LiCoPO4 mechanical properties evaluated by nanoindentation
| Autor: | T.R. Jow, Heeman Choe, Hyungyung Jo, Travis Thompson, Jeff Wolfenstine, Jeff Sakamoto, Jan L. Allen |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Annealing (metallurgy) Process Chemistry and Technology Modulus Nanoindentation Surfaces Coatings and Films Electronic Optical and Magnetic Materials Fracture toughness Brittleness Residual stress Materials Chemistry Ceramics and Composites Crystallite Composite material Elastic modulus |
| Zdroj: | Ceramics International. 40:13673-13677 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2014.04.122 |
| Popis: | LiCoPO 4 is a promising cathode material for use in high voltage Li-ion batteries. One of the problems with LiCoPO 4 is limited cycle life. One possible cause for the limited cycle life of LiCoPO 4 is mechanical degradation. As a consequence, the mechanical properties, elastic modulus, E , and fracture toughness, K IC , of hot-pressed dense (~98%) polycrystalline (15–20 μm) single phase LiCoPO 4 were investigated. E for the hot-pressed LiCoPO 4 specimen is ~137 GPa while the E value for the LiCoPO 4 specimen after annealing at 600 °C is ~106 GPa. The fracture toughness of the hot-pressed LiCoPO 4 sample is ~0.41 MPa m 1/2 , which increased to ~0.53 MPa m 1/2 after annealing. These low K IC values reveal that LiCoPO 4 is a brittle material. It is believed that the decrease in E and increase in K IC with annealing is associated with a reduction in residual stress. |
| Databáze: | OpenAIRE |
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