Journal of Inorganic Materials ›› 2025, Vol. 40 ›› Issue (3): 329-336.DOI: 10.15541/jim20240360

• RESEARCH LETTER • Previous Articles    

GeP3/Ketjen Black Composite: Preparation via Ball Milling and Performance as Anode Material for Sodium-ion Batteries

YANG Shuqi(), YANG Cunguo, NIU Huizhu, SHI Weiyi, SHU Kewei()   

  1. School of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
  • Received:2024-08-04 Revised:2024-10-15 Published:2025-03-20 Online:2025-03-12
  • Contact: SHU Kewei, associate professor. E-mail: shukw@sust.edu.cn
  • About author:YANG Shuqi (1999-), female, Master candidate. E-mail: 220811026@sust.edu.cn
  • Supported by:
    National Natural Science Foundation of China Young Scientist Fund(22105120);Shaanxi Province Qin Chuangyuan “Scientist+Engineer” Team Construction Project(2024QCY-KXJ-127)

Abstract:

Metal phosphides have been studied as prospective anode materials for sodium-ion batteries (SIBs) due to their higher specific capacity compared to other anode materials. However, rapid capacity decay and limited cycle life caused by volume expansion and low electrical conductivity of phosphides in SIBs remain still unsolved. To address these issues, GeP3 was first prepared by high-energy ball milling, and then Ketjen black (KB) was introduced to synthesize composite GeP3/KB anode materials under controlled milling speed and time by a secondary ball milling process. During the ball milling process, GeP3 and KB form strong chemical bonds, resulting in a closely bonded composite. Consequently, the GeP3/KB anodes was demonstrated excellent sodium storage performance, achieving a high reversible capacity of 933.41 mAh·g-1 at a current density of 0.05 A·g-1 for a special formula of GeP3/KB-600-40 sample prepared at ball milling speed of 600 r/min for 40 h. Even at a high current density of 2 A·g-1 over 200 cycles, the capacity remains 314.52 mAh·g-1 with a retention rate of 66.6%. In conclusion, this work successfully prepares GeP3/KB anode-carbon composite for electrodes by high-energy ball milling, which can restrict electrode volume expansion, enhance capacity, and improve cycle stability of SIBs.

Key words: sodium-ion battery, GeP3/C composite, Ketjen black, ball milling

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