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Electrochemical properties and evolution of the phase transformation behavior in the NASICON-type Na3+xMnxV2-x(PO4)3 (0⩽x⩽1) cathodes for Na-ion batteriesстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 24 сентября 2020 г.
- Авторы: Zakharkin Maxim V., Drozhzhin Oleg A., Ryazantsev Sergey V., Chernyshov Dmitry, Kirsanova Maria A., Mikheev Ivan V., Pazhetnov Egor M., Antipov Evgeny V., Stevenson Keith J.
- Журнал: Journal of Power Sources
- Том: 470
- Год издания: 2020
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 228231
- DOI: 10.1016/j.jpowsour.2020.228231
- Аннотация: NASICON-structured cathode materials are considered as possible candidates for high-performance Na-ion batteries. Further increase of energy density of the Na3V2(PO4)3 may be achieved by substitution of the V cations by other transition metals. Here, we show that a family of Na3+xMnxV2-x(PO4)3 (0≤x≤1, Δx=0.2) cathode materials demonstrates remarkable diversity of the electrochemical properties and phase transformations depending on degree of substitution and cut-off voltage. An intermediate “Na2M2(PO4)3” phase was found for all compounds studied by means of operando powder X-ray diffraction. When Mn content is low (x~0–0.4), it coexists with Na3+xMnxV2-x(PO4)3 or Na1+xMnxV2-x(PO4)3. Increase in Mn content extends the length of the solid solution region corresponding to sodiated, intermediate and desodiated phases. All Mn-substituted samples are characterized by additional high-voltage plateau (~3.9 V) at charge-discharge curves. Na3+xMnxV2-x(PO4)3 (x≥0.4) compositions exhibit 8–10% energy density gain in comparison to Na3V2(PO4)3 material, Na3.2Mn0.2V1.8(PO4)3 and Na3.4Mn0.4V1.6(PO4)3 are most preferable in terms of cycling stability.
- Добавил в систему: Дрожжин Олег Андреевич