Lithium-silica nanosalt as a low-temperature electrolyte additive for lithium-ion batteries

Hamenu, Louis; Lee, Hae Soo; Mohammed, Latifatu; Kim, Kwang Man; Park, Jong‐Wook; Baek, Yong Gu; Ko, Jang Myoun; Kaner, Richard B.

doi:10.1016/j.cap.2016.03.012

Cited by 27 publications

(11 citation statements)

References 36 publications

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“…The resistances and kinetic barrier to Li + would increase as temperature goes down, and numerous studies have been seeking the reduction of these resistances so as to improve the low-temperature capability of LIBs. Successful strategies include employing low-freezing-point solvents like ethyl methyl carbonate (EMC), propylene carbonate (PC), and diethyl carbonate, − and co-solvents like 2,2,2-trifluoroethyl- N -caproate and carboxylate esters, , utilization of various lithium salts combinations such as lithium oxalyldifluoroborate/lithium tetrafluoroborate (LiBF 4 ), lithium bis(oxalato)borate/LiBF 4 ; − and the other additional additives like lithium-modified silica nanosalt. , Although improvement was achieved, the fundamental mechanism behind the origin of reduced resistances remains unclear, and controversies often arise. It has been noted early on that bulk ion conductivity of electrolyte may not be the limiting factor determining the low-temperature performance of an LIB; ,, instead, Li + migration across the SEI might be the most sluggish step. ,, Xu et al , and Abe et al independently proposed that Li + ion transfer barrier through the interface of electrolyte/electrode is overwhelmed by the Li + desolvation process before intercalating into graphite interlayers.…”

Section: Introductionmentioning

confidence: 99%

Li⁺-Desolvation Dictating Lithium-Ion Battery’s Low-Temperature Performances

Zheng

et al. 2017

ACS Appl. Mater. Interfaces

246

210

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Lithium (Li) ion battery has penetrated almost every aspect of human life, from portable electronics, vehicles, to grids, and its operation stability in extreme environments is becoming increasingly important. Among these, subzero temperature presents a kinetic challenge to the electrochemical reactions required to deliver the stored energy. In this work, we attempted to identify the rate-determining process for Li migration under such low temperatures, so that an optimum electrolyte formulation could be designed to maximize the energy output. Substantial increase in the available capacities from graphite∥LiNiCoAlO chemistry down to -40 °C is achieved by reducing the solvent molecule that more tightly binds to Li and thus constitutes a high desolvation energy barrier. The fundamental understanding is applicable universally to a wide spectrum of electrochemical devices that have to operate in similar environments.

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Section: Introductionmentioning

confidence: 99%

Li⁺-Desolvation Dictating Lithium-Ion Battery’s Low-Temperature Performances

Zheng

et al. 2017

ACS Appl. Mater. Interfaces

246

210

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“…Particularly, the graphite|LiCoO 2 full‐cell exhibited higher capacity retention of 81 % at −20 °C in the electrolyte (i. e., 1.0 M LiPF 6 in EC/PC/DEC/EMC/VC/FEC) with 1 % PDMS‐A (Figure 6d). This is because the modified electrolyte has adequate ionic conductivities of ∼0.2 mS cm −1 and a lower interface impedance of 4.4 Ω at −20 °C (Figure 6c) [76a,b] . Besides, the electrochemical stability can be improved to over 5.5 V and the interface impedance could achieve as low as 2.4 Ω at −20 °C when the PDMS‐A and Li‐SiO 2 were used together (Figure 6c).…”

Section: Additivesmentioning

confidence: 99%

Low‐Temperature Electrolyte Design for Lithium‐Ion Batteries: Prospect and Challenges

Liu

Cheng

et al. 2021

Chemistry A European J

165

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Lithium-ion batteries have dominated the energy market from portable electronic devices to electric vehicles. However, the LIBs applications are limited seriously when they were operated in the cold regions and seasons if there is no thermal protection. This is because the Li + transportation capability within the electrode and particularly in the electrolyte dropped significantly due to the decreased electrolyte liquidity, leading to a sudden decline in performance and short cycle-life. Thus, design a low-temperature electrolyte becomes ever more important to enable the further applications of LIBs. Herein, we summarize the low-temperature electrolyte development from the aspects of solvent, salt, additives, electrolyte analysis, and performance in the different battery systems. Then, we also introduce the recent new insight about the cation solvation structure, which is significant to understand the interfacial behaviors at the low temperature, aiming to guide the design of a low-temperature electrolyte more effectively.

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“…79 A particularly unique design comes from Ko et al, who reported on a lithium-modified silica nanosalt (''Li202'') synthesized by treating hydrophobic silica with LiH, followed by 1,3-propane sultone. 85 The resulting sulfonate-rich surface allowed the silica to form a stable dispersion (2.5 wt%) with an electrolyte solution of 1 M LiPF 6 in EC/PC/EMC/DEC 20 : 5 : 55 : 20 v/v + 2 wt% vinylene carbonate (VC). The presence of Li202 additive slightly improved the cycling performance of Gr8LiCoO 2 coin cells at À20 1C when compared to the electrolyte alone and a non-functionalized silica dispersion.…”

Section: Reviewmentioning

confidence: 99%