<i>In situ</i>construction of polyether-based composite electrolyte with bi-phase ion conductivity and stable electrolyte/electrode interphase for solid-state lithium metal batteries

Zheng, Shujun; Chen, Yuyang; Chen, Kai; Yang, Shengrong; Bagherzadeh, Roohollah; Miao, Yue-E; Liu, Tianxi

doi:10.1039/d2ta02229j

Cited by 25 publications

(14 citation statements)

References 41 publications

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“…For the PS‐0.5 system, because of the assistance of the organic/inorganic composite gel electrolyte, the Li + concentration polarization is well‐moderated at the electrolyte/electrode interface. [ 12 ] Thereby, the Li + plating/stripping processes proceed uniformly and are highly reversible, thus reducing interfacial side reactions, achieving smooth LM surfaces, and enabling outstanding long‐term cyclability.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, highly concentrated electrolytes, because of their high viscosities and low conductivities, induce aggregation of anions and cations and reduce the transference number of Li + , also detrimental to Li + transport and battery performances. [ 11,12 ] Addition of additives, for examples, LiNO 3 , fluoroethylene carbonate (FEC), etc., to LE has also been found effective toward stabilization of the interphase. These additives can be preferentially reduced to form stable inorganic‐rich interphase on LM.…”

Section: Introductionmentioning

confidence: 99%

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Inorganic Filler Enhanced Formation of Stable Inorganic‐Rich Solid Electrolyte Interphase for High Performance Lithium Metal Batteries

Tao

Guo

et al. 2023

Adv Funct Materials

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Lithium metal (LM) is a promising anode material for next generation lithium ion based electrochemical energy storage devices. Critical issues of unstable solid electrolyte interphases (SEIs) and dendrite growth however still impede its practical applications. Herein, a composite gel polymer electrolyte (GPE), formed through in situ polymerization of pentaerythritol tetraacrylate with fumed silica fillers, is developed to achieve high performance lithium metal batteries (LMBs). As evidenced theoretically and experimentally, the presence of SiO2 not only accelerates Li+ transport but also regulates Li+ solvation sheath structures, thus facilitating fast kinetics and formation of stable LiF‐rich interphase and achieving uniform Li depositions to suppress Li dendrite growth. The composite GPE‐based Li||Cu half‐cells and Li||Li symmetrical cells display high Coulombic efficiency (CE) of 90.3% after 450 cycles and maintain stability over 960 h at 3 mA cm−2 and 3 mAh cm−2, respectively. In addition, Li||LiFePO4 full‐cells with a LM anode of limited Li supply of 4 mAh cm−2 achieve capacity retention of 68.5% after 700 cycles at 0.5 C (1 C = 170 mA g−1). Especially, when further applied in anode‐free LMBs, the carbon cloth||LiFePO4 full‐cell exhibits excellent cycling stability with an average CE of 99.94% and capacity retention of 90.3% at the 160th cycle at 0.5 C.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inorganic Filler Enhanced Formation of Stable Inorganic‐Rich Solid Electrolyte Interphase for High Performance Lithium Metal Batteries

Tao

Guo

et al. 2023

Adv Funct Materials

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“…[1][2][3][4] However, traditional lithium-ion batteries (LIBs) can hardly satisfy the growing demand because of the specific capacity restrictions of carbonaceous anodes and metallic oxide-based cathodes. [5][6][7][8][9][10] As a potential replacement, metallic lithium (Li) is known for the most potential anode of rechargeable batteries due to excellent theoretical specific capacity (3840 mAh g À1 ) and negative electrochemical potential (À3.04 V vs. standard hydrogen electrode). [10][11][12][13] Therefore, lithium metal batteries (LMBs), such as lithium-air and lithium-sulfur batteries, [14] are supposed to be anticipated candidates for next-generation energy storage devices.…”

Section: Introductionmentioning

confidence: 99%

A Fluorinated‐Polyimide‐Based Composite Nanofibrous Separator with Homogenized Pore Size for Wide‐Temperature Lithium Metal Batteries

et al. 2023

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Lithium (Li) is known for excellent theoretical specific capacity and most negative electrochemical potential, while still restricted by the irregular lithium dendrites and safety risks in practical applications of lithium metal batteries (LMBs) due to thermal runaway. Herein, a fluorinated‐polyimide (F‐PI)‐based composite nanofibrous separator containing poly(vinylidene fluoride) (PVDF) component, which is designed as PVDF/F‐PI, is developed via a facile electrospinning strategy for wide‐temperature LMBs. First, abundant polar trifluoromethyl (–CF3) groups in F‐PI create an electronegative environment to facilitate rapid Li‐ions (Li+) transport. Meanwhile, the PVDF component, acting as both the physical linker between F‐PI nanofibers and the regulator of homogenized pore size, simultaneously improves the mechanical properties and homogenizes the Li+ flux on the electrode surface. Therefore, a steady circulation of 2400 h is achieved for the symmetric cell using PVDF/F‐PI separator, which still displays a stable cycle life with a low voltage polarization of 15 mV in 1000 h even under 60 °C. Therefore, the fluorinated‐PI‐based composite nanofibrous separator with high ionic conductivity and uniform pore structure offers a practical method for design of functionalized separators in wide‐temperature LMB applications.

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“…95 Zheng et al obtained the LLTO NF framework by electrospinning and pyrolysis and then prepared CPE by in situ cationic polymerization of 1,3dioxolane to obtain poly (1,3-dioxolane) in the selfsupporting LLTO NF framework (Figure 3F). 94 The in situ formed CPE is attached to the mechanical supporting frame, and its thickness is greatly reduced (~10 μm) (Figure 3G). This structure enables the CPE-based LiFePO 4 (LFP) full battery to cycle stably for 350 cycles at a current density of 0.5 C at RT.…”

Section: Active Filler Network With Random Structurementioning

confidence: 99%

Designing mechanically reinforced filler network for thin and robust composite polymer electrolyte

Cheng,

Wang,

2023

Battery Energy

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Developing novel solid electrolytes with high performance is of great significance for the practical application of lithium metal batteries. Among all the developed solid electrolytes, composite polymer electrolytes (CPEs) have been deemed one of the most viable candidates because of their comprehensive performance. Nevertheless, the random distribution of inorganic filler nanoparticles may cause discontinuities in ion transport and low mechanical strength. Therefore, the introduction of a filler network with fast ion conduction is an effective strategy to provide continuous ion transport and mechanical support. The mechanically reinforced filler network enhances the mechanical strength of the CPE, providing opportunities to reduce the thickness of CPE. In this review, the progress of mechanically reinforced filler structures in CPE is summarized, along with the introduction of mechanically reinforced filler networks with random and ordered structures and electrode‐integrated CPE with mechanically reinforced filler networks. Finally, challenges and possible future research directions for mechanically reinforced filler network CPE are presented.

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In situconstruction of polyether-based composite electrolyte with bi-phase ion conductivity and stable electrolyte/electrode interphase for solid-state lithium metal batteries

Abstract: Polyether-based composite electrolytes exhibit great promises to bridge the gap between solid polymer electrolytes (SPEs) and high-energy solid-state Li metal batteries. However, the practical application is still hindered by the...

Cited by 25 publications

References 41 publications

Inorganic Filler Enhanced Formation of Stable Inorganic‐Rich Solid Electrolyte Interphase for High Performance Lithium Metal Batteries

Inorganic Filler Enhanced Formation of Stable Inorganic‐Rich Solid Electrolyte Interphase for High Performance Lithium Metal Batteries

A Fluorinated‐Polyimide‐Based Composite Nanofibrous Separator with Homogenized Pore Size for Wide‐Temperature Lithium Metal Batteries

Designing mechanically reinforced filler network for thin and robust composite polymer electrolyte

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