Composite Solid Electrolytes: Facilitating Interfacial Stability Via Bilayer Heterostructure Solid Electrolyte Toward High‐energy, Safe and Adaptable Lithium Batteries (Adv. Energy Mater. 31/2020)

Sun, Jianqi; Yao, Xiangming; Li, Yaogang; Zhang, Qinghong; Hou, Chengyi; Shi, Qiuwei; Wang, Hongzhi

doi:10.1002/aenm.202070131

Cited by 38 publications

(27 citation statements)

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“…To confirm the phase of the PVDF‐HFP hosts, the X‐ray diffraction (XRD) patterns were obtained and shown in Figure 2 a. Characteristic peaks around 18°, 20°, and 40° are detected, which indicates that the PVDF‐HFP matrix includes α‐phase PVDF‐HFP [44] . The position of each diffraction peak does not change but its intensity decreases, which demonstrates the increase of amorphous region after mixing with the bis(trifluoromethane)sulfonimide lithium (LiTFSI).…”

Section: Resultsmentioning

confidence: 99%

“…The interfacial layer formed on Li anode mainly consisted of LiF, Li 2 CO 3 , LiOH and sulfur compounds, mainly attributed to the interfacial reaction between TFSI − and Li metal. This multicomponent interface layer delivered promising ionic conductivity, excellent electronic insulation, and good mechanical property, which should be responsible for the suppressed side reactions and sustainable lithium plating/stripping [44, 54] …”

Section: Resultsmentioning

confidence: 99%

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Designing Polymer‐in‐Salt Electrolyte and Fully Infiltrated 3D Electrode for Integrated Solid‐State Lithium Batteries

Liu

et al. 2021

Angewandte Chemie

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Solid-state lithium batteries (SSLBs) are promising owing to enhanced safety and high energy density but plagued by the relatively low ionic conductivity of solid-state electrolytes and large electrolyte-electrode interfacial resistance. Herein, we design a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)-based polymer-in-salt solid electrolyte (PISSE) with high room-temperature ionic conductivity (1.24 10 À4 S cm À1 ) and construct a model integrated TiO 2 /Li SSLB with 3D fully infiltration of solid electrolyte. With forming aggregated ion clusters, unique ionic channels are generated in the PISSE, providing much faster Li + transport than common polymer electrolytes. The integrated device achieves maximized interfacial contact and electrochemical and mechanical stability, with performance close to liquid electrolyte. A pouch cell made of 2 SSLB units in series shows high voltage plateau (3.7 V) and volumetric energy density comparable to many commercial thin-film batteries.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Designing Polymer‐in‐Salt Electrolyte and Fully Infiltrated 3D Electrode for Integrated Solid‐State Lithium Batteries

Liu

et al. 2021

Angewandte Chemie

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“…As shown in Figure S13a−c, the peaks at 286.57 eV (C−O), 290.07 eV (OC−O), and 291.55 eV (CO 3 2− ) can be observed in the C 1s spectrum for the liquid electrolyte, which is ascribed to the decomposition of the liquid electrolyte for the formation of the SEI layer during cell cycling. 50,51 The peaks of the F 1s spectrum at 684.64 and 688.60 eV correspond to LiF and −CF 3 , respectively. Besides, a characteristic peak attributed to Li 2 S appears at 162.70 eV in the S 2p spectrum.…”

Section: Resultsmentioning

confidence: 99%

“…Besides, a characteristic peak attributed to Li 2 S appears at 162.70 eV in the S 2p spectrum. Particularly, LiF is considered as an essential component for the formation of a stable SEI, while the detection of −CF 3 and Li 2 S on the surface of the cycled Li foil from the Li/liquid electrolyte/LFP cell suggests the reduction of lithium salt. , It is reported that Li 2 S originating from lithium salt reduction is one of the unsuitable components in the improvement of electrochemical properties for the formed SEI layer because of its poor ion transport capacity and interface compatibility . As for the Li/PEO-35 wt % Li SPE/LFP cell, it is also hard to achieve a stable interface layer during long cycling according to the obtained XPS data.…”

Section: Resultsmentioning

confidence: 99%

Application of a Modified Porphyrin in a Polymer Electrolyte with Superior Properties for All-Solid-State Lithium Batteries

Zeng

Chen

et al. 2021

ACS Appl. Mater. Interfaces

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Porphyrins and their derivatives are a unique class of multifunctional and modifiable π-conjugated heterocyclic organic molecules, which have been widely applied in the fields of optoelectronic devices and catalysis. However, the application of porphyrins in polymer electrolytes for all-solid-state lithium-ion batteries (ASSLIBs) has rarely been reported. Herein, porphyrin molecules modified by polyether chains are used for composite solid-state polymer electrolytes (CSPEs) for the first time. The introduction of a modified porphyrin in an electrolyte can not only promote the electrochemical properties by constructing ordered ion channels via the intermolecular interaction between π-conjugated heterocyclic porphyrins, but also significantly improve the mechanical strength and interface contact between the electrolyte membrane and the lithium metal anode. Consequently, the all-solid-state batteries assembled by the modified porphyrin composite polymer electrolyte, LiFePO 4 cathodes, and Li anodes deliver a higher discharge capacity of 158.2 mA h g −1 at 60 °C, 0.2 C, which remains at 153.6 mA h g −1 after 120 cycles with an average coulombic efficiency of ∼99.60%. Furthermore, the flexible porphyrin-based composite polymer electrolyte can also enable a Li || LiCoO 2 battery to exhibit a maximum discharge capacity of 108.6 mA h g −1 at 60 °C, 0.1 C with an active material loading of 2−3 mg cm −2 , which is unable to realize for the corresponding batteries with a pure PEO-based polymer electrolyte. This work not only broadens the application scope of porphyrins, but also proposes a novel method to fabricate CSPEs with improved electrochemical and mechanical properties, which may shed new light on the development of CSPEs for next-generation high-energy-density lithium-ion batteries.

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“…Efforts to enhance the solid contact interface have been focused on adding a trace of liquid electrolytes at the interface, constructing a thin artificial alloy interface with high wettability, or designing ceramic–polymer composite electrolytes that could possess both the advantages of ceramic and polymer electrolytes. [ 17–28 ] For instance, adding extra Li–Al, Li–Si, Li–Au, Li–ZnO, and Li–C/Ag alloy interface layers could improve the wettability of the SSE surface and facilitated rapid Li + ‐transportation at the interface. [ 17–22 ] These delicate interfaces were more compatible with Li‐metal to boost Li‐nucleation.…”

Section: Introductionmentioning

confidence: 99%

Solid‐State Lithium Metal Batteries with Extended Cycling Enabled by Dynamic Adaptive Solid‐State Interfaces

Liu

Zhao

et al. 2021

Advanced Materials

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Improving the long-term cycling stability of solid-state lithium (Li)-metal batteries (SSBs) is a severe challenge because of the notorious solid-solid interfacial contact loss originating from the repeated expansion and contraction of the Li anodes. Here, it is reported that high-performance SSBs are enabled by constructing brick-and-mortar electrolytes that can dynamically adapt to the interface changes during cycling. An electrolyte film with a high mechanical strain (250%) is fabricated by filling viscoelastic (600% strain) and piezoelectric block-copolymer electrolytes (mortar) into a mixed conductor Li 0.33 La 0.56 TiO 3-x nanofiber film (brick). During Li-plating, the electrolytes can homogenize the interfacial electric field and generate piezoelectricity to promote uniform Li-deposition, while the mortar can adhere to the Li-anode without interfacial disintegration in the reversed Li-stripping. As a result, the electrolytes show excellent compatibility with the electrodes, leading to a long electrochemical cyclability at room temperature. The symmetrical Li//Li cells run stably for 1880 h without forming dendrites, and the LiFePO 4 /Li full batteries deliver high coulombic efficiency (>99.5%) and capacity retention (>85%) over 550 cycles. More practically, the pouch cells exhibit excellent flexibility and safety for potential practical applications.

show abstract

Composite Solid Electrolytes: Facilitating Interfacial Stability Via Bilayer Heterostructure Solid Electrolyte Toward High‐energy, Safe and Adaptable Lithium Batteries (Adv. Energy Mater. 31/2020)

Cited by 38 publications

References 0 publications

Designing Polymer‐in‐Salt Electrolyte and Fully Infiltrated 3D Electrode for Integrated Solid‐State Lithium Batteries

Designing Polymer‐in‐Salt Electrolyte and Fully Infiltrated 3D Electrode for Integrated Solid‐State Lithium Batteries

Application of a Modified Porphyrin in a Polymer Electrolyte with Superior Properties for All-Solid-State Lithium Batteries

Solid‐State Lithium Metal Batteries with Extended Cycling Enabled by Dynamic Adaptive Solid‐State Interfaces

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