On the Electrochemical Performance and Capacity Losses Seen for LiFePO4 Electrodes in Carbonate Electrolytes at Potentials up to 5.0 V versus Li+/Li
Lithium iron phosphate (LFP) is widely considered as a low‐potential positive electrode material. Herein, the high‐voltage stability and capacity retention of LFP composite electrodes are investigated at potentials up to 5.0 V (versus Li+/Li) using Li‐metal containing half‐cells and an electrolyte c...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley-VCH
2025-05-01
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| Series: | Advanced Energy & Sustainability Research |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/aesr.202400347 |
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| Summary: | Lithium iron phosphate (LFP) is widely considered as a low‐potential positive electrode material. Herein, the high‐voltage stability and capacity retention of LFP composite electrodes are investigated at potentials up to 5.0 V (versus Li+/Li) using Li‐metal containing half‐cells and an electrolyte composed of 1.0 M LiPF6 dissolved in 1:1 ethylene carbonate (EC)/diethyl carbonate (DEC). The results indicate that LFP electrodes are stable at such high potentials and that cycling up to 5.0 V (versus Li+/Li) at a rate of 1 C yields a 15% higher capacity compared to cycling up to 4.0 V (versus Li+/Li). The results further indicate that the lithiation of delithiated LFP electrode is incomplete. This yields a diffusion‐controlled capacity loss as some Li+ ions (and associated electrons) diffuse too far into the electrode to be accessible on the timescale of the subsequent delithiation. Analogue diffusion‐controlled capacity losses are also demonstrated for LFP–graphite full‐cells cycled up to 4.0 and 5.0 V. These insights, pave the way for new approaches to minimize capacity losses for lithium‐ion batteries. The demonstrated high‐voltage stability of LFP, also indicates that LFP can be used as a protective coating on high‐voltage transition metal oxide positive electrodes. |
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| ISSN: | 2699-9412 |