210; Search for: ; Search for: 1ORCID identifier: https://orcid.org/0000-0001-7321-1288; Search for: 1; Search for: 2; Search for: ; Search for: 1
Affiliation
  1. National Research Council of Canada. Energy, Mining and Environment
  2. National Research Council of Canada. Automotive and Surface Transportation
FormatText, Article
Abstract
Silicon (Si) is a promising anode material for lithium-ion batteries owing to its high theoretical capacity. However, it suffers from poor capacity retention during cycling due to mechanical stresses, pulverization, and an unstable solid electrolyte interface. One practical approach to mitigate the problem is a coating design, where nano-sized silicon is encapsulated within a selected protective layer. In this study, silicon nanoparticles have been coated with a protective layer of Li₄Ti₅O₁₂ (LTO) ceramic and prepared using a water-based sodium alginate binder. It is found that the Si@LTO composites can be combined with graphite to improve battery performance further. The composite electrodes have been tested in half cells at C/10 and 1C rates. The best Si@LTO and graphite composite has an initial high capacity (∼900 mAh g⁻¹ at C/10 and ∼600 mAh g⁻¹ at 1C) and good capacity retention. It is found that this capacity retention is superior to Si@LTO alone and a binary composite of silicon with graphite. These Si@LTO + graphite composites are a promising way to integrate silicon into the development of stable and high-energy-density lithium-ion batteries.
Publication date
PublisherECS
IOP
In
  • Journal of The Electrochemical Society 168, no. 1, 010524 (15 January 2021): 1–8.
LanguageEnglish
Peer reviewedYes
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Record identifier13281b2c-8871-4132-97d8-8b44c6f6be6d
Record created2021-12-16
Record modified2021-12-16
Date modified: