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Title: Strategies to Avert Electrochemical Shock and Their Demonstration in Spinels

Journal Article · · Journal of the Electrochemical Society
DOI:https://doi.org/10.1149/2.0021411jes· OSTI ID:1557427
 [1];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

We demonstrate that extensive electrochemical shock–electrochemical cycling induced fracture–occurs due to coherency stresses arising from first order cubic-to-cubic phase transformations in the spinels LiMn2O4 and LiMn1.5Ni0.5O4. Electrochemical shock occurs despite the isotropy of the shape changes in these materials. This electrochemical shock mechanism is strongly sensitive to particle size; for LiMn2O4 and LiMn1.5Ni0.5O4, fracture can be averted with particle sizes smaller than ~1 μm. As a further critical test of the proposed mechanism, iron-doping was used to induce continuous solid solubility of lithium in LiMn1.5Ni0.5O4, and shown to virtually avert electrochemical shock, while having minimal impact on the electrode potential and capacity.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0002633
OSTI ID:
1557427
Journal Information:
Journal of the Electrochemical Society, Vol. 161, Issue 11; ISSN 0013-4651
Publisher:
The Electrochemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Cited By (3)

Analytical modeling and simulation of porous electrodes: Li-ion distribution and diffusion-induced stress journal August 2017
Li 2 Ni 0.2 Co 1.8 O 4 having a spinel framework as a zero-strain positive electrode material for lithium-ion batteries journal January 2019
Electrochemomechanical Fatigue: Decoupling Mechanisms of Fracture-Induced Performance Degradation in Li X Mn 2 O 4 journal January 2018