A new flame-retardant polymer electrolyte with enhanced Li-ion conductivity for safe lithium-sulfur batteries

Li, Hongping; Kuai, Yixi; Yang, Jun; Hirano, Shin‐ichi; Nuli, Yanna; Wang, Jiulin

doi:10.1016/j.jechem.2021.06.036

Cited by 34 publications

(8 citation statements)

References 24 publications

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“…Figure S19, Supporting Information demonstrates that the PE before polymerization is fluid and becomes a solid-phase electrolyte after heating. [34] The XRD pattern of PEs (Figure 3d) determines that amorphous LOPPM favors ionic conduction. [35] TG thermal stability of the PEs in Figure 3e and Figure S20a,b, Supporting Information manifest that all samples degrade at 290-350 °C.…”

Section: Physical and Electrochemical Properties Of Pes With Multi-di...mentioning

confidence: 99%

In Situ Construction Channels of Lithium‐Ion Fast Transport and Uniform Deposition to Ensure Safe High‐Performance Solid Batteries

Zhao

Shan

et al. 2023

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Solid‐state lithium‐ion batteries (SLIBs) are the promising development direction for future power sources because of their high energy density and reliable safety. To optimize the ionic conductivity at room temperature (RT) and charge/discharge performance to obtain reusable polymer electrolytes (PEs), polyvinylidene fluoride (PVDF), and poly(vinylidene fluoride‐hexafluoro propylene) (P(VDF‐HFP)) copolymer combined with polymerized methyl methacrylate (MMA) monomers are used as substrates to prepare PE (LiTFSI/OMMT/PVDF/P(VDF‐HFP)/PMMA [LOPPM]). LOPPM has interconnected lithium‐ion 3D network channels. The organic‐modified montmorillonite (OMMT) is rich in the Lewis acid centers, which promoted lithium salt dissociation. LOPPM PE possessed high ionic conductivity of 1.1 × 10−3 S cm−1 and a lithium‐ion transference number of 0.54. The capacity retention of the battery remained 100% after 100 cycles at RT and 0.5 C. The initial capacity of one with the second‐recycled LOPPM PE is 123.9 mAh g−1. This work offered a feasible pathway for developing high‐performance and reusable LIBs.

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Section: Physical and Electrochemical Properties Of Pes With Multi-di...mentioning

confidence: 99%

In Situ Construction Channels of Lithium‐Ion Fast Transport and Uniform Deposition to Ensure Safe High‐Performance Solid Batteries

Zhao

Shan

et al. 2023

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“…Another method of preventing thermal runaway by thermal polymerization is to utilize the thermoresponsive electrolyte as a thermal switch at thermal runaway temperatures to inhibit ion conduction by thermal polymerization and thus avoid combustion and explosion. 38,137 Recently, Cui's group 138 prepared a novel polymer electrolyte called P(VC-EAVE)-PE by the copolymerization of vinylene carbonate (VC) and 2-ethylhexanoic acid vinyl ester (EAVE) in a PE separator. However, the conversion rate of the copolymerization between VC and EAVE was low, resulting in a high amount (50 mol%) of the VC monomer remaining in the polymer after copolymerization.…”

Section: Thermal Polymerizationmentioning

confidence: 99%

Thermally responsive polymers for overcoming thermal runaway in high-safety electrochemical storage devices

Chen

Liu

Feng

et al. 2023

Mater. Chem. Front.

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“…To reduce the risk of battery fires, researchers have examined safety additives, such as flame retardants and issues relating to overcharging of the batteries. − Batteries contain flame-retardant chemicals to maintain and protect the electrolytes. They inhibit electrolyte combustion and have a negligible impact on the electrochemical battery performance. − The generation and dissipation of heat in LIBs is a significant concern. − …”

Section: Introductionmentioning

confidence: 99%

Exploring the Effects of Dopamine and DMMP Additives on Improving the Cycle Boosting and Nonflammability of Electrolytes in Full-Cell Lithium-Ion Batteries (18650)

et al. 2023

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Concerns over recyclability, performance, and safety have grown as the use of commercial Li-ion batteries to meet our energy needs has increased. Electrolytes may aid in increased flammability, capacity loss, and safety. Dimethyl methyl phosphonate (DMMP), a flame retardant, and dopamine hydrochloride (DOP) are utilized to increase the cycle life and graphite anode compatibility. The optimal additive formulation (5% wt DMMP and 0.1% wt DOP) reduces inflammability and increases cycle life and reversible capacity (99.14%). Molecular dynamics simulations provide a comprehensive atomistic account of the dynamics of Li + ion solvation in the electrolytes and in the presence of additives. Dopamine and DMMP increase the Li-ion solvation-free energy in the electrolyte formulation. While increasing the Li-ion conductivity, additive addition reduces the electrolyte viscosity and enables the formation of a smaller, stronger Li-DMMP-DOP complex than the larger Li-carbonate complex found in Li-neat electrolyte systems. When DMMP and DOP are added to the electrolyte, the carbonates are displaced from the Li-carbonate complex by these additives. The Li-ion solvating nature or compatibility was improved upon the addition of DMMP/DOP further aided by a faster diffusive behavior of the Li complex, which in part would be instrumental in enhancing the performance and safety of the battery electrolyte additive formulations. The modified electrolyte (DMMP 5% wt, DOP 0.1% wt) has a conductivity of 18.60 mS cm −1 and a low viscosity at 25 °C. This formulation was evaluated using graphite/NMC-532 cylindrical cells with commercial electrodes. The performance of the graphite/NMC-532 cells containing the modified electrolyte was comparable to those of regular electrolytes based on carbonates: ethylene carbonate/ dimethyl carbonate/ethylmethylcarbonate (EC/DMC/EMC) (1:1:1) additions. These findings indicate that DOP and DMMP have a lower oxidation potential (4.3 V) than most commercial electrolytes (4.5 V), preventing cathode deterioration. These insights should pave the path for rational design of practical and cost-effective Li-ion battery electrolyte additive combinations aimed toward lower flammability and improved performance.

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A new flame-retardant polymer electrolyte with enhanced Li-ion conductivity for safe lithium-sulfur batteries

Cited by 34 publications

References 24 publications

In Situ Construction Channels of Lithium‐Ion Fast Transport and Uniform Deposition to Ensure Safe High‐Performance Solid Batteries

In Situ Construction Channels of Lithium‐Ion Fast Transport and Uniform Deposition to Ensure Safe High‐Performance Solid Batteries

Thermally responsive polymers for overcoming thermal runaway in high-safety electrochemical storage devices

Exploring the Effects of Dopamine and DMMP Additives on Improving the Cycle Boosting and Nonflammability of Electrolytes in Full-Cell Lithium-Ion Batteries (18650)

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