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An easy sol–gel method was devised to synthesize the carbon-wrapped Na0.67Ni0.17Ti0.67Co0.17O2 nanoparticles (NNTC/C), which served as anode material in the new type of sodium-ion batteries. Functioned as the sodium storage medium, the NNTC/C exhibited initial discharge/charge capacities of 122/110 mA h g−1 at the rate of 0.2 C in the voltage range of 0.2–2.5 V with capacity retention of almost 82%...
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