Layered P3-NaxCo1/3Ni1/3Mn1/3O2 versus Spinel Li4Ti5O12 as a Positive and a Negative Electrode in a Full Sodium-Lithium Cell.
The development of lithium and sodium ion batteries without using lithium and sodium metal as anodes gives the impetus for elaboration of low-cost and environmentally friendly energy storage devices. In this contribution we demonstrate the design and construction of a new type of hybrid sodium-lithium ion cell by using unique electrode combination (Li4Ti5O12 spinel as a negative electrode and layered Na3/4Co1/3Ni1/3Mn1/3O2 as a positive electrode) and conventional lithium electrolyte (LiPF6 salt dissolved in EC/DMC). The cell operates at an average potential of 2.35 V by delivering a reversible capacity of about 100 mAh/g. The mechanism of the electrochemical reaction in the full sodium-lithium ion cell is studied by means of postmortem analysis, as well as ex situ X-ray diffraction analysis, HR-TEM, and electron paramagnetic resonance spectroscopy (EPR). The changes in the surface composition of electrodes are examined by ex situ X-ray photoelectron spectroscopy (XPS).
Svetlana
S
Ivanova
Ekaterina
E
Zhecheva
Rositsa
R
Kukeva
Diana
D
Nihtianova
Faculty of Chemistry and Pharmacy, Sofia University , 1164 Sofia, Bulgaria.
Lyuben
L
Mihaylov
Genoveva
G
Atanasova
Radostina
R
Stoyanova
EPR spectroscopy; TEM analysis; hybrid sodium−lithium ion batteries; layered sodium transition metal oxides; lithium and sodium intercalation; lithium ion batteries; lithium titanium spinel oxide; sodium ion batteries