Abstract: A negative electrode active material, a negative electrode plate and a secondary battery. The negative electrode active material comprises a chelating resin and a metal ion. The chelating resin comprises a polymer skeleton and a chelating functional group. The chelating functional group is fixedly connected to the polymer skeleton via a chemical bond. The metal ion is connected with the chelating resin by an ionic bond and/or a coordinate bond via the chelating functional group. The chelating resin further comprises a free small molecular compound containing the chelating functional group. In the chelating resin, a mass percentage of the free small molecular compound containing the chelating functional is less than or equal to 1%. The metal ion is a divalent or multivalent metal ion. When the negative electrode active material is applied to the secondary battery, the secondary battery can achieve both high coulombic efficiency and high cycle stability.

Abstract: The present disclosure provides a solution for migrating data. In the solution, a migration tool first receives, from a source server, an index having index values corresponding to a plurality of files stored at the source server. The migration tool then retrieves a location of an index value corresponding to key information file in the index. The migration tool sorts the index based on the retrieved location. The migration tool processes the plurality of files based the sorted index, such that the sorted index causes the key information file to be processed last.

Abstract: The present disclosure provides a positive electrode plate and an electrochemical battery. The positive electrode plate comprises a positive electrode current collector and a positive electrode film. The positive electrode film is provided on the positive electrode current collector and comprises a positive electrode active material and a binder. The positive electrode active material comprises a prussian blue analogue material, the binder is an oil-soluble binder, an area density of the positive electrode film is 5 mg/cm2˜30 mg/cm2. In the positive electrode film of the present disclosure, the prussian blue analogue material is used together with the oil-soluble binder, and the area density of the positive electrode film is controlled within a certain range, so that introduction of the water molecule can be reduced during the preparation process and coating process of a positive electrode slurry, and cycle performance of the electrochemical battery can be improved.

Abstract: The present disclosure provides a positive electrode plate, a preparation method thereof and a sodium-ion battery. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material film. The positive electrode active material film provided on the positive electrode current collector and comprises a positive electrode active material. The positive electrode active material comprises a prussian blue analogue material, a molecular formula of the prussian blue analogue material is AxM[M?(CN)6]y, a water content of the positive electrode active material film is 100 ?g/g˜5000 ?g/g. The water content of the positive electrode active material film is controlled within a certain range, which can not only ensure the sodium-ion battery do not seriously swell during charge-discharge process, but also can ensure sodium-ion battery have excellent charge-discharge performance and cycle performance.

Abstract: The present disclosure provides a polymer protecting layer, a lithium metal negative electrode, a lithium secondary battery. In the lithium secondary battery of the present disclosure, a polymer protecting layer comprising a polymer ionic liquid is coated on a surface of a lithium metal sheet.

Abstract: The present disclosure provides a polymer protecting layer, a lithium metal negative electrode, a lithium secondary battery. In the lithium secondary battery of the present disclosure, a polymer protecting layer comprising a polymer ionic liquid is coated on a surface of a lithium metal sheet, which can effectively slow down or even inhibit the growth of the lithium dendrite, improve the first charge-discharge cycle coulombic efficiency of the lithium secondary battery, and significantly improve the cycle performance and the safety performance of the lithium secondary battery.

Abstract: An electrolyte for a magnesium cell contains a solute, which is phenoxyl-Mg—Al-halogen complex, and an ether solvent. With respect to the entire electrolyte, the solute concentration is 0.2 to 1 mol/L. The electrolyte is capable of staying stable in the air. Also provided is a magnesium cell containing the electrolyte.

Abstract: A magnesium secondary battery includes a positive electrode, a negative electrode, a separator membrane and an electrolytic solution. The electrolytic solution includes nitrogen-containing heterocyclic magnesium halide and an organic ether solvent.

Abstract: An electrolyte for a magnesium cell contains a solute, which is phenoxyl-Mg—Al-halogen complex, and an ether solvent. With respect to the entire electrolyte, the solute concentration is 0.2 to 1 mol/L. The electrolyte is capable of staying stable in the air. Also provided is a magnesium cell containing the electrolyte.

Abstract: A magnesium battery electrolyte with a wide electrochemical window was developed. The electrolyte includes an organic boron magnesium salt and an aprotic polar solvent. The organic boron magnesium salt is an organic boron magnesium salt complex formed by compounding a Lewis acid with a boron center and a magnesium-containing Lewis base R?2-nMgXn, wherein n is 0 or 1, R and R? respectively represent a fluoroaryl group, an alkylated aryl group, an aryl group, an alkyl group, or a pyrrolidinyl group, and X represents a halogen. The solvent is an aprotic polar solvent such as ether or a mixed solvent thereof. The concentration of the electrolyte is 0.25 to 1 mol/L, and the electric conductivity is 0.5 to 10 mS/cm. The electrolyte allows reversible deposition/dissolution of magnesium, features good cycling stability, and has a wide electrochemical window (>3.0V vs.Mg/Mg2+).

Abstract: A magnesium secondary battery includes a positive electrode, a negative electrode, a separator membrane and an electrolytic solution. The electrolytic solution includes nitrogen-containing heterocyclic magnesium halide and an organic ether solvent.

Abstract: An apparatus and a method for implementing a flexible page layout. The apparatus includes: a page presentation unit, for providing at least one presentation mode of the page layout; a page control unit connected with the page presentation unit, for selecting resources supported by the user terminal, loading the resources to the page presentation unit, and generating a display page for providing to the user. The method includes: providing at least one presentation mode of the page layout; selecting resources supported by the user terminal, loading the resources according to the at least one presentation mode, and generating a display page. According to the invention, page layout diversification may be realized and various types of contents may be loaded in a page flexibly.