Anion Texturing Towards Dendrite‐Free Zn Anode for Aqueous Rechargeable Batteries

Abstract

The reversibility of metal anode is af undamental challenge to the lifetime of rechargeable batteries.T hough being widely employed in aqueous energy storage systems, metallic zinc suffers from dendrite formation that severely hinders its applications.H ere we report texturing Zn as an effective way to address the issue of zinc dendrite.Anin-plane oriented Zn texture with preferentially exposed (002) basal plane is demonstrated via as ulfonate anion-induced electrodeposition, noting no solid report on (002) textured Zn till now. Anion-induced reconstruction of zinc coordination is revealed to be responsible for the texture formation. Benchmarking against its (101) textured-counterpart by the conventional sulphate-based electrolyte,the Zn (002) texture enables highly reversible stripping/plating at ah igh current density of 10 mA cm À2 ,s howing its dendrite-free characteristics.T he Zn (002) texture-based aqueous zinc battery exhibits excellent cycling stability.T he developed anion texturing approach provides ap athwayt owards exploring zinc chemistry and prospering aqueous rechargeable batteries.

Simultaneous Regulation on Solvation Shell and Electrode Interface for Dendrite‐Free Zn Ion Batteries Achieved by a Low‐Cost Glucose Additive

“…As shown in Figures 4 c and S17, the Zn//Zn symmetric coin cell using ZnSO 4 ‐glucose electrolyte can stably cycle for over 2000 h at 1 mA cm −2 with 1 mAh cm −2 and 740 h at 2 mA cm −2 with 2 mAh cm −2 , while those using pure ZnSO 4 electrolyte are short‐circuited after 300 and 200 h of cycling under the same conditions. More attractively, even employing a high current of 5 mA cm −2 and a high capacity of 5 mAh cm −2 , this novel electrolyte system still supports stably reversible Zn plating/stripping for around 270 h (Figure 4 d), which is much superior to that using pure ZnSO 4 (around 20 h) and better than most of previous work (Table S1) [11, 13, 14, 21, 23–26, 36, 44, 45] …”

Simultaneous Regulation on Solvation Shell and Electrode Interface for Dendrite‐Free Zn Ion Batteries Achieved by a Low‐Cost Glucose Additive

“…As shown in Figures 4 c and S17, the Zn//Zn symmetric coin cell using ZnSO 4 ‐glucose electrolyte can stably cycle for over 2000 h at 1 mA cm −2 with 1 mAh cm −2 and 740 h at 2 mA cm −2 with 2 mAh cm −2 , while those using pure ZnSO 4 electrolyte are short‐circuited after 300 and 200 h of cycling under the same conditions. More attractively, even employing a high current of 5 mA cm −2 and a high capacity of 5 mAh cm −2 , this novel electrolyte system still supports stably reversible Zn plating/stripping for around 270 h (Figure 4 d), which is much superior to that using pure ZnSO 4 (around 20 h) and better than most of previous work (Table S1) [11, 13, 14, 21, 23–26, 36, 44, 45] …”

“…As ar esult, the symmetric cells using ZnSO 4glucose electrolyte also can present much better cycling stability.A ss hown in Figures 4c and S17, the Zn//Zn symmetric coin cell using ZnSO 4 -glucose electrolyte can stably cycle for over 2000 ha t1mA cm À2 with 1mAh cm À2 and 740 ha t2mA cm À2 with 2mAh cm À2 ,w hile those using pure ZnSO 4 electrolyte are short-circuited after 300 and 200 ho fc ycling under the same conditions.M ore attractively, even employing ah igh current of 5mAcm À2 and ahigh capacity of 5mAh cm À2 ,t his novel electrolyte system still supports stably reversible Zn plating/stripping for around 270 h( Figure 4d), which is much superior to that using pure ZnSO 4 (around 20 h) and better than most of previous work (Table S1). [11,13,14,21,[23][24][25][26]36,44,45] Besides,d ifferent glucose concentration is capable of influencing their performance in suppressing dendrite,a sd escribed in details in the supplied discussion in the Supporting Information (Figures S18-S20 and Table S2). Considering both ion conductivity,c ycling stability of Zn//Zn symmetric cells and CE of Zn-MnO 2 full cells under different current densities, 10 mM was selected as the final concentration.…”

“…[8][9][10] Them ajor obstacle for developing advanced ZIBs with long cycle life lies in the suppression of Zn dendrite and byproducts derived from decomposition of active H 2 Om olecules belonging to solvation layer of Zn 2+ inside the electrolyte. [8] There are numerous strategies to alleviate or suppress the Zn dendrite under some mild test conditions,s uch as controlling oriented growth of specific crystal plane, [11,12] coating ap rotective layer on Zn surface, [13][14][15][16] depositing Zn nanostructure on 3D skeleton, [17][18][19][20] modulating electrolyte structure. [21][22][23][24][25][26][27][28] Mixing some additives (including solute or solvent) into the original electrolyte is asimple and affordable solution for restraining the growth of dendrite.…”

Current Advances on Zn Anodes for Aqueous Zinc‐Ion Batteries

“…An anion‐induced Zn (002) texture formation was established via the strong sulfonate ‐Zn 2+ interaction, which reshapes the zinc coordination in the salt‐in water regime (Figure 3C) [39a] . Pole figure was applied to verify the planar arrangement of (002) basal plane (Figure 3D).…”