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Synergistic Coupling Effect of Electronic Conductivity and Interphase Compatibility on High-Voltage Na3V2(PO4)2F3 Cathodes

Journal Article · · ACS Sustainable Chemistry & Engineering
 [1];  [2];  [3];  [4];  [1];  [5]
  1. Hebei Univ. of Technology, Tianjin (China)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  3. Tianjin Univ. of Technology, Tianjin (China)
  4. China Electronics Technology Group Corporation, Beijing (China)
  5. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
+ Show Author Affiliations

Na3V2(PO4)2F3 (NVPF) has been considered an up-and-coming cathode material candidate for sodium (Na) ion batteries in light of its high specific capacity and working voltage. However, an erratic cathode/electrolyte interface layer is inevitably formed, accompanied by continuous electrolyte decomposition on the NVPF surface, when the voltage exceeds 4.2 V vs Na+/Na. Herein, the interphase features of NVPF are obviously enhanced owing to the ameliorated electronic conductivity obtained by combining it with carbon nanotubes (CNT). The NVPF with 3 wt % CNT (NVPF@3% CNT) reduces the Na+ diffusion kinetic energy barrier and electron transport resistance. Furthermore, the conducting network formed by CNT with sturdy structure strength can promptly accommodate the volumetric changes during sequential Na+ extraction/insertion and thus effectively improve the long-term cyclic performance of NVPF/hard carbon full cells. The initial discharge capacity approaches 105 mA h g–1 at 0.5C, and it retains 94% capacity retention after 200 cycles at the temperature of –10 °C. The cathode/electrolyte interphase characterization results further demonstrate that the interphase layer on the NVPF@3% CNT cathode is thinner and more compact compared with pristine samples. Here, this research provides a competitive strategy to facilitate the interfacial compatibility between the NVPF and electrolytes and accelerate the commercialization of high-performance Na-ion batteries.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1999012
Journal Information:
ACS Sustainable Chemistry & Engineering, Vol. 11, Issue 35; ISSN 2168-0485
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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25 ENERGY STORAGE
sodium-ion batteries
cathode/electrolyte interphase
Na3V2(PO4)2F3 cathode
electronic conductivity
carbon nanotubes