A Modified Ceramic-Coating Separator with High-Temperature Stability for Lithium-Ion Battery

Shi, Chuan; Dai, Jiangdong; Li, Chao; Shen, Xiu; Peng, Longqing; Zhang, Peng; Wu, Dezhi; Sun, Di; Zhao, Jinbao

doi:10.3390/polym9050159

Cited by 70 publications

(39 citation statements)

References 38 publications

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“…The electrolyte uptake is also an important parameter to determine the ionic conductivity and electrochemical properties of the separators, as a high electrolyte uptake is needed for reducing the internal ionic resistance of the cell and ensuring the high performance of the LIBs. [32,33] A good separator adsorbs and retains a large amount of liquid electrolyte when the cell is assembled. As shown in Table 1, the electrolyte uptake of the PI nanofibers was 750.5%, which is higher than that of the commercial separator SV718 (121.9%).…”

Section: Resultsmentioning

confidence: 99%

Sandwiched polyimide‐composite separator for lithium‐ion batteries via electrospinning and electrospraying

et al. 2020

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A novel type of sandwiched separator for lithium-ion batteries has been developed by combining electrospinning and electrospraying techniques. This separator consists of three layers in which the top and bottom layers are prepared by electrospinning a poly(amic acid) ammonium salt (PAAS) solution and the middle layer is obtained by electrospraying a mixture of the PAAS solution and inorganic nanoparticles (SiO 2 or Al 2 O 3). Subsequently, the sandwiched separators are imidized at 250 C in a nitrogen atmosphere. The morphology, porosity, thermal stability, mechanical strength, wettability and electrochemical performance of sandwiched separators were examined and the results were compared with those of a commercial separator (SV718). The thermal properties of the sandwiched separators and SV718 were determined using a thermal gravimetric analyzer and a differential scanning calorimeter. The sandwiched separators had no melting peak, whereas SV718 had a melting peak at 139 C, demonstrating the higher thermal stability of sandwiched separators. The electrolyte contact angles of sandwiched separators were around 11.5 , which were significantly lower than that of SV718. Moreover, the porosity and electrolyte uptake of sandwiched separators were over 81% and 910%, respectively, while those values of SV718 were 43% and 121%, respectively. The higher porosity, electrolyte uptake, and wettability of the sandwiched separators resulted in the better their cycling performance and higher specific-discharge capabilities than SV718.

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Section: Resultsmentioning

confidence: 99%

Sandwiched polyimide‐composite separator for lithium‐ion batteries via electrospinning and electrospraying

et al. 2020

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“…Next generation separator will inevitably have a composite structure to enable optimal thermal stability, mechanical strength, and conductivity. Ceramic coating of mono and multilayer separators increases mechanical resistance to thermal shrinkage and wettability (Roth et al, 2007;Shi et al, 2017). Alumina (Choi et al, 2010), BaTiO 3 (Nunes-Pereira et al, 2014), and silicon oxides (Kang et al, 2012) among others have been reported.…”

Section: Ceramic Based Separatorsmentioning

confidence: 99%

Batteries Safety: Recent Progress and Current Challenges

2019

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In this growing age of clean energy and the use of power storage to circumvent the use of traditional fossil fuel technologies, batteries of greater capacity, storage, and power are increasingly becoming indispensable. New chemistries are being developed to increase the capacity of traditional lithium ion batteries and to develop batteries beyond Lithium ion. Promising high capacity cathodes and anodes are developed however their large-scale deployment is hindered due to safety concerns. In this review, we summarize recent progress of lithium ion batteries safety, highlight current challenges, and outline the most advanced safety features that may be incorporated to improve battery safety for both lithium ion and batteries beyond lithium ion. Of particular interest is the issue of thermal runaway mitigation by incorporation of novel nano-materials and advanced technologies.

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“…However, reports of extremely low wettability with liquid electrolytes have limited its further application in energy storage systems for electric vehicles [27,28]. Ceramic coatings have successfully demonstrated resistance to thermal shrinkage in batteries in operating temperature ranges of 110-200 • C for 30 min [29].…”

Section: Cell Component Characterisationmentioning

confidence: 99%

Looking Deeper into the Galaxy (Note 7)

et al. 2018

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Li-ion cell designs, component integrity, and manufacturing processes all have critical influence on the safety of Li-ion batteries. Any internal defective features that induce a short circuit, can trigger a thermal runaway: a cascade of reactions, leading to a device fire. As consumer device manufacturers push aggressively for increased battery energy, instances of field failure are increasingly reported. Notably, Samsung made a press release in 2017 following a total product recall of their Galaxy Note 7 mobile phone, confirming speculation that the events were attributable to the battery and its mode of manufacture. Recent incidences of battery swelling on the new iPhone 8 have been reported in the media, and the techniques and lessons reported herein may have future relevance. Here we look deeper into the key components of one of these cells and confirm evidence of cracking of electrode material in tightly folded areas, combined with a delamination of surface coating on the separator, which itself is an unusually thin monolayer. We report microstructural information about the electrodes, battery welding attributes, and thermal mapping of the battery whilst operational. The findings present a deeper insight into the battery's component microstructures than previously disseminated. This points to the most probable combination of events and highlights the impact of design features, whilst providing structural considerations most likely to have led to the reported incidences relating to this phone.

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A Modified Ceramic-Coating Separator with High-Temperature Stability for Lithium-Ion Battery

Cited by 70 publications

References 38 publications

Sandwiched polyimide‐composite separator for lithium‐ion batteries via electrospinning and electrospraying

Sandwiched polyimide‐composite separator for lithium‐ion batteries via electrospinning and electrospraying

Batteries Safety: Recent Progress and Current Challenges

Looking Deeper into the Galaxy (Note 7)

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