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Tailoring the surface properties of LiNi0.4Mn0.4Co0.2O₂ by titanium substitution for improved high voltage cycling performance

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/C5CP03228H· OSTI ID:1214098
 [1];  [2];  [3];  [1];  [4];  [1];  [3]
  1. Univ. of California, Berkeley, CA (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States)
The present research aims to provide insights into the behavior of LiNi0.4Mn0.4Co0.2O2 (NMC442) and LiNi0.4Mn0.4Co0.2O₂ (NMC442-Ti02) cathode materials under galvanostatic cycling to high potentials, in the context of previous work which predicted that Ti-substituted variants should deliver higher capacities and exhibit better cycling stability than the unsubstituted compounds. It is found that NMC cathodes containing Ti show equivalent capacity fading but greater specific capacity than those without Ti in the same potential range. When repeatedly charged to the same degree of delithiation, NMC cathodes containing Ti showed better capacity retention. Soft x-ray absorption spectroscopy (XAS) spectra for Mn and Co indicated increased reduction in these elements for NMC cathodes without Ti, indicating that the substitution of Ti for Co acts to suppress the formation of a high impedance rock salt phase at the surface of NMC cathode particles. The results of this study validate the adoption of a facile change to existing NMC chemistries to improve cathode capacity retention under high voltage cycling conditions.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI ID:
1214098
Report Number(s):
BNL--108310-2015-JA; KC0403020
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 34 Vol. 17; ISSN 1463-9076; ISSN PPCPFQ
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Modification of Ni-Rich FCG NMC and NCA Cathodes by Atomic Layer Deposition: Preventing Surface Phase Transitions for High-Voltage Lithium-Ion Batteries journal May 2016
A review of Ni-based layered oxides for rechargeable Li-ion batteries journal January 2017
Electrospun Nb-doped LiNi 0.4 Co 0.2 Mn 0.4 O 2 nanobelts for lithium-ion batteries journal January 2018
Empowering multicomponent cathode materials for sodium ion batteries by exploring three-dimensional compositional heterogeneities journal January 2018
Chemomechanical behaviors of layered cathode materials in alkali metal ion batteries journal January 2018
Depth-Dependent Redox Behavior of LiNi 0.6 Mn 0.2 Co 0.2 O 2 journal January 2018

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