期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 13, 页码 15053-15062出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b21803
关键词
sodium-ion batteries; zinc phosphide; phosphorus-based anode; zinc-based anode; metal phosphide
资金
- National Research Foundation of Korea (NRF) - Korea Government (MSIP) [NRF-2018R1A2B6007112, NRF-2018R1A6A1A03025761]
To design a high-performance sodium-ion battery anode, binary zinc phosphides (ZnP2 and Zn3P2) were synthesized by a facile solid-state heat treatment process, and their Na storage characteristics were evaluated. The Na reactivity of ZnP2 was better than that of Zn3P2. Therefore, a C-modified ZnP2-based composite (ZnP2-C) was fabricated to achieve better electrochemical performance. To investigate the electrochemical reaction mechanism of ZnP2-C during sodiation/desodiation, various ex situ analytical techniques were employed. During sodiation, ZnP2 in the composite was transformed into NaZn13 and Na3P phases, exhibiting a one-step conversion reaction. Conversely, Zn and P in NaZn13 and Na3P, respectively, were fully recombined to the original ZnP2 phase during desodiation. Owing to the one-step conversion/recombination of ZnP2 in the composite during cycling, the ZnP2-C showed high electrochemical performance with a highly reversible capacity of 883 mA h g(-1 )after 130 cycles with no capacity deterioration and a fast C-rate capability of 500 mA h g(-1) at 1 C and 350 mA h g(-1) at 3 C.
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