Facile synthesis of LiCoO2 nanowires with high electrochemical performance

Abstract

Cobalt precursor Co(CO 3 ) 0.35 Cl 0.2 (OH) 1.1 nanowire bunches have been synthesized by a hydrothermal method and transformed into Co 3 O 4 nanowires by calcination at 500 °C for 3 h. The Co 3 O 4 nanowires were then mixed with LiOH and formed the LiCoO 2 nanowires by calcination at 750 °C . High resolution transmission electron microscopy revealed that the LiCoO 2 nanowires were composed of nanoparticles with most of the nanoparticles having exposed (010) planes. The electrochemical performance of the LiCoO 2 nanowires was thoroughly investigated by galvanostatic tests. The as-prepared LiCoO 2 nanowires exhibited excellent rate capability and satisfactory cycle stability, where the charge and discharge capacity still stabilized at 100 mA·h/g at a rate of 1000 mA/g after 100 cycles. The favorable electrochemical performance of the LiCoO 2 nanowires may result from their one-dimensional nanostructure and the exposure of (010) planes, since the (010) plane is electrochemically active for layered LiCoO 2 with the α-NaFeO 2 structure and favors fast Li + transportation.

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

“…While there has been a distinct move for alternative electrode hosts (LiCoO2 is both toxic and relatively expensive to produce), research has still considered a number of practical LiCoO2 architectures with high voltage and good rate performance [249][250][251][252][253][254][255][256][257]. In the interest of capacity retention, commercial LiCoO2 cells typically adopt a reversible capacity to 0.5 Li + by setting the upper-cut off potential to 4.2 V, thus yielding working capacities approaching 150 mA h g -1 [258].…”

Facial-shape controlled precursors for lithium cobalt oxides and the electrochemical performances in lithium ion battery

“…Several previous studies reported that controlling morphology or trimming nanostructures of LiCoO 2 cathodes could be a method to improve their rate capability [18,23,24]. Hence, we also focus on the C-rate performance (Fig.…”

“…polyhedral and spherical LiCoO 2 particles, exhibited different electrochemical performances, indicating that lithium intercalation/deintercaltion dynamics might be crystal face-sensitive. The same research group also synthesized LiCoO 2 nanowires, which had the one-dimensional nanostructure and exposure of (010) planes, from Co 3 O 4 nanowires as precursors [18]. They showed that these LiCoO 2 nanowires exhibited the good electrochemical performances, especially, the rate capability.…”

Nanotechnology for Energy Storage

“…HTS offers other advantages over conventional ceramic methods. All forms of nanoscale materials can be prepared, namely nanopowders [51], nanofibers [52], nanobelts [53], nanoplates [54], nanowires [55], nanorods [56], nanovesicles [57], etc. The use of inexpensive, environmentally benign water as a solvent offers a "green" manufacturing approach for large-scale production of Li(Fe,Mn)PO 4 /C cathodes for high-power hybrid electric vehicle and plug-in hybrid electric vehicle applications.…”