期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 818, 期 -, 页码 10-18出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2018.04.011
关键词
Prussian blue analogues; Sodium-ion batteries; Aqueous electrolyte; Cathode; Nickel substitution
资金
- Fundamental Research Funds for the Central Universities [NJ2016058]
- Prospective Joint Research Project of Cooperative Innovation Fund of Jiangsu Province, China [BY2016003-13]
- National Program on Key Basic Research Project of China [2014CB239701]
- Funding for Outstanding Doctoral Dissertation in NUAA [BCXJ16-07]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Na-rich NaxFeFe(CN)(6) (NFF) in terms of low cost and high theoretical capacity has been considered to be a potential cathode material for aqueous sodium ion batteries (SIBs). However, low sodium content, poor Columbic efficiency (CE) and rapid capacity degradation impede their practical application. Herein, the effect of low-level Ni doping in NFF as cathode materials in 1 M NaNO3 electrolyte has been investigated, which were synthesized via a citrate-assisted co-precipitation route. NFF substituted with 23% Ni2+ exhibited the best electrochemical behaviors, which delivers a discharge capacity of 105.9 mAh g(-1) at 200 mA g(-1) and 73.1% capacity retention over 1000 cycles with an average CE of 99.8% at 1000 mA g(-1). A reversible capacity of 55.5 mAh g(-1) can be obtained even at a high current density of 2000 mA g(-1). The Ni substitution strategy was evidenced to be a scalable method to prepare promising cathode materials with excellent cycling stability for high-performance aqueous SIBs.
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