Mesoporous Cladophora cellulose separators for lithium-ion batteries

Pan, Ruijun; Cheung, Ocean; Wang, Zhaohui; Tammela, Petter; Huo, Jinxing; Lindh, Jonas; Edström, Kristina; Strömme, Maria; Nyholm, Leif

doi:10.1016/j.jpowsour.2016.04.115

Cited by 108 publications

(76 citation statements)

References 38 publications

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“…This approach differs from that used in our previous work where two aluminum plates were used to clamp the wet separator (i.e. constraint drying) during the drying (Pan et al 2016). The notations CC-25, CC-50 and CC-100 are used to denote separators prepared with 25, 50 and 100 mL CC dispersion, respectively.…”

Section: Preparation Of CC Separatorsmentioning

confidence: 98%

“…The CC separators were manufactured based on the paper-making approach described in our previous publication (Pan et al 2016). In the present work, a dispersion of 300 mg CC in 200 mL water was prepared by ultrasonication (VibraCell 750 W, Sonics, USA) for 15 min.…”

Section: Preparation Of CC Separatorsmentioning

confidence: 99%

“…One of the most studied and utilized alternative materials is cellulose, due to its abundance, thermal stability, hydrophilicity and low cost (Carlsson et al 2014;Mihranyan 2011;Pan et al 2016;Wang et al 2014;Xiao et al 2014;Zhu et al 2016;Zolin et al 2015). It has been reported that cellulose/polysulfonamide composite separators exhibit good wettabilities and high thermal stabilities (Xu et al 2014b) and that cellulose membranes produced by force spinning of cellulose acetate also exhibit good wettabilities, high porosities and high ionic conductivities (Weng et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Since cellulose often contains significant amounts of water it is, however, very important to choose a type of cellulose that contains as little water as possible (Lu et al 2016). We have recently shown that separators made from Cladophora cellulose (CC) are particularly well-suited due to the low water content of this type of cellulose (Pan et al 2016). It was demonstrated that a 36 lm thick CC separator, exhibited a better performance than the Solupor Ò control separator, in terms of thermal stability, wettability and ionic conductivity (Pan et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…We have recently shown that separators made from Cladophora cellulose (CC) are particularly well-suited due to the low water content of this type of cellulose (Pan et al 2016). It was demonstrated that a 36 lm thick CC separator, exhibited a better performance than the Solupor Ò control separator, in terms of thermal stability, wettability and ionic conductivity (Pan et al 2016). These results show that CC is a promising separator material that is worth further studies particularly as such separators most likely can be manufactured using upscalable paper-making processes.…”

Section: Introductionmentioning

confidence: 99%

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Thickness difference induced pore structure variations in cellulosic separators for lithium-ion batteries

et al. 2017

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The pore structure of the separator is crucial to the performance of a lithium-battery as it affects the cell resistance. Herein, a straightforward approach to vary the pore structure of Cladophora cellulose (CC) separators is presented. It is demonstrated that the pore size and porosity of the CC separator can be increased merely by decreasing the thickness of the CC separator by using less CC in the manufacturing of the separator. As the pore size and porosity of the CC separator are increased, the mass transport through the separator is increased which decreases the electrolyte resistance in the pores of the separator. This enhances the battery performance, particularly at higher cycling rates, as is demonstrated for LiFePO 4 /Li half-cells. A specific capacity of around 100 mAh g -1 was hence obtained at a cycling rate of 2 C with a 10 lm thick CC separator while specific capacities of 40 and close to 0 mAh g -1 were obtained for separators with thicknesses of 20 and 40 lm, respectively. As the results also showed that a higher ionic conductivity was obtained for the 10 lm thick CC separator than for the 20 and 40 lm thick CC separators, it is clear that the different pore structure of the separators was an important factor affecting the battery performance in addition to the separator thickness. The present straightforward, yet efficient, strategy for altering the pore structure hence holds significant promise for the manufacturing of separators with improved performance, as well as for fundamental studies of the influence of the properties of the separator on the performance of lithium-ion cells.

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Section: Preparation Of CC Separatorsmentioning

confidence: 98%

Section: Preparation Of CC Separatorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Thickness difference induced pore structure variations in cellulosic separators for lithium-ion batteries

et al. 2017

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Polymer‐Based Sustainable Separators inLi‐Ion Battery Applications: Mechanisms and Types of Polymeric Materials Used

Mahadevaprasad,

Nataraj

2024

Nanostructured Materials for Energy Storage

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Sustainable Separators for High‐Performance Lithium Ion Batteries Enabled by Chemical Modifications

Zhang

Chen

Tian

et al. 2019

Adv Funct Materials

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Natural polymer nanofibers are attractive sustainable raw materials to fabricate separators for high-performance lithium ion batteries (LIBs). Unfortunately, complicated pore-forming processes, low ionic conductivity, and relatively low mechanical strength of previously reported natural polymer nanofiber-based separators severely limit their performances and applications. Here, a chemical modification strategy to endow high performance to natural polymer nanofiber-based separators is demonstrated by grafting cyanoethyl groups on the surface of chitin nanofibers. The fabricated cyanoethyl-chitin nanofiber (CCN) separators not only exhibit much higher ionic conductivity but also retain excellent mechanical strength in comparison to unmodified chitin nanofiber separators. Through density function theory calculations, the mechanism of high Li + ion transport in the CCN separator is unraveled as weakening of the binding of Li+ ions over that of PF 6 − ions with chitin, via the cyanoethyl modification. The LiFePO 4 /Li 4 Ti 5 O 12 full cells using CCN separators show much better rate capability and enhanced capacity retention compared to the cell using commercial polypropylene (PP) separators. Beyond this, the CCN separator can work very well even at an elevated temperature of 120 °C in the LiFePO 4 /Li cell. The proposed strategy chemical modification of natural polymer nanofibers will open a new avenue to fabricate sustainable separators for LIBs with superior performance.

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Mesoporous Cladophora cellulose separators for lithium-ion batteries

Cited by 108 publications

References 38 publications

Thickness difference induced pore structure variations in cellulosic separators for lithium-ion batteries

Thickness difference induced pore structure variations in cellulosic separators for lithium-ion batteries

Polymer‐Based Sustainable Separators inLi‐Ion Battery Applications: Mechanisms and Types of Polymeric Materials Used

Sustainable Separators for High‐Performance Lithium Ion Batteries Enabled by Chemical Modifications

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