Simple routes from natural graphite to graphite foams: Preparation, structure and properties

Han

et al. 2022

Small

The further demand for electric vehicles and smart grids prompts that the comprehensive function of lithium‐ion batteries (LIBs) has been improved greatly. However, due to sluggish Li+ diffusion rate, thermal runway and volume expansion, the commercial graphite as an important part of LIBs is not suitable for fast‐charging. Herein, nano‐sized Nb14W3O44 blocks are effectively synthesized as a fast‐charge anode material. The nano‐sized structure provides shorter Li+ diffusion pathway in the solid phase than micro‐sized materials by several orders of magnitude, corresponding to accelerating the Li+ diffusion rate, which is beneficial for fast‐charge characteristics. Consequently, Nb14W3O44 displays excellent long‐term cycling life (135 mAh g‐1 over 1000 cycles at 10 C) and rate capability at ultra‐high current density (≈103.9 mAh g‐1, 100 C) in half‐cells. In situ X‐ray diffraction and Raman combined with scanning electron microscopy clearly confirms the stability of crystal and microstructure. Furthermore, the fabricated Nb14W3O44||LiFePO4 full cells exhibit a remarkable power density and demonstrate a reversible specific capacity. The pouch cell delivers long cycling life (the capacity retention is as high as 96.6% at 10 C after 5000 cycles) and high‐safety performance. Therefore, nano‐sized Nb14W3O44 could be recognized as a promising fast‐charge anode toward next‐generation practical LIBs.

mentioning

confidence: 99%

Nano‐Sized Niobium Tungsten Oxide Anode for Advanced Fast‐Charge Lithium‐Ion Batteries

Guo

Han

et al. 2022

Small

“…KCl-removed GFs by water washing contained nearly uniform cubic micropores with mainly open-pore structures. The pore size of the GFs was approximately 100 μm, which can be related to the particle size of KCl . It can be seen that as the KCl template agent content increased, the GF supporting material became looser, while the size distribution of the microcells remained unchanged …”

Section: Resultsmentioning

confidence: 97%

“…The binder phenolic resin has no other impurity elements, and these elements have the same element composition as graphite powder (Figure S4b), and more importantly, the presence of Cl elements was not found in the EDS energy spectrum. Therefore, it can be considered that the cell walls were composed of graphite powder …”

Section: Resultsmentioning

confidence: 99%

“…It can be observed that the compressive strength of GFs gradually decreased with the increase of template agent content. This could be because the increase in the content of the template agent makes the graphite powder unable to completely cover the KCl particles, and when the template agent was removed, the thickness of the cell wall became thinner, resulting in a gradual decrease in strength . The hydrophobicity of GFs plays an important role in the infiltration of PW in pores.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Multienergy-Triggered Composite Phase-Change Materials Based on Graphite Foams Synthesized from Graphite Extracted from Spent Lithium-Ion Batteries

Zhang

ACS Sustainable Chem. Eng.

et al. 2022

Self Cite

Multifunctional composite phase-change materials (CPCMs) with dual photo/electrothermal triggers have great potential for sustainable energy utilization. Photo/electric-triggered CPCMs are usually prepared by compounding graphene or carbon nanotubes with phase-change materials (PCMs). However, the practical applications of such materials are limited by the complexity and cost of common preparation methods for the supporting materials. Herein, a template method is developed to prepare graphite foams (GFs) using easily available graphite powder extracted from spent lithium-ion batteries. Paraffin wax (PW) is subsequently incorporated into the GFs as a PCM to synthesize GF-PW CPCMs with superior photo/electrothermal conversion capacity. The prepared GF-PW CPCMs exhibit high latent enthalpy (173.9 to 209.2 J/g) and excellent shape and thermal stability and cycling ability. The inherent high thermal/electrical conductivity and excellent solar light absorption capacity of the GFs fabricated from graphite powder confer the GF-PW CPCMs with excellent photo/electrothermal conversion performance. In addition, the 1:4 GF-PW CPCMs exhibit the highest thermal conductivity of 1.38 W/(m K), which is up to 4.11 times higher than that of pure PW. This work not only opens up a pathway for the utilization of graphite powder extracted from spent lithium-ion batteries, but also provides a facile low-cost method for preparing CPCMs with potential applications in photo/electrothermal energy storage and conversion.

“…Furthermore, sucrose can act not only as a carbon precursor, 68,96,172 but also as a binder between the carbon particles. 173 Glucose, with five hydroxyl groups and one aldehyde group in its structure, is not only the most widely distributed monosaccharide in nature, but also the common unit in many carbohydrates. Because of its simple structure and single composition, glucose is easily carbonized as a carbon precursor.…”

Section: Liquefiable Biomassmentioning

confidence: 99%

Liquefiable biomass-derived porous carbons and their applications in CO₂capture and conversion

Jin

Gan

et al. 2022

Green Chem.