Ion‐Conductive and Thermal Properties of a Synergistic Poly(ethylene carbonate)/Poly(trimethylene carbonate) Blend Electrolyte

Li, Zhenguang; Mogensen, Ronnie; Mindemark, Jonas; Bowden, Tim; Brandell, Daniel; Tominaga, Yoichi

doi:10.1002/marc.201800146

Cited by 23 publications

(20 citation statements)

References 30 publications

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“…31 Interestingly, in a PEC electrolyte system containing Li bis(trifluoromethane sulfonyl)imide (LiTFSI), Brandell et al showed that the blending of poly(trimethylene carbonate) (PTMC) at optimized ratio can increase the conductivity as high as 10 À6 S cm À1 at 50 C, indicating that host polymers can affect the ion transport and conductivity. 32,33 To overcome the strong EO-Li + interactions, Bao et al designed a loosely coordinated poly(tetrahydrofuran) (PTHF) host that is similar to PEO but contains fewer oxygen heteroatoms in polymer backbone. 34 Due to the weakened O-Li + interactions, the crosslinked PTHF-based electrolyte shows promising conductivity of 2.9 3 10 À6 S cm À1 and a Li transference number of 0.53.…”

Section: Context and Scalementioning

confidence: 99%

Poly(Ionic Liquid)s-in-Salt Electrolytes with Co-coordination-Assisted Lithium-Ion Transport for Safe Batteries

Wang

Chen

Girard

et al. 2019

Joule

140

142

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The properties of polymer hosts and their interactions with lithium salt are critically important for the design of alternative polymer electrolytes for safe lithium battery applications. Herein, we report a poly(ionic liquid) host as a solid electrolyte platform and propose a different coordination mechanism manipulating lithiumion diffusion compared with traditional polymer systems. Our finding provides a new strategy to develop high-performance polymer electrolytes for nextgeneration high-energy-density lithium-metal batteries.

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Section: Context and Scalementioning

confidence: 99%

Poly(Ionic Liquid)s-in-Salt Electrolytes with Co-coordination-Assisted Lithium-Ion Transport for Safe Batteries

Wang

Chen

Girard

et al. 2019

Joule

140

142

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“…Tominaga and co‐workers studied the phase behavior and ionic conductivity of poly(ethylene carbonate) (PEC) / poly(trimethylene carbonate) (PTMC) / LiTFSI blends. [ 35 ] They observed a synergistic effect on ionic conductivity when PEC/PTMC became compatible. We believe that this can be attributed to the extremely grain size and disappearance of interphase in the compatible blends, which is in agreement with our result.…”

Section: Figurementioning

confidence: 99%

Simultaneous Improvement of Ionic Conductivity and Mechanical Strength in Block Copolymer Electrolytes with Double Conductive Nanophases

Cao

Yang

et al. 2020

Macromol. Rapid Commun.

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The most daunting challenge of solid polymer electrolytes (SPEs) is the development of materials with simultaneously high ionic conductivity and mechanical strength. Herein, SPEs of lithium bis‐(trifluoromethanesulfonyl)imide (LiTFSI)‐doped poly(propylene monothiocarbonate)‐b‐poly(ethylene oxide) (PPMTC‐b‐PEO) block copolymers (BCPs) with both blocks associating with Li+ ions are prepared. It is found that the PPMTC‐b‐PEO/LiTFSI electrolytes with double conductive phases exhibit much higher ionic conductivity (2 × 10−4 S cm−1 at r.t.) than the BCP electrolytes with a single conductive phase. Concurrently, the storage moduli of PPMTCn‐b‐PEO44/LiTFSI electrolytes are ≈1–4 orders of magnitude higher than that of the neat PEO/LiTFSI electrolytes. Therefore, simultaneous improvement of ionic conductivity and mechanical properties is achieved by construction of a microphase‐separated and disordered structure with double conductive phases.

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“…Due to the high crystallinity of PEO, PEO‐based SPEs have a low ionic conductivity (10 −8 –10 −7 S cm −1 ) at room temperature, which does not meet the requirement for ionic conductivity (>10 −4 S cm −1 at room temperature) of electrolytes with promising applications. [ 33,36,37 ] Many strategies, such as adding inorganic nanoparticles, [ 38–40 ] blending, [ 41 ] copolymerization, [ 42 ] and crosslinking [ 43–45 ] have been adopted to effectively suppress the crystallization of PEO and improve the ionic conductivity of PEO‐based SPEs. Coat et al [ 46 ] reported the synthesis of poly(diethylene oxide‐alt‐oxymethylene) (P(2EO‐MO)) as a polymer matrix for SPE, which has higher T g than that of PEO in the electrolyte.…”

Section: Figurementioning

confidence: 99%

Investigation on the Copolymer Electrolyte of Poly(1,3‐dioxolane‐co‐formaldehyde)

Liu

Yang

et al. 2020

Macromol. Rapid Commun.

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have been found in preventing the pen etration of Li dendrites. [15][16][17] However, the excessive interfacial resistance and the complex processing art of inorganic SSEs limit their practical application. [18][19][20] Solid polymer electrolytes (SPEs), on the other hand, can offer good flexibility and stable contact between the electrodes and electrolytes. [20][21][22][23] Several types of polymer matrices have been developed, such as poly(ethyleneoxide) (PEO), [24][25][26] poly carbonate, [27][28][29] and polysiloxane. [30][31][32] SPEs are prepared by mixing polymer matrices with Li salts. PEO is the most popular and deeply studied polymer matrix, [33] and the ethylene oxide chain segments in PEO can dissolve Li salts as well as form complexes with Li + and dis sociated Li salts. [34] Li + is conducted by repeatedly carrying out a "decomplexa tion-recomplexation" process through the movement of chain segments in an amorphous polymer region. [35] The movement of chain segments in an amorphous polymer region is affected by the glass transition temperature (T g ) and crystallinity. Low T g and crystallinity are beneficial for the move ment of chain segments as well as the ionic conductivity. Due to the high crystallinity of PEO, PEObased SPEs have a low ionic conductivity (10 −8 -10 −7 S cm −1 ) at room temperature, which does not meet the requirement for ionic conductivity (>10 −4 S cm −1 at room temperature) of electrolytes with prom ising applications. [33,36,37] Many strategies, such as adding inorganic nanoparticles, [38][39][40] blending, [41] copolymerization, [42] and crosslinking [43][44][45] have been adopted to effectively sup press the crystallization of PEO and improve the ionic conduc tivity of PEObased SPEs. Coat et al. [46] reported the synthesis of poly(diethylene oxidealtoxymethylene) (P(2EOMO)) as a polymer matrix for SPE, which has higher T g than that of PEO in the electrolyte. They found the P(2EOMO)/LiTFSI electro lyte exhibits a slightly lower ionic conductivity due to higher T g , but much higher Li ion transference number can be obtained in P(2EOMO)/LiTFSI electrolyte (0.36) than that in PEO/ LiTFSI (0.19). So tailoring the main chain structure is the most feasible way to optimize the performance of SPEs.Recently, the strategy of in situ polymerizing SPEs in the batteries has attracted extensive attention due to the ability to construct stable ionic conduction networks inside the electrodes to reduce the interfacial resistance, the biggest challenge faced by most SSEs. Cui et al. [13] in situ prepared A series of copolymers are prepared via cationic ring-opening polymerization with 1,3-dioxolane (DOL) and trioxymethylene (TOM) as monomers. The crystallization behaviors of the copolymers can be suppressed by adjusting the ratio of DOL/TOM. With LiBF 4 as a source for a BF 3 initiator, copolymer electrolytes (CPEs) can be prepared in situ inside cells without needing nonelectrolyte catalysts or initiators. The ionic conductivities and Li + diffusion coefficients (D Li + ) of the CPEs inc...

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Ion‐Conductive and Thermal Properties of a Synergistic Poly(ethylene carbonate)/Poly(trimethylene carbonate) Blend Electrolyte

Cited by 23 publications

References 30 publications

Poly(Ionic Liquid)s-in-Salt Electrolytes with Co-coordination-Assisted Lithium-Ion Transport for Safe Batteries

Poly(Ionic Liquid)s-in-Salt Electrolytes with Co-coordination-Assisted Lithium-Ion Transport for Safe Batteries

Simultaneous Improvement of Ionic Conductivity and Mechanical Strength in Block Copolymer Electrolytes with Double Conductive Nanophases

Investigation on the Copolymer Electrolyte of Poly(1,3‐dioxolane‐co‐formaldehyde)

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