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This content will become publicly available on July 18, 2018

Title: Synchrotron X-ray nano computed tomography based simulation of stress evolution in LiMn 2O 4 electrodes

Here in this study, synchrotron X-ray nano-computed tomography at Advanced Photon Source in Argonne National Laboratory has been employed to reconstruct real 3D active particle morphology of LiMn 2O 4 (LMO) commonly used in lithium-ion batteries (LIBs). For the first time, carbon-doped binder domain (CBD) has been included in the electrode structure as a 108 nm thick uniform layer using image processing technique. With this unique model, stress generated inside four LMO particles with a uniform layer of CBD has been simulated, demonstrating its strong dependence on local morphology (surface concavity and convexity), and the mechanical properties of CBD such as Young’s modulus. Specifically, high levels of stress have been found in vicinity of particle’s center or near surface concave regions, however much lower than the material failure limits even after discharging at the rate as high as 5C. On the other hand, the stress inside CBD has reached its mechanical limits when discharged at 5C, suggesting that it can potentially lead to failure by plastic deformation. The findings in this study highlight the importance of modeling LIB active particles with CBD and its appropriate compositional design and development to prevent the loss of electrical connectivity of the active particlesmore » from the percolated solid network and power losses due to CBD failure.« less
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [1] ;  [3] ;  [1]
  1. Univ. of Waterloo, ON (Canada). Waterloo Inst. for Nanotechnology, Waterloo Inst. for Sustainable Energy, Dept. of Chemical Engineering
  2. Univ. of Akron, OH (United States). Dept. of Mechanical Engineering
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Electrochimica Acta
Additional Journal Information:
Journal Volume: 247; Journal Issue: C; Journal ID: ISSN 0013-4686
Publisher:
Elsevier
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); University of Akron; National Energy Research Scientific Computing Center (NERSC)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 77 NANOSCIENCE AND NANOTECHNOLOGY; 3D reconstruction; Degradation; Lithium-ion battery; Stress; Synchrotron X-ray nano-computed tomography
OSTI Identifier:
1427540