Vapor pressure-assisted synthesis of chemically bonded TiO2/C nanocomposites with highly mesoporous structure for lithium-ion battery anode with high capacity, ultralong cycling lifetime, and superior rate capability

Ge nanocrystals tightly and uniformly distributed in a carbon matrix through nitrogen and oxygen bridging bonds for fast-charging high-energy-density lithium-ion batteries

“…(v) Bridge effect of N and O atoms between Ge and C via Ge-O-C and Ge-N-C bonds can heighten interfacial structural stability to ease volume expansion. 13,26 The cyclability at high current density is also investigated. High capacities of 1095.3 mAh g -1 with 98.8% capacity retention after 1000 cycles at 2 C ( Fig.…”

“…S2 high scanning rate, which may be from additional Li + storage site, such as defects, 26,29 phase boundaries, 8,26,28,29 and mesoporous structure. 12,26,29 The rate curves (Fig. 3g) (Fig.…”

One-step vapor-pressured induced synthesis of spherical-like Co9S8/N, S-codoped carbon nanocomposites with superior rate capability as lithium-ion-battery anode

“…The rate capability of Co 9 S 8 /NSC was tested at 0.1, 0.2, 0.5, 1, 2, 5, 10, and 20 A g -1 (Figure 3f), which delivers the capacities of 992.2, 950.6, 889.2, 792.9, 664.1, 577.8, 491.4 and 329.8 mAh g -1 , respectively, and the capacity can be back to 976.2 mAh g -1 when the current density returns to 0.1 A g -1 to testify superior rate performance. The outstanding lithium ion storage performances mainly are attributed to its unique structural advantages, such as smaller particle size of Co 9 S 8 , NSC coating layers, and formation of interfacial chemical bonds of Co-N-C and Co-S-C. [11][12][13] To confirm ion storage mechanism and determine specific capacity contribution of the Co 9 S 8 /NSC, the electrochemical kinetics and pseudocapacitive contribution are surveyed by CV curves at different scanning rates (v). The CV (Figure 4a) curves display similar Li + storage behavior at v of 0.2 to 1 mV s -1 to confirm a stable pseudocapacitive behavior.…”

“…logi = blogv + loga. [13][14][15] It can be obtained that the b is the slope of logi-logv plots, which is 1.0 to suggest a capacitive-controlled process and is 0.5 to indicate a diffusion-dominated process. It can be seen that b value is 0.84-0.88 for the two peaks (Figure 4b) to exhibit that both the diffusioncontrolled and pseudocapacitive-controlled process contribute the total capacity.…”

Three-dimensional clusters of peony-shaped CuO nanosheets as a high-rate anode for Li-ion batteries

“…The calculated b values are 0.514 (peak 1), 0.642 (peak 2) and 0.674 (peak 3), respectively, demonstrating a hybrid electrochemical process inuenced by both diffusion-controlled and pseudocapacitive behavior. In addition, the relative contributions from the capacitive effect (k 1 v) and the diffusion behavior (k 2 v 1/2 ) at a constant voltage can be calculated by the following equation: 34,35 i(…”