Ethylene‐Carbonate‐Free Electrolytes for Rechargeable Li‐Ion Pouch Cells at Sub‐Freezing Temperatures

Yao, Yuxing; Yao, Nan; Zhou, Xi; Li, Ze-Heng; Yue, Xin‐Yang; Yan, Chong; Zhang, Qiang

doi:10.1002/adma.202206448

Cited by 81 publications

(55 citation statements)

References 37 publications

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“…[1][2][3][4][5][6][7] To achieve more competitive battery technology, excellent high-power cycling, and low-temperature ionic conductivity, and slow Li + transport in SEI. [38][39][40] In addition, polymer electrolyte cannot spontaneously wet the whole electrodes, especially inside the porous cathode, which leads to a large interfacial resistance and deteriorates rapidly at low temperature. Effective solutions need to be proposed to address these fundamental failure mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Polyether‐b‐Amide Based Solid Electrolytes with Well‐Adhered Interface and Fast Kinetics for Ultralow Temperature Solid‐State Lithium Metal Batteries

Huang

Wang

et al. 2023

Adv Funct Materials

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Solid-state lithium metal batteries (SSLMBs) are highly desirable for energy storage because of the urgent need for higher energy density and safer batteries. However, it remains a critical challenge for stable cycling of SSLMBs at low temperature. Here, a highly viscoelastic polyether-b-amide (PEO-b-PA) based composite solid-state electrolyte is proposed through a one-pot melt processing without solvent to address this key process. By adjusting the molar ratio of PEO-b-PA to lithium bis(trifluoromethanesulphonyl)imide (ethylene oxide:Li = 6:1) and adding 20 wt.% succinonitrile, fast Li + transport channel is conducted within the homogeneous polymer electrolyte, which enables its application at ultra-low temperature (−20 to 25 °C). The composite solid-state electrolyte utilizes dynamic hydrogen-bonding domains and ionconducting domains to achieve a low interfacial charge transfer resistance (<600 Ω) at −20 °C and high ionic conductivity (25 °C, 3.7 × 10 −4 S cm −1 ). As a result, the LiFePO 4 |Li battery based on composite electrolyte exhibits outstanding electrochemical performance with 81.5% capacity retention after 1200 cycles at −20 °C and high discharge specific capacities of 141.1 mAh g −1 with high loading (16.1 mg cm −2 ) at 25 °C. Moreover, the solid-state SNCM811|Li cell achieves excellent safety performance under nail penetration test, showing great promise for practical application.

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Section: Introductionmentioning

confidence: 99%

Polyether‐b‐Amide Based Solid Electrolytes with Well‐Adhered Interface and Fast Kinetics for Ultralow Temperature Solid‐State Lithium Metal Batteries

Huang

Wang

et al. 2023

Adv Funct Materials

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“…The anion-derived SEI, by contrast, exhibits efficient dynamics for EC-free electrolyte. [116] In addition, the relatively strong coordination between Li + and EC also leads to sluggish desolvation upon cooling, both of which deteriorate the cold-climate behaviors and in turn highlight the significance of ECfree electrolyte. [78] Liner carbonates are widely introduced into EC electrolytes to formulate eutectic solutions to get superior performance.…”

Section: Carbonate-based Solventmentioning

confidence: 99%

Challenges and strategies of formulating low‐temperature electrolytes in lithium‐ion batteries

Qin

Zeng

Cheng

et al. 2023

Interdisciplinary Materials

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Lithium-ion batteries (LIBs) have monopolized energy storage markets in modern society. The reliable operation of LIBs at cold condition (<0°C), nevertheless, is inevitably hampered by the sluggish kinetics and parasite reactions, which falls behind the increasing demands for portable electronics and electric vehicles. The electrolyte controls both Li + transport and interfacial reaction, dictating the low-temperature performance substantially. Therefore, the rational formulation of electrolytes is significant for realizing superior lowtemperature performance and broadening application niches of LIBs. Herein, we first discuss the kinetic limitations of low-temperature LIBs, highlighting the importance of electrolyte structure and interfacial chemistry. Then, the advancements for formulating subzero-temperature electrolyte are summarized with in-depth discussions about electrolyte formulation, solvation structure, interfacial chemistry, and low-temperature behaviors. Moreover, some opportunities for lithium metal batteries and the corresponding lowtemperature electrolyte are covered. Finally, the major challenges and future perspectives are outlined for low-temperature LIBs.

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“…to detect deposited Li on an anode, but these post mortem/ex situ characterizations require cells to be torn down prior to measurement and cannot have an effective role for very early safety warnings. , Therefore, a nondestructive operando/in situ technology is urgently needed to detect the onset of local Li plating (e.g., corresponding time, voltage, or capacity, etc. ). , More importantly, a precise/effective quantitative method is further needed to help quantify the irreversible capacity loss on the Gr anode and corresponding influence of the Gr electrolyte interface (e.g., components and construction), pointing out explicit/clear direction for an electrolyte modification strategy to restrain the unwanted Li plating. − …”

Section: Oems Measurement For the First Overdischarge Of Gr–li Cellsmentioning

confidence: 99%

Quantifying the Influence of Li Plating on a Graphite Anode by Mass Spectrometry

et al. 2023

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The prominent problem with graphite anodes in practical applications is the detrimental Li plating, resulting in rapid capacity fade and safety hazards. Herein, secondary gas evolution behavior during the Li-plating process was monitored by online electrochemical mass spectrometry (OEMS), and the onset of local microscale Li plating on the graphite anode was precisely/ explicitly detected in situ/operando for early safety warnings. The distribution of irreversible capacity loss (e.g., primary and secondary solid electrolyte interface (SEI), dead Li, etc.) under Li-plating conditions was accurately quantified by titration mass spectroscopy (TMS). Based on OEMS/TMS results, the effect of typical VC/FEC additives was recognized at the level of Li plating. The nature of vinylene carbonate (VC)/fluoroethylene carbonate (FEC) additive modification is to enhance the elasticity of primary and secondary SEI by adjusting organic carbonates and/or LiF components, leading to less "dead Li" capacity loss. Though VC-containing electrolyte greatly suppresses the H 2 /C 2 H 4 (flammable/explosive) evolution during Li plating, more H 2 is released from the reductive decomposition of FEC.

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Ethylene‐Carbonate‐Free Electrolytes for Rechargeable Li‐Ion Pouch Cells at Sub‐Freezing Temperatures

Cited by 81 publications

References 37 publications

Polyether‐b‐Amide Based Solid Electrolytes with Well‐Adhered Interface and Fast Kinetics for Ultralow Temperature Solid‐State Lithium Metal Batteries

Polyether‐b‐Amide Based Solid Electrolytes with Well‐Adhered Interface and Fast Kinetics for Ultralow Temperature Solid‐State Lithium Metal Batteries

Challenges and strategies of formulating low‐temperature electrolytes in lithium‐ion batteries

Quantifying the Influence of Li Plating on a Graphite Anode by Mass Spectrometry

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