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Title: Structural Evolution and Transition Dynamics in Lithium Ion Battery under Fast Charging: An Operando Neutron Diffraction Investigation

Journal Article · · Advanced Science
 [1];  [2];  [2];  [2];  [3];  [2]; ORCiD logo [4]
  1. Electrification and Energy Infrastructures Division Oak Ridge National Laboratory Oak Ridge TN 37830 USA, School of Mechanical Engineering Purdue University West Lafayette IN 47907 USA, Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge TN 37830 USA
  2. Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge TN 37830 USA
  3. School of Mechanical Engineering Purdue University West Lafayette IN 47907 USA
  4. Electrification and Energy Infrastructures Division Oak Ridge National Laboratory Oak Ridge TN 37830 USA

Abstract Fast charging (<15 min) of lithium‐ion batteries (LIBs) for electrical vehicles (EVs) is widely seen as the key factor that will greatly stimulate the EV markets, and its realization is mainly hindered by the sluggish diffusion of Li + . To have a mechanistic understanding of Li + diffusion within LIBs, in this study, structural evolutions of electrodes for a Ni‐rich LiNi 0.6 Mn 0.2 Co 0.2 O 2 (NMC622) || graphite cylindrical cell with high areal loading (2.78 mAh cm −2 ) are developed for operando neutron powder diffraction study at different charging rates. Via sequential Rietveld refinements, changes in structures of NMC622 and Li x C 6 are obtained during moderate and fast charging (from 0.27 C to 4.4 C). NMC622 exhibits the same structural evolution regardless of C‐rates. For phase transitions of Li x C 6 , the stage I (LiC 6 ) phase emerges earlier during the stepwise intercalation at a lower state of charge when charging rate is increased. It is also found that the stage II (LiC 12 ) → stage I (LiC 6 ) transition is the rate‐limiting step during fast charging. The LiC 12 → LiC 6 transition mechanism is further analyzed using the Johnson–Mehl–Avrami–Kolmogorov model. It is concluded as a diffusion‐controlled, 1D phase transition with decreasing nucleation kinetics under increasing chargingrates.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1819232
Journal Information:
Advanced Science, Journal Name: Advanced Science Journal Issue: 21 Vol. 8; ISSN 2198-3844
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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