Production of high-energy 6-Ah-level Li | |LiNi0.83Co0.11Mn0.06O2 multi-layer pouch cells via negative electrode protective layer coating strategy

Yangyang Feng, Yong Li (), Jing Lin, Huyue Wu, Lei Zhu, Xiang Zhang, Linlin Zhang, Chuan-Fu Sun, Maoxiang Wu and Yaobing Wang ()
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Yangyang Feng: Chinese Academy of Sciences
Yong Li: Shanghai Institute of Space Power-Sources
Jing Lin: Chinese Academy of Sciences
Huyue Wu: Chinese Academy of Sciences
Lei Zhu: Chinese Academy of Sciences
Xiang Zhang: Chinese Academy of Sciences
Linlin Zhang: Chinese Academy of Sciences
Chuan-Fu Sun: Chinese Academy of Sciences
Maoxiang Wu: Chinese Academy of Sciences
Yaobing Wang: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Stable lithium metal negative electrodes are desirable to produce high-energy batteries. However, when practical testing conditions are applied, lithium metal is unstable during battery cycling. Here, we propose poly(2-hydroxyethyl acrylate-co-sodium benzenesulfonate) (PHS) as negative electrode protective layer. The PHS contains soft poly (2-hydroxyethyl acrylate) and poly(sodium p-styrene sulfonate), which improve electrode flexibility, connection with the Cu current collector and transport of Li ions. Transmission electron cryomicroscopy measurements reveal that PHS induces the formation of a solid electrolyte interphase with a fluorinated rigid and crystalline internal structure. Furthermore, theoretical calculations suggest that the -SO3- group of poly(sodium p-styrene sulfonate) promotes Li-ion motion towards interchain migration through cation-dipole interaction, thus, enabling uniform Li-ion diffusion. Electrochemical measurements of Li | |PHS-coated-Cu coin cells demonstrate an average Coulombic efficiency of 99.46% at 1 mA/cm2, 6 mAh/cm2 and 25 °C. Moreover, when the PHS-coated Li metal negative electrode is paired with a high-areal-capacity LiNi0.83Co0.11Mn0.06O2-based positive electrode in multi-layer pouch cell configuration, the battery delivers an initial capacity of 6.86 Ah (corresponding to a specific energy of 489.7 Wh/kg) and, a 91.1% discharge capacity retention after 150 cycles at 2.5 mA/cm2, 25 °C and 172 kPa.

Date: 2023
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DOI: 10.1038/s41467-023-39391-8

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