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Title: Disintegration of Meatball Electrodes for LiNi x Mn y Co z O2 Cathode Materials

Journal Article · · Experimental Mechanics
 [1];  [1];  [1];  [2];  [1]
  1. Purdue Univ., West Lafayette, IN (United States). School of Mechanical Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Science Division
+ Show Author Affiliations

Mechanical degradation of Li-ion batteries caused by the repetitive swelling and shrinking of electrodes upon electrochemical cycles is now well recognized. Structural disintegration of the state-of-art cathode materials of a hierarchical structure is relatively less studied. We track the microstructural evolution of different marked regimes in LiNi x Mn y Co z O2 (NMC) electrodes after lithiation cycles. Decohesion of primary particles constitutes the major mechanical degradation in the NMC materials, which results in the loss of connectivity of the conductive network and impedance increase. We find that the structural disintegration is largely dependent on the charging rate – slow charging causes more damage, and is relatively insensitive to the cyclic voltage window. We use finite element modeling to study the evolution of Li concentration and stresses in a NMC secondary particle and employ the cohesive zone model to simulate the interfacial fracture between primary particles. We reveal that microcracks accumulate and propagate during the cyclic lithiation and delithiation at a slow charging rate.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Purdue Univ., West Lafayette, IN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V); National Science Foundation (NSF); Office of Naval Research (ONR) (United States); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC05-00OR22725; CBET-1603866
OSTI ID:
1424455
Alternate ID(s):
OSTI ID: 1474506
Journal Information:
Experimental Mechanics, Vol. 58, Issue 4; ISSN 0014-4851
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 65 works
Citation information provided by
Web of Science

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Cited By (9)

High‐Voltage Charging‐Induced Strain, Heterogeneity, and Micro‐Cracks in Secondary Particles of a Nickel‐Rich Layered Cathode Material journal March 2019
Dopant Segregation Boosting High‐Voltage Cyclability of Layered Cathode for Sodium Ion Batteries journal September 2019
Quantification of Heterogeneous Degradation in Li‐Ion Batteries journal May 2019
Effects of Charge Cutoff Potential on an Electrolyte Additive for LiNi 0.6 Co 0.2 Mn 0.2 O 2 –Mesocarbon Microbead Full Cells journal March 2019
Mechanistic understanding of intergranular cracking in NCM cathode material: mesoscale simulation with three-dimensional microstructure journal January 2018
Nickel enrichment of next-generation NMC nanomaterials alters material stability, causing unexpected dissolution behavior and observed toxicity to S. oneidensis MR-1 and D. magna journal January 2020
The Influence of Surface Stress on the Chemo-Mechanical Behavior of Inverse-Opal-Structured Electrodes for Lithium-Ion Batteries journal January 2020
Communication—Fracture Behavior of Single LiNi 0.33 Mn 0.33 Co 0.33 O 2 Particles Studied by Flat Punch Indentation journal January 2019
Challenges of Fast Charging for Electric Vehicles and the Role of Red Phosphorous as Anode Material: Review journal October 2019

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Related Subjects

25 ENERGY STORAGE
42 ENGINEERING
fracture
NMC
stresses
primary particles
Li-ion batteries