A novel solid PEO/LLTO-nanowires polymer composite electrolyte for solid-state lithium-ion battery

Zhu, Lin; Zhu, Penghui; Fang, Qunxiang; Jing, Maoxiang; Shen, Xiangqian; Yang, Lizhong

doi:10.1016/j.electacta.2018.10.005

Cited by 157 publications

(94 citation statements)

References 37 publications

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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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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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“…Thus, it is necessary to comprehensively improve the SPE properties for better Li metal battery performance. Recently tremendous effort has been focused on preparing composite polymer electrolytes (CPEs) by adding inorganic nanofillers into the polymer matrices to enhance the mechanical properties, electrochemical stability and ionic conductivity [18][19][20][21][22][23][24][25]. Nevertheless, it is difficult to greatly increase the mechanical strength by using the nanofillers for commercial applications due to the failure of forming interconnected reinforcements [3,26].…”

Section: Introductionmentioning

confidence: 99%

Flexible, high-voltage, ion-conducting composite membranes with 3D aramid nanofiber frameworks for stable all-solid-state lithium metal batteries

Liu

Lyu

et al. 2020

Sci. China Mater.

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The practical application of solid polymer electrolytes in high-energy Li metal batteries is hindered by Li dendrites, electrochemical instability and insufficient ion conductance. To address these issues, flexible composite polymer electrolyte (CPE) membranes with three dimensional (3D) aramid nanofiber (ANF) frameworks are facilely fabricated by filling polyethylene oxide (PEO)-lithium bis(trifluoromethylsulphonyl)imide (LiTFSI) electrolyte into 3D ANF scaffolds. Because of the unique composite structure design and the continuous ion conduction at the 3D ANF framework/PEO-LiTFSI interfaces, the CPE membranes show higher mechanical strength (10.0 MPa), thermostability, electrochemical stability (4.6 V at 60°C) and ionic conductivity than the pristine PEO-LiTFSI electrolyte. Thus, the CPEs display greatly improved interfacial stability against Li dendrites (≥1000 h at 30°C under 0.10 mA cm −2), compared with the pristine electrolyte (short circuit in 13 h). The CPE-based all-solid-state LiFePO 4 /Li cells also exhibit superior cycling performance (e.g., 130 mA h g −1 with 93% retention after 100 cycles at 0.4 C) than the ANF-free cells (e.g., 82 mA h g −1 with 66% retention). This work offers a simple and effective way to achieve high-performance composite electrolyte membranes with 3D nanofiller framework for promising solid-state Li metal battery applications.

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“…As the capacity and safety requirements of electronic equipment and electric automobiles increase, advanced energy storage technology has become more urgent, in which solid‐state lithium batteries (SSBs) have potential development prospects due to their high theoretical energy density and safety. However, the low room‐temperature (RT) ionic conductivity of solid electrolyte (SE) and poor interface compatibility between electrodes and electrolyte are always the crucial problems to restrain the rate performance of SSBs …”

Section: Introductionmentioning

confidence: 99%

A novel organic/inorganic composite solid electrolyte with functionalized layers for improved room‐temperature rate performance of solid‐state lithium battery

et al. 2019

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Summary High ionic conductivity at room temperature (RT) and good ion transport capability at electrode/electrolyte interface are fundamental requirements for high‐rate solid‐state lithium batteries (SSBs). In this work, we designed a poly (propylene carbonate) (PPC)‐based organic/inorganic composite solid electrolyte (CSE) membrane with high filling of tantalum‐doped lithium lanthanum zirconium oxide (LLZTO) and functionalized layers for enhancing the RT rate performance of SSB. The synergistic effect of LLZTO and interfacial functionalized layers endows the NCM622/CSE/Li battery with high‐rate and cycling performances at RT. The SSB with 20% LLZTO‐filled solid electrolyte shows the initial capacities of 162.0, 148.5 and 130.1 mAh g−1 at 1C, 2C, and 3C respectively, with retention capacities of 115.6, 104, and 100.6 mAh g−1 after 150 cycles. This strategy for an organic/inorganic CSE is of great practical significance for the development of high‐rate SSBs.

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A novel solid PEO/LLTO-nanowires polymer composite electrolyte for solid-state lithium-ion battery

Cited by 157 publications

References 37 publications

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

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

Flexible, high-voltage, ion-conducting composite membranes with 3D aramid nanofiber frameworks for stable all-solid-state lithium metal batteries

A novel organic/inorganic composite solid electrolyte with functionalized layers for improved room‐temperature rate performance of solid‐state lithium battery

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