In situ construction of High-safety and Non-flammable polyimide “Ceramic” Lithium-ion battery separator via SiO2 Nano-Encapsulation

Wu, Danyang; Dong, Nianguo; Wang, Ruihan; Qi, Shengli; Liu, Bingxue; Wu, Dezhen

doi:10.1016/j.cej.2021.129992

Cited by 36 publications

(19 citation statements)

References 36 publications

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“…As a comparison, the F-PPTA@PP separator delivers an initial capacity a high initial capacity of 84.8 mAh g -1 with a capacity attenuation of 51% and a stable CE of 99% after 300 cycles at 30 C. The cycling performance of the F-PPTA@PP separator was given in a comprehensive comparison (cycling number, attenuation rate, current density and materials loading) to other recent separators employed in LMBs (Table S7, Supporting Information). [19,[63][64][65][66][67][68][69][70][71][72][73][74] Compared with other similarly reported separators collocated with NCM811 cathodes, the F-PPTA@PP separator delivers the longest cycle time (1000 cycles) at 0.5 C, synchronously enabling the slowest capacity attenuation (0.02% per cycle) (Figure 6e). Noticeably, the F-PPTA@PP separator still presents the best cycle performance at the highest C rate (30 C) with an acceptable capacity attenuation (0.06% per cycle).…”

Section: Resultsmentioning

confidence: 99%

Thermally Stable and Dendrite‐Resistant Separators toward Highly Robust Lithium Metal Batteries

Sun

Wang

Chen

et al. 2022

Advanced Energy Materials

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Metallic lithium (Li) has been considered as an attractive anode material for next-generation rechargeable batteries, owing to its high theoretical capacity (3860 mAh g -1 ), low redox potential (−3.040 V vs standard hydrogen electrode), and low density (0.59 g cm -3 ). [4][5] Nevertheless, the high activity of Li metal, nonuniform Li plating, large volume change, and the formation of fragile solid electrolyte interphase (SEI) layer in lithium metal batteries (LMBs) inevitably lead to negative effects of the low Coulombic efficiency (CE), the uncontrollable growth of Li dendrite, the formation of "dead" Li, etc. [6][7][8][9] These intractable problems can cause irreversible loss of Li metal and electrolyte, resulting in a sustaining capacity attenuation or even triggering thermal runaway and explosion of the battery. Thermal runaway-induced accidents should be a wakeup call that people need to focus more attention on the battery safety and avoid undesirable energy release during battery cycling, since the batteries with higher energy density always endure lower thermal stability during operation. [10][11][12] Consequently, it is of vital importance to achieve robust LMBs security in the progress of developing Li metal anode and constantly breaking the bottleneck of energy density.As a critical component in batteries, separator not only provides paths for Li ion transfer, but also prevents accidental contact of anode and cathode. [13] According to statistics, at least 90% of various battery abuses (e.g., mechanical-abuse, electrical-abuse, thermal-abuse, and electrochemical-abuse) are related to internal short circuits caused by the failure of separator. [14] The prominent weak point of conventional polyolefin separators is their low melting point (135 °C for polyethylene (PE) separator and 165 °C for polypropylene (PP) separator), [15] which means they can easily shrink and collapse upon thermalabuse. To address this issue, tremendous efforts have been devoted to designing thermal-safety separators. [16] Metal oxides with polar surfaces (e.g., SiO 2 and Al 2 O 3 ) have been commonly reported as protective layers to enhance the thermal resistance of polyolefin separator. [17] Some inorganic materials with high Li-ion, thermal conductivity or flame retardance (e.g.,

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Section: Resultsmentioning

confidence: 99%

Thermally Stable and Dendrite‐Resistant Separators toward Highly Robust Lithium Metal Batteries

Sun

Wang

Chen

et al. 2022

Advanced Energy Materials

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“…Using this as-synthesized separator, both Li‖Li and LFP‖Li systems exhibited improved cycling stability at 60 °C. In addition, inorganic materials such as SiO 2 , 169,170 Al 2 O 3 , 171 and ZrO 2 (ref. 172) are reported as nonflammable fillers in separators to improve the thermal stability.…”

Section: Design Of Flame-retardant Cell Componentsmentioning

confidence: 99%

Recent progress in nonflammable electrolytes and cell design for safe Li-ion batteries

2023

J. Mater. Chem. A

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“…In addition, polyolefin separator has poor heat resistance and dimensional stability, these factors limit the further optimization of lithium-ion battery performance. 15,18,21,22 T h i s c o n t e n t i s To further improve the performance of the lithium-ion battery via improving the above properties of separator becomes an important and essential issue. Series studies have been reported to achieve this goal, which can be divided into two main aspects: The first method is to coat inorganic ceramics on polyolefin separator surface such as SiO 2 , 23,24 Al 2 O 3 , 25 TiO 2 , 26 etc., which indeed optimized the wettability of the separator and improved the thermal dimensional stability of the separator.…”

Section: Introductionmentioning

confidence: 99%

Fluorine-Initiated Carboxyl Group Enhanced Combination Properties of the Polyethylene Separator for Lithium-Ion Batteries

Shi

Zhang

et al. 2023

ACS Appl. Polym. Mater.

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Due to the intrinsic inertness of polyethylene (PE), it is difficult to induce polar oxygen-containing groups onto the PE separator surface under mild conditions on a large scale and further enhance their wettability. Herein, utilizing the ultrastrong oxidation of elemental fluorine (F 2 ), it was found that F 2 could easily react with the PE separator surface via radical-related routes, and thus oxygen would be naturally captured onto the separator surface for its radical affinity. The fluorinated PE separator exhibited significantly improved wettability as the water contact angle decreased from 117°to 62°at the minimum. Therefore, electrolyte uptake of the fluorinated separator reached 803.9% (of which the PE electrolyte uptake was 246.2%), and the ionic conductivity increased from 0.29 to 0.52mS/cm. Capacity retention of LiCoCO 2 /graphite cells assembled by a fluorinated PE separator increased to 80.4% from 73.2% after 200 cycles of charge−discharge, and the discharge capacity of it also increased 38.83% (from 79.07 mAh/ g to 109.77 mAh/g) at 1.2 C. Besides, due to the spontaneous coupling between direct fluorination induced radicals, micro-crosslinking spots were generated, and thus, modulus and thermal deformability, which meant service stability of the separator, were also improved. Therefore, direct fluorination could be considered an effective post-treatment strategy for high-performance PE separators.

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In situ construction of High-safety and Non-flammable polyimide “Ceramic” Lithium-ion battery separator via SiO2 Nano-Encapsulation

Cited by 36 publications

References 36 publications

Thermally Stable and Dendrite‐Resistant Separators toward Highly Robust Lithium Metal Batteries

Thermally Stable and Dendrite‐Resistant Separators toward Highly Robust Lithium Metal Batteries

Recent progress in nonflammable electrolytes and cell design for safe Li-ion batteries

Fluorine-Initiated Carboxyl Group Enhanced Combination Properties of the Polyethylene Separator for Lithium-Ion Batteries

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