TY - JOUR
T1 - Ternary AlGexP alloy compounds for high capacity and rate capability of lithium-ion battery anodes
AU - Li, Wenwu
AU - Wen, Jiajun
AU - Chen, Anjie
AU - Wang, Jeng Han
AU - Liu, Meilin
AU - Park, Ho Seok
N1 - Publisher Copyright:
© 2022 The Royal Society of Chemistry.
PY - 2022/11/7
Y1 - 2022/11/7
N2 - Despite the high volumetric capacity of Ge-based anodes, their practical applications are still limited by low cycling stability and rate performance. To resolve these challenges, herein, we simultaneously incorporate both Al and P into Ge to synthesize AlGexP (x = 6, 2, 2/3) series materials through a facile mechanical ball milling method. Experiments and theoretical calculations confirm that AlGe2P provides the fastest electronic conductivity and Li-ion diffusion capability, thus providing the best Li-storage performance among AlGexP (x = 6, 2, 2/3) series materials. As verified by ex situ characterization, AlGe2P features a reversible Li-storage mechanism arising from the first intercalation stage followed by conversion reactions, where the electronically conducting Li15GeP3, Li4.4Ge, and LiAl and Li-ion conducting Li3P, Li4.4Ge and LiAl are simultaneously produced, ensuring fast charge storage kinetics upon cycling. Accordingly, the AlGe2P/C composite presents a long-term cycling stability of retaining 867 mA h g−1 after 800 cycles at 2000 mA g−1, and a high-rate capacity of 454 mA h g−1 even at 20 000 mA g−1, thus holding promise for real world applications. Broadly, the ternary all-lithium-reactive Ge-based compounds have great application potential in the energy storage field due to their intriguing physiochemical properties.
AB - Despite the high volumetric capacity of Ge-based anodes, their practical applications are still limited by low cycling stability and rate performance. To resolve these challenges, herein, we simultaneously incorporate both Al and P into Ge to synthesize AlGexP (x = 6, 2, 2/3) series materials through a facile mechanical ball milling method. Experiments and theoretical calculations confirm that AlGe2P provides the fastest electronic conductivity and Li-ion diffusion capability, thus providing the best Li-storage performance among AlGexP (x = 6, 2, 2/3) series materials. As verified by ex situ characterization, AlGe2P features a reversible Li-storage mechanism arising from the first intercalation stage followed by conversion reactions, where the electronically conducting Li15GeP3, Li4.4Ge, and LiAl and Li-ion conducting Li3P, Li4.4Ge and LiAl are simultaneously produced, ensuring fast charge storage kinetics upon cycling. Accordingly, the AlGe2P/C composite presents a long-term cycling stability of retaining 867 mA h g−1 after 800 cycles at 2000 mA g−1, and a high-rate capacity of 454 mA h g−1 even at 20 000 mA g−1, thus holding promise for real world applications. Broadly, the ternary all-lithium-reactive Ge-based compounds have great application potential in the energy storage field due to their intriguing physiochemical properties.
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U2 - 10.1039/d2ta06370k
DO - 10.1039/d2ta06370k
M3 - Article
AN - SCOPUS:85143347292
SN - 2050-7488
VL - 10
SP - 25329
EP - 25336
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 47
ER -