Improvement of the EC Performance in LCP-MOF Electrode Materials by Succinic Anhydrate Addition to the Electrolyte

The optimization of the electrolyte composition for a canonical cathode such as LiCoPO4 olivine. The implemented succinic anhydride within a liquid electrolyte LiPF6 and dissolved in carbonate/diethyl considerably improves the discharge capacity of the electrode are shown. The introduction of succinic anhydride into the solid/electrolyte interphase (SEI) layer is responsible for the improved electrochemical performance of the electrode. We used LiCoPO4@C-ZrO2 as a cathode to prove the concept. The observed results could be applied for a wide range of cathodes. Moreover, the proposed additive to the electrolyte could help evaluate the performance of the materials without the side effects of the electrolyte.

Download Full-text

Probing the Na metal solid electrolyte interphase via cryo-transmission electron microscopy

Nature Communications ◽

10.1038/s41467-021-23368-6 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Bing Han ◽

Yucheng Zou ◽

Zhen Zhang ◽

Xuming Yang ◽

Xiaobo Shi ◽

...

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Solid Electrolyte ◽

Solid Electrolyte Interphase ◽

Metal Electrode ◽

Liquid Electrolyte ◽

Battery Materials ◽

Cryogenic Transmission Electron Microscopy ◽

Transmission Electron ◽

Fluoroethylene Carbonate

AbstractCryogenic transmission electron microscopy (cryo-TEM) is a valuable tool recently proposed to investigate battery electrodes. Despite being employed for Li-based battery materials, cryo-TEM measurements for Na-based electrochemical energy storage systems are not commonly reported. In particular, elucidating the chemical and morphological behavior of the Na-metal electrode in contact with a non-aqueous liquid electrolyte solution could provide useful insights that may lead to a better understanding of metal cells during operation. Here, using cryo-TEM, we investigate the effect of fluoroethylene carbonate (FEC) additive on the solid electrolyte interphase (SEI) structure of a Na-metal electrode. Without FEC, the NaPF6-containing carbonate-based electrolyte reacts with the metal electrode to produce an unstable SEI, rich in Na2CO3 and Na3PO4, which constantly consumes the sodium reservoir of the cell during cycling. When FEC is used, the Na-metal electrode forms a multilayer SEI structure comprising an outer NaF-rich amorphous phase and an inner Na3PO4 phase. This layered structure stabilizes the SEI and prevents further reactions between the electrolyte and the Na metal.

Download Full-text

Surface-enhanced Raman spectroscopy (SERS): a powerful technique to study the SEI layer in batteries

Chemical Communications ◽

10.1039/d0cc08001b ◽

2021 ◽

Author(s):

M. J. Piernas-Muñoz ◽

A. Tornheim ◽

S. Trask ◽

Z. Zhang ◽

I. Bloom

Keyword(s):

Raman Spectroscopy ◽

Solid Electrolyte ◽

Solid Electrolyte Interphase ◽

Surface Enhanced Raman Spectroscopy ◽

Silicon Anode ◽

Powerful Technique ◽

Sei Layer ◽

Surface Enhanced ◽

Surface Enhanced Raman

The solid electrolyte interphase (SEI) layer on a silicon anode is investigated by SERS.

Download Full-text

Direct Visualization of the Solid Electrolyte Interphase and Its Effects on Silicon Electrochemical Performance

Advanced Materials Interfaces ◽

10.1002/admi.201600438 ◽

2016 ◽

Vol 3 (20) ◽

pp. 1600438 ◽

Cited By ~ 26

Author(s):

Mahsa Sina ◽

Judith Alvarado ◽

Hitoshi Shobukawa ◽

Caleb Alexander ◽

Viacheslav Manichev ◽

...

Keyword(s):

Electrochemical Performance ◽

Solid Electrolyte ◽

Solid Electrolyte Interphase ◽

Direct Visualization

Download Full-text

Capacity losses due to solid electrolyte interphase formation and sodium diffusion in sodium-ion batteries

10.21203/rs.3.rs-623903/v1 ◽

2021 ◽

Author(s):

Le Anh Ma ◽

Alexander Buckel ◽

Leif Nyholm ◽

Reza Younesi

Keyword(s):

Carbon Black ◽

Solid Electrolyte ◽

Solid Electrolyte Interphase ◽

Open Circuit ◽

Sodium Ion ◽

Sodium Ion Batteries ◽

Electrochemical Testing ◽

Capacity Loss ◽

Sei Layer ◽

Sodium Diffusion

Abstract Knowledge about capacity losses due to the formation and dissolution of the solid electrolyte interphase (SEI) layer in sodium-ion batteries (SIBs) is still limited. One major challenge in SIBs is the fact that the SEI generally contains more soluble species than the corresponding SEI layers formed in Li-ion batteries. By cycling carbon black electrodes against Na-metal electrodes, to mimic the SEI formation on negative SIB electrodes, this study studies the associated capacity losses in different carbonate electrolyte systems. Using electrochemical testing and synchrotron-based X-ray photoelectron (XPS) experiments, the capacity losses due to changes in the SEI layer and diffusion of sodium in the carbon black electrodes during open circuit pauses of 50 h, 30 h, 15 h and 5 h are investigated in nine different electrolyte systems. The different contributions to the open circuit capacity loss were determined using a new approach involving different galvanostatic cycling protocols. It is shown that the capacity loss depends on the interplay between the electrolyte chemistry and the thickness and stability of the SEI layer. The results show, that the Na-diffusion into the bulk electrode gives rise to a larger capacity loss than the SEI dissolution. Hence, Na-trapping effect is one of the major contribution in the observed capacity losses. Furthermore, the SEI formed in NaPF6-EC:DEC was found to become slightly thicker during 50 h pause, due to self-diffused deintercalation of Na from the carbon black structure coupled by further electrolyte reduction. On the other hand, the SEI in NaTFSI with the same solvent goes into dissolution during pause. The highest SEI dissolution rate and capacity loss was observed in NaPF6-EC:DEC (0.57 μAh/hpause) and the lowest in NaTFSI-EC:DME (0.15 μAh/hpause).

Download Full-text

The role of the solid electrolyte interphase layer in preventing Li dendrite growth in solid-state batteries

Energy & Environmental Science ◽

10.1039/c8ee00540k ◽

2018 ◽

Vol 11 (7) ◽

pp. 1803-1810 ◽

Cited By ~ 131

Author(s):

Bingbin Wu ◽

Shanyu Wang ◽

Joshua Lochala ◽

David Desrochers ◽

Bo Liu ◽

...

Keyword(s):

Solid State ◽

Solid Electrolyte ◽

Solid Electrolyte Interphase ◽

Dendrite Growth ◽

Interphase Layer ◽

Sei Layer ◽

Solid State Batteries

The fundamental role of the solid electrolyte interphase (SEI) layer in preventing dendritic Li growth has been investigated in solid-state batteries.

Download Full-text

A Theoretical Study of Growth of Solid-Electrolyte-Interphase Films in Lithium-Ion Batteries with Organosilicon Compounds

MRS Advances ◽

10.1557/adv.2019.78 ◽

2019 ◽

Vol 4 (14) ◽

pp. 801-806 ◽

Cited By ~ 2

Author(s):

Suguru Ueda ◽

Kumpei Yamada ◽

Kaoru Konno ◽

Minoru Hoshino ◽

Katsunori Kojima ◽

...

Keyword(s):

Solid Electrolyte ◽

Organic Liquid ◽

Solid Electrolyte Interphase ◽

Structural Evolution ◽

Lithium Ion ◽

Liquid Electrolyte ◽

Cycle Performance ◽

Anode Surface ◽

Decomposition Products ◽

Sei Film

ABSTRACTWe attempt to reveal how electrolyte additives affect the structural evolution of the solid electrolyte interphase (SEI) film on the anode surface of a lithium-ion secondary battery. Employing the hybrid Monte-Carlo/molecular-dynamics method, we theoretically investigate the SEI film structures in organic liquid-electrolyte systems with and without an organosilicon additive. The results show that the excessive growth of the SEI film is suppressed by introducing the organosilicon additives. It is further elucidated that the decomposition products of the organosilicon molecules are stably aggregated in the vicinity of the anode surface, and protect the electrolyte solvents and the lithium salts from the further reductive decomposition. These findings imply that the organosilicon additive possibly improves the cycle performance of LIBs owing to the formation of the effective SEI film.

Download Full-text