Systems and methods are provided for an electrode for a lithium-ion battery cell. In one example, the electrode may include a current collector having two opposing sides, at least one of the two opposing sides being configured with a first coating layer disposed on the current collector at a first loading, where the first coating layer may include a first binder in a first weight ratio, and a second coating layer disposed on the first coating layer at a second loading, where the second coating layer may include a second binder in a second weight ratio, wherein the first weight ratio may be greater than the second weight ratio, and a ratio of the first loading to the second loading may be less than 1:2. In this way, direct current internal resistance of the lithium-ion battery cell may be decreased while maintaining or increasing adhesion within the electrode.

Disclosed herein is a method of recovering lithium or sodium from an active material of a lithium or sodium ion battery. In a preferred embodiment, the method comprises a redox-targeting reaction of a used active material LiFeP04 with a redox mediator [Fe(CN).sub.6].sup.3− in a tank to produce lithium ions, circulating the reacted redox solution into a cell to regenerate said redox mediator and enabling said lithium ions to migrate through a membrane towards a cathode wherein said lithium ions are captured as LiOH through an electrochemical reaction.

There is provided a positive electrode material for a lithium-sulfur battery, including a sulfur-rich polymer and graphene, wherein an internal structure of the sulfur-rich polymer is an interpenetrating network structure; the graphene is doped in the sulfur-rich polymer; a particle size of the sulfur-rich polymer is 100-300 meshes; and the number of flake layers of the graphene is 2-10. A preparation method includes: crushing a prepared sulfur-rich polymer into powder, adding a solvent to obtain a solution, performing sufficient stirring processing; performing ultrasonic dispersion on graphene in a solvent to generate a suspension; and mixing the two solutions, then continuing to perform ultrasonic dispersion and stirring, and finally removing the solvent and drying a product to obtain the positive electrode material for a lithium-sulfur battery. The positive electrode material for a lithium-sulfur battery has relatively high conductivity and cycle performance and a long service life, and is simple to operate.

An object of the present disclosure is to provide a secondary battery having excellent cyclability by using a sulfur-based active material as a negative-electrode active material while preventing a reaction between an eluted polysulfide and a positive electrode. The metal-ion secondary battery comprises a negative electrode comprising a sulfur-containing compound as a negative-electrode active material, a positive electrode and an electrolyte, and has a polymer gel layer on a surface of the positive electrode.

An object of the present disclosure is to provide a secondary battery having excellent cyclability by using a sulfur-based active material as a negative-electrode active material while preventing a reaction between an eluted polysulfide and a positive electrode. The metal-ion secondary battery comprises a negative electrode comprising a sulfur-containing compound as a negative-electrode active material, a positive electrode and an electrolyte, and has a polymer gel layer on a surface of the positive electrode.

The present technology relates to self-standing electrodes, their use in electrochemical cells, and their production processes using a water-based filtration process. For example, the self-standing electrodes may be used in lithium-ion batteries (LIBs). Particularly, the self-standing electrodes comprise a first electronically conductive material serving as a current collector, the surface of the first electronically conductive material being grafted with a hydrophilic group, a binder comprising cellulose fibres, an electrochemically active material, and optionally a second electronically conductive material. A process for the preparation of the self-standing electrodes is also described.

The present technology relates to self-standing electrodes, their use in electrochemical cells, and their production processes using a water-based filtration process. For example, the self-standing electrodes may be used in lithium-ion batteries (LIBs). Particularly, the self-standing electrodes comprise a first electronically conductive material serving as a current collector, the surface of the first electronically conductive material being grafted with a hydrophilic group, a binder comprising cellulose fibres, an electrochemically active material, and optionally a second electronically conductive material. A process for the preparation of the self-standing electrodes is also described.

A negative electrode material includes a composite matrix material and a carbon coating coated on the composite matrix material. The composite matrix material includes lithium silicate, silicon oxide, an activator, and silicon embedded in the lithium silicate and the silicon oxide.

A method of making an ionically conductive layer for an electrochemical device is disclosed. A film is coated on electrode material particles or post-calendered electrodes. This coating may be a lithium borate-carbonate film deposited by atomic layer deposition. One example method includes the steps of: (a) exposing a substrate including an electrode material to a lithium-containing precursor followed by an oxygen-containing precursor; and (b) exposing the substrate to a boron-containing precursor followed by the oxygen-containing precursor.

A composition of matter suitable for usage as a formative material for a lithium-sulfur battery cathode is provided. The composition of matter may include a carbon structure formed by multiple carbon particles interconnected to one another. Each carbon particle may include pores and exposed surfaces. In this way, an electrically conductive material (ECM) (e.g., silver and/or antimony) may be deposited in the pores and coated (e.g., conformally coated) on the exposed surfaces of respective carbon particles. In addition, at least some carbon particles may disintegrate and provide exposed surfaces prior to deposition of the ECM. For example, disintegrated carbon particles may have a greater surface-area-to-volume ratio than whole carbon particles, thereby providing an increased amount of surface area available for subsequent ECM deposition. In addition, in some aspects, an active material may be infiltrated in one or more carbon particles and pores.