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Synthesis of vanadium nitride-hard carbon composites from cellulose and their performance for sodium ion batteries

Synthesis of vanadium nitride-hard carbon composites from cellulose and their performance for sodium ion batteries
Synthesis of vanadium nitride-hard carbon composites from cellulose and their performance for sodium ion batteries
A promising material for sodium-ion battery anodes has been developed through the controlled formation of a thin, uniformly dispersed layer of vanadium nitride (VN) nanoparticles onto a high-performance hard carbon. Hard carbon is the standard (pre)commercial material for sodium-ion negative electrodes, and our hard carbon electrodes exhibit an electrochemical performance comparable to the state-of-the-art. The introduction of VN produces an increased capacity: with addition of 8.6 wt% VN, the hard carbon-based electrode achieves a first cycle reversible (oxidation, de-sodiation) capacity of 354 mA h g-1 at 50 mA g-1, while with pure hard carbon it is 302 mA h g 1. The additional specific capacity achieved upon addition of VN, compared with the pure hard carbon, is 605 mA h g-1 when referred to the mass of VN only, which is the highest capacity of VN materials in sodium-ion batteries reported to date. In addition, VN also improves the capacity retention with cycling: after 50 cycles the reversible capacity of hard carbon electrodes with 8.6 wt% VN is 294 mA h g-1, while with pure hard carbon it is 239 mA h g-1. This promising new material is obtained via a new and easily scalable synthesis method in which cotton wool is reacted with a vanadium source (VOCl3), followed by a single firing step in N2. Insights into the reaction mechanism are obtained by ex situ characterization of the discharged and charged electrodes.
2574-0962
Cheng, Hang
f3a86c10-c405-46da-b37d-28a37aa355aa
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Cheng, Hang
f3a86c10-c405-46da-b37d-28a37aa355aa
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5

Cheng, Hang, Garcia-Araez, Nuria and Hector, Andrew L. (2020) Synthesis of vanadium nitride-hard carbon composites from cellulose and their performance for sodium ion batteries. ACS Applied Energy Materials. (doi:10.1021/acsaem.0c00003).

Record type: Article

Abstract

A promising material for sodium-ion battery anodes has been developed through the controlled formation of a thin, uniformly dispersed layer of vanadium nitride (VN) nanoparticles onto a high-performance hard carbon. Hard carbon is the standard (pre)commercial material for sodium-ion negative electrodes, and our hard carbon electrodes exhibit an electrochemical performance comparable to the state-of-the-art. The introduction of VN produces an increased capacity: with addition of 8.6 wt% VN, the hard carbon-based electrode achieves a first cycle reversible (oxidation, de-sodiation) capacity of 354 mA h g-1 at 50 mA g-1, while with pure hard carbon it is 302 mA h g 1. The additional specific capacity achieved upon addition of VN, compared with the pure hard carbon, is 605 mA h g-1 when referred to the mass of VN only, which is the highest capacity of VN materials in sodium-ion batteries reported to date. In addition, VN also improves the capacity retention with cycling: after 50 cycles the reversible capacity of hard carbon electrodes with 8.6 wt% VN is 294 mA h g-1, while with pure hard carbon it is 239 mA h g-1. This promising new material is obtained via a new and easily scalable synthesis method in which cotton wool is reacted with a vanadium source (VOCl3), followed by a single firing step in N2. Insights into the reaction mechanism are obtained by ex situ characterization of the discharged and charged electrodes.

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Accepted/In Press date: 8 April 2020
e-pub ahead of print date: 8 April 2020

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Local EPrints ID: 439429
URI: http://eprints.soton.ac.uk/id/eprint/439429
ISSN: 2574-0962
PURE UUID: f84f846b-7354-48c4-add6-ae9fd7c9d780
ORCID for Nuria Garcia-Araez: ORCID iD orcid.org/0000-0001-9095-2379
ORCID for Andrew L. Hector: ORCID iD orcid.org/0000-0002-9964-2163

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Date deposited: 22 Apr 2020 16:32
Last modified: 08 Apr 2021 04:01

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Author: Hang Cheng

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