Discharge–charge characteristics and performance of Li/FeOOH(an) battery with PAN-based polymer electrolyte

Hierarchically structured reduced graphene oxide/WO3 frameworks for an application into lithium ion battery anodes

“…Additionally, Li + ion diffusion coefficients for the electrodes can be derived from the slope (k w ) of Randles plots using the following Eq. (2) [34][35][36],…”

Microwave synthesis of copper network onto lithium iron phosphate cathode materials for improved electrochemical performance

“…Based on a semi-infinite diffusion model, the Warburg impedance (Z D ) in LFP electrode is expressed as Z D ¼ k w u À1/2 (1 À j) [26], in which k w is the Warburg coefficient and u (¼2pf) is the angular frequency (f). Thus, the Randles plots of re Z 0 vs. u À1/2 are made to determine the k w value from the slope of the linear plots [27], as depicted in Fig. 7(b).…”

Hierarchical Carbon Composites for High‐Energy/Power‐Density and High‐Reliability Supercapacitors with Low Aging Rate

“…The apparent diffusion coefficient (D a ) can be assessed from the sloping line at intermediate frequency of the Nyquist spectrum. [27,29] Table 1 also reveals that the AC-CNS 1.25 -CNT 1.25 cell has the highest D a value. This can be attributed to the fact that the open active sites created by the hierarchical CNS/CNT network (rather than the tortuous pores within AC) are more easily accessible.…”

“…The spectra are characterized by a semicircle (associated with interfacial contact resistance) at high frequency, a sloping line (associated with ion diffusion impedance within the electrode) at intermediate frequency, and a quasi-vertical line (associated with capacitive behavior) at low frequency. [27,28] The equivalent circuit used to fit the EIS data is shown in the figure inset. As shown in Table 1, the interfacial contact resistance (R inter ) values clearly vary with the CNS/CNT ratio.…”