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Tailoring polymer electrolyte ionic conductivity for production of low- temperature operating quasi-all-solid-state lithium metal batteries
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Tailoring polymer electrolyte ionic conductivity for production of low- temperature operating quasi-all-solid-state lithium metal batteries
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Journal Article
Tailoring polymer electrolyte ionic conductivity for production of low- temperature operating quasi-all-solid-state lithium metal batteries
2023
Overview
The stable operation of lithium-based batteries at low temperatures is critical for applications in cold climates. However, low-temperature operations are plagued by insufficient dynamics in the bulk of the electrolyte and at electrode|electrolyte interfaces. Here, we report a quasi-solid-state polymer electrolyte with an ionic conductivity of 2.2 × 10
−4
S cm
−1
at −20 °C. The electrolyte is prepared via in situ polymerization using a 1,3,5-trioxane-based precursor. The polymer-based electrolyte enables a dual-layered solid electrolyte interphase formation on the Li metal electrode and stabilizes the LiNi
0.8
Co
0.1
Mn
0.1
O
2
-based positive electrode, thus improving interfacial charge-transfer at low temperatures. Consequently, the growth of dendrites at the lithium metal electrode is hindered, thus enabling stable Li||LiNi
0.8
Co
0.1
Mn
0.1
O
2
coin and pouch cell operation even at −30 °C. In particular, we report a Li||LiNi
0.8
Co
0.1
Mn
0.1
O
2
coin cell cycled at −20 °C and 20 mA g
−1
capable of retaining more than 75% (i.e., around 151 mAh g
−1
) of its first discharge capacity cycle at 30 °C and same specific current.
Low-temperature batteries are detrimentally affected by the sluggish kinetics of the electrolyte. Here, the authors propose a quasi-solid-state polymer electrolyte capable of improving interfacial charge transfer and enabling stable Li metal cell operation even at −30 °C.
