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Low-Temperature Synthesis, Structural Characterization, and Electrochemistry of Ni-Rich Spinel-like LiNi2–yMnyO4 (0.4 ≤ y ≤ 1)

Journal Article · · Chemistry of Materials
 [1];  [2];  [1]
  1. Univ. of Texas, Austin, TX (United States). Materials Science and Engineering Program. Texas Materials Inst.
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Science Division

The thermal conversion of chemically delithiated layered Li0.5Ni1–yMnyO2 (0.2 ≤ y ≤ 0.5) into spinel-like LiNi2–yMnyO4 (0.4 ≤ y ≤ 1) has been systematically investigated in this paper. The formed spinel-like phases are metastable and cannot be accessed by a conventional high-temperature solid-state method. The layered-to-spinel transformation mechanism has been studied by the Rietveld refinement of in situ neutron diffraction as a function of temperature (25–300 °C). In particular, the ionic diffusion of Li and M ions is quantified at different temperatures. Electrochemistry of the metastable spinel-like phases obtained has been studied in lithium-ion cells. A bond valence sum map has been performed to understand the ionic diffusion of lithium ions in the Ni-rich layered, spinel, and rock-salt structures. Finally, the study can aid the understanding of the possible phases that could be formed during the cycling of Ni-rich layered oxide cathodes.

Research Organization:
Univ. of Texas, Austin, TX (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF) (United States); Welch Foundation (United States)
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357
OSTI ID:
1261485
Alternate ID(s):
OSTI ID: 1235475
Journal Information:
Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 22 Vol. 27; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

A reflection on lithium-ion battery cathode chemistry journal March 2020
Evolution of Local Structural Ordering and Chemical Distribution upon Delithiation of a Rock Salt–Structured Li 1.3 Ta 0.3 Mn 0.4 O 2 Cathode journal February 2019
Critical Role of pH Evolution of Electrolyte in the Reaction Mechanism for Rechargeable Zinc Batteries journal September 2016
Microwave-assisted chemical insertion: a rapid technique for screening cathodes for Mg-ion batteries journal January 2017

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