Grafted polyrotaxanes as highly conductive electrolytes for lithium metal batteries

Imholt, Laura; Dörr, Tobias S.; Zhang, Peng; Ibing, Lukas; Cekic‐Laskovic, Isidora; Winter, Martin; Brunklaus, Gunther

doi:10.1016/j.jpowsour.2018.08.077

Cited by 63 publications

(40 citation statements)

References 55 publications

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“…Cyclodextrins have recently entered the field of batteries as well, as witnessed by the design of highly stretchable binders integrating sliding ring polyrotaxanes 15 , e.g., selfassembled architectures of cyclodextrins to auto-repair fractured Si electrodes. Such supramolecular structures were also used as ionic conducting polymer membrane in Li-ion batteries 16,17 and cyclodextrins trapping properties were exploited by placing cyclodextrins polymers in S-based electrodes to address the redox shuttle issue in Li-S batteries, e.g., migration of soluble polysulfides Li 2 S n (3 ≤ n ≤ 8), intermediates back and forth between the two electrodes 18 . Alternatively, other strategies to tackle the polysulfide shuttle effect have focused on the separator to prevent (S n ) 2− diffusion to the anode with either micro intrinsic porosity 19,20 or using grafting chemistry to repeal (S n ) 2− via repulsive electrostatic interactions 21 .…”

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confidence: 99%

Single-sulfur atom discrimination of polysulfides with a protein nanopore for improved batteries

et al. 2020

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Research on batteries mostly focuses on electrodes and electrolytes while few activities regard separator membranes. However, they could be used as a toolbox for injecting chemical functionalities to capture unwanted species and enhance battery lifetime. Here, we report the use of biological membranes hosting a nanopore sensor for electrical single molecule detection and use aqueous sodium polysulfides encountered in sulfur-based batteries for proof of concept. By investigating the host-guest interaction between polysulfides of different chain-lengths and cyclodextrins, via combined chemical approaches and molecular docking simulations, and using a selective nanopore sensor inserted into a lipid membrane, we demonstrate that supramolecular polysulfide/cyclodextrin complexes only differing by one sulfur can be discriminated at the single molecule level. Our findings offer innovative perspectives to use nanopores as electrolyte sensors and chemically design membranes capable of selective speciation of parasitic molecules for battery applications and therefore pave the way towards smarter electrochemical storage systems.

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confidence: 99%

Single-sulfur atom discrimination of polysulfides with a protein nanopore for improved batteries

et al. 2020

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Section: Macromolecular Design Of Polymer Matrixmentioning

confidence: 99%

“…In macromolecular design, functional groups are grafted at the end of the polymer matrix to construct a more complicated macromolecular structure, in which the big side chains can provide large free volume for the motion of conductive segments. For example, a supramolecular structure composed of a linear PEO threaded by cyclic ring cyclodextrins (CDs) was grafted by caprolactone (PCL) in CDs and at the polymer ends simultaneously (Figure 4c), [ 98 ] which shows a high ionic conductivity of 1.0 × 10 −3 S cm −1 at 60 °C. Moreover, DSC and Fourier‐transform infrared spectroscopy (FT‐IR) analysis implied that Li + is mainly coordinated with PCL side chains, and the ester groups in the PCL induces an increase of t Li+ to 0.61.…”

Section: Macromolecular Design Of Polymer Matrixmentioning

confidence: 99%

Macromolecular Design of Lithium Conductive Polymer as Electrolyte for Solid‐State Lithium Batteries

Meng

Lian

Cui

2020

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In the development of solid‐state lithium batteries, solid polymer electrolyte (SPE) has drawn extensive concerns for its thermal and chemical stability, low density, and good processability. Especially SPE efficiently suppresses the formation of lithium dendrite and promotes battery safety. However, most of SPE is derived from the matrix with simple functional group, which suffers from low ionic conductivity, reduced mechanical properties after conductivity modification, bad electrochemical stability, and low lithium‐ion transference number. Appling macromolecular design with multiple functional groups to polymer matrix is accepted as a strategy to solve the problems of SPE fundamentally. In this review, macromolecular design based on lithium conducting groups is summarized including copolymerization, network construction, and grafting. Meanwhile, the construction of single‐ion conductor polymer is also focused herein. Moreover, synergistic effects between the designed matrix, lithium salt, and fillers are reviewed with the objective to further improve the performance of SPE. At last, future studies on macromolecular design are proposed in the development of SPE for solid‐state batteries with high energy density and durability.

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“…[202][203][204] A more convenient and low-cost method is polymer blending, using which enhanced oxidation resistance and better cycling performance could be achieved. [205][206][207] Moreover, introducing side chains in linear PEO is also a useful method to improve its resistance to oxidation up to 4.73 V. [208] Constructing a laminated SPE by placing an antioxidant SPE layer at the cathode side and an antireductive SPE layer at the anode side is also promising due to the excellent fabricability of the SPE. Duan et al used a conventional tape-casting method to fabricate a double-layer SPE (Figure 13e) where the combination of an LAGP-added PAN layer (antioxidant) and a PEGDA layer (antireductive) ensured good electrochemical stability on both electrodes, leading to a relatively high capacity retention of 82% after 200 cycles at 0.5 C at a high cut-off voltage of 4.5 V for the Li/SPE/NCM battery.…”

Section: Interface Between Spe and Cathodementioning

confidence: 99%

Electrochemical Compatibility of Solid‐State Electrolytes with Cathodes and Anodes for All‐Solid‐State Lithium Batteries: A Review

Chen

Xie

Zhao

et al. 2021

Adv Energy and Sustain Res

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All-solid-state lithium-metal batteries (ASSLMBs) are considered promising nextgeneration energy-storage devices for their high safety, high energy density, and long cycle life, where solid-state electrolytes (SSEs) play an essential role in adapting a lithium metal anode to a high-capacity cathode. However, there are still many obstacles to overcome for SSEs, including the narrow electrochemical window with an oxide cathode and a Li anode, low ionic conductivity, and poor interfacial mechanical property. Herein, the critical issues of electrochemical compatibility between some key SSEs and their adaptive electrode materials are focused on. The adaptation of different SSEs to electrode materials is summarized, recent methods for improving the electrochemical compatibility of SSE/ electrode interfaces are highlighted, and the perspective for future development of SSEs is discussed.

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Grafted polyrotaxanes as highly conductive electrolytes for lithium metal batteries

Cited by 63 publications

References 55 publications

Single-sulfur atom discrimination of polysulfides with a protein nanopore for improved batteries

Single-sulfur atom discrimination of polysulfides with a protein nanopore for improved batteries

Macromolecular Design of Lithium Conductive Polymer as Electrolyte for Solid‐State Lithium Batteries

Electrochemical Compatibility of Solid‐State Electrolytes with Cathodes and Anodes for All‐Solid‐State Lithium Batteries: A Review

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