The present application provides an electrode assembly, including a negative electrode plate and a positive electrode plate, the negative electrode plate and the positive electrode plate being wound in a winding direction to form a winding structure including a bending area. Both the negative and the positive electrode plates include a plurality of bending portions located in the bending area. At least one bending portion in the negative electrode plate is a first bending portion, and an active substance capacity per unit area outside the first bending portion is greater than an active substance capacity per unit area inside the first bending portion; and/or, at least one bending portion in the positive electrode plate is a second bending portion, and an active substance capacity per unit area outside the second bending portion is greater than an active substance capacity per unit area inside the second bending portion.

An electrode structure of a flow battery. A density of the vertical tow in the electrode fiber is larger than the density of the parallel tow. In the electrode fiber per unit volume, the quantity ratio of the vertical tow to the parallel tow is at least 6:4. The electrode structure includes an odd number of layers of the electrode fibers, and the porosity of other layers is larger than that of the center layer. The electrode structure includes the vertical tows, so that, the contact area between the outer surface of the electrode and the adjacent component is increased and the contact resistance is reduced; the electrode has good mechanical properties; the contact resistance of such structure is reduced by 30%-50%; and the layers of the electrode have different thickness depending on the porosity. After compression, the layers with optimized thickness have a consistent porosity.

The present disclosure provides a composite material comprising an electrically conductive polymer, such as poly(3,4-ethylenedioxythiophene) (PEDOT) and an ionically conductive polymer, such as poly(ethylene oxide) (PEO). This composite forms a dual conductor for three-dimensional electrodes in electrochemical applications including lithium ion batteries.

An electrochemical voltage source has an anode containing lithium, a cathode containing manganese oxide, and a housing. The cathode and the anode are arranged in an interior of the housing and are arranged opposite one another. An electrolyte reservoir in the form of a compressible storage body, which receives an electrolyte, is arranged between the anode and the cathode. The storage body has a first side resting against an end face of the cathode and a second side, which faces away from the first side, and rests against an end face of the anode. The cathode experiences an increase in volume when the voltage source is discharged. The anode experiences a decrease in volume during the discharge. During the discharge, the absolute value of the volume increase of the cathode is at least as great as the absolute value of the volume decrease of the anode.

A method of preparing a slurry composition for a secondary battery positive electrode includes preparing a positive electrode active material pre-dispersion by mixing a lithium iron phosphate-based positive electrode active material, a dispersant, and a solvent, and preparing a slurry for a positive electrode by further mixing a conductive agent, a binder, and an additional solvent with the positive electrode active material pre-dispersion is provided. A positive electrode for a secondary battery which is prepared by using the same method, and a lithium secondary battery including the positive electrode are also provided.

A method of preparing a slurry composition for a secondary battery positive electrode includes preparing a positive electrode active material pre-dispersion by mixing a lithium iron phosphate-based positive electrode active material, a dispersant, and a solvent, and preparing a slurry for a positive electrode by further mixing a conductive agent, a binder, and an additional solvent with the positive electrode active material pre-dispersion is provided. A positive electrode for a secondary battery which is prepared by using the same method, and a lithium secondary battery including the positive electrode are also provided.

A composite sulfide electrode and a manufacturing method therefor are disclosed. A method for manufacturing a composite sulfide electrode comprises the steps of: preparing a mixed solution of polyacrylonitrile (PAN) and a metallic oxide; stirring the prepared mixed solution; electrospinning the stirred mixed solution to prepare a wire-type precursor bearing a metallic oxide in PAN; drying the prepared wire-type precursor; mixing the dried wire-type precursor and a sulfur powder; and injecting a gas to the mixture of the wire-type precursor and the sulfur powder to sulfurize the wire-type precursor.

A composite sulfide electrode and a manufacturing method therefor are disclosed. A method for manufacturing a composite sulfide electrode comprises the steps of: preparing a mixed solution of polyacrylonitrile (PAN) and a metallic oxide; stirring the prepared mixed solution; electrospinning the stirred mixed solution to prepare a wire-type precursor bearing a metallic oxide in PAN; drying the prepared wire-type precursor; mixing the dried wire-type precursor and a sulfur powder; and injecting a gas to the mixture of the wire-type precursor and the sulfur powder to sulfurize the wire-type precursor.

An electrochemical cell has a cathode having a cathode current collector and a cathode active material, an anode having an anode current collector and an anode active material comprising lithium metal, a liquid electrolyte, a separator between the cathode active material and the anode active material, and a polymer electrolyte lamination layer bonding the anode to the separator. The polymer electrolyte lamination layer is formulated using a crosslinked polymer, a lithium salt, a plasticizer, and an anode additive.

An electrochemical cell has a cathode having a cathode current collector and a cathode active material, an anode having an anode current collector and an anode active material comprising lithium metal, a liquid electrolyte, a separator between the cathode active material and the anode active material, and a polymer electrolyte lamination layer bonding the anode to the separator. The polymer electrolyte lamination layer is formulated using a crosslinked polymer, a lithium salt, a plasticizer, and an anode additive.