Ternary AlGexP alloy compounds for high capacity and rate capability of lithium-ion battery anodes

Wenwu Li*, Jiajun Wen, Anjie Chen, Jeng Han Wang, Meilin Liu, Ho Seok Park*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)25329-25336
Number of pages8
JournalJournal of Materials Chemistry A
Volume10
Issue number47
DOIs
Publication statusPublished - 2022 Nov 7

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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