Key Issues Hindering a Practical Lithium-Metal Anode

Fang, Chengcheng; Wang, Xuefeng; Meng, Ying Shirley

doi:10.1016/j.trechm.2019.02.015

Cited by 374 publications

(313 citation statements)

References 49 publications

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“…The development of electric vehicles demands Li ion batteries with higher energy density . Among all the possible anode materials for the next generation of batteries, Li metal is regarded as the ultimate choice owing to its ultrahigh specific capacity and negative redox potential . However, its practical application is severely hindered by the problems of uncontrollable dendrite growth, low Coulombic efficiency (CE) and Li metal deactivation during the electrochemical plating and stripping process .…”

Section: Introductionmentioning

confidence: 99%

“…Among all the possible anode materials for the next generation of batteries, Li metal is regarded as the ultimate choice owing to its ultrahigh specific capacity and negative redox potential . However, its practical application is severely hindered by the problems of uncontrollable dendrite growth, low Coulombic efficiency (CE) and Li metal deactivation during the electrochemical plating and stripping process . Strategies such as electrolyte engineering, artificial solid electrolyte interphase (SEI), structured electrodes, and separator membrane modification, have been demonstrated to be effective in alleviating these issues via regulation of Li ion transport and/or interfacial properties …”

Section: Introductionmentioning

confidence: 99%

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Metal Organic Framework Derivative Improving Lithium Metal Anode Cycling

Zhong

Lin

Wang

et al. 2020

Adv Funct Materials

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This work demonstrates a new approach in using metal organic framework (MOF) materials to improve Li metal batteries, a burgeoning rechargeable battery technology. Instead of using the MIL‐125‐Ti MOF structure directly, the material is decomposed into intimately‐mixed amorphous titanium dioxide and crystalline terephthalic acid. The resulting composite material outperforms the oxide alone, the organic component alone, and the parent MOF in suppressing Li dendrite growth and extending cycle life of Li metal electrodes. Coated on a commercial polypropylene separator, this material induces the formation of a desirable solid electrolyte interphase layer comprising mechanically flexible organic species and ionically conductive lithium nitride species, which in turn leads to Li||Cu and Li||Li cells that can stably operate for hundreds of charging–discharging cycles. In addition, this material strongly adsorbs lithium polysulfides and can also benefit the cathode of lithium–sulfur batteries.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metal Organic Framework Derivative Improving Lithium Metal Anode Cycling

Zhong

Lin

Wang

et al. 2020

Adv Funct Materials

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“…Though the porosity is certainly higher at 6 than at 1 mA cm −2 , using SAW produces far better deposition behavior. Again, the top view images support this conclusion, with substantial porosity and dendrites in the cell without SAW (Figure 2k,l) and homogeneous “chunked” morphology with SAW (Figure 2p) known to result from homogeneous current distribution during deposition 28…”

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confidence: 53%

Enabling Rapid Charging Lithium Metal Batteries via Surface Acoustic Wave‐Driven Electrolyte Flow

et al. 2020

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Both powerful and unstable, practical lithium metal batteries have remained a difficult challenge for over 50 years. With severe ion depletion gradients in the electrolyte during charging, they rapidly develop porosity, dendrites, and dead Li that cause poor performance and, all too often, spectacular failure. Remarkably, incorporating a small, 100 MHz surface acoustic wave device (SAW) solves this problem. Providing acoustic streaming electrolyte flow during charging, the device enables dense Li plating and avoids porosity and dendrites. SAW‐integrated Li cells can operate up to 6 mA cm−2 in a commercial carbonate‐based electrolyte; omitting the SAW leads to short circuiting at 2 mA cm−2. The Li deposition is morphologically dendrite‐free and close to theoretical density when cycling with the SAW. With a 245 µm thick Li anode in a full Li||LFP (LiFePO4) cell, introducing the SAW increases the uncycled Li from 145 to 225 µm, decreasing Li consumption from 41% to only 8%. A closed‐form model is provided to explain the phenomena and serve as a design tool for integrating this chemistry‐agnostic approach into batteries whatever the chemistry within.

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“…Significant advances in characterizations are helping researchers get unprecedentedly close to truly understand the LMB working and failure mechanisms . Nevertheless, basic questions on the Li dendrites and SEI still remain.…”

Section: Figurementioning

confidence: 99%

“…It is suggested that the minimization of SEI formation is necessary when using high-surface-area 3D current collectors.Significant advances in characterizations are helping researchers get unprecedentedly close to truly understand the LMB working and failure mechanisms. [12] Nevertheless, basic questions on the Li dendrites and SEI still remain. For instance, how are the SEI-covering Li dendrites formed and what is the role of SEI during Li dendrite formation?…”

mentioning

confidence: 99%