Fig. 12.

a Schematic diagram of preparation of CNFF. SEM images of b CNFF and c CNFs. d TEM image of CNFF. e Long-term cycling performance of CNFF electrode at three current densities. The battery rested for 10 days before using different current density. Reproduced with permission from Ref. [225]. Copyright 2018, American Chemical Society. f SEM image of HINCA and its tetrapod center (inset). SEM images of g the tetrapod-joint cross section and h a tetrapod-unit broken arm. i Neuron structural Cartoon. j Charge/discharge curves of the 1^st cycle at 0.1 C (28 mA g⁻¹). k). Long cycle performance of the HINCA-type product at 1 C. Reproduced with permission from Ref. [226]. Copyright 2018, American Chemical Society