Nanocomposite Ionogel Electrolytes for Solid‐State Rechargeable Batteries

Hyun, Woo Jin; Thomas, Cory M.; Hersam, Mark C.

doi:10.1002/aenm.202002135

Cited by 48 publications

(45 citation statements)

References 51 publications

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“…Overall, while demonstrated here for solid‐state lithium‐ion batteries, this layered heterostructure ionogel electrolyte approach can likely be generalized to other emerging solid‐state battery technologies. [ 32 ]…”

Section: Resultsmentioning

confidence: 99%

Layered Heterostructure Ionogel Electrolytes for High‐Performance Solid‐State Lithium‐Ion Batteries

et al. 2021

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Ionogel electrolytes based on ionic liquids and gelling matrices offer several advantages for solid‐state lithium‐ion batteries, including nonflammability, wide processing compatibility, and favorable electrochemical and thermal properties. However, the absence of ionic liquids that are concurrently stable at low and high potentials constrains the electrochemical windows of ionogel electrolytes and thus their high‐energy‐density applications. Here, ionogel electrolytes with a layered heterostructure are introduced, combining high‐potential (anodic stability: >5 V vs Li/Li+) and low‐potential (cathodic stability: <0 V vs Li/Li+) imidazolium ionic liquids in a hexagonal boron nitride nanoplatelet matrix. These layered heterostructure ionogel electrolytes lead to extended electrochemical windows, while preserving high ionic conductivity (>1 mS cm−1 at room temperature). Using the layered heterostructure ionogel electrolytes, full‐cell solid‐state lithium‐ion batteries with a nickel manganese cobalt oxide cathode and a graphite anode are demonstrated, exhibiting voltages that are unachievable with either the high‐potential or low‐potential ionic liquid alone. Compared to ionogel electrolytes based on mixed ionic liquids, the layered heterostructure ionogel electrolytes enable higher stability operation of full‐cell lithium‐ion batteries, resulting in significantly enhanced cycling performance.

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Section: Resultsmentioning

confidence: 99%

Layered Heterostructure Ionogel Electrolytes for High‐Performance Solid‐State Lithium‐Ion Batteries

et al. 2021

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“…IG materials retain the benefits of solid electrolytes (no leakage, dimensional stability, the potential for fabricating thinner electrolytes) while also maintaining the high ionic conductivity and electrochemical stability of ILEs. One family of IGs is based on having ionic liquids swelled into polymer matrices creating freestanding solids. − Although IG electrolytes for LIB research are more common (primarily for nonflammable and high-temperature applications), there are some reports regarding IGs for SIBs. Singh et al, for example, reported an IG electrolyte consisting of an ionic liquid immobilized by poly(ethylene oxide) .…”

Section: Introductionmentioning

confidence: 99%

Siloxane-Modified, Silica-Based Ionogel as a Pseudosolid Electrolyte for Sodium-Ion Batteries

DeBlock

Wei

Ashby

et al. 2020

ACS Appl. Energy Mater.

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We report the synthesis of a Na-ion-conducting ionogel (IG) electrolyte using a one-pot, siloxane-modified sol−gel approach. The resulting pseudosolid electrolyte provides a nonflammable alternative to traditional carbonate liquids and demonstrates a wide stability window (5 V) as well as a high roomtemperature ionic conductivity (∼1 mS cm −1 ). The IG exhibits excellent interfacial properties in contact with both negative and positive Na + electrodes, enabling the operation of a solid-state sodium-ion battery.

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“…In the amorphous region, lithium ions can better rely on the chain segment motion for transference. 49 Figure 3b shows the infrared spectrum of the polymer electrolyte. The spectral peaks at 1393 and 1370 cm −1 are δ s (OSO), and the spectral peak at 554 cm −1 is δ as (OSO).…”

Section: Resultsmentioning

confidence: 99%

Solid-State Polymer Electrolyte Solves the Transfer of Lithium Ions between the Solid–Solid Interface of the Electrode and the Electrolyte in Lithium–Sulfur and Lithium-Ion Batteries

Shan

Yang

2021

ACS Appl. Energy Mater.

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The use of secondary batteries has been on the rise in recent years, especially solid-state batteries. However, security issues have become a major challenge in practical applications. Both lithium-ion batteries and lithium−sulfur batteries have safety problems that need to be solved. Herein, a polymer electrolyte suitable for the two types of batteries was easily synthesized. A polyvinylidene fluoride (PVDF)-based polymer electrolyte with 1butyl-1-methyl pyrrolidine bis-trifluoromethyl sulfonimide (Py 14 TFSI) was used as the solid electrolyte. The ionic conductivity of the LiTFSI/Py 14 TFSI/cellulose acetate (CA)/ PVDF polymer electrolyte was 1.45 × 10 −4 S cm −1 . The electrochemical stability window was 4.95 V. The transference number of the lithium ion was 0.231. The constant-current polarization test results showed that the polarization voltage was only 0.04 V when the current density was 1 mA cm −2 . The first discharge specific capacity of the Li | LiTFSI/Py 14 TFSI/CA/PVDF | LiFePO 4 battery was 125.7 mA h g −1 (0.5 C), and the capacity retention rate was 95.22% after 50 cycles at room temperature. A multistage porous conductive carbon (M-PCC) material with micropores and mesopores was applied as the host of the sulfur cathode of lithium−sulfur batteries. The M-PCC material provided a carrier for sulfur and sulfide with a specific surface area of 1132.68 m 2 g −1 . The solid-state lithium−sulfur battery (Li | LiTFSI/ Py 14 TFSI/CA/PVDF | S@M-PCC) had excellent electrochemical performance. The first discharge specific capacity was 1245.9 mA h g −1 with an average Coulombic efficiency of 97.34%. The energy of Py 14 TFSI cation and Li 2 S 8 calculated by DFT was 8.8345 eV, which indicated that the polysulfide cannot adsorb onto the polymer electrolyte. XPS was used to measure the elemental composition of the anode−electrolyte interface after charge−discharge cycling. The uniform growth of lithium dendrite was observed by the SEM image of the anode after cycles. The results showed that a solid-state lithium−sulfur battery produced uniform solid electrolyte interface films and completely suppressed the shuttle effect.

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Nanocomposite Ionogel Electrolytes for Solid‐State Rechargeable Batteries

Cited by 48 publications

References 51 publications

Layered Heterostructure Ionogel Electrolytes for High‐Performance Solid‐State Lithium‐Ion Batteries

Layered Heterostructure Ionogel Electrolytes for High‐Performance Solid‐State Lithium‐Ion Batteries

Siloxane-Modified, Silica-Based Ionogel as a Pseudosolid Electrolyte for Sodium-Ion Batteries

Solid-State Polymer Electrolyte Solves the Transfer of Lithium Ions between the Solid–Solid Interface of the Electrode and the Electrolyte in Lithium–Sulfur and Lithium-Ion Batteries

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