A novel biodegradable PHBV-based polyurethane was designed and synthesized by using PHBV, MDI and PEG.

A ropelike LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) fiber with superior rate capability and cycling stability was successfully synthesized via electrospinning and sintering as a cathode material for Li-ion batteries. The NCA fiber that exhibited excellent electrochemical performance as a cathode for Li-ion batteries was stacked and assembled from numerous nanoparticles. The NCA fiber delivered a high reversible capacity of 206.4 mAh g −1 at 0.1 C, and maintained 75% capacity retention after 100 cycles at 1 C. The high rate capability and outstanding cyclic stability were due to the ropelike fiber structure that shorten the Li + diffusion path, improved the Li + diffusion coefficient, and maintained the fiber structure during cycling.

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