Core–shell-structured Li3V2(PO4)3 –LiVOPO4 nanocomposites cathode for high-rate and long-life lithium-ion batteries
- Southeast Univ., Nanjing (China). Dept. of Physics
- Southeast Univ., Nanjing (China). College of Chemistry and Chemical Engineering
- Southeast Univ., Nanjing (China). College of Chemistry and Chemical Engineering; Nanjing Univ. (China). National Lab. of Solid State Microstructures
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
- 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
Web of Science
Off-stoichiometric Na 3−3x V 2+x (PO 4 ) 3 /C nanocomposites as cathode materials for high-performance sodium-ion batteries prepared by high-energy ball milling
|
journal | January 2018 |
Similar Records
Nonstoichiometry and Defects in Hydrothermally Synthesized ε-LiVOPO 4
Role of disorder in limiting the true multi-electron redox in ε-LiVOPO4