2D boron nitride nanoflakes as a multifunctional additive in gel polymer electrolytes for safe, long cycle life and high rate lithium metal batteries

Shim, Ji-Yeon; Kim, Hee Joong; Kim, Byoung Gak; Kim, Yong Seok; Kim, Dong Gyun; Lee, Jong Chan

doi:10.1039/c7ee01095h

Cited by 297 publications

(193 citation statements)

References 50 publications

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“…While ILE shows a free TFSI − anion intensity of only 76%, IL GPE displays 85% of Li + ‐uncoordinated anions due to the interaction between the anions and the fluorinated polymer chains. [ 28 ] 1.5BN GPE exhibits 92% of Li + ‐uncoordinated anions, demonstrating a larger content of dissociated Li + ions through immobilization of TFSI − anion by the functionalized BNNS addition. These trends are consistent with the obtained t Li+ values of the corresponding electrolytes (Figure 2b).…”

Section: Resultsmentioning

confidence: 99%

Amine‐Functionalized Boron Nitride Nanosheets: A New Functional Additive for Robust, Flexible Ion Gel Electrolyte with High Lithium‐Ion Transference Number

Kim

Liu

et al. 2020

Adv Funct Materials

108

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Ion gel electrolytes show great potential in solid-state batteries attributed to their outstanding characteristics. However, because of the strong ionic nature of ionic liquids, ion gel electrolytes generally exhibit low lithium-ion transference number, limiting its practical application. Aminefunctionalized boron nitride (BN) nanosheets (AFBNNSs) are used as an additive into ion gel electrolytes for improving their ion transport properties. The AFBNNSs-ion gel shows much improved mechanical strength and thermal stability. The lithium-ion transference number is increased from 0.12 to 0.23 due to AFBNNS addition. More importantly, for the first time, nuclear magnetic resonance analysis reveals that the amine groups on the BN nanosheets have strong interaction with the bis(trifluoromethanesulfonyl)imide anions, which significantly reduces the anion mobility and consequently increases lithium-ion mobility. Battery cells using the optimized AFBNNSs-ion gel electrolyte exhibit stable lithium deposition and excellent electrochemical performance. A LiFePO 4 |Li cell retains 92.2% of its initial specific capacity after the 60th cycle while the cell without AFBNNSs-gel electrolyte only retains 53.5%. The results not only demonstrate a new strategy to improve lithium-ion transference number in ionic liquid electrolytes, but also open up a potential avenue to achieve solid-state lithium metal batteries with improved performance. and high safety levels. Lithium metal batteries (LMBs), owing to the low redox potential (−3.04 V vs standard hydrogen electrode) and ultrahigh theoretical capacity (3860 mAh g −1 ) of the lithium (Li) metal anode, are promising to fulfill these requirements. [1] However, the organic liquid electrolyte (LE), currently widely used in the LMBs, makes LMBs face severe safety concerns such as electrolyte leakage and combustion due to the intrinsic fluidity, flammability, and electrochemical instability. Replacing the organic liquid electrolyte with solid-state electrolytes (SSEs) has been proven to be an efficient way to overcome these problems. [2] Because of their high mechanical stability and structural integrity, SSEs enable facile cell fabrication and prevent electrolyte leakage, offering greater safety than liquid electrolytes. Current solid-state electrolytes include solid polymer electrolytes (SPEs) and inorganic electrolytes (IEs). Unfortunately, SPEs suffer from a poor ionic conductivity at room temperature, while the IEs show innate brittleness and intrinsically narrow electrochemical stability along with high contact resistance. Compared to SPEs and IEs, gel electrolytes, which are prepared by entrapping liquid electrolytes into a solid matrix, provide exceptional properties such as high ionic conductivity, low interfacial resistance, good mechanical strength, and flexibility.Liquid mediums are one of the key components in gel electrolytes. Among the candidates, ionic liquids (ILs), also known as room temperature molten salts, can result in high performance gel electrolytes because of the...

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Section: Resultsmentioning

confidence: 99%

Amine‐Functionalized Boron Nitride Nanosheets: A New Functional Additive for Robust, Flexible Ion Gel Electrolyte with High Lithium‐Ion Transference Number

Kim

Liu

et al. 2020

Adv Funct Materials

108

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“…Solid polymer electrolytes (SPEs) are an ideal alternative to liquid electrolytes;t hey usually react with lithium metal to form the unstables olide lectrolyte interphase (SEI). [3,4] Polymer electrolytes (PEs) with good mechanical strength can suppress the growth of dendrite structures and show excellent stability with lithiuma nodes. They are considered as an effective solution to the problems mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Self‐Healing Polymer Electrolytes Formed via Dual‐Networks: A New Strategy for Flexible Lithium Metal Batteries

Zhou

Zuo

Xiao

et al. 2018

Chemistry A European J

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A novel polymer electrolyte with mechanically robust and self‐healing properties was fabricated through a dual‐network structure, crosslinked by quadruple hydrogen bonding and chemical bonding. The dynamic ureido‐pyrimidinone (UPy) dimers were the first network in the polymer matrix. This group endows the polymer electrolyte with good self‐healing capacity and improves the reliability and lifetime of the polymer lithium batteries. The crosslinked polyethylene glycol‐bis‐carbamate dimethacrylate (PEGBCDMA) is the second network and guarantees dimensional stability and good mechanical properties of the polymer electrolyte. The dual‐network self‐healing polymer electrolyte (DN‐SHPE) exhibits improved ionic conductivity versus the polymer electrolyte fabricated by poly(ethylene glycol) diacrylate (PEGDA). It has high thermal stability (up to 350 °C) and excellent interfacial stability with the electrodes. When the DN‐SHPE‐based cells were fabricated with LiFePO4 and Li metal, the resulting cells show good reversible specific capacity and considerable rate capability. Moreover, the pouch cell could maintain electrochemical function even under deformation or folding conditions.

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“…A modified GO was also prepared to increase compatibility with polymer matrixes by Shim et al [170]. Recently, Shim et al [172] used a 3-4 nm-thick functionalized BN as an additive along with P(VDF-co-HFP) as a matrix to fabric an composite electrolyte (Fig. 8d) and found that even with small amounts of BN (0.5 wt%), the resulting composite electrolyte is still capable of providing unexpectedly high ionic conductivities (Fig.…”

Section: Shapes Of Inorganic Fillersmentioning

confidence: 99%

Recent Advancements in Polymer-Based Composite Electrolytes for Rechargeable Lithium Batteries

Tan

Zeng

et al. 2018

Electrochem. Energ. Rev.

305

170

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In recent years, lithium batteries using conventional organic liquid electrolytes have been found to possess a series of safety concerns. Because of this, solid polymer electrolytes, benefiting from shape versatility, flexibility, low-weight and low processing costs, are being investigated as promising candidates to replace currently available organic liquid electrolytes in lithium batteries. However, the inferior ion diffusion and poor mechanical performance of these promising solid polymer electrolytes remain a challenge. To resolve these challenges and improve overall comprehensive performance, polymers are being coordinated with other components, including liquid electrolytes, polymers and inorganic fillers, to form polymer-based composite electrolytes. In this review, recent advancements in polymer-based composite electrolytes including polymer/ liquid hybrid electrolytes, polymer/polymer coordinating electrolytes and polymer/inorganic composite electrolytes are reviewed; exploring the benefits, synergistic mechanisms, design methods, and developments and outlooks for each individual composite strategy. This review will also provide discussions aimed toward presenting perspectives for the strategic design of polymer-based composite electrolytes as well as building a foundation for the future research and development of high-performance solid polymer electrolytes.

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2D boron nitride nanoflakes as a multifunctional additive in gel polymer electrolytes for safe, long cycle life and high rate lithium metal batteries

Abstract: Highly dendrite-suppressing gel polymer electrolytes for lithium metal batteries are presented utilizing perfluoropolyether-functionalized 2D boron nitride nanoflakes as a multifunctional additive.

Cited by 297 publications

References 50 publications

Amine‐Functionalized Boron Nitride Nanosheets: A New Functional Additive for Robust, Flexible Ion Gel Electrolyte with High Lithium‐Ion Transference Number

Amine‐Functionalized Boron Nitride Nanosheets: A New Functional Additive for Robust, Flexible Ion Gel Electrolyte with High Lithium‐Ion Transference Number

Self‐Healing Polymer Electrolytes Formed via Dual‐Networks: A New Strategy for Flexible Lithium Metal Batteries

Recent Advancements in Polymer-Based Composite Electrolytes for Rechargeable Lithium Batteries

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