scholarly journals Photochemically driven solid electrolyte interphase for extremely fast-charging lithium-ion batteries

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Minsung Baek ◽  
Jinyoung Kim ◽  
Jaegyu Jin ◽  
Jang Wook Choi
Keyword(s):  
Solid Electrolyte ◽  
Solid Electrolyte Interphase ◽  
Lithium Ion ◽  
Battery Cell ◽  
Charging Infrastructure ◽  
Sei Layer ◽  
Fast Charging ◽  
Γ Ray ◽  
Battery Technology ◽  
Two Parameters

AbstractExtremely fast charging (i.e. 80% of storage capacity within 15 min) is a pressing requirement for current lithium-ion battery technology and also affects the planning of charging infrastructure. Accelerating lithium ion transport through the solid-electrolyte interphase (SEI) is a major obstacle in boosting charging rate; in turn, limited kinetics at the SEI layer negatively affect the cycle life and battery safety as a result of lithium metal plating on the electrode surface. Here, we report a γ-ray-driven SEI layer that allows a battery cell to be charged to 80% capacity in 10.8 min as determined for a graphite full-cell with a capacity of 2.6 mAh cm−2. This exceptional charging performance is attributed to the lithium fluoride-rich SEI induced by salt-dominant decomposition via γ-ray irradiation. This study highlights the potential of non-electrochemical approaches to adjust the SEI composition toward fast charging and long-term stability, two parameters that are difficult to improve simultaneously in typical electrochemical processes owing to the trade-off relation.

scholarly journals Improving the cyclability performance of lithium-ion batteries by introducing lithium difluorophosphate (LiPO2F2) additive

RSC Advances ◽  
2017 ◽  
Vol 7 (42) ◽  
pp. 26052-26059 ◽  
Author(s):  
Guanghua Yang ◽  
Junli Shi ◽  
Cai Shen ◽  
Shuwei Wang ◽  
Lan Xia ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Lithium Ion Batteries ◽  
Solid Electrolyte Interphase ◽  
Lithium Ion ◽  
Sei Layer

The cyclability of lithium-ion batteries (LIBs) is often affected by the components of the solid electrolyte interphase (SEI) layer which is generated from electrochemical decomposition of electrolyte.

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

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.

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

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).

scholarly journals Facile synthesis of NASICON-type Li1.3Al0.3Ti1.7(PO4)3 solid electrolyte and its application for enhanced cyclic performance in lithium ion batteries through the introduction of an artificial Li3PO4 SEI layer

RSC Advances ◽  
2017 ◽  
Vol 7 (74) ◽  
pp. 46545-46552 ◽  
Author(s):  
Jianyu Liu ◽  
Tao Liu ◽  
Yujie Pu ◽  
Mingming Guan ◽  
Zhiyuan Tang ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Cycle Stability ◽  
Cyclic Performance ◽  
Facile Synthesis ◽  
Sei Layer ◽  
Nasicon Type ◽  
Molten Flux

Li1.3Al0.3Ti1.7(PO4)3 powder was synthesized with CO(NH2)2 as a molten flux and Li3PO4 SEI layer was used to improve cycle stability of the battery.

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