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This content will become publicly available on August 3, 2019

Title: Evolution of redox couples in Li- and Mn-rich cathode materials and mitigation of voltage fade by reducing oxygen release

Here, voltage fade is a major problem in battery applications for high-energy Lithium- and Manganese-rich (LMR) layered materials. Because of the complexity in the LMR structure, the voltage fade mechanism is not well understood. Here we conduct in situ and ex situ studies on a typical LMR material (Li 1.2Ni 0.15Co 0.1Mn 0.55O 2) during charge-discharge cycling, using multi-length-scale X-ray spectroscopic and 3D electron microscopic imaging techniques. Through probing from surface to bulk, from individual to the whole ensembles of particles, we show that the average valence states of each type of transition metal cations are continuously reduced, which is attributed to the oxygen release from LMR.
Authors:
ORCiD logo [1] ;  [2] ;  [1] ;  [3] ;  [3] ;  [1] ;  [4] ;  [1] ;  [5] ;  [5] ;  [6] ;  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); Chinese Academy of Sciences (CAS), Beijing (China)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Dongguk Univ.-Seoul, Seoul (Republic of Korea)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  6. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Report Number(s):
BNL-207813-2018-JAAM
Journal ID: ISSN 2058--7546
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Nature Energy
Additional Journal Information:
Journal Name: Nature Energy; Journal ID: ISSN 2058--7546
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE
OSTI Identifier:
1460715