The surface modification of electrode materials using gel polymer electrolytes for anode-free lithium metal batteries (AFLMB)

Redda, Haylay Ghidey; Nikodimos, Yosef; Su, Wei‐Nien; Chen, Ruei-San; Hagos, Teklay Mezgebe; Bezabh, Hailemariam Kassa; Weldeyohannes, Haile Hisho; Hwang, Bing‐Joe

doi:10.1016/j.mtener.2022.101141

Cited by 4 publications

(2 citation statements)

References 42 publications

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“…Fillers including a lithium-ion conductor (Li 7 La 3 Zr 2 O 12 , Li 2 Al 0.5 Ti 0.5 (PO 4 ) 3 , Li 10 GeP 2 S 12 ) and inert fillers (Al 2 O 3 , SiO 2 , TiO 2 , ZrO 2 ) have been widely used in polymer electrolytes. − Among them, inexpensive and air-stable inert fillers hold promise for industry applications. It has been recognized that the improvement in the polymer battery performance after adding inert fillers is mainly due to the increase in ionic conductivity. − However, the conduction of lithium ions in GPE is thought to be similar to that in conventional liquid electrolytes rather than along the polymer chains.…”

Section: Introductionmentioning

confidence: 99%

Inert Filler Selection Strategies in Li-Ion Gel Polymer Electrolytes

Zhao

Yao

et al. 2023

ACS Appl. Mater. Interfaces

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The main role of inert fillers in polymer electrolytes is to enhance ionic conductivity. However, lithium ions in gel polymer electrolytes (GPEs) conduct in liquid solvent rather than along the polymer chains. So far, the main role of inert fillers in improving the electrochemical performance of GPEs is still unclear. Here, various low-cost and common inert fillers (Al2O3, SiO2, TiO2, ZrO2) are introduced into GPEs to study their effects on Li-ion polymer batteries. It is found that the addition of inert fillers has different effects on ionic conductivity, mechanical strength, thermal stability, and, dominantly, interfacial properties. Compared with other gel electrolytes containing SiO2, TiO2, or ZrO2 fillers, those with Al2O3 fillers exhibit the most favorable performance. The high performance is ascribed to the interaction between the surface functional groups of Al2O3 and LiNi0.8Co0.1Mn0.1O2, which alleviates the decomposition of the organic solvent by the cathode, resulting in the formation of a high-quality Li+ conductor interfacial layer. This study provides an important reference for the selection of fillers in GPEs, surface modification of separators, and cathode surface coating.

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Section: Introductionmentioning

confidence: 99%

Inert Filler Selection Strategies in Li-Ion Gel Polymer Electrolytes

Zhao

Yao

et al. 2023

ACS Appl. Mater. Interfaces

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“…[15][16][17][18][19][20] Gel polymer electrolyte (GPE) as the intermediate state between liquid electrolyte and solid-state electrolyte is expected to have both functional interphase and high ionic conductivity at 25 °C for satisfactory high-performance lithium metal battery. [21][22][23] But in GPE, polymer matrix with high crystallinity usually limits the inter-movement of the chain segments and results in weak mechanical properties with reduced porosity. [24][25][26] These disadvantages are opposite to the transfer of Li ions (Li + ).…”

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confidence: 99%

Three-Dimensional Porous Structural Polyvinylidene Fluoride-Blending Ethylene Carbonate and MIL-125 (Ti) Composite Membrane-Based Gel Polymer Electrolyte for Lithium Metal Battery

Fu,

Li,

Huang

et al. 2023

J. Electrochem. Soc.

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Lithium metal batteries are considered promising contenders for the next generation of high energy density batteries. However, lithium metal anode with inhomogeneous lithium deposition in liquid electrolyte causes the uncontrolled growth of lithium dendrites. Owing to the high dielectric constant, thermal stability and electromechanical stability of polyvinylidene fluoride, we design a novel gel polymer electrolyte consisting of porous polyvinylidene fluoride polymer matrix, liquid electrolyte, ethylene carbonate and MIL-125 (Ti) (Ti8O8(OH)4(BDC)6, BDC = 1,4-benzene dicarboxylate) for facilitating Li+ transfer and alleviating the growth of lithium dendrites. The high dielectric constant environment facilitates the dissociation of Li+, and the porous polymer matrix structure accommodates more Li+ for fast transfer. Ethylene carbonate reduces the crystallinity of the polymer matrix and improves the ionic conductivity. MIL-125 (Ti) nanoparticles with surface area and uniform micropores improve toughness for enhancing mechanical property, and synergistically promote the Li+ transfer for building stable interfacial phase to alleviate the growth of Li dendrites. Therefore, the gel polymer electrolyte has high ionic conductivity of ∼1.50 × 10−3 S cm−1 at 25 °C, and quasi-solid-state Li/LiFePO4 battery has high discharge capacity of 153.5 mAh g−1 after 250 cycles at 25 °C and 0.3 C.

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