In:
Energy & Environmental Science, Royal Society of Chemistry (RSC), Vol. 16, No. 5 ( 2023), p. 2153-2166
Abstract:
Carbonaceous anodes hold great promise for potassium-ion batteries (PIBs), however, their electrochemical performance is still unsatisfactory to meet practical requirements due to low capacities and sluggish insertion of large K + ions. Herein, we showcase a previously unexplored design of high-load atomic antimony coordinated with four nitrogen and two oxygen atoms ( i.e. , O 2 Sb 1 N 4 ) in nitrogen-doped micropore carbon nanosheets (O–Sb–N SA@NC) for the PIB anode with markedly enhanced performance. Substantial in situ and ex situ experimental results along with theoretical computation explicitly reveal that the unique coordination environment of O 2 Sb 1 N 4 sites brings fascinating features for K + storage including abundant K + ion storage sites, reduced K + diffusion barrier, enhanced capability for K + ion adsorption/desorption, while O–Sb–N SA@NC effectively alleviates volume variation and agglomeration. Accordingly, the resultant anode has demonstrated large reversible capacities (593.3 mA h g −1 , 100 cycles at 0.1 A g −1 ), high-rate capability, and extraordinary durability, outperforming most of the reported carbonaceous anodes. Notably, the assembled full cell exhibits exceptional rate capability and ultra-long lifespan (1200 cycles, 81% capacity retention at 5 A g −1 ). Our work paves the way for constructing novel single atom materials on carbon with unique coordination structures for high-performance energy storage devices.
Type of Medium:
Online Resource
ISSN:
1754-5692
,
1754-5706
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2439879-2
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