In:
Chemical Science, Royal Society of Chemistry (RSC), Vol. 15, No. 14 ( 2024), p. 5192-5200
Abstract:
Layered transition metal oxides (Na x TMO 2 ) possess attractive features such as large specific capacity, high ionic conductivity, and a scalable synthesis process, making them a promising cathode candidate for sodium-ion batteries (SIBs). However, Na x TMO 2 suffer from multiple phase transitions and Na + /vacancy ordering upon Na + insertion/extraction, which is detrimental to their electrochemical performance. Herein, we developed a novel cathode material that exhibits an abnormal P2-type structure at a stoichiometric content of Na up to 1. The cathode material delivers a reversible capacity of 108 mA h g −1 at 0.2C and 97 mA h g −1 at 2C, retaining a capacity retention of 76.15% after 200 cycles within 2.0–4.3 V. In situ diffraction studies demonstrated that this material exhibits an absolute solid-solution reaction with a low volume change of 0.8% during cycling. This near-zero-strain characteristic enables a highly stabilized crystal structure for Na + storage, contributing to a significant improvement in battery performance. Overall, this work presents a simple yet effective approach to realizing high Na content in P2-type layered oxides, offering new opportunities for high-performance SIB cathode materials.
Type of Medium:
Online Resource
ISSN:
2041-6520
,
2041-6539
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2024
detail.hit.zdb_id:
2639733-X
detail.hit.zdb_id:
2559110-1
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