of the most attractive inventions because they have dramatically improved our daily lives by enabling portable electronics, the onset of electronic mobility and electrical vehicles. [1] With the development of materials science, anionic redox chemistry, typically O redox, has enabled more energy storage than the traditional electrochemical reactions, in which the energy and power density are solely determined by the cation redox reaction of transition metals. [2] On the other hand, the rapid growth of lithium consumption leads to continuously increasing demand for lithium. Considering the uneven distribution of lithium resources, the inherent drawbacks of lithium supply and demand are difficult to overcome. [3] Therefore, an alternative to lithium must be considered, especially for large-scale energy storage applications in the foreseeable future.The Na-ion battery, which has a reaction pattern comparable with that of the Li-ion battery, is one of the promising alternatives because of its low cost and the abundance of sodium resources. [4] Currently, the study of Na-ion batteries is focused on improving their energy density. Considering the successful study of Lirich materials, one of the possible solutions to improve the capacity of Na-ion batteries is to develop Na-rich materials. It is very important to involve reversible O redox and expand the material series from the material design point of view.Recent research disclosed, the increasing of the Li(Na) content within layered structure materials can effectively influence the local atom coordination around oxygen atoms which could improve O redox upon cycling and lead to a higher capacity. [5] As demonstrated by Tarascon and Ceder et al., increasing the Li(Na) ratio can shift the O 2p nonbonding band gradually up near the Fermi level. This labile nonbonding O offers an extra way for electrons to move away, hence increasing the capacity by triggering an extra redox process. [2e,5c,6] This explanation has been successfully applied to Li 2 MnO 3 Li-rich materials [7] and is widely agreed upon. Benefitting from the established Li 2 MnO 3 Li-rich prototype, Li-rich material development has highly improved during the past decades, achieving additional capacity. [8] For the counterpart Na-ion battery design, although anionic redox was recently realized in the Mn-based To improve the energy and power density of Na-ion batteries, an increasing number of researchers have focused their attention on activation of the anionic redox process. Although several materials have been proposed, few studies have focused on the Na-rich materials compared with Li-rich materials. A key aspect is sufficient utilization of anionic species. Herein, a comprehensive study of Mn-based Na 1.2 Mn 0.4 Ir 0.4 O 2 (NMI) O3-type Na-rich materials is presented, which involves both cationic and anionic contributions during the redox process. The single-cation redox step relies on the Mn 3+ /Mn 4+ , whereas Ir atoms build a strong covalent bond with O and effectively suppress the O 2 release....

Laparoscopic repair (LR) for perforated peptic ulcer (PPU) has been introduced since 1990. Although many studies comparing LR with open repair (OR) have been published, controversy remains regarding the clinical utility of laparoscopic techniques for the treatment of PPU. Thus, it is necessary for us to broaden our knowledge on this subject with the newly published articles. Twenty-four nonrandomized controlled studies (NRS) and five randomized controlled trails (RCTs) were included in our meta-analyses, which comprised 5,268 patients (1,890 in the LR group and 3,378 in the OR group). In the analysis of high quality NRS and RCTs, compared with OR, high quality evidence suggested that LR was associated with a lower incidence of overall postoperative complications; moderate evidence showed that the two procedures had the similar reoperation rate; based on the low quality evidence, LR had reduced hospital mortality and similar operative time; Moreover, LR was observed having the advantages of earlier resumption of oral intake, shorter hospital stay and less analgesic use, which were supported by very low evidence. All the evidences suggest that LR is better than OR for PPU, but more high-quality RCTs are still needed for further validation.

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ObjectiveTo expand the current knowledge on the feasibility and safety of laparoscopic total gastrectomy (LTG) for gastric cancer in comparison with open total gastrectomy (OTG).BackgroundAdditional studies comparing laparoscopic versus open total gastric resection have been published, and it is necessary to update the meta-analysis of this subject.MethodsOriginal articles compared LTG and OTG for gastric cancer, which published in English from January 1990 to July 2013 were searched in PubMed, Embase, and Web of Knowledge by two reviewers independently. Operative time, blood loss, harvested lymph nodes, proximal resection margin, analgesic medication, first flatus day, first oral intake, postoperative hospital stay, postoperative complications, hospital mortality, 5-year overall survival (OS) and disease-free survival (DFS) were compared using STATA version 10.1.Results17 studies were selected in this analysis, which included a total of 2313 patients (955 in LTG and 1358 in OTG). LTG showed longer operative time, less blood loss, fewer analgesic uses, earlier passage of flatus, quicker resumption of oral intake, earlier hospital discharge, and reduced postoperative morbidity. The number of harvested lymph nodes, proximal resection margin, hospital mortality, 5-year OS and DFS were similar.ConclusionLTG had the benefits of less blood loss, less postoperative pain, quicker bowel function recovery, shorter hospital stay and lower postoperative morbidity, at the price of longer operative time. There were no statistical differences in lymph node dissection, resection margin, hospital mortality, and long-term outcomes, which indicated the similar oncological safety with OTG. A positive trend was indicated towards LTG. So LTG can be performed as an alternative to OTG by the experienced surgeons in high-volume centers. Whereas, due to the relative small sample size of long-term outcomes and lack of randomized control trials, more studies are required.

The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/aenm.201900189. Na-Ion BatteriesThe fast development of electrochemical energy storage, especially the wild application of Li-ion batteries, has facilitated today's portable electronic equipment and is essential for realizing the hybrid and electrical vehicles. [1] Nevertheless, the state-of-the-art Li-ion batteries still could not meet the requirement of large scale energy storage since it suffered from the

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