Abstract
A lithium-rich nickel-manganese oxide compound Lix(Ni 0.25Mn0.75)Oy (x > 1) was synthesized from layered Na0.9Li0.3Ni0.25Mn0.75O δ precursor using a lithium ion-exchange reaction. The electrochemical behavior of the material as a cathode for lithium batteries, and a preliminary discussion of its structure are reported. The product Li 1.32Na0.02Ni0.25Mn0.75Oy (IE-LNMO) shows broad X-ray diffraction peaks, but possesses a high intensity sharp (003) layering peak and multiple peaks with intensity in the 20-23° 2θ region which suggest Ni-Mn ordering in the transition metal layer (TM). Li/IE-LNMO cells demonstrate very stable reversible capacities of 220 mAh/g @ 15 mA/g and possess extremely high power of 150 mAh/g @ 1500 mA/g (15C). The Li/IE-LNMO cell dQ/dV plot exhibits three reversible electrochemical processes due to Ni/Mn redox behavior in a layered component, and Mn redox exchange in a spinel component. No alteration in the dQ/dV curves and no detectable change in the voltage profiles over 40 cycles were observed, thus indicating a stable structure for lithium insertion/extraction. This new material is attractive for demanding Li-ion battery applications.
| Original language | English |
|---|---|
| Pages (from-to) | 1618-1621 |
| Number of pages | 4 |
| Journal | Electrochemistry Communications |
| Volume | 12 |
| Issue number | 11 |
| DOIs | |
| State | Published - Nov 2010 |
Funding
Financial support from the Office of Vehicle Technologies of the U.S. Department of Energy under Contract DE-AC02-06CH11357 is gratefully acknowledged. Work at PNC/XSD facilities at the Advanced Photon Source, and research at these facilities, are supported by the USDOE-Basic Energy Sciences, NSERC-Canada and its founding institutions. The submitted manuscript has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (“Argonne”). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357. The U.S. Government retains for itself, and others acting on its behalf, a paid-up, nonexclusive, irrevocable worldwide license in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the Government.
Keywords
- Ion exchange
- Lithium batteries
- Oxides
- Sodium