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Highly compressible zinc-ion batteries with stable performance

Cao, Hongmei, Wan, Fang, Zhang, Linlin, Dai, Xi, Huang, Shuo, Liu, Lili, Niu, Zhiqiang
Journal of materials chemistry A 2019 v.7 no.19 pp. 11734-11741
carbon, cathodes, compression strength, durability, electrochemistry, electronics, energy, lithium batteries
Elastic energy storage devices are necessary to build a self-powered strain-tolerant system with flexible or compressible electronics. Zinc-ion batteries (ZIBs) are one of the most promising alternatives to lithium ion batteries due to their significant advantages. Therefore, we developed highly compressible ZIBs based on micro–nano structured polyaniline–single-walled carbon nanotube–sponge cathodes. Benefiting from the unique configuration, compressible ZIBs exhibit stable electrochemical performance and good mechanical durability even under a compressive strain of 60%. Furthermore, after being compressed 1000 times, the batteries still deliver capacity retentions of 90.7% and nearly 100% under strains of 0% and 60%, respectively. In addition, the compressible ZIBs can be integrated together in series or parallel to increase the output potential and/or current. It opens an avenue for a broad range of compression-tolerant energy-storage devices which are compatible with highly compressible electronics.