Zn-In Alloying Powder Solvent Free Electrode Toward High-Load Ampere-Hour Aqueous Zn-Mn Secondary Batteries.

Aqueous Zn-ion batteries (ZIBs) are promising candidates for large-scale energy storage due to high safety, abundant reserves, low-cost, and high energy density. However, the reversibility of the metallic Zn anode in the mild electrolyte is still unsatisfactory, due to the Zn dendrite growth, hydrogen evolution, and corrosion passivation. Herein, a Zn-In alloying powder solvent free electrode is proposed to replace the Zn foil in ZIBs. The novel Zn anodes are constructed by a solvent-free manufacturing process with carbons, forming a 3D Zn deposition network and providing uniformly electric field distribution. The In on the Zn powder surface can increase the overpotential for hydrogen evolution and further improve the morphology of Zn deposition against dendrite growth. The Zn solvent-free electrodes enable the Zn-MnO2 batteries with high cathode loading mass of 10-20 mg cm-2 to achieve >380 stable cycles. Furthermore, the assembled soft package batteries of 2.4 Ah (52 Wh kg-2 ) is evaluated and the capacity retention is maintained at 80% after 200 cycles at a high areal capacity of 5 mAh cm-2 without gas evolution. This work offers a workable strategy to develop a durable Zn anode for the eventually commercial applications of aqueous Zn-Mn secondary batteries.

[A comparison of early and late reconstruction and repositioning of orbital blow-out fracture].

OBJECTIVE: To study and compare the operative results of the early and late treatment of orbital blow-out fracture. METHODS: Orbital blow-out fractures were reconstructed and repositioned. Three dimensional measurements, CT scanning, diplopia analysis, Medpor filling of the orbit were used for the operation and the study. The operative results were compared between 15 cases of early and 16 cases of late reconstruction of blow-out fracture. RESULTS: In the early treatment group, there were 8 cases of diplopia, 15 cases of orbital invagination and 10 cases of disesthesia of the infraorbital nerve. After surgery, diplopia was corrected in 7 cases; invagination was corrected in all the 15 cases; disesthesia of the infraorbital nerve was corrected in 8 cases. In the late treatment group, there were 10 cases of diplopia, 16 cases of orbital invagination and 9 cases of disesthesia of the infraorbital nerve. After surgery, diplopia was corrected in 3 cases, unimproved in 4 cases, aggravated in 2 cases. 5 of them received reoperation of extraocular muscle for diplopia. Orbital invagination was uncorrected in 3 cases. 2 of them were re-operated on. Disesthesia of the infraorbital nerve was unimproved in 2 cases. By comparing the operation results, of the two groups using FISHER accuracy inspection, the significant difference was only in the correction of the double visions (chi 2 = 4.865, P < 0.05). CONCLUSION: Early operation for orbital blow-out fracture is easier, with better results, fewer complications and reoperations than the late operation.