Carbonate anion controlled growth of LiCoPO4/C nanorods and its improved electrochemical behavior

Abstract

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Heating the carbonate rich precursor in an inert atmosphere produces a Co 2 P phase that is conductive. Addition of super P carbon resulted in an amorphous carbon coating on LiCoPO 4 particles. LiCoPO 4 /C nanorods with a co-existence of Co 2 P exhibit excellent discharge capacity with retention on multiple cycling. AbstractLiCoPO 4 /C nanocomposite with growth controlled by carbonate anions was synthesized via a unique solid-state fusion method. Carbonate anions in the form of H 2 CO 3 or a mixture of H 2 CO 3 + (NH 4 ) 2 CO 3 have been used as a growth inhibiting modifier to produce morphology controlled lithium cobalt phosphate. The presence of cobalt phosphide (Co 2 P) as a second phase improved the conductivity and electrochemical properties of the parent LiCoPO 4. The formation of Co 2 P is found to be achievable only in

Influence of gradual cobalt substitution on lithium nickel phosphate nano-scale composites for high voltage applications

“…9, it can be seen that LiCoPO 4 /C electrode exhibited a remarkable reduction peak around 4.64 V and an oxidation peak around 4.98 V can be ascribed to the Co 3+ -Co 2+ redox couple, which resembles to the previous reports [11,44,46]. Fig.…”

Sur‐/Interface Engineering of Hierarchical LiNi0.6Mn0.2Co0.2O2@LiCoPO4@Graphene Architectures as Promising High‐Voltage Cathodes toward Advanced Li‐Ion Batteries

“…Notely, there is only one well‐defined O 1s peak at ≈531.09 eV for the LCP, in good line with the reported refs. and . As for the LNMC, there also exists another peak at ≈531.09 eV, resulting from some surface impurities (such as Li 2 CO 3 , LiOH), except for the lattice oxygen contribution.…”

“…X‐ray photoelectron spectroscopy (XPS) analysis is next performed to investigate the chemical oxidation states of sur‐/interfacial metal elements, as depicted in Figure . As seen from Figure a, no discernable P 2p peak is found for the LNMC, while a distinct P 2p at binding energy (BE) of ≈134.1 eV emerges for the LNMC@LCP‐1@G, which is almost identical to the LCP, suggesting the P ( IV ) related to the oxidation state of phosphate on the LNMC@LCP‐1@G surface . Another powerful evidence for the uniform distribution of olivine‐type LCP, as presented in Figure b, is the BE change in O 1s.…”

Improving the electrochemical kinetics of lithium manganese phosphate via co-substitution with iron and cobalt

“…Accordingly, peaks located at binding energy of 641.1, 712.3 and 781.5 eV are corresponding to Mn 2+ , Fe 3+ and Co 2+ respectively (Fig. 8b-d) [26][27][28]. As the redox potential of Mn 2+ / Mn 3+ and Co 2+ /Co 3+ occurs at 4.1 V and 4.8 V respectively, the charge capacity of $8.04 mA h g À1 obtained up to 4 V corresponds to the oxidation of Fe 2+ .…”