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Title: Core–shell-structured Li3V2(PO4)3 –LiVOPO4 nanocomposites cathode for high-rate and long-life lithium-ion batteries

Journal Article · · RSC Advances
DOI:https://doi.org/10.1039/C6RA26790D· OSTI ID:1344223
 [1];  [1];  [1];  [1];  [2];  [3];  [4];  [5];  [2]
  1. Southeast Univ., Nanjing (China). Dept. of Physics
  2. Southeast Univ., Nanjing (China). College of Chemistry and Chemical Engineering
  3. Southeast Univ., Nanjing (China). College of Chemistry and Chemical Engineering; Nanjing Univ. (China). National Lab. of Solid State Microstructures
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
  5. Southeast Univ., Nanjing (China). Dept. of Physics; Southeast Univ., Nanjing (China). College of Chemistry and Chemical Engineering

A facile strategy has been developed to construct unique core–shell-structured Li2.7V2.1(PO4)3 nanocomposites with a Li3V2(PO4)3 core and LiVOPO4 shell by using nonstoichiometric design and high-energy ball milling (HEBM) treatment. The HEBM treatment supplies enough energy to drive the excess V atoms to the surface to form a V-enriched shell. Such kind of cathode can deliver a high reversible capacity of 131.5 mAhg$$-$$1 at 0.5 C, which is close to the theoretical capacity (133 mAhg$$-$$1 in 3.0–4.3 V). Even at 20 C, it still delivers an excellent discharge capacity of 116.3 mAhg$$-$$1, and a remarkable capacity of 111.0 mAhg$$-$$1 after 1000 cycles, corresponding to an ultra-small capacity-loss of 0.0046% per cycle. Finally, the significantly improved high-rate electrochemical performance can be attributed to the active shell of LiVOPO4, which not only efficiently facilitates the electron and Li+ ion transport during cycling processes, but also accommodates more Li+ ions to effectively compensate the capacity loss of the core.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1344223
Report Number(s):
BNL-113494-2017-JA; RSCACL; R&D Project: 16060; 16060
Journal Information:
RSC Advances, Vol. 7, Issue 6; ISSN 2046-2069
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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