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Zinc Phosphides as Outstanding Sodium-Ion Battery Anodes.

Authors :
Nam KH
Hwa Y
Park CM
Source :
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2020 Apr 01; Vol. 12 (13), pp. 15053-15062. Date of Electronic Publication: 2020 Mar 23.
Publication Year :
2020

Abstract

To design a high-performance sodium-ion battery anode, binary zinc phosphides (ZnP <subscript>2</subscript> and Zn <subscript>3</subscript> P <subscript>2</subscript> ) were synthesized by a facile solid-state heat treatment process, and their Na storage characteristics were evaluated. The Na reactivity of ZnP <subscript>2</subscript> was better than that of Zn <subscript>3</subscript> P <subscript>2</subscript> . Therefore, a C-modified ZnP <subscript>2</subscript> -based composite (ZnP <subscript>2</subscript> -C) was fabricated to achieve better electrochemical performance. To investigate the electrochemical reaction mechanism of ZnP <subscript>2</subscript> -C during sodiation/desodiation, various ex situ analytical techniques were employed. During sodiation, ZnP <subscript>2</subscript> in the composite was transformed into NaZn <subscript>13</subscript> and Na <subscript>3</subscript> P phases, exhibiting a one-step conversion reaction. Conversely, Zn and P in NaZn <subscript>13</subscript> and Na <subscript>3</subscript> P, respectively, were fully recombined to the original ZnP <subscript>2</subscript> phase during desodiation. Owing to the one-step conversion/recombination of ZnP <subscript>2</subscript> in the composite during cycling, the ZnP <subscript>2</subscript> -C showed high electrochemical performance with a highly reversible capacity of 883 mA h g <superscript>-1</superscript> after 130 cycles with no capacity deterioration and a fast C-rate capability of 500 mA h g <superscript>-1</superscript> at 1 C and 350 mA h g <superscript>-1</superscript> at 3 C.

Details

Language :
English
ISSN :
1944-8252
Volume :
12
Issue :
13
Database :
MEDLINE
Journal :
ACS applied materials & interfaces
Publication Type :
Academic Journal
Accession number :
32159333
Full Text :
https://doi.org/10.1021/acsami.9b21803