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Highly-dispersed 10 wt% FePO 4 (FP)-coated LiCo 0.90 Ti 0.05 PO 4 (LCTP) was successfully synthesized within a multiwalled carbon nanotube matrix via our original ultracentrifugation process. 10 wt% FP-coated LCTP sample showed a higher discharge capacity of 116 mA h g -1 together with stable cycle performance over 99% of capacity retention at the 100 th cycle in high voltage. A combination of TEM, XRD, XPS, and XAFS analyses suggests that (i) Ti 4+ -substitution increases the utilization of Co redox (capacity increase) in LCP crystals by suppressing the Co 3 O 4 formation and creating the vacancies in Co sites, and (ii) the FP-coating brought about the Fe enrichment of the surface of LCTP which prevents an irreversible crystal structure change and electrolyte decomposition during cycling, resulting in the stable cycle performance.

rsc advances

The origin of stability and high Co2+/3+ redox utilization for FePO4-coated LiCo0.90Ti0.05PO4/MWCNT nanocomposites for 5 V class lithium ion batteries