Dataset Information

Solvent-Free Solid-State Lithium Battery Based on LiFePO₄ and MWCNT/PEO/PVDF-HFP for High-Temperature Applications.

ABSTRACT: Rechargeable lithium-ion batteries (LIBs) have a wide range of applications but face challenges in harsh working or operating environments at high temperatures. In this work, a solid polymer electrolyte with MWCNT-COOH as an additive (MWCNT-SPE) was obtained. MWCNT-SPE has a high thermal stability and can be used in high-temperature operating environments. Solid-state lithium batteries based on MWCNT-SPE and LiFePO₄ were assembled. The resulting lithium batteries exhibited excellent electrochemical properties at 70 and 120 °C, demonstrating a wide range of operations suitable for solid-state batteries with extreme demands. The symmetrical Li/MWCNT-SPE/Li cell operated for 1800 h with low polarization voltage and no short circuit, and the LiFePO₄/MWCNT-SPE/Li cell delivered superior cycling performance under both 0.2 and 0.5 C-rates, indicating that the interface compatibility between the lithium metal and MWCNT-SPE membrane was good and could effectively suppress the formation of lithium dendrites. The superior performance of the resulting MWCNT-SPE was due to the weak interaction between PEO, PVDF-HFP, and MWCNT-COOH, which reduced the tendency of PEO's crystallinity and thereby significantly increased the Li⁺ migration ability and improved the cycling life of the batteries.

SUBMITTER: Yu H

PROVIDER: S-EPMC8567355 | biostudies-literature | 2021 Nov

REPOSITORIES: biostudies-literature

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Publications

Solvent-Free Solid-State Lithium Battery Based on LiFePO<sub>4</sub> and MWCNT/PEO/PVDF-HFP for High-Temperature Applications.

Yu Han H Jin Ye Y Zhan Guodong David GD Liang Xinhua X

ACS omega 20211019 43

Rechargeable lithium-ion batteries (LIBs) have a wide range of applications but face challenges in harsh working or operating environments at high temperatures. In this work, a solid polymer electrolyte with MWCNT-COOH as an additive (MWCNT-SPE) was obtained. MWCNT-SPE has a high thermal stability and can be used in high-temperature operating environments. Solid-state lithium batteries based on MWCNT-SPE and LiFePO<sub>4</sub> were assembled. The resulting lithium batteries exhibited excellent e ...[more]

PMID: 34746595

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Project description:All solid-state rechargeable lithium metal batteries (SS-LMBs) are gaining more and more importance because of their higher safety and higher energy densities in comparison to their liquid-based counterparts. In spite of this potential, their low discharge capacities and poor rate performances limit them to be used as state-of-the-art SS-LMBs. This arise due to the low intrinsic ionic and electronic transport pathways within the solid components in the cathode during the fast charge/discharge processes. Therefore, it is necessary to have a cathode with good electron conducting channels to increase the active material utilization without blocking the movement of lithium ions. Since SS-LMBs require a different morphology and composition of the cathode, we selected LiFePO4 (LFP) as a prototype and, we have systematically studied the influence of the cathode composition by varying the contents of active material LFP, conductive additives (super C65 conductive carbon black and conductive graphite), ion conducting components (PEO and LiTFSI) in order to elucidate the best ion as well as electron conduction morphology in the cathode. In addition, a comparative study on different cathode slurry preparation methods was made, wherein ball milling was found to reduce the particle size and increase the homogeneity of LFP which further aids fast Li ion transport throughout the electrode. The SEM analysis of the resulting calendered electrode shows the formation of non-porous and crack-free structures with the presence of conductive graphite throughout the electrode. As a result, the optimum LFP cathode composition with solid polymer nanocomposite electrolyte (SPNE) delivered higher initial discharge capacities of 114 mAh g-1 at 0.2C rate at 30 °C and 141 mAh g-1 at 1C rate at 70 °C. When the current rate was increased to 2C, the electrode still delivered high discharge capacity of 82 mAh g-1 even after 500 cycle, which indicates that the optimum cathode formulation is one of the important parameters in building high rate and long cycle performing SS-LMBs.

Dataset Information

Solvent-Free Solid-State Lithium Battery Based on LiFePO₄ and MWCNT/PEO/PVDF-HFP for High-Temperature Applications.

Publications

Solvent-Free Solid-State Lithium Battery Based on LiFePO<sub>4</sub> and MWCNT/PEO/PVDF-HFP for High-Temperature Applications.

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Dataset Information

Solvent-Free Solid-State Lithium Battery Based on LiFePO4 and MWCNT/PEO/PVDF-HFP for High-Temperature Applications.

Publications

Solvent-Free Solid-State Lithium Battery Based on LiFePO<sub>4</sub> and MWCNT/PEO/PVDF-HFP for High-Temperature Applications.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Solvent-Free Solid-State Lithium Battery Based on LiFePO₄ and MWCNT/PEO/PVDF-HFP for High-Temperature Applications.