A polymeric separator membrane with chemoresistance and high Li-ion flux for high-energy-density lithium metal batteries

Ryu, Jaegeon; Han, Dong‐Yeob; Hong, Dongki; Park, Soo‐Jin

doi:10.1016/j.ensm.2021.12.046

Cited by 51 publications

(33 citation statements)

References 57 publications

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“…As a comparison, the F-PPTA@PP separator delivers an initial capacity a high initial capacity of 84.8 mAh g -1 with a capacity attenuation of 51% and a stable CE of 99% after 300 cycles at 30 C. The cycling performance of the F-PPTA@PP separator was given in a comprehensive comparison (cycling number, attenuation rate, current density and materials loading) to other recent separators employed in LMBs (Table S7, Supporting Information). [19,[63][64][65][66][67][68][69][70][71][72][73][74] Compared with other similarly reported separators collocated with NCM811 cathodes, the F-PPTA@PP separator delivers the longest cycle time (1000 cycles) at 0.5 C, synchronously enabling the slowest capacity attenuation (0.02% per cycle) (Figure 6e). Noticeably, the F-PPTA@PP separator still presents the best cycle performance at the highest C rate (30 C) with an acceptable capacity attenuation (0.06% per cycle).…”

Section: Resultsmentioning

confidence: 99%

Thermally Stable and Dendrite‐Resistant Separators toward Highly Robust Lithium Metal Batteries

Sun

Wang

Chen

et al. 2022

Advanced Energy Materials

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Metallic lithium (Li) has been considered as an attractive anode material for next-generation rechargeable batteries, owing to its high theoretical capacity (3860 mAh g -1 ), low redox potential (−3.040 V vs standard hydrogen electrode), and low density (0.59 g cm -3 ). [4][5] Nevertheless, the high activity of Li metal, nonuniform Li plating, large volume change, and the formation of fragile solid electrolyte interphase (SEI) layer in lithium metal batteries (LMBs) inevitably lead to negative effects of the low Coulombic efficiency (CE), the uncontrollable growth of Li dendrite, the formation of "dead" Li, etc. [6][7][8][9] These intractable problems can cause irreversible loss of Li metal and electrolyte, resulting in a sustaining capacity attenuation or even triggering thermal runaway and explosion of the battery. Thermal runaway-induced accidents should be a wakeup call that people need to focus more attention on the battery safety and avoid undesirable energy release during battery cycling, since the batteries with higher energy density always endure lower thermal stability during operation. [10][11][12] Consequently, it is of vital importance to achieve robust LMBs security in the progress of developing Li metal anode and constantly breaking the bottleneck of energy density.As a critical component in batteries, separator not only provides paths for Li ion transfer, but also prevents accidental contact of anode and cathode. [13] According to statistics, at least 90% of various battery abuses (e.g., mechanical-abuse, electrical-abuse, thermal-abuse, and electrochemical-abuse) are related to internal short circuits caused by the failure of separator. [14] The prominent weak point of conventional polyolefin separators is their low melting point (135 °C for polyethylene (PE) separator and 165 °C for polypropylene (PP) separator), [15] which means they can easily shrink and collapse upon thermalabuse. To address this issue, tremendous efforts have been devoted to designing thermal-safety separators. [16] Metal oxides with polar surfaces (e.g., SiO 2 and Al 2 O 3 ) have been commonly reported as protective layers to enhance the thermal resistance of polyolefin separator. [17] Some inorganic materials with high Li-ion, thermal conductivity or flame retardance (e.g.,

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Section: Resultsmentioning

confidence: 99%

Thermally Stable and Dendrite‐Resistant Separators toward Highly Robust Lithium Metal Batteries

Sun

Wang

Chen

et al. 2022

Advanced Energy Materials

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“…Separators with a ferroelectric coating layer also benefit to accelerate Li ion migration. [194] A ferroelectric decoration layer of BiFeO 3 (BFO) nanoparticles on the routine separator can reduce the diffusion energy barrier of Li ions and the ferroelectric polarization induced electric field ensures a high Li-ion diffusion coefficient, thus providing adequate Li ions at the anode surface. [195] The modified separator with a high Li-ion transfer number contributes to the preferred orientations of Li deposition with well-defined textures, and endows stable columnar Li plating to a high capacity of 20 mAh cm −2 .…”

Section: Modification Of Separatorsmentioning

confidence: 99%

Working Principles of Lithium Metal Anode in Pouch Cells

Sun

Cheng

et al. 2022

Advanced Energy Materials

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Advanced energy storage technology represented by lithium (Li)-ion batteries (LIBs) has revolutionized human life in recent years. The energy density of LIBs based on intercalation chemistry is approaching its theoretical limit after unremitting efforts for the past three decades. The state-of-the-art LIBs with graphite anode can only achieve an energy density lower than 300 Wh kg −1 . [1] This cannot satisfy the increasing demands for portable electronic devices, electric vehicles, and stationary energy storage systems. [2] Therefore, it is urgently called for next-generation batteries with a high energy density, long lifespan, and high safety performance. [3,4] Electrode material is of great importance in determining the energy density of batteries. [5] As the holy grail anode, Li metal possesses the ultrahigh theoretical specific capacity (3860 mAh g −1 ) and low potential (−3.04 V vs the standard hydrogen electrode). The promising feature renders Li metal anode to be an indispensable candidate for constructing next-generation high-energy-density batteries. [6] A high energy density of 400 or even 500 Wh kg −1 can be achieved with Li metal batteries (LMBs) matching Ni-rich LiNi x Co y Mn (1−x−y) O 2 (0 < x, y <1), oxygen, or sulfur cathodes, etc. [7][8][9] However, the conversion chemistry and high reactivity of Li metal also bring great challenges to the design of robust LMBs with long lifespan and high safety. [10,11] Specifically, Li dendrite growth and infinite volume variation lead to unstable solid electrolyte interphase (SEI) on Li metal anodes, resulting in low Li utilization, capacity decline, and even safety risk, [12] severely hindering the practical applications of LMBs. [13][14][15] Recently, extensive strategies have been exploited to control the dendrite growth of Li metal anodes, including engineering electrolytes and additives, [16] designing 3D host structures, [17][18][19] constructing artificial SEI, [20,21] applying solid-state electrolyte (SSE), [22][23][24] and adjusting operation conditions. [25] A high Coulombic efficiency (>99.9%) and long lifespan (>1000 cycles) have been reported in the materials-level coin cells. [26][27][28] Notably, Li dendrite growth is primarily driven by the kinetical limitation of Li-ion diffusion near the electrolyte/electrode interface. Serious dendrite issues can be encountered under harsh operating conditions in pouch cells, considering the accelerated consumption of Li ions at large currents and high Lithium metal battery has been considered as one of the potential candidates for next-generation energy storage systems. However, the dendrite growth issue in Li anodes results in low practical energy density, short lifespan, and poor safety performance. The strategies in suppressing Li dendrite growth are mostly conducted in materials-level coin cells, while their validity in device-level pouch cells is still under debate. It is imperative to address dendrite issues in pouch cells to realize the practical application of Li metal batteries. This review prese...

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“…Moreover, the tail, assigned to the degradation of anions (at 683.0 eV) observed in the Cu-Li, was dramatically reduced in the Cu@SPF-Li, implying to preserve the Li salt concentration and alleviating the solvent decomposition along with a stable SEI layer throughout the anode architecture by the dual-functional 3D host. [46,47]…”

Section: Space-filling Effect Of Spf On LI Electrodepositionmentioning

confidence: 99%

Dual‐Functional Stacked Polymer Fibers for Stable Lithium Metal Batteries in Carbonate‐Based Electrolytes

et al. 2022

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Lithium (Li) metal has long been thought to be an ideal anode material for high‐energy‐density Li metal batteries (LMBs). Nonetheless, a variety of safety risks and short cycle life due to uncontrollable Li dendrite growth limit its practical application. Here, a novel polymer‐based 3D host composed of stacked polymer fibers (SPF) is purposefully designed using a simple electrospinning method to achieve dual‐functional properties that endow bottom‐up Li filling and morphologically regulate Li metal deposition over the host structure. As a result, the SPF allows for uniform Li‐ion flux in the electrode, leading to densely packed Li deposition and further stable cycling in conventional carbonate‐based electrolytes. Besides, a full cell paired with LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode results in a high‐energy‐density battery with a low negative/positive capacity ratio and a wide operating temperature range. This study presents a rational design for improving the stability and safety of Li metal anodes in conventional carbonate‐based electrolytes for advanced LMBs.

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A polymeric separator membrane with chemoresistance and high Li-ion flux for high-energy-density lithium metal batteries

Cited by 51 publications

References 57 publications

Thermally Stable and Dendrite‐Resistant Separators toward Highly Robust Lithium Metal Batteries

Thermally Stable and Dendrite‐Resistant Separators toward Highly Robust Lithium Metal Batteries

Working Principles of Lithium Metal Anode in Pouch Cells

Dual‐Functional Stacked Polymer Fibers for Stable Lithium Metal Batteries in Carbonate‐Based Electrolytes

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