Capacitive contribution matters in facilitating high power battery materials toward fast-charging alkali metal ion batteries

Understanding the electrochemical reaction mechanism to achieve excellent performance of the conversion-alloying Zn2SnO4 anode for Li-ion batteries

“…S3. † 56,57 As expected for the conversion reaction, 56 the character of the process is hybrid (b parameter equal to 0.87( 5)), both pseudo-capacitive and diffusion controlled. Interestingly, while for the (de-)alloying reaction the Li-storage is still mixed, it is more diffusion controlled than in the case of conversion (smaller b = 0.66( 6)).…”

“…The analysis of this phenomenon was based on CV data recorded at different scan rates and is presented in Fig. S3 † 56,57 . As expected for the conversion reaction, 56 the character of the process is hybrid ( b parameter equal to 0.87(5)), both pseudo-capacitive and diffusion controlled.…”

Designing Capacitive Contribution in Hard Carbon Materials for Balancing Energy and Power under High Current Density for Sodium-Ion Batteries

“…With the help of thermodynamic knowledge, it can be visually observed that the ε and P of the battery are positively related to the energy ( E ) provided by electrode materials under electrochemical reaction . On this premise, the energy density (ε 1 ) and power density ( P 1 ) of the battery (or materials), in which capacitive contribution is introduced into electrode materials, will vary with the capacitive ratio due to the different energies provided by the battery ( E B ) and supercapacitor ( E S ) parts. , The calculation formulas of ε 1 and P 1 can be obtained by combining electrochemical fundamentals and thermodynamic processes by means of mathematical thinking; the detailed derivations are as follows ε = E m 0.25em italicor 0.25em V E normalB = italicqU = ε normalB E normalS = 1 2 italicqU = ε normalS q = italicit Theoretically, the ε of the battery and supercapacitors can be calculated by ε B = CU and ε S = 1/2 CU 2 , respectively. On the other hand, the ε of an energy storage system also can be obtained by dividing the E provided by the electrode material by its mass or volume (eq ).…”

“…26 On this premise, the energy density (ε 1 ) and power density (P 1 ) of the battery (or materials), in which capacitive contribution is introduced into electrode materials, will vary with the capacitive ratio due to the different energies provided by the battery (E B ) and supercapacitor (E S ) parts. 11,27 The calculation formulas of ε 1 and P 1 can be obtained by combining electrochemical fundamentals and thermodynamic processes by means of mathematical thinking; 28 the detailed derivations are as follows E m or V =…”

Convenient Construction of CuO/Ti3C2Tx Heterojunction with Strong Charge Transfer and Li Intercalation for Superior Lithium Storage

“…For the four prominent redox peaks located at ∼1.2, 0.5, 1.9, and 2.9 V, the linear fittings between peak current ( i , mA) and scan rate ( v , mV s –1 ) are further revealed by the power-law relationship as described in eqs and i = a v b log false( i false) = b log false( v false) + log false( a false) i false( v false) = k 1 v + k 2 v 1 / 2 where a and b are constants and k 1 and k 2 are the calculated coefficients. Specifically, if the b value is between 0.5 and 1, the charge storage mechanism is cocontrolled by both diffusion and capacitance. , As a result, the lithium storage mechanism of CuO/MXene is a cocontrolled hybrid behavior and prefers the surface capacitive property based on the fact that the slopes fall between 0.7 and 0.9 in Figure d. Subsequently, the diffusion contribution ( k 1 v ) and the capacitance-driven contribution ( k 2 v 1/2 ) are further quantitively estimated according to eq .…”