English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Influence of pore architecture and chemical structure on the sodium storage in nitrogen-doped hard carbons

Schutjajew, K., Pampel, J., Zhang, W., Antonietti, M., & Oschatz, M. (2021). Influence of pore architecture and chemical structure on the sodium storage in nitrogen-doped hard carbons. Small, 2006767. doi:10.1002/smll.202006767.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Schutjajew, Konstantin1, Author              
Pampel, Jonas1, Author              
Zhang, Wuyong1, Author              
Antonietti, Markus2, Author              
Oschatz, Martin1, Author              
Affiliations:
1Martin Oschatz, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2364733              
2Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

Content

show
hide
Free keywords: energy storage; hard carbons; Na-ion batteries; pore structures; anodes
 Abstract: Hard carbon is the material of choice for sodium ion battery anodes. Capacities comparable to those of lithium/graphite can be reached, but the understanding of the underlying sodium storage mechanisms remains fragmentary. A two-step process is commonly observed, where sodium first adsorbs to polar sites of the carbon (“sloping region”) and subsequently fills small voids in the material (“plateau region”). To study the impact of nitrogen functionalities and pore geometry on sodium storage, a systematic series of nitrogen-doped hard carbons is synthesized. The nitrogen content is found to contribute to sloping capacity by binding sodium ions at edges and defects, whereas higher plateau capacities are found for materials with less nitrogen content and more extensive graphene layers, suggesting the formation of 2D sodium structures stabilized by graphene-like pore walls. In fact, up to 84% of the plateau capacity is measured at potentials less than 0 V versus metallic Na, that is, quasimetallic sodium can be stabilized in such structure motifs. Finally, gas physisorption measurements are related to charge–discharge data to identify the energy storage relevant pore architectures. Interestingly, these are pores inaccessible to probe gases and electrolytes, suggesting a new view on such “closed pores” required for efficient sodium storage.

Details

show
hide
Language(s): eng - English
 Dates: 2021-02-22
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1002/smll.202006767
BibTex Citekey: https://doi.org/10.1002/smll.202006767
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Small
  Other : Small
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: - Sequence Number: 2006767 Start / End Page: - Identifier: ISSN: 1613-6810