2020
DOI: 10.1002/adfm.202008569
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Lithium‐Substituted Tunnel/Spinel Heterostructured Cathode Material for High‐Performance Sodium‐Ion Batteries

Abstract: Sodium manganese oxides as promising cathode materials for sodium‐ion batteries (SIBs) have attracted interest owing to their abundant resources and potential low cost. However, their practical application is hindered due to the manganese disproportionation associated with Mn3+, resulting in rapid capacity decline and poor rate capability. Herein, a Li‐substituted, tunnel/spinel heterostructured cathode is successfully synthesized for addressing these limitations. The Li dopant acts as a pillar inhibiting unfa… Show more

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Cited by 29 publications
(32 citation statements)
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“…Because high‐spin Mn 3+ induces Jahn–Teller distortion, appropriate heteroatom substitution is expected to improve the structural stability and reduce the dissolution of TMO 2 layers. [ 9 ] The Mn 3s exchange splitting (Δ E 3s ) in NM, NMFM, and NMFML are 4.92, 4.58, and 4.49 eV, respectively, further confirming the increase in the average oxidation state of Mn induced by the co‐doping strategy (Figure S3g, Supporting Information). [ 32 ] It is expected, based on charge balance theory, that NMFM and NMFML are richer in surface oxygen vacancies than NM.…”
Section: Resultsmentioning
confidence: 61%
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“…Because high‐spin Mn 3+ induces Jahn–Teller distortion, appropriate heteroatom substitution is expected to improve the structural stability and reduce the dissolution of TMO 2 layers. [ 9 ] The Mn 3s exchange splitting (Δ E 3s ) in NM, NMFM, and NMFML are 4.92, 4.58, and 4.49 eV, respectively, further confirming the increase in the average oxidation state of Mn induced by the co‐doping strategy (Figure S3g, Supporting Information). [ 32 ] It is expected, based on charge balance theory, that NMFM and NMFML are richer in surface oxygen vacancies than NM.…”
Section: Resultsmentioning
confidence: 61%
“…The direct imaging of the Li in NMFML by EDS is difficult because of its lightweight and weak electron‐beam‐scattering ability. [ 9 ] The above results indicate that NMFML consists of an intergrown P2/O3 biphasic structure rather than a simple mixture of P2 and O3 phases.…”
Section: Resultsmentioning
confidence: 84%
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“…[23,24] Besides, according to current reports, the spinelrelated-type structure could stabilize the host cathode structures and simultaneously play a crucial role in boosting electron transport for coordination with the timely sodium ion (de)sodiation, which is due to the excellent intrinsic conductivity and the inherent high stability. [25] Therefore, many researchers focus on composite structures on account of multifunctional advantages, especially for multiphase structures. [26] In addition, cathodes with high operating voltages are essential for the development of high-energy-density SIBs, but the cycling stability of cathodes is still a pressing issue.…”
mentioning
confidence: 99%