The present disclosure provides a method of preparing a coated electroactive material. The method includes providing a plurality of particles including an electroactive material. The method further includes coating the plurality of particles with a conductive polymer. The coating includes preparing a solution of water and the conductive polymer. The coating further includes forming a slurry by combining the solution with the plurality of particles. The method further includes drying the slurry to form the coated electroactive material. The coated electroactive material includes the plurality of particles. Each of the plurality of particles is at least partially coated with the conductive polymer. In certain aspects, the present disclosure provides a method of preparing an electrode including the coated electroactive material.

A process can be used to produce a charge storage unit, especially a secondary battery, the electrodes of which contain an organic redox-active polymer, and which includes a polymeric solid electrolyte. The solid electrolyte is obtained by polymerizing from mixtures of acrylates with methacrylates in the presence of at least one ionic liquid, which imparts advantageous properties to the charge storage unit.

The present disclosure relates to a multilayer negative electrode comprising a negative electrode current collector configured to transfer electrons between an outer lead and a negative electrode active material, a first negative electrode mixture layer formed on one surface or both surfaces of the current collector and containing natural graphite as a negative electrode active material and a second negative electrode mixture layer formed on the first negative electrode mixture layer and containing artificial graphite as a negative electrode active material, and a lithium secondary battery including the same.

An active material powder that includes a foreign particle and an active material particle is prepared. A first electrode material that includes the active material powder is prepared. Dry classification treatment is performed on the first electrode material, and thereby the foreign particle included in the first electrode material is decreased. An active material layer that includes the first electrode material after the dry classification treatment is formed. The first electrode material is in powder form. The foreign particle includes a metal foreign object and is a coarse particle.

There is provided a composite comprising a) a short chain sulfur; and b) a carbon-supported conductive polymer such as polyacrylonitrile, wherein sulfur atoms of said short chain sulfur are covalently linked to the conductive polymer of said carbon-supported conductive polymer via a C—S bond. A method of preparing said composite comprising polymerizing a plurality of monomers in the presence of a carbon scaffold, mixing elemental sulfur and heating the mixture to obtain said composite is also disclosed. An electrochemical cell comprising said composite as cathode, a sodium anode and a liquid electrolyte such as sodium trifluoromethanesulfonate dissolved in a mixture of solvents is disclosed.

An electrode assembly includes a first electrode plate, a second electrode plate, and a separator disposed between the first electrode plate and the second electrode plate. The first electrode plate includes a first active material layer and a second active material layer provided along the length of the electrode plate. A lithium ion diffusion rate of the first active material layer is greater than a lithium ion diffusion rate of the second active material layer.

An all-solid-state battery capable of improving capacity retention thereof is provided. In the all-solid-state battery having an anode active material layer, the anode active material layer contains an anode active material, a binder obtained from a material having a double bond, and a conductive material containing a material having a needle-like structure, 5 vol % to 20 vol % of the anode active material layer is the binder, and the ratio of the conductive material to the binder in terms of volume is 0.4 to 1.0.

This application provides a secondary battery, including at least one battery unit assembly. The battery cell assembly includes a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate. An elongation rate of the separator is greater than 100%, the elongation rate of the separator includes an elongation rate in the length direction and/or an elongation rate in the width direction, a ratio of the elongation rate of the separator to a thickness of the active material layer of the positive electrode plate and/or negative electrode plate is 3.0%/.Math.m to 8.0%/.Math.m, and a ratio of the elongation rate of the separator to an elongation rate of the current collector of the positive electrode plate and/or negative electrode plate is greater than or equal to 60.

An anode for a lithium secondary battery according to an embodiment of the present invention includes an anode current collector, a primer layer formed on a surface of the anode current collector, and an anode active material layer including a first anode active material layer and a second anode active material layer sequentially disposed on the primer layer. Each of the first anode active material layer and the second anode active material layer includes a silicon-based active material. A ratio of a content of the silicon-based active material in the second anode active material layer relative to a content of the silicon-based active material in the first anode active material layer among a total content of the silicon-based active material included in the anode active material layer is greater than 1.25 and less than 5.

In conventional arts, it is impossible to form a good solid-solid interface in cathode mixture layers of all-solid-state batteries, which significantly deteriorates resistance of the all-solid-state battery after the charge/discharge cycle, which is problematic. A cathode slurry is produced by a method including: a first step of dispersing a conductive additive constituted of carbon in a solvent to obtain a first slurry; a second step of dispersing a sulfide solid electrolyte in the first slurry to obtain a second slurry; and a third step of dispersing a cathode active material in the second slurry to obtain a third slurry, to be used to form a cathode mixture layer. This may suppress agglomeration of the cathode active material as using the conductive additive as a core, and may lower the proportion of agglomerate present in the cathode mixture layer. As a result, a good solid-solid interface may be formed in the cathode mixture layer of the all-solid-state battery, and the resistance increase of the all-solid-state battery after the charge/discharge cycle may be suppressed.