Mechanism of high-concentration electrolyte inhibiting the destructive effect of Mn(II) on the performance of lithium-ion batteries

Cui, Xiaoling; Sun, Jing; Zhao, Dongni; Zhang, Jingjing; Wang, Jie; Dong, Hong; Wang, Peng; Zhang, Junwei; Wu, Shumin; Song, Linhu; Zhang, Ningshuang; Li, Chunlei; Li, Shiyou

doi:10.1016/j.jechem.2022.12.008

Cited by 11 publications

(13 citation statements)

References 49 publications

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“…As reported, a stable SEI is established as a prerequisite for realizing the practical application of silicon-based anode cells. − Thus, various types of electrolyte additives which are usually able to preferentially form stable SEI on the anode surface before the decomposition of electrolyte body are used in Si-based LIBs. , It is reported that additives of fluoroethylene carbonate (FEC), vinyl carbonate (VC), (pentafluorophenyl)borane (TPFPB), lithium bis(oxalate)borate (LiBOB), and lithium difluorobisoxalate phosphate (LiDFBOP) have shown positive effects on improving the cycle life of Si-based anodes. − FEC has once been considered as the most promising additive because its reduction products are mainly composed of polyolefins and LiF, and its derived SEI has characteristics of flexibility and high ionic conductivity. However, FEC will decompose at high temperature to generate gaseous products, especially HF, which is very destructive to cycling and safety performances .…”

Section: Introductionmentioning

confidence: 99%

Building a Flexible and Highly Ionic Conductive Solid Electrolyte Interphase on the Surface of Si@C Anodes by Binary Electrolyte Additives

Song,

Li,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Si@C as a high specific capacity anode material for lithium batteries (LIBs) has attracted a lot of attention. However, the severe volume change during lithium de-embedding causes repeated rupture/reconstruction of the solid electrolyte interphase (SEI), resulting in poor cycling stability of the Si-based battery system and thus hindering its application in commercial batteries. Using electrolyte additives to form an excellent SEI is considered to be a cost-effective method to meet this challenge. Here, the classical film-forming additive vinyl carbonate (VC), and the newly emerging lithium salt additive lithium difluorophosphate (LiDFP), are chosen as synergistic additives to improve the electrode–electrolyte interface properties. Final results show that the VC additive generates flexible polycarbonate components at the electrode/electrolyte interface, preventing the fragmentation of Si particles. However, the organic components show high impedance, inhibiting the fast transport of Li+. This defect can be supplemented from the decomposition substances of the LiDFP additive. The derived inorganic products, such as LiF and Li3PO4, can strengthen the reaction kinetics of the electrode, reduce the interfacial impedance, and promote the Li+ transport. Thus, the synergistic effect of VC and LiDFP additives builds an effective SEI with good flexibility and high ionic conductivity and then significantly improves the cycling and rate stability of Si@C anodes. The experimental results show that the utilization of LiDFP and VC additives to modify the Si@C anode interface enhances the capacity retention of the Si@C/Li half-cell after 100 cycles from 68.2% to 85.1%. Besides, the possible mechanism of action between VC and LiDFP is proposed by using the spectral characterization technique and density functional theory (DFT) calculations. This research opens up a new possibility for improvement of SEI, and provides a simple way to achieve high-performance Si-based LIBs.

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Section: Introductionmentioning

confidence: 99%

Building a Flexible and Highly Ionic Conductive Solid Electrolyte Interphase on the Surface of Si@C Anodes by Binary Electrolyte Additives

Song,

Li,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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“…Due to the uncertain types of organic solvents (different manufacturers and the generation of new compounds), it seems to be not practical and economically viable to further separate the single composition in organic solvents (Figure ). Although it has been reported that it can achieve the separation of different organic solvents based on their boiling points or compatibilities, the separation effect was not satisfying, and meanwhile, lead to the high consumption of energy and new chemicals. , Due to the high-grade lithium salts in the electrolyte, the separation and recovery of lithium salts have attracted more attention from the economic benefits. ,− Accordingly, this section will mainly discuss recent studies on lithium salts recovery.…”

Section: Progress and Challenges For Recycling Electrolytementioning

confidence: 99%

Recycling Hazardous and Valuable Electrolyte in Spent Lithium-Ion Batteries: Urgency, Progress, Challenge, and Viable Approach

Niu

Xiao

et al. 2023

Chem. Rev.

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Recycling spent lithium-ion batteries (LIBs) is becoming a hot global issue due to the huge amount of scrap, hazardous, and valuable materials associated with end-of-life LIBs. The electrolyte, accounting for 10–15 wt % of spent LIBs, is the most hazardous substance involved in recycling spent LIBs. Meanwhile, the valuable components, especially Li-based salts, make recycling economically beneficial. However, studies of electrolyte recycling still account for only a small fraction of the number of spent LIB recycling papers. On the other hand, many more studies about electrolyte recycling have been published in Chinese but are not well-known worldwide due to the limitations of language. To build a bridge between Chinese and Western academic achievements on electrolyte treatments, this Review first illustrates the urgency and importance of electrolyte recycling and analyzes the reason for its neglect. Then, we introduce the principles and processes of the electrolyte collection methods including mechanical processing, distillation and freezing, solvent extraction, and supercritical carbon dioxide. We also discuss electrolyte separation and regeneration with an emphasis on methods for recovering lithium salts. We discuss the advantages, disadvantages, and challenges of recycling processes. Moreover, we propose five viable approaches for industrialized applications to efficiently recycle electrolytes that combine different processing steps, ranging from mechanical processing with heat distillation to mechanochemistry and in situ catalysis, and to discharging and supercritical carbon dioxide extraction. We conclude with a discussion of future directions for electrolyte recycling. This Review will contribute to electrolyte recycling more efficiently, environmentally friendly, and economically.

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“…[20] Finally, anions coordinated with lithium ions preferentially decompose to form stable and dense SEI. [21] Nevertheless, anions in normal electrolyte will be pushed to the OHP and the solvent molecules near the electrode preferentially decompose to form SEI. [22] According to reports, enriched inorganic SEI, particularly fluorides and nitrides, are advantageous for enhancing structural stability and facilitating ions' transport.…”

Section: Correlation Of Sei and Edlmentioning

confidence: 99%

“…Lithium salt of high‐concentration electrolytes strengthens the coordination between the anions and Li + , effectively stabilizing the solvent molecules [20] . Finally, anions coordinated with lithium ions preferentially decompose to form stable and dense SEI [21] . Nevertheless, anions in normal electrolyte will be pushed to the OHP and the solvent molecules near the electrode preferentially decompose to form SEI [22] …”

Section: Introductionmentioning

confidence: 99%

Interface Regulation via Electric Double Layer for Rechargeable Batteries

Du,

Song,

Yang

et al. 2023

ChemSusChem

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Interface, especially the electrochemically formed solid electrolyte interphase (SEI), is significantly important for cycling stability, reaction kinetics and safety of rechargeable batteries. The structure and composition of the electric double layer (EDL) greatly affect the formation of SEI and the performance of electrodes. However, as far as we know, there isn’t review to demonstrate the theme specially. Herein, the recent substantial progress for EDL and its impact on the formation of SEI in rechargeable batteries are reviewed and discussed. Firstly, the specific adsorption of electrolyte components on electrodes’ surface and the ionic solvation structure is introduced. Furthermore, various methods for controlling EDL in different electrode systems are described. Finally, the future development of SEI via EDL is presented for improvements and breakthroughs in electrochemical performance of rechargeable batteries.

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Mechanism of high-concentration electrolyte inhibiting the destructive effect of Mn(II) on the performance of lithium-ion batteries

Cited by 11 publications

References 49 publications

Building a Flexible and Highly Ionic Conductive Solid Electrolyte Interphase on the Surface of Si@C Anodes by Binary Electrolyte Additives

Building a Flexible and Highly Ionic Conductive Solid Electrolyte Interphase on the Surface of Si@C Anodes by Binary Electrolyte Additives

Recycling Hazardous and Valuable Electrolyte in Spent Lithium-Ion Batteries: Urgency, Progress, Challenge, and Viable Approach

Interface Regulation via Electric Double Layer for Rechargeable Batteries

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