Customizing a Li–metal battery that survives practical operating conditions for electric vehicle applications

Hwang, Jang Yeon; Park, Seong Jin; Yoon, Chong Seung; Sun, Yang Kook

doi:10.1039/c9ee00716d

Cited by 136 publications

(109 citation statements)

References 39 publications

(34 reference statements)

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“…The similar electrochemical performance might be due to the Li capacity being excessive for cathode capacity (Supplementary Table 5). The ultrathin Li could also be applied in other HED batteries with a Li metal anode and Ni-rich Li(Ni x Co y Mn 1 − x − y )O 2 cathode, possibly providing new perspectives for the development of high-performance Li metal batteries 38,39 .…”

Section: Resultsmentioning

confidence: 99%

Tuning wettability of molten lithium via a chemical strategy for lithium metal anodes

et al. 2019

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Metallic lithium affords the highest theoretical capacity and lowest electrochemical potential and is viewed as a leading contender as an anode for high-energy-density rechargeable batteries. However, the poor wettability of molten lithium does not allow it to spread across the surface of lithiophobic substrates, hindering the production and application of this anode. Here we report a general chemical strategy to overcome this dilemma by reacting molten lithium with functional organic coatings or elemental additives. The Gibbs formation energy and newly formed chemical bonds are found to be the governing factor for the wetting behavior. As a result of the improved wettability, a series of ultrathin lithium of 10–20 μm thick is obtained together with impressive electrochemical performance in lithium metal batteries. These findings provide an overall guide for tuning the wettability of molten lithium and offer an affordable strategy for the large-scale production of ultrathin lithium, and could be further extended to other alkali metals, such as sodium and potassium.

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Section: Resultsmentioning

confidence: 99%

Tuning wettability of molten lithium via a chemical strategy for lithium metal anodes

et al. 2019

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“…Electrolyte engineering, including using fluorinated solvents, high‐concentration electrolytes, additives, and so on, is an effective and widely studied route to improve Li‐ion flux via modifying the structure of in situ formed SEI on the Li metal. [ 11–15 ] For example, with fluoroethylene carbonate as an additive, the SEI appears to have a multilayer structure, which improves battery performance. [ 16 ] Building an artificial protective layer is another way to improve the distribution of composites in the SEI, provide fast Li‐ion diffusion, and increase mechanical strength.…”

Section: Figurementioning

confidence: 99%

Redistributing Li‐Ion Flux by Parallelly Aligned Holey Nanosheets for Dendrite‐Free Li Metal Anodes

et al. 2020

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Li metal is the most ideal anode material to assemble rechargeable batteries with high energy density. However, nonuniform Li‐ion flux during repeated Li plating and stripping leads to continuous Li dendrite growth and dead Li formation, which causes safety risks and short lifetime and thus impedes the commercialization of Li metal batteries. Here, parallelly aligned holey nanosheets on a Li metal anode are reported to simultaneously redistribute the Li‐ion flux in the electrolyte and in the solid‐electrolyte interphase, which allows uniform Li‐ion distribution as well as fast Li‐ion diffusion for reversible Li plating and stripping. With holey MgO nanosheets as an example, the protected Li anodes achieve Coulombic efficiency of ≈99% and ultralong‐term reversible Li plating/stripping over 2500 h at a high current density of 10 mA cm−2. A full‐cell battery, using the protected anode, a 4 V Li‐ion cathode, and a commercial carbonate electrolyte, shows capacity retention of 90.9% after 500 cycles.

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“…To enable wider and faster adoption of lithium ion batteries (LIBs) in applications such as electric vehicles, the challenge of maintaining high energy density at high current (high power) must be overcome. [1][2][3] A typical LIB cell comprises electrodes coated on metallic foil pieces (current collectors) that are stacked alternately (anode-cathode-anode-, etc.) with ion permeable porous separators in-between and wetted using a lithium (Li) ion containing liquid electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Low-tortuosity and graded lithium ion battery cathodes by ice templating

et al. 2019

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Customizing a Li–metal battery that survives practical operating conditions for electric vehicle applications

Abstract: We customized a combination of cathode, anode, and electrolyte to develop an LMB capable of cycling both at a high loading capacity and at a high current density that satisfy the capacity and charging rate requirements for future electric vehicles.

Cited by 136 publications

References 39 publications

Tuning wettability of molten lithium via a chemical strategy for lithium metal anodes

Tuning wettability of molten lithium via a chemical strategy for lithium metal anodes

Redistributing Li‐Ion Flux by Parallelly Aligned Holey Nanosheets for Dendrite‐Free Li Metal Anodes

Low-tortuosity and graded lithium ion battery cathodes by ice templating

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