Journal
ENERGY STORAGE MATERIALS
Volume 45, Issue -, Pages 389-398Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2021.11.041
Keywords
Sodium ion layered cathode oxides; Li-supersaturation; P2/Li-O3 intergrowth bi-phases; Shear-resistant interface; Cycling stability
Funding
- National Natural Science Foundation of China [51971250, 51304248, 21975154, 22179078, 11874199]
- National Key Research and Development Program of China [2018YFB0104200]
- Natural Science Foundation of Hunan Province [2020JJ5731]
- Innovation Program of Central South University [2016CXS003]
- State Key Laboratory of Powder Metallurgy at Central South University
- Hunan Shenghua Technology Co., Ltd.
- Fundamental Re-search Founds for the Central Universities of Central South University [2019zzts236]
- Support project for innovation and entrepreneurship training program for level 21 college students [2021105330154]
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Layered sodium transition metal oxides have potential as cathode materials for sodium-ion batteries. This study introduces a shear-resistant interface by using supersaturated lithium to inhibit phase transitions, improving cycling stability.
Layered sodium transition metal (TM) oxides exhibit great potential as high energy density cathode materials for sodium-ion batteries (SIBs). The large Na ions, nevertheless, adopts various coordination environments that are dependent of the sodium concentration, giving rise to cyclical gliding of TM layers and P-O phase transi-tions upon Na extraction/insertion process. The detrimental interlayer-gliding induced phase transformations lead to deteriorated round-trip energy efficiency, rate capability and cycling stability of electrodes. Herein, we demonstrate a shear-resistant interface via the supersaturation of lithium to overcome the interlayer-gliding be-havior and inhibit the multiple P-O phase transitions in P2-type Na0.67Mn0.67Ni0.33O2. The results indicate that the nanoscale interface is composed of lithium-enriched O3 nanodomains in the P2 phase matrix, resulting in smooth charge/discharge profiles and superior cycling stability of P2-type Na0.67Mn0.67Ni0.33O2 cathode under a high cut-off voltage of 4.5 V. This work highlights the concept of modulating the interfacial shear stress for improving the long-term cycling stability of high-voltage layered cathode materials that suffer from severe phase transformations.
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