Non-carbon coating: a new strategy for improving lithium ion storage of carbon matrix

Abstract

A new strategy is proposed for a non-carbon film coating to improve the lithium storage of a porous biomass-derived carbon matrix.

Nitrate Salt Assisted Fabrication of Highly N-Doped Carbons for High-Performance Sodium Ion Capacitors

“…It is worth noting that the overlapping sheet-like morphology of DCDC-K can be retained but with slight reassembly after cycling, demonstrating a robust structure of DCDC-K. A massive electrochemical reaction product on the surface of carbon was found, which is interpreted with the formation of the SEI layer and is responsible for the low Coulombic efficiency in the initial cycles. 5,13 However, the DCDC-Li samples show a significant capacity fading during cycling, which can be attributed to its particulate-like morphology and unoptimized porosity caused by the weaker activation effect of lithium nitrate. A long-term cycling test is also carried out at a high current density of 10 A g −1 with DCDC-K (Figure 4e).…”

“…1−3 Lithium ion batteries have been commercially used due to their high energy density, acceptable cycling stability and good rate performance. 4,5 However, the huge consumption of lithium ion batteries may cause the exhaustion of lithium resources. Due to the features of abundance and the low cost of sodium resources, energy storage devices based on sodium ions have become a promising alternative to lithium-ion-based systems.…”

“…With the increasing concerns about environmental pollution and global energy demand, the development of electrochemical energy storage devices with high energy density and power density has drawn growing attention all over the world. − Lithium ion batteries have been commercially used due to their high energy density, acceptable cycling stability and good rate performance. , However, the huge consumption of lithium ion batteries may cause the exhaustion of lithium resources. Due to the features of abundance and the low cost of sodium resources, energy storage devices based on sodium ions have become a promising alternative to lithium-ion-based systems. − It is well-understood that rapid and reversible intercalation/deintercalation of sodium ions is more difficult in graphite than that of lithium ions, owing to the larger ion radius of Na + (0.102 nm of Na + vs 0.076 nm of Li + ).…”

Dual Hybrid Energy Storage Device with a Battery–Electrochemical Capacitor Hybrid Cathode and a Battery-Type Anode

“…For example, a thin metal or a metal oxide film coated on AC showed enhanced Li + storage capacity compared with the pure AC electrode. 25,27,28 A survey of literature shows that several efforts have been undertaken for using functionalized AC as a cathode material for BECHs, which is summarized toward the end of this article. In most of the composites, the surface properties are uncontrollable due to the disordered and random microstructures, which adversely affect the charge kinetics at the electrode−electrolyte interface and result in inferior charge storage.…”

Dehydration of Alginic Acid Cryogel by TiCl4 vapor: Direct Access to Mesoporous TiO2@C Nanocomposites and Their Performance in Lithium‐Ion Batteries

“…This was expected to produce a chemical modification of the AA before pyrolysis, and consequently to a significantly different carbon from that obtained by direct pyrolysis of nonmineralized AA. Moreover, few reports have concerned the advantages of lithium‐ion insertion into both TiO 2 (2.5 to 1.0 V vs. Li + /Li) or other metal oxides such as Li 4 Ti 5 O 12 (2.5 to 1.2 V vs. Li + /Li) and carbon (below 1.0 V vs. Li + /Li) in such C‐rich composites . Therefore, our TiO 2 @C nanocomposites were investigated in a large potential range (from 3 to 0 V) to take advantage of the reversible storage of lithium ions in both TiO 2 and carbon, which could improve the electrochemical performance, affording a higher capacity than TiO 2 or carbon investigated separately.…”