Porous insulating matrix for lithium metal anode with long cycling stability and high power

Xu, Bingqing; Zhai, Haowei; Liao, Xiangbiao; Qie, Boyu; Mandal, Jyotirmoy; Gong, Tianyao; Tan, Laiyuan; Yang, Xiujia; Sun, Kerui; Cheng, Qin; Chen, Meijie; Miao, Yupeng; Wei, Mian; Zhu, Bin; Fu, Yanke; Li, Aijun; Chen, Xi; Min, Wei; Nan, Ce‐Wen; Lin, Yuanhua; Yang, Yuan

doi:10.1016/j.ensm.2018.11.035

Cited by 41 publications

(32 citation statements)

References 37 publications

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“…[ 38,39 ] These dendrites can gradually penetrate the membrane in conventional Li‐ion batteries using liquid electrolytes, or evolve along the grain boundaries inside the solid‐state ones. [ 22,40,41 ] Once reaching the cathode, the dendrite can cause short circuit, induce thermal runaway, and quickly result in a major fire or explosion. [ 42,43 ]…”

Section: Figurementioning

confidence: 99%

Stamping Flexible Li Alloy Anodes

et al. 2021

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Li metal holds great promise to be the ultimate anode choice owing to its high specific capacity and low redox potential. However, processing Li metal into thin‐film anode with high electrochemical performance and good safety to match commercial cathodes remains challenging. Herein, a new method is reported to prepare ultrathin, flexible, and high‐performance Li–Sn alloy anodes with various shapes on a number of substrates by directly stamping a molten metal solution. The printed anode is as thin as 15 µm, corresponding to an areal capacity of ≈3 mAh cm–2 that matches most commercial cathode materials. The incorporation of Sn provides the nucleation center for Li, thereby mitigating Li dendrites as well as decreasing the overpotential during Li stripping/plating (e.g., <10 mV at 0.25 mA cm–2). As a proof‐of‐concept, a flexible Li‐ion battery using the ultrathin Li–Sn alloy anode and a commercial NMC cathode demonstrates good electrochemical performance and reliable cell operation even after repetitive deformation. The approach can be extended to other metal/alloy anodes such as Na, K, and Mg. This study opens a new door toward the future development of high‐performance ultrathin alloy‐based anodes for next‐generation batteries.

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Section: Figurementioning

confidence: 99%

Stamping Flexible Li Alloy Anodes

et al. 2021

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“…Alternatively, lithium–sulfur (Li‐S) batteries are an attractive option for next‐generation energy‐storage devices owing to their high energy density (2600 W h kg −1 ) . Metallic Li is known as a lightweight anode for advanced Li‐metal batteries because of its ultrahigh theoretical specific capacity (3860 mA h g −1 ), low reduction potential (−3.040 V), and low gravimetric density (0.534 g cm −3 ) . Therefore, metallic Li is considered as a promising anode material for high‐energy, rechargeable Li‐metal batteries, such as Li‐S batteries …”

mentioning

confidence: 99%

Long‐Life, High‐Rate Lithium–Sulfur Cells with a Carbon‐Free VN Host as an Efficient Polysulfide Adsorbent and Lithium Dendrite Inhibitor

Manthiram

2019

Advanced Energy Materials

155

104

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Lithium–sulfur (Li‐S) batteries are a promising next‐generation energy‐storage system, but the polysulfide shuttle and dendritic Li growth seriously hinder their commercial viability. Most of the previous studies have focused on only one of these two issues at a time. To address both the issues simultaneously, presented here is a highly conductive, noncarbon, 3D vanadium nitride (VN) nanowire array as an efficient host for both sulfur cathodes and lithium‐metal anodes. With fast electron and ion transport and high porosity and surface area, VN traps the soluble polysulfides, promotes the redox kinetics of sulfur cathodes, facilitates uniform nucleation/growth of lithium metal, and inhibits lithium dendrite growth at an unprecedented high current density of 10 mA cm−2 over 200 h of repeated plating/stripping. As a result, VN‐Li||VN‐S full cells constructed with VN as both an anode and cathode host with a negative to positive electrode capacity ratio of only ≈2 deliver remarkable electrochemical performance with a high Coulombic efficiency of ≈99.6% over 850 cycles at a high 4 C rate and a high areal capacity of 4.6 mA h cm−2. The strategy presented here offers a viable approach to realize high‐energy‐density, safe Li‐metal‐based batteries.

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“…After pressing, the volume of the porous PI separator decreased to ca. 1/80 from PI sponge, and the pore diameter significantly reduced to less than 1 μm, as shown in Figure 2 d. Furthermore, the networked open-cell porous structure was maintained as it was prepared, and these networked porous structures could effectively prevent the formation of vertically growing Li dendrites [ 37 ]. Because PI is physically and electrochemically stable, the porous PI separator was sufficiently applicable as a separator for Li-metal anodes.…”

Section: Resultsmentioning

confidence: 99%

Highly Stable Porous Polyimide Sponge as a Separator for Lithium-Metal Secondary Batteries

et al. 2020

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To inhibit Li-dendrite growth on lithium (Li)-metal electrodes, which causes capacity deterioration and safety issues in Li-ion batteries, we prepared a porous polyimide (PI) sponge using a solution-processable high internal-phase emulsion technique with a water-soluble PI precursor solution; the process is not only simple but also environmentally friendly. The prepared PI sponge was processed into porous PI separators and used for Li-metal electrodes. The physical properties (e.g., thermal stability, liquid electrolyte uptake, and ionic conductivity) of the porous PI separators and their effect on the Li-metal anodes (e.g., self-discharge and open-circuit voltage properties after storage, cycle performance, rate capability, and morphological changes) were investigated. Owing to the thermally stable properties of the PI polymer, the porous PI separators demonstrated no dimensional changes up to 180 °C. In comparison with commercialized polyethylene (PE) separators, the porous PI separators exhibited improved wetting ability for liquid electrolytes; thus, the latter improved not only the physical properties (e.g., improved the electrolyte uptake and ionic conductivity) but also the electrochemical properties of Li-metal electrodes (e.g., maintained stable self-discharge capacity and open-circuit voltage features after storage and improved the cycle performance and rate capability) in comparison with PE separators.

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Porous insulating matrix for lithium metal anode with long cycling stability and high power

Cited by 41 publications

References 37 publications

Stamping Flexible Li Alloy Anodes

Stamping Flexible Li Alloy Anodes

Long‐Life, High‐Rate Lithium–Sulfur Cells with a Carbon‐Free VN Host as an Efficient Polysulfide Adsorbent and Lithium Dendrite Inhibitor

Highly Stable Porous Polyimide Sponge as a Separator for Lithium-Metal Secondary Batteries

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