气候变化领域集成服务门户(CCPortal): Stackable bipolar pouch cells with corrosion-resistant current collectors enable high-power aqueous electrochemical energy storage

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DOI	10.1039/c8ee00546j
	Stackable bipolar pouch cells with corrosion-resistant current collectors enable high-power aqueous electrochemical energy storage
	Evanko B.; Yoo S.J.; Lipton J.; Chun S.-E.; Moskovits M.; Ji X.; Boettcher S.W.; Stucky G.D.
发表日期	2018
ISSN	17545692
起始页码	2865
结束页码	2875
卷号	11 期号:10
英文摘要	A critical bottleneck in the development of aqueous electrochemical energy storage systems is the lack of viable complete cell designs. We report a metal-free, bipolar pouch cell designed with carbon black/polyethylene composite film (CBPE) current collectors as a practical cell architecture. The light-weight, corrosion-resistant CBPE provides stable operation in a variety of aqueous electrolytes over a ∼2.5 V potential range. Because CBPE is heat-sealable, it serves simultaneously as both the pouch cell packaging and seal in addition to its use as a current collector. Although this non-metallic composite has a low electrical conductivity relative to metal foils, current travels only a short distance in the through-plane direction of the current collector in the bipolar cell configuration. This shorter path length lowers the effective electrical resistance, making the design suitable for high-power applications. We test the cell architecture using an aqueous ZnBr2 battery chemistry and incorporate tetrabutylammonium cations to improve the intrinsic low Coulombic efficiency and fast self-discharge of non-flow ZnBr2 cells. These devices demonstrate a cell-level energy density of 50 W h L-1 at a 10C rate (0.5 kW L-1), with less than 1% capacity loss over 500 cycles. A large-area (>6 cm2) 4-cell stack is built to illustrate that the pouch cells are scalable to practical dimensions and stackable without sacrificing performance. The device operates in the range of 6-7 V and has an internal self-balancing mechanism that prevents any individual cell in the stack from overcharging. The results thus demonstrate both a conceptually new cell architecture that is broadly applicable to many aqueous electrolyte chemistries and a specific high-performance example thereof. © 2018 The Royal Society of Chemistry.
英文关键词	Architecture; Bromine compounds; Carbon black; Composite films; Electric current collectors; Electric discharges; Electrolytes; Energy storage; Metals; Zinc compounds; Aqueous electrolyte; Battery chemistries; Corrosion-resistant; Coulombic efficiency; Electrical conductivity; Electrical resistances; Electrochemical energy storage; High power applications; Corrosion resistance; aqueous solution; efficiency measurement; electrical conductivity; electrochemical method; electrolyte; energy storage; equipment; fuel cell; operations technology; performance assessment; polymer
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190118
作者单位	Materials Department, University of California, Santa Barbara, CA 93106, United States; Materials Research Laboratory, University of California, Santa Barbara, CA 93106, United States; Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106, United States; School of Materials Science and Engineering, Kyungpook National University, Daegu, 41566, South Korea; Department of Chemistry, Oregon State University, Corvallis, OR 97331, United States; Department of Chemistry and Biochemistry, University of Oregon, Eugene, OR 97403, United States
推荐引用方式 GB/T 7714	Evanko B.,Yoo S.J.,Lipton J.,et al. Stackable bipolar pouch cells with corrosion-resistant current collectors enable high-power aqueous electrochemical energy storage[J],2018,11(10).
APA	Evanko B..,Yoo S.J..,Lipton J..,Chun S.-E..,Moskovits M..,...&Stucky G.D..(2018).Stackable bipolar pouch cells with corrosion-resistant current collectors enable high-power aqueous electrochemical energy storage.Energy & Environmental Science,11(10).
MLA	Evanko B.,et al."Stackable bipolar pouch cells with corrosion-resistant current collectors enable high-power aqueous electrochemical energy storage".Energy & Environmental Science 11.10(2018).