Journal
CHEMICAL ENGINEERING JOURNAL
Volume 412, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.128719
Keywords
Sodium-ion batteries; Layered oxide cathodes; Structure modulation; Chemical substitution; Electrochemistry
Categories
Funding
- National Natural Science Foundation of China [U20A20145, 21878195, 21805198, 21805018]
- National Postdoctoral Program for Innovative Talents [BX20200222]
- China Postdoctoral Science Foundation [2020M682878]
- National Key RAMP
- D Program of China [2017YFB0307504]
- College-Enterprise Cooperation Project of Sichuan University [19H0628, 18H0357]
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This study introduces a stable Co-free P2-Na2/3Li1/9Ni2/9Mn2/3O2 cathode material with high hydrostability and excellent performance, demonstrating outstanding rate capability and cycling stability under the multifaceted strategy of chemical substitution and structure modulation.
As one of the most prospective transitional metal oxide cathode materials for sodium-ion batteries (SIBs), P2-type Na2/3Ni1/3Mn2/3O2 layered oxide generally suffers from sluggish Na+ kinetics and complicated structural evolution. Here, a stable Co-free P2-Na2/3Li1/9Ni2/9Mn2/3O2 cathode material with multilayer oriented stacking nanoplates is reported, which exhibits high hydrostability realized by partial Li element substitution for Ni. A prominent rate capability (71.7% capacity retention at 5 C compared to 0.2 C), an excellent cycling stability (78.7% capacity retention at 2 C after 300 cycles) and a promoted performance even at a higher cutoff potential of 4.4 V were displayed owing to bifunctional strategy of chemical substitution coupled with structure modulation, and the as-synthesized material retains its original structure and electrochemical performance after being aged in water. Moreover, dominant Na+ capacitive storage mechanism, high thermostability and complete solidsolution reaction are explicitly elucidated through quantitative calculation of electrochemical kinetics and in-situ X-ray diffraction technique. These findings reveal the importance of rational chemical substitution and structure modulation strategy, and inspire novel design of high-performance cathode materials for rechargeable SIBs.
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