A reversible copper extrusion-insertion electrode for rechargeable Li batteries.
Although widely used, the most promising Li-based technologies still suffer from a lack of suitable electrodes. There is therefore a need to seek new materials concepts to satisfy the increasing demands for energy storage worldwide. Here we report on a new layered electrode material, Cu(2.33)V(4)O(11), which shows a sustainable reversible capacity of 270 mA h g(-1) at a voltage of about 2.7 V, and electrochemically reacts with Li in an unusual and spectacular way. The reaction entails a reversible Li-driven displacement process leading to the growth and disappearance of Cu dendrites with a concomitant reversible decomposition and recrystallization of the initial electrode material. We show from structural considerations that the uniqueness of Cu(2.33)V(4)O(11) is rooted in the peculiar flexibility of the stacked [V(4)O(11)](n) layers, which is due to the presence of pivot oxygen atoms. Fully reversible displacement reactions could provide a new direction for developing an alternative class of higher energy density Li storage electrodes.
LRCS, Université de Picardie Jules Verne, 33 rue Saint Leu, 80039, Amiens, France.
M
M
Morcrette
P
P
Rozier
L
L
Dupont
E
E
Mugnier
L
L
Sannier
J
J
Galy
J-M
JM
Tarascon
D003300:Copper / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D011211:Electric Power Supplies; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004566:Electrodes; D004735:Energy Transfer; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008094:Lithium; D008420:Manufactured Materials; D008422:Materials Testing; D008968:Molecular Conformation; D011208:Powders; D013499:Surface Properties; D017968:Vanadium Compounds / Q000737:chemistry*
D011208:Powders; D017968:Vanadium Compounds; D003300:Copper; D008094:Lithium; C066075:vanadium pentoxide