To view this presentation:

  • If you have an MRS account, click the Login button above.
  • New to MRS?  Create a free account here



  0       0

2015 MRS Spring Meeting


I7.04 - Stress, Deformation, and Fracture of High-Capacity Anodes


Apr 9, 2015 9:45am ‐ Apr 9, 2015 10:00am

Description

We have performed a number of experiments to examine the mechanical behavior of high capacity anodes. In particular, using two separate techniques, we have measured the fracture energy of lithiated silicon thin-film electrodes as a function of lithium concentration. The fracture energy is found to be similar to that of pure silicon and essentially independent of the concentration of lithium. Thus, while lithiated silicon can flow plastically, it appears to fracture in a brittle manner. Additionally, we have measured stresses that develop during lithiation/delithiation of germanium electrodes. We have performed complementary XRD experiments to determine the phases that develop during lithiation/delithiation. These measurements demonstrate plastic flow in germanium, which limits the stresses, thus reducing the driving force for crack propagation. Overall, these experiments provide key insight into the development of high-capacity anode systems that avoid fracture and thereby enable long cycle life.

Speaker(s):

  • Matt Pharr, University of Illinois at Urbana-Champaign

You must be logged in and own this session in order to post comments.

Print Certificate
Review Answers
Print Transcript
Completed on: token-completed_on
Review Answers
Please select the appropriate credit type:
/
test_id: 
credits: 
completed on: 
rendered in: 
* - Indicates answer is required.
token-content
token-speaker-name image
token-speaker-name
token-index
token-content
token-index
token-content
token-index
token-content
token-index
token-content
token-index
token-content
token-index
token-content
/
/
token-index
token-content