In:
Advanced Energy Materials, Wiley, Vol. 13, No. 27 ( 2023-07)
Abstract:
Na‐ion batteries (NIBs) are promising for grid‐scale energy storage applications. However, the lack of Co, Ni‐free cathode materials has made them less cost‐effective. In this work, Mg 2+ is successfully utilized to activate the oxygen redox reaction in earth‐abundant Fe/Mn‐based layered cathodes to achieve reversible hybrid anionic and cationic redox capacities. A high first charge capacity of ≈210 mAh g −1 with balanced charge–discharge efficiency is achieved without O‐loss, showing a promising energy cost of $2.02 kWh −1 . Full cell against hard carbon anode without pre‐sodiation shows energy density exceeding ≈280 Wh kg −1 with a decent capacity retention of 85.6% after 100 cycles. A comprehensive analysis of the charge compensation mechanisms and structural evolution is conducted. Voltage and capacity loss resulting from partially reversible Fe 3+ migration to the Na layer is confirmed, shedding light on further improvements for low‐cost NIB cathodes in application scenarios.
Type of Medium:
Online Resource
ISSN:
1614-6832
,
1614-6840
DOI:
10.1002/aenm.202300746
Language:
English
Publisher:
Wiley
Publication Date:
2023
detail.hit.zdb_id:
2594556-7
