A high strength hybrid separator with fast ionic conductor for dendrite-free lithium metal batteries

Mao, Yuqiong; Sun, Wang; Qiao, Yaoxuan; Liu, Xin; Chen, Xu; Li, Fang; Hou, Wenshuo; Wang, Zhenhua; Sun, Kening

doi:10.1016/j.cej.2021.129119

Cited by 44 publications

(19 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, it is an efficient and straightforward strategy to control the morphology and growing orientation of Li dendrite. Typically, the coating materials to functionalize the surface of polymer separators can be classified into five or six types: (a) thermally conductive materials [ 63 , 64 , 69 , 94 , 95 , 96 , 97 , 98 ], (b) metals [ 99 , 100 , 101 , 102 ], (c) polymers [ 103 , 104 , 105 , 106 , 107 , 108 ], (d) carbons [ 66 , 109 , 110 , 111 ], (e) metal oxides [ 67 , 88 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 ], and (f) others [ 120 , 121 , 122 , 123 , 124 ] ( Figure 3 ). For electrochemical evaluation, each separator coating material is laminated onto one side or both sides of the polymer separator, using the tape-casting method, physical vapor deposition, etc.…”

Section: Approaches To Modify the Surface Of Conventional Polymer Separators For Lmbsmentioning

confidence: 99%

“…Different from the previous approach, there is another attempt to use solid-state electrolytes as separator-coating materials. For instance, Sun et al designed a hybrid separator using Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 (LLZTO) and aramid nanofibers via a simple casting method ( Figure 9 a) [ 120 ]. The prepared separator possesses an excellent mechanical stability as well as high thermal stability.…”

Section: Approaches To Modify the Surface Of Conventional Polymer Separators For Lmbsmentioning

confidence: 99%

“…( a ) Schematics to show the benefits of PLHS-coated separators in terms of thermal shrinkage and electrochemical performance. (Reproduced with permission from [ 120 ], Copyright 2021 Elsevier B.V.) ( b ) The structure and electrochemical benefits of LLZTO-coated separator for LMBs. The distribution of Li-ion concentration is modeled as a graph.…”

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

Surface-Functionalized Separator for Stable and Reliable Lithium Metal Batteries: A Review

Kim

2021

Nanomaterials

View full text Add to dashboard Cite

Metallic Li has caught the attention of researchers studying future anodes for next-generation batteries, owing to its attractive properties: high theoretical capacity, highly negative standard potential, and very low density. However, inevitable issues, such as inhomogeneous Li deposition/dissolution and poor Coulombic efficiency, hinder the pragmatic use of Li anodes for commercial rechargeable batteries. As one of viable strategies, the surface functionalization of polymer separators has recently drawn significant attention from industries and academics to tackle the inherent issues of metallic Li anodes. In this article, separator-coating materials are classified into five or six categories to give a general guideline for fabricating functional separators compatible with post-lithium-ion batteries. The overall research trends and outlook for surface-functionalized separators are reviewed.

show abstract

Section: Approaches To Modify the Surface Of Conventional Polymer Separators For Lmbsmentioning

confidence: 99%

Section: Approaches To Modify the Surface Of Conventional Polymer Separators For Lmbsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

See 1 more Smart Citation

Surface-Functionalized Separator for Stable and Reliable Lithium Metal Batteries: A Review

Kim

2021

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…LIB separators are supposed to possess high mechanical properties that can withstand the high tension from cell assembly and the growth of lithium dendrites formed during prolonged cycling (Mao et al 2021). The tensile strength and modulus of the membranes were surveyed via the tensile test.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Aramid Nanofibers Reinforced Cellulose Paper-Based Lithium-Ion Battery Separator with Improved Safety and Cycling Stability

Zhang

Luo

et al. 2021

Preprint

View full text Add to dashboard Cite

Commercial polyolefin separators with poor electrolyte wettability and inferior thermal stability have hampered the development of advanced lithium-ion batteries (LIBs) due to their unsatisfied electrochemical performance and severe safety hazards. Herein, a novel paper-based composite separator composed of electrolyte-affinitive cellulose fibers (CFs) and thermally stable aramid nanofibers (ANFs) was successfully fabricated through the traditional papermaking method. It was found that the incorporation of ANFs played crucial roles in improving the defects of pure CF separator such as large-sized pores, low mechanical strength and high flammability. Specifically, the CF/ANF composite separator with 20 wt.% ANFs (CF/ANF-20) possessed narrow micropores, satisfied tensile strength (33MPa), excellent thermal resistance (without dimensional shrinkage up to 200 °C) and flame retardancy, greatly enhancing the safe operation of battery. In addition, benefiting from the highly porous structure and exceptional electrolyte affinity of CF separator, the CF/ANF-20 composite separator exhibited appropriate porosity and superior electrolyte wettability, which brought about a high electrolyte uptake (157%), thus endowing it with better ionic conductivity (0.75 mS cm−1) and lower interfacial resistance than that of commercial polypropylene (PP) separator. Accordingly, the LiFePO4/Li half cells using CF/ANF-20 separator delivered outstanding rate capability and stable cycling performance. All results indicate that the CF/ANF-20 separator with great balance between the electrochemical performance and safety is an intriguing candidate for advanced LIBs.

show abstract

“…The energy density of batteries is increasingly high to meet the future requirements of wider and further applications. However, security issues become more rigorous for batteries with high energy density, typified by lithium metal batteries. − The liquid electrolyte is the principal cause of security problems in lithium batteries because of its inherent defects, such as high volatility, flammability, and leakage. − Moreover, to ensure fast transmission of lithium ions and consumption in the long-term cycling process, the amount of the used liquid electrolyte should be relatively large, which decreases the energy density of the lithium battery. A solid polymer electrolyte (SPE) is highly desired to improve both the energy density and the safety of lithium batteries because of its various advantages including light weight, thin thickness, low flammability, no leakage of electrolytes, good viscoelasticity, and good interfacial contact with the electrodes. − In addition, the portable devices and wearable electronics are gaining popularity, which demands rapid development of flexible batteries, and polymer electrolytes can be one of the key components of flexible batteries. , Thus, the SPE is an inevitable direction and trend in the development of flexible batteries and even the whole secondary lithium batteries.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Solid-State Polymer Electrolyte Based on Highly Concentrated LiTFSI Complexing DMF for Ambient-Temperature Rechargeable Lithium Batteries

Sun

Hou

et al. 2022

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

Solid-state polymer electrolytes (SPEs) complexing a plasticizer is a valid strategy to improve the poor ionic conductivity of SPEs at ambient temperature. In this study, a quasi-SPE based on a polyurethane matrix (QSPE-PU) is constructed by regulating the contents of bis(trifluoromethanesulfonyl) imide (LiTFSI) salt and N,N-dimethylformamide (DMF) and shows high performance in ambient-temperature rechargeable lithium batteries. Highly concentrated LiTFSI is designed to anchor DMF, decreasing the free solvent molecules in the QSPE to improve the stability with lithium metal. Meanwhile, DMF can fully dissociate the highly concentrated LiTFSI, providing more carriers. The prepared QSPE-PU40 shows a high ionic conductivity of 1.12 × 10 −4 S cm −1 at ambient temperature since DMF not only provides more carriers but also enhances the movement of the polymer segments and lowers the energy barrier of lithium ion migration. Density functional theory calculations further prove that DMF facilitates the conduction of lithium ions in the QSPE system. QSPE-PU40 shows good compatibility with the lithium metal electrode by forming a stable solid electrolyte interphase during lithium plating/stripping processes. The lithium ferrophosphate (LFP)/QSPE-PU40/Li battery exhibits a high specific capacity of 138 mA h g −1 with remarkable cycling stability at 0.5 C and 30 °C (94% capacity retention after 800 cycles). More impressively, the pouch cell based on QSPE-PU40 delivers good flexibility and high safety. Such a QSPE is expected to provide an effective strategy where SPEs are applied in solid-state lithium batteries at ambient temperature and even flexible batteries for next-generation wearable devices.

show abstract

A high strength hybrid separator with fast ionic conductor for dendrite-free lithium metal batteries

Cited by 44 publications

References 52 publications

Surface-Functionalized Separator for Stable and Reliable Lithium Metal Batteries: A Review

Surface-Functionalized Separator for Stable and Reliable Lithium Metal Batteries: A Review

Aramid Nanofibers Reinforced Cellulose Paper-Based Lithium-Ion Battery Separator with Improved Safety and Cycling Stability

Quasi-Solid-State Polymer Electrolyte Based on Highly Concentrated LiTFSI Complexing DMF for Ambient-Temperature Rechargeable Lithium Batteries

Contact Info

Product

Resources

About