A nonflammable low-concentration electrolyte for lithium-ion batteries

Hu, Guorong; Peng, Zhongdong; Yanbing, Cao; Wu, Jiahui; Huang, Min; Zhang, Shuai; Dai, Yuqing; Gong, Yifan; Guan, Dichang

doi:10.1039/d2ta01760a

Cited by 21 publications

(17 citation statements)

References 37 publications

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“…In our recent work, we reported a low-concentration electrolyte containing 0.4 M LiPF 6 in the ternary mixtures of EC, dimethyl carbonate (DMC), and 1,1,2,2-tetrafluoroethyl-2,2,3,3tetrafluoropropyl ether (TTE). [14] We proved that the presence of TTE in the low-concentration electrolyte can change the Li + -solvation structure prominently. The unique solution structure leads to enhanced oxidation stability of the low-concentration electrolyte and conduces to forming a LiF-rich SEI on the cathode.…”

Section: Introductionmentioning

confidence: 72%

“…In our recent work, we reported a low‐concentration electrolyte containing 0.4 M LiPF 6 in the ternary mixtures of EC, dimethyl carbonate (DMC), and 1,1,2,2‐tetrafluoroethyl‐2,2,3,3‐tetrafluoropropyl ether (TTE) [14] . We proved that the presence of TTE in the low‐concentration electrolyte can change the Li + ‐solvation structure prominently.…”

Section: Introductionmentioning

confidence: 78%

“…TTE (or HFE) was used to regulate the solution structure of the LCPEs just like we did before. [14] It is unprecedented to achieve good compatibility between lowconcentration PC-based electrolytes and graphite anodes, which provides new guidelines for developing PC-based electrolytes based on the Li + -solvation structure for graphite anodes.…”

Section: Introductionmentioning

confidence: 99%

“…Inspired by this, we exploited a series of LCPEs containing only 0.5 M LiPF 6 in a mixture of PC and TTE or 1,1,2,2‐Tetrafluoroethyl‐2,2,2‐trifluoroethyl ether (HFE) with different volume ratios. TTE (or HFE) was used to regulate the solution structure of the LCPEs just like we did before [14] . It is unprecedented to achieve good compatibility between low‐concentration PC‐based electrolytes and graphite anodes, which provides new guidelines for developing PC‐based electrolytes based on the Li + ‐solvation structure for graphite anodes.…”

Section: Introductionmentioning

confidence: 99%

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Designing Low‐Concentration Propylene Carbonate‐based Electrolyte by Manipulating Lithium⁺‐Solvation Structure for Graphite Anode

Guan

Peng

et al. 2022

Batteries & Supercaps

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We systematically study the correlation between Li+‐solvation structure, interfacial stability, and electrochemical behavior in the system of graphite anode with low‐concentration (0.5 M) propylene carbonate (PC)‐based electrolyte (LCPE). 1,1,2,2‐tetrafluoroethyl‐2,2,3,3‐tetrafluoropropylether (TTE) [or 1,1,2,2‐tetrafluoroethyl‐2,2,2‐trifluoroethyl ether (HFE)] is used to manipulate the solvation structures of Li+ in the LCPEs. Varying Li+‐solvation structures are realized by changing the volume ratios of PC to TTE (or HFE) in the LCPEs. With the increase of TTE (or HFE) dosages, the relative contents of LiF and LixPOyFz in SEI derived from normalPnormalF6- increase, while the decomposition products of PC reduce. With enough TTE (or HFE) in the LCPE, the Li||graphite cell exhibits reversible (de)lithiation without PC co‐intercalation and continuous electrolyte decomposition due to the shield of a compact SEI rich in LiF and LixPOyFz. Our work proves it is practicable to achieve LiF‐riched SEIs on graphite anodes and realize reversible (de)lithiation in LCPEs by regulating the Li+‐solvation structures with inert cosolvents.

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Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Designing Low‐Concentration Propylene Carbonate‐based Electrolyte by Manipulating Lithium⁺‐Solvation Structure for Graphite Anode

Guan

Peng

et al. 2022

Batteries & Supercaps

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“…Meanwhile, the fluorinated aromatic diluents pairing with anions has been proposed as a new class of cosolvents for high-concentration electrolytes of consisting of a mixture of lithium bis(fluorosulfonyl)imide (LiFSI), 1,2-dimethoxyethane (DME) (Zhu et al, 2022). This, the anion-diluent pairing's improved compatibility with the reactive Ni-rich electrodes, enables an 80% capacity retention of a 20 μm thin Li/high-loading-NCM811 (3.5 mAh cm −2 ) cell for 260 cycles at a cut-off charging voltage of 4.3 V. Not long ago, 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) has also been demonstrated as an inert cosolvent to develop a nonflammable low concentration electrolyte for Graphite/ NCM523 pouch cells (Guan et al, 2022). This case casts a new insight into the development of LIB electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Fluorinated co-solvent electrolytes for high-voltage Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) positive electrodes

et al. 2022

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Nickel-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) is one of the most promising positive electrodes for utilization in the next-generation of lithium-ion batteries. Charging the NCM cells above 4.3 V is proposed to be beneficial for its reversible capacity. However, the high reactivity of the NCM811 usually results in parasitic electrolyte degradation, which is accelerated with the increase of the Ni content in the NCM positive electrodes, leading to the thickening of the positive electrode-electrolyte interphase during cycling. Herein, to counter this issue, we select partially fluorinated solvents, such as methyl 3,3,3-trifluoropropanoate (MTFP) and 1,1,1,2,2,3,3,4,4-nonafluoro-4-methoxybutane (NFMB), as a co-solvent for fluoroethylene carbonate (FEC)-based electrolytes, and detailed investigate theirs physical, chemical, and electrochemical properties for applications in NCM811 materials. Compared to the carbonate-based electrolyte without a fluorinated solvent, the electrolytes with a fluorinated co-solvent display an obviously enhanced cycling performance of the Li/NCM811 cells charged to above 4.5 V. This work suggests that fluorinated co-solvent electrolytes provide an alternative way to the high-concentration electrolyte for the design of new electrolyte systems for high energy density lithium-ion batteries.

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Does Salt Concentration Matter? New Insights on the Intercalation Behavior of PF6−${\rm{PF}}_6^ - $ into Graphite Cathode for the Dual‐Ion Battery

Guan

Wang

Chen³

et al. 2023

Adv Funct Materials

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A high-concentration electrolyte is favored in dual-ion batteries (DIBs) due to the lower onset potential for anion intercalation, higher specific discharge capacity, and better oxidation stability. Inspired by the correlation between the high-concentration electrolytes and localized high-concentration electrolytes, it is suspected that it is not the salt concentration but the solution structure of the electrolyte that determines the intercalation behavior of anion into graphite cathode. To prove the viewpoint, a series of electrolytes are prepared by controlling the salt concentration or solution structure and the intercalation behavior of PF 6 − within the graphite cathode is investigated in Li||graphite and graphite||graphite cells. It is found that PF 6 − anions exhibit similar onset potentials and specific discharge capacities in the electrolytes with different salt concentrations but similar solution structures. This study provides a new perspective on designing promising electrolytes for DIBs, which can accelerate the further exploitation of high-performance DIBs.

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A nonflammable low-concentration electrolyte for lithium-ion batteries

Abstract: In this work, we develop a nonflammable low-concentration electrolyte (LCE) based on the Li+-solvation sheath structure. It consists of only 0.4M LiPF6 in the mixture of ethylene carbonate (EC), dimethyl...

Cited by 21 publications

References 37 publications

Designing Low‐Concentration Propylene Carbonate‐based Electrolyte by Manipulating Lithium⁺‐Solvation Structure for Graphite Anode

Designing Low‐Concentration Propylene Carbonate‐based Electrolyte by Manipulating Lithium⁺‐Solvation Structure for Graphite Anode

Fluorinated co-solvent electrolytes for high-voltage Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) positive electrodes

Does Salt Concentration Matter? New Insights on the Intercalation Behavior of PF6−${\rm{PF}}_6^ - $ into Graphite Cathode for the Dual‐Ion Battery

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A nonflammable low-concentration electrolyte for lithium-ion batteries

Abstract: In this work, we develop a nonflammable low-concentration electrolyte (LCE) based on the Li+-solvation sheath structure. It consists of only 0.4M LiPF6 in the mixture of ethylene carbonate (EC), dimethyl...

Cited by 21 publications

References 37 publications

Designing Low‐Concentration Propylene Carbonate‐based Electrolyte by Manipulating Lithium+‐Solvation Structure for Graphite Anode

Designing Low‐Concentration Propylene Carbonate‐based Electrolyte by Manipulating Lithium+‐Solvation Structure for Graphite Anode

Fluorinated co-solvent electrolytes for high-voltage Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811) positive electrodes

Does Salt Concentration Matter? New Insights on the Intercalation Behavior of PF6−${\rm{PF}}_6^ - $ into Graphite Cathode for the Dual‐Ion Battery

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About

Designing Low‐Concentration Propylene Carbonate‐based Electrolyte by Manipulating Lithium⁺‐Solvation Structure for Graphite Anode

Designing Low‐Concentration Propylene Carbonate‐based Electrolyte by Manipulating Lithium⁺‐Solvation Structure for Graphite Anode