Boosting fast energy storage by synergistic engineering of carbon and deficiency

Abstract

Exploring advanced battery materials with fast charging/discharging capability is of great significance to the development of modern electric transportation. Herein we report a powerful synergistic engineering of carbon and deficiency to construct high-quality three/ two-dimensional cross-linked Ti 2 Nb 10 O 29−x @C composites at primary grain level with conformal and thickness-adjustable boundary carbon. Such exquisite boundary architecture is demonstrated to be capable of regulating the mechanical stress and concentration of oxygen deficiency for desired performance. Consequently, significantly improved electronic conductivity and enlarged lithium ion diffusion path, shortened activation process and better structural stability are realized in the designed Ti 2 Nb 10 O 29−x @C composites. The optimized Ti 2 Nb 10 O 29−x @C composite electrode shows fast charging/discharging capability with a high capacity of 197 mA h g −1 at 20 C (∼3 min) and excellent long-term durability with 98.7% electron and Li capacity retention over 500 cycles. Most importantly, the greatest applicability of our approach has been demonstrated by various other metal oxides, with tunable morphology, structure and composition.

Coupling PEDOT on Mesoporous Vanadium Nitride Arrays for Advanced Flexible All‐Solid‐State Supercapacitors

“…Due to limited energy density, carbon materials are slowly coming out of favor for flexible supercapacitors. [15][16][17] Instead, pseudocapacitive materials (e.g., metal oxides, metal nitrides, metal sulfides) are becoming one of the favorites because of their high capacitance and energy density. [18][19][20][21] However, metal oxides and metal sulfides show poor intrinsic electronic conductivity, and thereby lead to compromised power/energy performance.…”

Anchoring SnS2 on TiC/C Backbone to Promote Sodium Ion Storage by Phosphate Ion Doping

“…Along with the deterioration of environment pollution and intensification of the energy crisis, exploring green and renewable technology for energy storage and conversion is becoming an urgent issue. [1][2][3] Despite great success in commercialization of lithium ion batteries (LIBs), [4][5][6] the high cost and scarcity application in SIBs because of their high theoretical capacity, high redox activity, and lamellar structure similar to graphite. Among these materials, SnS 2 featuring a typical CdI 2 -type crystal structure has been considered as a prospective candidate as anode for SIBs on account of its high specific capacity up to 1137 mAh g −1 , large interlamellar spacing of 0.59 nm, and low operation potential.…”

Coupling a Sponge Metal Fibers Skeleton with In Situ Surface Engineering to Achieve Advanced Electrodes for Flexible Lithium–Sulfur Batteries

“…Over the past decades, sustainable energy storage systems keep growing to meet the burgeoning demand of portable electronic devices, electric vehicles, and smart grids. [ 1–5 ] In response to this, new rechargeable batteries beyond ubiquitous Li‐ion batteries (LIBs) with higher energy density and lower production cost have taken the hold of world’s attention. [ 6–9 ] Among the next‐generation candidates, lithium–sulfur batteries (LSBs) show great promise due to their low gravimetric densities (Li: 0.534 g cm −3 ; S: 2.07 g cm −3 ), large theoretical capacities (Li: 3860 mA h g −1 ; S: 1675 mA h g −1 ), and high energy density (2600 W h kg −1 ).…”