Lithium-ion batteries (LIBs) have attracted considerable attention due to their wide applications, such as in portable electronic devices, implantable medical devices, and electric vehicles (EVs). [ 1 ] To meet the constantly increasing demands of upcoming electronic devices, new LIBs require substantial improvements in energy capacity, cycling stability, and rate capability of both the cathode and anode materials. [ 2,3 ] Among cathode materials for LIBs, orthorhombic vanadium pentoxide (V 2 O 5 ) the most stable form in the vanadium oxide family, has gained great interest due to its high energy density, low cost, abundant sources, and good safety properties. [4][5][6][7] The theoretical capacity of V 2 O 5 with two Li intercalations/ deintercalations is about 294 mA h g − 1 , much higher than those of more commonly used cathode materials, making it a very promising cathode material for next-generation LIBs. However, the practical use of V 2 O 5 as cathode materials for LIBs has been hampered due to its poor cycling stability, low electronic and ionic conductivity, and slow electrochemical kinetics. [8][9][10] To overcome these problems, decreasing their particle size to nanoscale level is generally believed to be one of the most effective approaches due to the shorter transport lengths for both electrons and Li ions, larger electrode/electrolyte contact area, and better accommodation of the strain of Li intercalation/deintercalation in nanomaterials. [ 11 , 12 ] The unique performance of nanomaterials lies in their large specifi c surface and favorable structural properties. 2D nanosheets often possess large exposed surfaces and specifi c facets, which make them more attractive in energy conversion devices. [ 13 ] 2D structures are ideal frameworks for fast Li storage, which requires stability, large active surface area, and short transport path for Li intercalation/deintercalation. [ 14 ] There have been many researches on nanostructured V 2 O 5 materials for LIBs. [ 4-7 , 15-20 ] However, there are few reports on 2D nanostructured V 2 O 5 for LIBs. The only report on 2D nanostructured V 2 O 5 was that Zhang's group prepared large-area pure V 2 O 5 nanosheets by dissolution-splitting method from their parent bulk cyrstal using ammonium persulfate as intercalated compound. [ 21 ] The method is a typical top-down method. The as-prepared product exhibits enhanced lithium storage properties including high reversible capacity, good cycling, and rate performance.In this communication, we demonstrate a novel and facile green method to prepare 2D leaf-like V 2 O 5 nanosheets as illustrated in Figure 1 . V 2 O 5 powders were reacted with H 2 O 2 in combination with ultrasonic treatment to generate V 2 O 5 gel. Then the V 2 O 5 gel was diluted, freeze-dried, and further treated at 450 ° C in air to obtain V 2 O 5 nanosheets. Used as cathode material for LIBs, this 2D leaf-like V 2 O 5 nanosheets exhibits excellent Li storage properties, including high reversible capacity, high rate capability, and good capacity reten...

Background and Purpose: The benefit of endovascular treatment (EVT) for large vessel occlusion in clinical practice in developing countries like China needs to be confirmed. The aim of the study was to determine whether the benefit of EVT for acute ischemic stroke in randomized trials could be generalized to clinical practice in Chinese population. Methods: We conducted a prospective registry of EVT at 111 centers in China. Patients with acute ischemic stroke caused by imaging-confirmed intracranial large vessel occlusion and receiving EVT were included. The primary outcome was functional independence at 90 days defined as a modified Rankin Scale score of 0 to 2. Outcomes of specific subgroups in the anterior circulation were reported and logistic regression was performed to predict the primary outcome. Results: Among the 1793 enrolled patients, 1396 (77.9%) had anterior circulation large vessel occlusion (median age, 66 [56–73] years) and 397 (22.1%) had posterior circulation large vessel occlusion (median age, 64 [55–72] years). Functional independence at 90 days was reached in 45% and 44% in anterior and posterior circulation groups, respectively. For anterior circulation population, underlying intracranial atherosclerotic disease was identified in 29% of patients, with higher functional independence at 90 days (52% versus 44%; P =0.0122) than patients without intracranial atherosclerotic disease. In the anterior circulation population, after adjusting for baseline characteristics, procedure details, and early outcomes, the independent predictors for functional independence at 90 days were age <66 years (odds ratio [OR], 1.733 [95% CI, 1.213–2.476]), time from onset to puncture >6 hours (OR, 1.536 [95% CI, 1.065–2.216]), local anesthesia (OR, 2.194 [95% CI, 1.325–3.633]), final modified Thrombolysis in Cerebral Infarction 2b/3 (OR, 2.052 [95% CI, 1.085–3.878]), puncture-to-reperfusion time ≤1.5 hours (OR, 1.628 [95% CI, 1.098–2.413]), and National Institutes of Health Stroke Scale score 24 hours after the procedure <11 (OR, 9.126 [95% CI, 6.222–13.385]). Conclusions: Despite distinct characteristics in the Chinese population, favorable outcome of EVT can be achieved in clinical practice in China. Registration: URL: https://www.clinicaltrials.gov . Unique identifier: NCT03370939.

The electronic and ionic conductivity of Li4Ti5O12 can be simultaneously improved via a facile cost-saving carbothermal reduction method.

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Manganese sulfide (MnS), a member of transition metal sulfides, has been considered as a promising anode material for reversible Li storage due to its high theoretical capacity and structural advantages. However, the intrinsic electrochemical performance of MnS with different phases in lithium-ion batteries is yet to be fully investigated. Herein, high purity rock-salt (RS), zinc-blende (ZB) and wurtzite (WZ) MnS nanocrystals with different morphologies were successfully synthesized via a facile solvothermal method. The RS-MnS, ZB-MnS and WZ-MnS electrodes showed the capacities of 232.5 mAh g -1 , 287.9 mAh g -1 and 79.8 mAh g -1 at the 600th cycle, respectively. ZB-MnS displayed the best performance in terms of specific capacity and cyclability in comparison to RS-MnS and WZ-MnS nanocrystals. Interestingly, all the three kinds of MnS electrodes exhibited an unusual phenomenon of capacity increase upon cycling along with reduced particle sizes and without change in crystallinity. The main contribution of capacity increase was ascribed to the decreased cell resistance and enhanced interfacial charge storage, which facilitated more effective Li + diffusion into electrode materials.