Realizing Three‐Electron Redox Reactions in NASICON‐Structured Na3MnTi(PO4)3 for Sodium‐Ion Batteries

By Ting Zhu, P. Hu, Xuanpeng Wang, Zhenhui Liu, Wen Luo, K. Owusu, Weiwei Cao, Changwei Shi, Jiantao Li, Liang Zhou and 1 more. Advanced Energy Materials, 2019

227 citations recorded by the source corpus.

Developing multielectron reaction electrode materials is essential for achieving high specific capacity and high energy density in secondary batteries; however, it remains a great challenge. Herein, Na3MnTi(PO4)3/C hollow microspheres with an open and stable NASICON framework are synthesized by a spray‐drying‐assisted process. When applied as a cathode material for sodium‐ion batteries, the resultant Na3MnTi(PO4)3/C microspheres demonstrate fully reversible three‐electron redox reactions, corresponding to the Ti3+/4+ (≈2.1 V), Mn2+/3+ (≈3.5 V), and Mn3+/4+ (≈4.0 V vs Na+/Na) redox couples. In situ X‐ray diffraction results reveals that both solid‐solution and two‐phase electrochemical reactions are involved in the sodiation/desodiation processes. The high specific capacity (160 mAh g−1 at 0.2 C), outstanding cyclability (≈92% capacity retention after 500 cycles at 2 C), and the facile synthesis make the Na3MnTi(PO4)3/C a prospective cathode material for sodium‐ion batteries.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/ff09c38e634e4dcb157eebbbd1c0d3bd724ff4bd