Journal
JOURNAL OF POWER SOURCES
Volume 389, Issue -, Pages 240-248Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.03.071
Keywords
Spinel LiNi0.5Mn1.5O4; Solid-state electrolyte coating; LATP; LiNi0.5Mn1.5O4/Li4Ti5O12 full-cell; Low-temperature performance
Funding
- National Natural Science Foundation of China [51372136]
- NSFC-Guangdong united fund [U1401246]
Ask authors/readers for more resources
Octahedral cathode materials LiNi0.5Mn1.5O4 (LNMO), with primary particles size of 300-600 nm are prepared through one-step co-precipitation. Then solid-state electrolyte LiO-Al2O3-TiO2-P2O5 (LATP) was coated on LNMO to form continuous surface-modification layer. There is no obviously difference of structure, morphology between coated LATP LiNi0.5Mn1.5O4 (LATP-LNMO) and pristine LiNi0.5Mn1.5O4 (P-LNMO). Low-temperature electrochemical performance of P-LNMO and LATP-LNMO electrodes, including charge-discharge capacity, cycle performance, middle discharge voltage and electrochemical impedance spectra (EIS), were measured systematically with three electrode. The results reveal that LATP-LNMO electrode presents superior electrochemical performance at low temperature, compared to P-LNMO electrode. At -20 degrees C, the capacity retention of LATPLNMO (61%) is much higher than that of P-LNMO (39%). According to EIS, the enhancement of performance of LATP-LNMO cathode at low temperature can be attribute to LATP coating, which not only promotes lithium-ion diffusion at electrode/electrolyte interface but also decreases the charge transfer resistance. Finally, the electrochemical performances of full cell of LATP-LNMO or P-LNMO cathode vs Li4Ti5O12 anode are investigated. The energy density can be achieved to 270 Wh center dot Kg(-1) at -20 degrees C if using LATP-LNMO, which is much better than that of P-LNMO.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available