Li-ion battery shut-off at high temperature caused by polymer phase separation in responsive electrolytes

Kelly, Jesse C.; Degrood, Nicholas L.; Roberts, Mark

doi:10.1039/c4cc10282g

Cited by 58 publications

(58 citation statements)

References 26 publications

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“…Reproduced with permission. [131] Copyright 2015, Royal Society of Chemistry. g) Illustration of sol-gel transition of electrolyte which slows the migration of conductive ions between the electrodes.…”

Section: Wwwadvenergymatdementioning

confidence: 99%

“…To further realize inherently safe high-energy-density LIBs, a Li 4 Ti 5 O 12 / LiFePO 4 rechargeable LIB (Figure 4d) adopting the thermally responsive poly(benzyl methacrylate) (PBMA) in an ionic liquid was developed. [131] The responsive electrolyte was composed of PBMA in 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [EMIM][TFSI], which would inhibit the operation of LIB at elevated temperatures. The mechanism of this electrolyte was based on the change in conductivity of the electrolyte due to the electronic insulator property of the PBMA.…”

Section: Gpes With Thermally Responsive Abilitymentioning

confidence: 99%

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Gel Polymer Electrolytes for Electrochemical Energy Storage

Cheng

Pan

Zhao

et al. 2017

Advanced Energy Materials

786

562

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storage devices with adjustable shapes and high flexibility, which is promising for the burgeoning portable and wearable electronics. [7][8][9] Furthermore, the flexibility and elasticity of GPEs are also prone to tolerate the volume change of electrode materials and the dendrites of lithium metal during charge and discharge processes. [10][11][12][13] As a consequence, GPEs have become one of the most desirable alternatives among various electrolytes for the electrochemical energy storage devices, and significant progress has been made in lithium-ion batteries (LIBs), supercapacitors (SCs), lithium-oxygen (Li-O 2 ) batteries as well as the other kinds of electrochemical energy storage devices, such as sodium-ion batteries, lithium-sulfur batteries, fuel cells, and zinc-air batteries. [14][15][16] In order to meet the requirements of wearable devices for flexibility and deformability, more special GPEs with tough, [17] stretchable, [18] and compressible [19] functionalities have been also developed.Typically, a polymeric framework is adopted in GPEs as host material, providing high mechanical integrity. Several criteria for a good polymer host lie in: [20][21][22] (i) fast segmental motion of polymer chain; (ii) special groups promoting the dissolution of salts; (iii) low glass transition temperature (T g ); (iv) high molecular weight; (v) wide electrochemical window; (vi) high degradation temperature. Within the framework, the salts in the GPEs serve as the sources of the charge carriers, which are generally required to have large anions and low dissociation energy for easier dissociating-induced free/mobile ions. According to the types of electrolytes, there are four categories of GPEs based on proton, [23] alkaline, [24] conducting salts, and ionic liquids (ILs). [25] The criteria for an appropriate electrolyte include: [26][27][28] (i) good dissociation without forming ion pairs or ion aggregation; (ii) high thermal, chemical, and electrochemical stability; (iii) high ionic conductivity. In order to dissolve both the polymer hosts and electrolytic salts, the organic/ aqueous solvents are introduced to provide the medium for ionic conduction. A good solvent should simultaneously have high dielectric constant (ɛ > 15), donor number for more dissociation of ion and chemical and electrochemical stability. Organic solvents normally include ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dimethyl formamide (DMF), dimethyl sulphoxide, ethyl methyl carbonate, and tetrahydrofuran.To prepare a high-performance GPE, it is essential to select the species of host polymer, solvent, and electrolytic salt, and then blend them by solution or melt processes, such as casting With the booming development of flexible and wearable electronics, their safety issues and operation stabilities have attracted worldwide attentions. Compared with traditional liquid electrolytes, gel polymer electrolytes (GPEs) are preferred due to their higher safety and adaptability to the design of ...

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Section: Wwwadvenergymatdementioning

confidence: 99%

Section: Gpes With Thermally Responsive Abilitymentioning

confidence: 99%

Gel Polymer Electrolytes for Electrochemical Energy Storage

Cheng

Pan

Zhao

et al. 2017

Advanced Energy Materials

786

562

View full text Add to dashboard Cite

show abstract

“…The lower critical solution temperature of the electrolytes modified by these smart polymers fully covers the thermal runaway temperature of LIBs. Aiming at this, Kelly et al conducted pioneering works. They demonstrated that the combination of a thermally reactive polymer, poly(benzyl methacrylate) (PBMA), and 1‐ethyl‐3‐methylimidazolium bis(trifluoromethanesulfonyl) imide) (LiTFSI/[EMIM][TFSI]) ionic liquid electrolyte could be used to reversibly turn off a LIB when the temperature increased over a predetermined threshold .…”

Section: New Libs Chemistries: Self‐protectionmentioning

confidence: 99%

“…Aiming at this, Kelly et al conducted pioneering works. They demonstrated that the combination of a thermally reactive polymer, poly(benzyl methacrylate) (PBMA), and 1‐ethyl‐3‐methylimidazolium bis(trifluoromethanesulfonyl) imide) (LiTFSI/[EMIM][TFSI]) ionic liquid electrolyte could be used to reversibly turn off a LIB when the temperature increased over a predetermined threshold . Figure a shows the thermal‐response mechanism at high temperatures and the effect of lithium salt on the thermally responsive performance.…”

Section: New Libs Chemistries: Self‐protectionmentioning

confidence: 99%

Smart Materials and Design toward Safe and Durable Lithium Ion Batteries

et al. 2019

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Smart electrochemical energy storage devices are devices that can operate autonomously to some extent. Although the conventional electrochemical energy storage devices, e.g., the commonly used lithium‐ion batteries (LIBs), may be externally monitored in terms of their voltage and current output to reflect the state of health for the devices, it is extremely important to exploit materials and devices that are intrinsically smart enough to be capable of rapidly self‐detecting and responding to faults, such as interior short circuits, overheating, abnormal capacity drop, and other types of mechanical/chemical damage. These “smart” features could significantly enhance the safety characteristics and durability of LIBs, which is essential for future usage. Therefore, recent achievements toward smart materials and design strategies for safer and more durable LIBs are summarized. The main categories are as follows: 1) New materials: This category mainly includes smart electrode materials with thermal/electrical/mechanical self‐response functions, and self‐response separators to suppress thermal runaway/lithium dendrite growth; 2) New chemistries: This category mainly includes electrolytes with reversible self‐protecting functions; and 3) New architectures with novel functions, such as shape‐recovery, self‐heating, and self‐monitoring. Besides the working mechanisms, the challenges that must be overcome for smart LIBs to be adopted in practical applications are also discussed.

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“…[71][72][73][74] The other route is to release or absorb the heat before overheating, e.g., employing safety vents, extinguishing agents, or a thermal fuse. [70,[75][76][77][78] Although these related studies showed some effects in thermal protection, they are limited by the passive strategies with significant sacrifices of energy storage performance and irreversible self-protection reactions.…”

Section: Smart Design To Avoid Overheatingmentioning

confidence: 99%

Smart Electrochemical Energy Storage Devices with Self‐Protection and Self‐Adaptation Abilities

Yang

Wang

et al. 2017

Advanced Materials

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Currently, with booming development and worldwide usage of rechargeable electrochemical energy storage devices, their safety issues, operation stability, service life, and user experience are garnering special attention. Smart and intelligent energy storage devices with self‐protection and self‐adaptation abilities aiming to address these challenges are being developed with great urgency. In this Progress Report, we highlight recent achievements in the field of smart energy storage systems that could early‐detect incoming internal short circuits and self‐protect against thermal runaway. Moreover, intelligent devices that are able to take actions and self‐adapt in response to external mechanical disruption or deformation, i.e., exhibiting self‐healing or shape‐memory behaviors, are discussed. Finally, insights into the future development of smart rechargeable energy storage devices are provided.

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Li-ion battery shut-off at high temperature caused by polymer phase separation in responsive electrolytes

Cited by 58 publications

References 26 publications

Gel Polymer Electrolytes for Electrochemical Energy Storage

Gel Polymer Electrolytes for Electrochemical Energy Storage

Smart Materials and Design toward Safe and Durable Lithium Ion Batteries

Smart Electrochemical Energy Storage Devices with Self‐Protection and Self‐Adaptation Abilities

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