Electrolyte Dynamics Engineering for Flexible Fiber-Shaped Aqueous Zinc-Ion Battery with Ultralong Stability

Abstract

Flexible aqueous zinc-ion batteries (ZIBs) are considered as promising energy storage devices for wearable electronics due to their costeffectiveness, environmental friendliness, and high theoretical energy density. Herein, a flexible fiber-shaped aqueous ZIB is demonstrated by using a selfassembled Co 3 O 4 nanosheet array on a carbon nanotube fiber as the cathode and Zn nanosheets deposited on a carbon nanotube fiber as the anode. The cycle life span of the fiber-shaped battery is largely enhanced by a simple electrolyte dynamics engineering strategy of preadding a trace amount of Co 2+ cations in the mild aqueous electrolyte. The assembled fiber-shaped ZIB shows a high specific capacity (158.70 mAh g −1 at 1 A g −1 ), superior rate capacity, and excellent cycling life span (97.27% capacity retention after 10,000 cycles). Additionally, the fiber-shaped ZIB also shows superior flexibility, which can charge a smart watch under deformed states. This work provides new opportunities for the development of flexible, safe, and highperformance energy storage devices for wearable electronics.

Atomically‐Dispersed Fe‐N4 on 3D Hierarchical Porous Carbon for High‐Performance Lithium‐Sulfur Battery

“…The Fe signal is weak because of the low iron content in the sample, [53] which was only 1.06 wt% as determined by inductively coupled plasma optical emission spectrometry (ICP‐OES). In Figures 4(b) and S3, a distinct C−N peak could be derived from the C 1s spectra, confirming the successful N doping into the carbon skeleton [54–57] . Figures 4(c) and S4 depicted that the N 1s high resolution spectra of Fe‐SA‐3DHPC could be deconvoluted into five small peaks, attributing to pyridinic‐N (398.6 eV), Fe‐N x (399.8 eV), pyrrolic‐N (401.1 eV), graphitic‐N (402.3 eV), and oxidized‐N (403.8 eV) [53] .…”

“…In Figures 4(b) and S3, a distinct CÀ N peak could be derived from the C 1s spectra, confirming the successful N doping into the carbon skeleton. [54][55][56][57] Figures 4(c) and S4 depicted that the N 1s high resolution spectra of Fe-SA-3DHPC could be deconvoluted into five small peaks, attributing to pyridinic-N (398.6 eV), Fe-N x (399.8 eV), pyrrolic-N (401.1 eV), graphitic-N (402.3 eV), and oxidized-N (403.8 eV). [53] The high-resolution XPS spectrum of Fe 2p was composed of five peaks: the peaks at 709.0 eV and 721.3 eV could be due to Fe 2 + , the ones at 711.6 eV and 724.9 eV were attributed to Fe 3 + , and the peak at 714.6 eV could be assigned to the satellite peak (Figure 4d).…”

Charge‐Enriched Strategy Based on MXene‐Based Polypyrrole Layers Toward Dendrite‐Free Zinc Metal Anodes

“…To address the inherent dendrite issue of Zn metal anode in aqueous electrolyte, some effective strategies have been explored, such as designing the structure of Zn anodes, [7][8][9][10] optimizing the composition of electrolytes, [11][12][13][14][15] developing novel separators, [16][17][18] and constructing artificial interfaces on Zn anodes. [19][20][21][22][23] In particular, the artificial interfaces on Zn anodes can not only restrain be employed as an artificial layer to homogenize the dispersions of electric field and ion flux (Figure 1a,b), thus inducing a dendrite-free morphology.…”

Recent Advances and Future Perspectives of Fiber-Shaped Batteries

“…Fiber-shaped lithium-ion batteries have been considered the most promising candidate for practical applications. Followed by the ion storage mechanism and manufacturing strategy maturation, more novel 1D FSBs, for example, lithium-ion batteries (LIBs), , lithium–sulfur (Li–S) batteries, metal (lithium, zinc, and aluminum)–air batteries (MABs), , dual ion batteries, Ni–Fe batteries, and zinc-ion batteries, toward wearable energy storage with ultralong stability, , have been rapidly developed on the basis of the similar mechanism and assembly strategies of planar batteries, chasing the target of high capacity, high safety, and industrial production …”

“…Important advances starting from limited to scale-processable forms. This figure was reproduced with permissions from refs − , copyright Wiley-VCH; refs and , copyright American Chemical Society; and refs and , copyright Elsevier.…”