Title: Revisiting the capacity-fading mechanism of P2-type sodium layered oxide cathode materials during high-voltage cycling

Journal Article · · Journal of Energy Chemistry
 [1];  [2];  [1];  [1];  [3];  [1];  [1];  [1];  [4];  [1];  [1];  [3];  [1];  [1];  [4];  [5];  [6]
  1. Shanghai Jiao Tong Univ., Shanghai (China)
  2. Shanghai Jiao Tong Univ. (China); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  3. Chinese Academy of Sciences (CAS), Jiangsu (China)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  5. Shanghai Jiao Tong Univ., Shanghai (China); Shanghai Jiao Tong Univ., Chengdu (China)
  6. Shanghai Jiao Tong Univ. (China)

We report P2-type sodium layered oxide cathode (Na2/3Ni1/3Mn2/3O2, P2-NNMO) has attracted great attention as a promising cathode material for sodium ion batteries because of its high specific capacity. However, this material suffers from a rapid capacity fade during high-voltage cycling. Several mechanisms have been proposed to explain the capacity fade, including intragranular fracture caused by the P2-O2 phase transion, surface structural change, and irreversible lattice oxygen release. Here we systematically investigated the morphological, structural, and chemical changes of P2-NNMO during high-voltage cycling using a variety of characterization techniques. It was found that the lattice distortion and crystal-plane buckling induced by the P2-O2 phase transition slowed down the Na-ion transport in the bulk and hindered the extraction of the Na ions. The sluggish kinetics was the main reason in reducing the accessible capacity while other interfacial degradation mechanisms played minor roles. Our results not only enabled a more complete understanding of the capacity-fading mechanism of P2-NNMO but also revealed the underlying correlations between lattice doping and the moderately improved cycle performance.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
National Natural Science Foundation of China; Natural Science Foundation of Shanghai; Science & Technology Commission of Shanghai Municipality; Sichuan Science and Technology Program; U.S. Department of Energy; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1872109
Journal Information:
Journal of Energy Chemistry, Journal Name: Journal of Energy Chemistry Vol. 69; ISSN 2095-4956
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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