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Utilizing Co2+/Co3+ Redox Couple in P2-Layered Na0.66Co0.22Mn0.44Ti0.34O2 Cathode for Sodium-Ion Batteries.


ABSTRACT: Developing sodium-ion batteries for large-scale energy storage applications is facing big challenges of the lack of high-performance cathode materials. Here, a series of new cathode materials Na0.66Co x Mn0.66-x Ti0.34O2 for sodium-ion batteries are designed and synthesized aiming to reduce transition metal-ion ordering, charge ordering, as well as Na+ and vacancy ordering. An interesting structure change of Na0.66Co x Mn0.66-x Ti0.34O2 from orthorhombic to hexagonal is revealed when Co content increases from x = 0 to 0.33. In particular, Na0.66Co0.22Mn0.44Ti0.34O2 with a P2-type layered structure delivers a reversible capacity of 120 mAh g-1 at 0.1 C. When the current density increases to 10 C, a reversible capacity of 63.2 mAh g-1 can still be obtained, indicating a promising rate capability. The low valence Co2+ substitution results in the formation of average Mn3.7+ valence state in Na0.66Co0.22Mn0.44Ti0.34O2, effectively suppressing the Mn3+-induced Jahn-Teller distortion, and in turn stabilizing the layered structure. X-ray absorption spectroscopy results suggest that the charge compensation of Na0.66Co0.22Mn0.44Ti0.34O2 during charge/discharge is contributed by Co2.2+/Co3+ and Mn3.3+/Mn4+ redox couples. This is the first time that the highly reversible Co2+/Co3+ redox couple is observed in P2-layered cathodes for sodium-ion batteries. This finding may open new approaches to design advanced intercalation-type cathode materials.

SUBMITTER: Wang QC 

PROVIDER: S-EPMC5700635 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature

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Utilizing Co<sup>2+</sup>/Co<sup>3+</sup> Redox Couple in P2-Layered Na<sub>0.66</sub>Co<sub>0.22</sub>Mn<sub>0.44</sub>Ti<sub>0.34</sub>O<sub>2</sub> Cathode for Sodium-Ion Batteries.

Wang Qin-Chao QC   Hu Enyuan E   Pan Yang Y   Xiao Na N   Hong Fan F   Fu Zheng-Wen ZW   Wu Xiao-Jing XJ   Bak Seong-Min SM   Yang Xiao-Qing XQ   Zhou Yong-Ning YN  

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20170706 11


Developing sodium-ion batteries for large-scale energy storage applications is facing big challenges of the lack of high-performance cathode materials. Here, a series of new cathode materials Na<sub>0.66</sub>Co <i><sub>x</sub></i> Mn<sub>0.66-</sub><i><sub>x</sub></i> Ti<sub>0.34</sub>O<sub>2</sub> for sodium-ion batteries are designed and synthesized aiming to reduce transition metal-ion ordering, charge ordering, as well as Na<sup>+</sup> and vacancy ordering. An interesting structure change  ...[more]

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