Hydroborate Solid-State Lithium Battery with High-Voltage NMC811 Cathode
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Date
2024-02-09
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Journal Article
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Abstract
Hydroborate solid electrolytes offer high ionic conductivity and are stable in contact with alkali metal anodes but are challenging to integrate into batteries with high-voltage cathodes. Here, we demonstrate stable dis-/charge cycling of solid-state Li batteries combining a Li₃(CB₁₁H₁₂)₂(CB₉H₁₀) hydroborate electrolyte with a 4 V-class LiNi₀.₈Mn₀.₁Co₀.₁O₂ (NMC811) cathode, exploiting the enhanced kinetic stability of the LiCB₁₁H₁₂-rich and LiCB₉H₁₀-poor electrolyte composition. Cells with Li metal and InLi anodes achieve a discharge capacity at C/10 of ∼145 mAh g⁻¹ at room temperature and ∼175 mAh g⁻¹ at 60 °C. InLi cells retain 98% of their initial discharge capacity after 100 cycles at C/5 and 70% after 1000 cycles at C/2. Capacity retentions of 97% after 100 cycles at C/5 and 75% after 350 cycles at C/2 are also achieved with a graphite anode without any excess Li. The energy density per cathode composite weight of 460 Wh kg⁻¹ is on par with the best solid-state batteries reported to date.
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Journal / series
Volume
9 (2)
Pages / Article No.
707 - 714
Publisher
American Chemical Society
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Subject
Carbon; Electrochemical cells; Electrodes; Solid electrolytes; Stability