High throughput combinatorial analysis of mechanical and electrochemical properties of Li[NixCoyMnz ]O2 cathode

In this study, Li[NixCoyMnz]O2 cathode composition library was fabricated using combinatorial methodology and characterized using nanoindentation to create a mechanical properties database as a function of Li[NixCoyMnz]O2 composition. A single sputter deposition from LiCoO2, LiNiO2, and LiMn2O4 compound targets resulted in a composition range of 3–44 at.% Co, 20–80 at.% Ni, and 5–50 at.% Mn. Young’s modulus and hardness values were evaluated before and after charge–discharge cycles, and a strong dependency of the mechanical properties on composition was found; Mn-rich composition showed highest retention of its mechanical properties whereas the properties degraded more significantly for the Ni-rich composition. Electrochemical performance was analyzed and compared to mechanical properties at various Li[NixCoyMnz]O2 compositions and a strong correlation between enhanced mechanical properties retention leading to superior discharge capacity retention was found for the Mn-rich compositions. Li[Ni0.33Co0.30Mn0.34]O2 composition showed optimized electrochemical and mechanical properties, where it retained 38% and 50% of its Young’s modulus and hardness after cycling while demonstrating 91% discharge capacity retention after 20 cycles at 1 C-rate.
Publisher
elsevier
Issue Date
2016-12
Language
ENG
Citation

Extreme Mechanics Letters, v.9, pp.439 - 448

ISSN
2352-4316
DOI
10.1016/j.eml.2016.03.019
URI
http://hdl.handle.net/10203/214389
Appears in Collection
EEW-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
  • Hit : 63
  • Download : 0
  • Cited 0 times in thomson ci

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0