A TiSe2-Graphite Dual Ion Battery: Fast Na-Ion Insertion and Excellent Stability

Runtian Zheng, Haoxiang Yu, Xikun Zhang, Yang Ding, Maoting Xia, Kangzhe Cao, Jie Shu, Alexandru Vlad, Bao Lian Su

Research output: Contribution to journalArticlepeer-review

Abstract

The sodium dual ion battery (Na-DIB) technology is proposed as highly promising alternative over lithium-ion batteries for the stationary electrochemical energy-storage devices. However, the sluggish reaction kinetics of anode materials seriously impedes their practical implementation. Herein, a Na-DIB based on TiSe2-graphite is reported. The high diffusion coefficient of Na-ions (3.21×10−11–1.20×10−9 cm2 s−1) and the very low Na-ion diffusion barrier (0.50 eV) lead to very fast electrode kinetics, alike in conventional surface capacitive storage systems. In-situ investigations reveal that the fast Na-ion diffusion involves four insertion stage compositions. A prototype cell shows a reversible capacity of 81.8 mAh g−1 at current density of 100 mA g−1, excellent stability with 83.52 % capacity retention over 200 cycles and excellent rate performance, suggesting its potential for next-generation large scale high-performance stationary energy storage systems.

Original languageEnglish
Pages (from-to)18430-18437
Number of pages8
JournalAngewandte Chemie - International Edition
Volume60
Issue number34
DOIs
Publication statusPublished - 16 Aug 2021

Keywords

  • dual-ion batteries
  • graphite cathodes
  • reaction mechanisms
  • sodium
  • TiSe

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