The origin of stability and high Co 2+/3+ redox utilization for FePO 4 -coated LiCo 0.90 Ti 0.05 PO 4 /MWCNT nanocomposites for 5 V class lithium ion batteries - Archive ouverte HAL
Journal Articles RSC Advances Year : 2022

The origin of stability and high Co 2+/3+ redox utilization for FePO 4 -coated LiCo 0.90 Ti 0.05 PO 4 /MWCNT nanocomposites for 5 V class lithium ion batteries

Abstract

Highly-dispersed 10 wt% FePO4 (FP)-coated LiCo0.90Ti0.05PO4 (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 100th cycle in high voltage. A combination of TEM, XRD, XPS, and XAFS analyses suggests that (i) Ti4+-substitution increases the utilization of Co redox (capacity increase) in LCP crystals by suppressing the Co3O4 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.
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hal-03937061 , version 1 (31-05-2023)

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Naohisa Okita, Etsuro Iwama, Yusuke Takami, Shingo Abo, Wako Naoi, et al.. The origin of stability and high Co 2+/3+ redox utilization for FePO 4 -coated LiCo 0.90 Ti 0.05 PO 4 /MWCNT nanocomposites for 5 V class lithium ion batteries. RSC Advances, 2022, 12 (40), pp.26192-26200. ⟨10.1039/D2RA03144B⟩. ⟨hal-03937061⟩
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