PI-LAGP Separator─Construction, Battery Application Performance, and Chemical Valence Changes of Germanium

Liu, Jian‐Ni; Cao, Jin; Liang, Wenjing; Yang, Lu-Ye; Wu, Dayong

doi:10.1021/acsapm.2c00467

Cited by 4 publications

(1 citation statement)

References 52 publications

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“…Note that a recent experimental study showed that the commercial cellulose-based separators show similar swelling and weakening behavior as polyolefins; we expect our model could also apply to those materials. Furthermore, much work in recent years has been focused on developing new battery separator materials, − while only a few of them assess the new materials for swelling and softening in the presence of electrolyte solvents. Our model can help make such an assessment with minimal experimental effort.…”

Section: Discussionmentioning

confidence: 99%

Prediction of Swelling of Polypropylene Separators and Its Effect on the Lithium-Ion Battery Performance

Maksimov

Molina

Максимова

et al. 2023

ACS Appl. Polym. Mater.

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The safety and reliability of lithium-ion batteries depend on porous separators, many of which are made of polymer materials, such as polypropylene. Favorable interactions between a separator and organic electrolyte solvents used in the batteries often induce separator swelling. Swelling increases the electric resistance of the cell and is accompanied by plasticization of the separator, which also affects the battery's performance. Here we propose a model based on Flory's theory of polymer solutions which can predict the swelling of a porous polymer separator based on the Flory−Huggins parameter for polymer−solvent interactions. Despite the complexity of the polymer structure, introducing only two additional parameters provides predictive capability for the model. These two parameters can be obtained based on experimental measurements of separator swelling in two different solvents; the model also requires the Flory−Huggins parameter as an input, which can be calculated based on the UNIFAC-FV group contribution method for a given polymer−solvent pair. We illustrated the applicability of this model to recent experimental data on the swelling of polypropylene separators in various solvents. We also showed a simple relation between the separator swelling and an increase in cell resistance. Our model can be used for a quick assessment of various polymer−solvent pairs for application in lithium-ion batteries.

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Section: Discussionmentioning

confidence: 99%

Prediction of Swelling of Polypropylene Separators and Its Effect on the Lithium-Ion Battery Performance

Maksimov

Molina

Максимова

et al. 2023

ACS Appl. Polym. Mater.

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Synergistic Dual Electrolyte System of LATP and In‐ Situ Solod‐State PDOL System and its Improvement on the Performance of NCM811 Batteries

Cao,

Zhang,

Wang

et al. 2024

Batteries & Supercaps

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Abstract1,3‐Dioxolane (DOL) can undergo in‐situ polymerization in batteries to form solid‐state organic electrolyte PDOL. When applied to NCM811||Li battery system, PDOL electrolyte helps optimize the contact and interface stability between electrolyte and electrodes. This study explores the effects of PDOL with PE separators coated with Li1.3Al0.3Ti1.7(PO4)3(LATP) on the performance of NCM811||Li batteries. 2,2,2‐trifluoroethyl phosphite (DETFPi), was mixed with DOL at a 1 : 35 mass ratio. Then, LiBF4 was used to initiate in‐situ polymerization and thereby obtained DETFPi‐PDOL electrolyte after 24 h at room temperature. The composite electrolyte exhibits enhanced ion conductivity (1.59×10−4 S cm−1), high lithium ion transference number (0.78), wide electrochemical stability window (4.53 V), and high critical current density (2.2 mA cm−2). Li||PDOL@LATP||Li battery shows extremely low overpotential (35 mV) after a constant current stable cycle of 500 h at 1.0 mA cm−2. After 500 cycles at 1 C, the remaining capacity is 153.9 mAh g−1 with a capacity retention of 82.1 % in NCM811||PDOL@LATP||Li batteries. This indicates that the LATP coating on the surface of the PE separator plays an important role in optimizing the performance of DETFPI‐PDOL electrolyte batteries. LATP and DETFPI‐PDOL are effective in improving the cycling stability, rate performance, and interface state of NCM811 batteries.

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Engineering lithiophilic LiCx layer to robust interfacial chemistry between LAGP and Li anode for Li-metal batteries

Li,

Yan,

Jia

et al. 2024

Chinese Chemical Letters

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PI-LAGP Separator─Construction, Battery Application Performance, and Chemical Valence Changes of Germanium

Cited by 4 publications

References 52 publications

Prediction of Swelling of Polypropylene Separators and Its Effect on the Lithium-Ion Battery Performance

Prediction of Swelling of Polypropylene Separators and Its Effect on the Lithium-Ion Battery Performance

Synergistic Dual Electrolyte System of LATP and In‐ Situ Solod‐State PDOL System and its Improvement on the Performance of NCM811 Batteries

Engineering lithiophilic LiCx layer to robust interfacial chemistry between LAGP and Li anode for Li-metal batteries

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