Novel Transition-metal-free Cathode for High Energy and Power Sodium Rechargeable Batteries
- Novel Transition-metal-free Cathode for High Energy and Power Sodium Rechargeable Batteries
- 임희대; 김해겸; 박영욱; 박규영; 강기석; 홍지현
- Issue Date
- Nano energy
- VOL 4-104
- A low-cost and high-performance energy storage device is a key component for sustainable energy utilization. Recently, sodium (Na) ion batteries have been highlighted as a possible competitor to lithium (Li) ion batteries due to their potential merit in the cost effectiveness. Na resources are earth-abundant, and Na electrochemistry shares many similarities with Li. However, their relatively low energy/power densities and unreliable cycle stability need to be addressed. Herein, we propose a novel high-performance cathode for Na rechargeable batteries based on mass-scalable functionalized graphite nanoplatelets. This new class cathode material can deliver a high energy of ~500 W h kg− 1 without noticeable capacity decay after 300 cycles. Furthermore, it can retain an energy of ~100 W h kg− 1 at a power of ~55 kW kg− 1 (less than 10-s charge/discharge), which is the highest among cathodes for Na ion batteries. This transition-metal-free high-performance cathode is expected to lead to the development of low-cost and high-performance Na rechargeable batteries.
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