Journal
ACS ENERGY LETTERS
Volume 7, Issue 1, Pages 97-107Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c02107
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Funding
- Science and Technology Project of Inner Mongolia [2021GG0162]
- National Natural Science Foundation of China [51725206, 51872289, 52072370, 21878195, U20A20145]
- DNL Cooperation Fund, CAS [DNL201914]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21070500]
- Innovation Academy for Green Manufacture, CAS [IAGM2020C07]
- Distinguished Young Foundation of Sichuan Province [2020JDJQ0027]
- Key Research and Development Program of Sichuan Province, China [2020YFG0022]
- Science and Technology Achievement Transformation Project of Sichuan Province [21ZHSF0111]
- Research Foundation for the Sichuan University [2018CDZG-16]
- Distinguished Young Foundation of the state Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, China [SKLPME2020-3-02]
- Innovation and Entrepreneurship Talent Team Project of Shaoguan City, China [2019SG-23]
- Zigong City Joint research project, China [2018CDZG-16]
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In this study, a selective replacement of vanadium rather than manganese in the Na4VMn(PO4)(3) system was developed to enhance the anode performance and structural stability. Experimental results confirmed that the Al-substituted Na4V0.8Al0.2Mn(PO4)(3) anode exhibited favorable ion kinetics and structure stability.
A Mn-based NASICON-type Na4VMn(PO4)(3) cathode is considered to be one of the most promising substitutions for Na3V2(PO4)(3) due to the huge abundance and appropriate redox potential from Mn. However, the current Na4VMn(PO4)(3)/C cathode still delivers a limited electrochemical performance due to the sluggish kinetics and negative structural degradation caused by the Mn in the structure. Herein, a selective replacement of vanadium rather than manganese in the Na4VMn(PO4)(3) system was developed to fully utilize the manganese element and enhance the structural stability. Both experimental and calculation results affirmed that the Al-substituted Na4V0.8Al0.2Mn(PO4)(3) cathode shows favorable Na+ kinetics and structure stability. The resulting Na4V0.8Al0.2Mn(PO4)(3) reveals a discharge capacity of similar to 84 mA h g(-1) at 40 C and renders a capacity retention of 92% after cycling 1000 times at 5 C. Inspired by the availability of Al dopants, we also demonstrated the Al-doped Mn-richer Na4.2V0.6Al0.2Mn1.2(PO4)(3) to be a viable candidate for Mn-rich phosphate cathodes.
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