Lithium deposition mechanism on Si and Cu substrates in the carbonate electrolyte

Sun, Junqiang; Peng, Jiaying; Ring, Terry A.; Whittaker‐Brooks, Luisa; Zhu, Juner; Fraggedakis, Dimitrios; Niu, Jin; Gao, Tao; Wang, Feng

doi:10.1039/d2ee01833k

Cited by 46 publications

(18 citation statements)

References 68 publications

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“…The ionic conductivity of polymer electrolyte-Si@SiO x , which contains 30 μL of liquid electrolyte (5.5 × 10 –5 S cm –1 ) at room temperature, is comparable to that of the polymer electrolyte containing 30 μL of liquid electrolyte (4.9 × 10 –5 S cm –1 ) (Figure a). The calculation method of ionic conductivity is presented in Table S1 (Supporting Information). − Moreover, the electrochemical windows of polymer electrolyte-Si@SiO x and the polymer electrolyte are similar (above 5.1 V), as observed by using linear sweep voltammetry (LSV). This suggests that the Si@SiO x layer does not affect the electrochemical window (Figure b), which could be ascribed to its nonreactivity with the polymer electrolyte and no impact on the structure of the polymer electrolyte.…”

Section: Resultsmentioning

confidence: 70%

Silicon Layer on Polymer Electrolyte as a Dendrite Stopper for Stable Lithium Metal Batteries

Zhao,

Du,

et al. 2023

ACS Appl. Energy Mater.

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Silicon (Si) is a promising candidate for nextgeneration anode materials because of its high specific capacity of 3579 mAh g −1 and low potential of 0.4 V (vs Li + /Li). However, the development of Si anode has been limited by the huge volume expansion during the lithiation process. Here, a layer of core−shell Si@SiO x nanoparticles is coated on one surface of the polymer electrolyte as a dendrite stopper by taking advantage of the high specific capacity of Si, and the negative effects of Si volume expansion can be offset by the flexibility of the polymer electrolyte. The Si@SiO x layer is employed to match the lithium metal anode for suppressing the growth of lithium dendrites. When lithium dendrites are in contact with the Si@SiO x layer, the Si@SiO x nanoparticles can react with lithium ions deposited on the contact interface to form a Li−Si alloy (Li y Si), which can reduce the concentration of lithium ions at the sharp ends of lithium dendrites, thus inhibiting the further growth of lithium dendrites. As a result, symmetric Li//Li cells can maintain stability without lithium dendrites for more than 2600 h. This study presents a promising approach to address the dendrite issue in solid-state lithium metal batteries.

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Section: Resultsmentioning

confidence: 70%

Silicon Layer on Polymer Electrolyte as a Dendrite Stopper for Stable Lithium Metal Batteries

Zhao,

Du,

et al. 2023

ACS Appl. Energy Mater.

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“…The location of Li nucleation is governed by the diffusion and migration of Li‐ions. [ 24 ] Consequently, manipulating the pathways of Li‐ion migration serves as an advantageous strategy to control directed nucleation. For the electrode of ASCF, dual‐mode driven Li‐ions flow steadily from Ag to Ag 2 S and nucleate on the Ag 2 S side within the nucleation voltage window.…”

Section: Resultsmentioning

confidence: 99%

A Protection Route Based on the Dual‐Mode Transfer of Lithium Ions for Lithiophilic Site during the Nucleation Period

Zhu,

Cui,

Wang

et al. 2023

Advanced Energy Materials

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Lithiophilic sites with high binding energy to lithium have a positive effect on the induction of Li deposition. However, saturation deposition of Li‐ions on lithiophilic sites causes a loss of lithiophilicity. Herein, a protection route of lithiophilic sites during the nucleation period is proposed for the first time. The designed heterointerface provides a directional built‐in electric field and a lithiophilic potential well. Li‐ions in the space field can nucleate on the semiconductor side by crossing metal‐based lithiophilic sites through the electric field‐driven mode and the chemical field‐driven mode. Based on a high‐efficiency dual‐mode transfer pathway for Li‐ions, which ensures continuous exposure of lithiophilic sites to the electric field and maximizes its positive effect during the nucleation period. A full cell utilizing the LiFePO4 cathode exhibits a stable voltage profile with low polarization for over 200 cycles at 1 C, demonstrating the importance of the continued role of the lithiophilic sites. This work provides a new direction to design lithiophilic sites in Li metal batteries, which can be extended to other alkali metal batteries.

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“…(3) The Li electrode in an organic liquid electrolyte also leads to serious safety issues, such as electrolyte leakage, gas formation and even explosion. [17][18][19][20] Solid electrolytes, including inorganic solid electrolytes and solid polymer electrolytes, have been considered as more promising candidates to inhibit the Li dendrite growth and address the safety issues of LMBs. [21][22][23][24][25] Generally, an ideal solid electrolyte should possess high ionic conductivity, good mechanical strength, and an intimate electrode/electrolyte interface.…”

Section: Introductionmentioning

confidence: 99%

“…(3) The Li electrode in an organic liquid electrolyte also leads to serious safety issues, such as electrolyte leakage, gas formation and even explosion. 17–20…”

Section: Introductionmentioning

confidence: 99%

Fiber-reinforced quasi-solid polymer electrolytes enabling stable Li-metal batteries

Gao

Zhang

et al. 2023

Mater. Adv.

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Lithium deposition mechanism on Si and Cu substrates in the carbonate electrolyte

Abstract: Electrochemical Li deposition occurs in fast-charging Li-ion batteries and Li metal batteries. The morphologies of the Li deposits govern the reversibility of the deposition/stripping reaction, and affect the tendency of...

Cited by 46 publications

References 68 publications

Silicon Layer on Polymer Electrolyte as a Dendrite Stopper for Stable Lithium Metal Batteries

Silicon Layer on Polymer Electrolyte as a Dendrite Stopper for Stable Lithium Metal Batteries

A Protection Route Based on the Dual‐Mode Transfer of Lithium Ions for Lithiophilic Site during the Nucleation Period

Fiber-reinforced quasi-solid polymer electrolytes enabling stable Li-metal batteries

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