Enhanced ionic conductivity and interface stability of hybrid solid-state polymer electrolyte for rechargeable lithium metal batteries

Li, Qiao; Liu, Yangyang; Jiao, Xingxing; Song, Zhongxiao; Sadd, Matthew; Xu, Xin; Matic, Aleksandar; Xiong, Shizhao; Song, Jiangxuan

doi:10.1016/j.ensm.2019.05.023

Cited by 108 publications

(61 citation statements)

References 59 publications

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“…The peak at $54.5 eV stems from Li 2 O 2 and LiOH, which is an unstable state (Lu et al, 2008;Nasybulin et al, 2013). By contrast, the peaks at around 53.7, 55.1, and 55.9 eV are originated from Li 2 O, Li 2 CO 3 , and LiF, respectively (Edströ m et al, 2006;Liu et al, 2019a). Obviously, the peak at $54.5 eV in ABCM is the weakest, indicating the fewest broken SEI in ABCM route, which can be attributed to that very few new Li metal (dendrite) contacted with electrolyte by this route.…”

Section: Resultsmentioning

confidence: 99%

“…A stable Li metal anode is a key point for the practical application of Li metal battery (LMB) (Cheng et al, 2017;Lu et al, 2014;Qiao et al, 2017;Zhang et al, 2018). Therefore, explorations on non-dendrite anode and reducing dead Li are eagerly required, such as high-modulus SEI film coating on Li metal (Liu et al, 2019a;Shi et al, 2018;Wang et al, 2017b), high-surface-energy substrate (Hou et al, 2019;Wang et al, 2017a), low local current density (Zhang et al, 2017), more reaction sites , cross-linking film (Zhao et al, 2019), and so on (Liang et al, 2019;Westover et al, 2019;Xu et al, 2019). However, once the uncontrollable dendrite occurs, the negative feedback cycle (SEI broken, dendrite worsen and so on) that follows would cause Li metal anode's failure quickly.…”

Section: Introductionmentioning

confidence: 99%

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Synchronous Healing of Li Metal Anode via Asymmetrical Bidirectional Current

Wang

Qin

et al. 2020

iScience

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The creation of Li metal anodes while minimizing dendrite growth is an important challenge for developing high-energy density batteries. Dendrites can originate from an inhomogeneous charge distribution or an irregular substrate, and often, the way to suppress dendrite growth is to avoid their formation altogether (ion-uniform mechanism over a shelf time). Herein, we propose a different route to eliminate dendrite formation, called an asymmetrical bidirectional current mode (ABCM) of charging, leading to a healable Li metal anode and resulting in a positive feedback cycle. This mode allows for a stable cyclic performance and suppresses dendrite formation effectively (while holding the polarization $27 mV for over 1,000 h), and provides a better result than suppressing Li dendrites via weakening of the Li dendrite (ion-uniform mechanism). These results indicate that ABCM may be a promising way to stabilize the Li anode of Li metal batteries, without any chemical/physical modification of the anode.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synchronous Healing of Li Metal Anode via Asymmetrical Bidirectional Current

Wang

Qin

et al. 2020

iScience

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“…23,24,[72][73][74] Song et al used PVDF-HFP/PEO as an organic matrix, LAGP and a solvate ionic liquid as the ller to develop a high-performance hybrid SSE (named PPLS90) with outstanding environmental and thermal stability. 75 The PPLS90 can be exposed to a ame for 30 s and does not ignite, whereas the Celgard separator with a liquid electrolyte ignited easily (Fig. 5c).…”

Section: àmentioning

confidence: 99%

Toward safer solid-state lithium metal batteries: a review

et al. 2020

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“…[ 15–17 ] However, the excessive interfacial resistance and the complex processing art of inorganic SSEs limit their practical application. [ 18–20 ] Solid polymer electrolytes (SPEs), on the other hand, can offer good flexibility and stable contact between the electrodes and electrolytes. [ 20–23 ] Several types of polymer matrices have been developed, such as poly(ethyleneoxide) (PEO), [ 24–26 ] polycarbonate, [ 27–29 ] and polysiloxane.…”

Section: Figurementioning

confidence: 99%

“…[ 18–20 ] Solid polymer electrolytes (SPEs), on the other hand, can offer good flexibility and stable contact between the electrodes and electrolytes. [ 20–23 ] Several types of polymer matrices have been developed, such as poly(ethyleneoxide) (PEO), [ 24–26 ] polycarbonate, [ 27–29 ] and polysiloxane. [ 30–32 ] SPEs are prepared by mixing polymer matrices with Li salts.…”

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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Enhanced ionic conductivity and interface stability of hybrid solid-state polymer electrolyte for rechargeable lithium metal batteries

Cited by 108 publications

References 59 publications

Synchronous Healing of Li Metal Anode via Asymmetrical Bidirectional Current

Synchronous Healing of Li Metal Anode via Asymmetrical Bidirectional Current

Toward safer solid-state lithium metal batteries: a review

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

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