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Abstract

Carbon materials, primarily based on low-priced and environmentally pleasant advantages, have been viewed as the most promising anode substances for sodium-ion batteries (SIBs). The improvement of superior carbon-based anode substances with excessive charge/discharge fees and lengthy biking steadiness is accelerating the software of SIBs in electricity storage systems. Here, nitrogen-doped double-shell hollow carbon sphere (DHCS) of tough carbon is designed and organized thru the structural tuning with the diameter close to 400 nm and shell thickness of about 20 nm. Such an engineered DHCS anode with sturdy structural integrity allows speedy and steady sodium ion storage, which can supply excessive capability above 113 mA h g−1 at 6 A g−1 excessive price and continue 143 mA h g−1 upon a thousand cycles at 0.6 A g−1.