Biocompatible zinc battery with programmable electro-cross-linked electrolyte

Xuesong Xie; Jingjing Li; Zhengyue Xing; Bingan Lu; Shuquan Liang; Jiang Zhou

doi:10.1093/nsr/nwac281

Biocompatible zinc battery with programmable electro-cross-linked electrolyte

Natl Sci Rev. 2022 Dec 14;10(3):nwac281. doi: 10.1093/nsr/nwac281. eCollection 2023 Mar.

Authors

Xuesong Xie¹, Jingjing Li², Zhengyue Xing¹, Bingan Lu³, Shuquan Liang¹, Jiang Zhou¹

Affiliations

¹ School of Materials Science and Engineering, Central South University, Changsha 410083, China.
² Department of Plastic Surgery, Xiangya Hospital of Central South University, Changsha 410008, China.
³ School of Physics and Electronics, Hunan University, Changsha 410082, China.

Abstract

Aqueous zinc batteries (ZBs) attract increasing attention for potential applications in modern wearable and implantable devices due to their safety and stability. However, challenges associated with biosafety designs and the intrinsic electrochemistry of ZBs emerge when moving to practice, especially for biomedical devices. Here, we propose a green and programmable electro-cross-linking strategy to in situ prepare a multi-layer hierarchical Zn-alginate polymer electrolyte (Zn-Alg) via the superionic binds between the carboxylate groups and Zn²⁺. Consequently, the Zn-Alg electrolyte provides high reversibility of 99.65% Coulombic efficiency (CE), >500 h of long-time stability and high biocompatibility (no damage to gastric and duodenal mucosa) in the body. A wire-shaped Zn/Zn-Alg/α-MnO₂ full battery affords 95% capacity retention after 100 cycles at 1 A g^-1 and good flexibility. The new strategy has three prominent advantages over the conventional methods: (i) the cross-linking process for the synthesis of electrolytes avoids the introduction of any chemical reagents or initiators; (ii) a highly reversible Zn battery is easily provided from a micrometer to large scales through automatic programmable functions; and (iii) high biocompatibility is capable of implanted and bio-integrated devices to ensure body safety.

Keywords: biocompatible zinc battery; green and programmable electro-cross-linking; polymer electrolyte.