52results about How to "Stable electrode structure" patented technology

The invention provides silicon-based and tin-based composite particles for a lithium ion battery and a preparation method thereof and negative electrode and a lithium ion battery containing the silicon-based and tin-based composite particles. The silicon-based and tin-based composite particles are characterized by being prepared from hollow tin particles or hollow tin oxide particles and a siliconlayer coating the outer surfaces of the hollow tin particles or hollow tin oxide particles. The invention also provides the negative electrode containing the composite particles and applied to a lithium ion secondary battery, and the lithium ion secondary battery with the negative electrode. The preparation method of the composite particles is simple; due to the hollow structure, the particles can effectively accommodate the volume expansion of silicon-based and tin-based materials in a lithium intercalation process, so as to maintain stability of the electrode structure. Moreover, an external silicon-based material can effectively prevent agglomeration of nano tin particles and maintain stability of a tin-based material, so as to obtain a lithium ion battery negative electrode compositematerial with great specific capacity and good cycle performance.

The invention provides a preparation method of calcium terephthalate, an organic negative electrode material, and its application in lithium ion batteries. The preparation method of calcium terephthalate comprises the following steps: 1) terephthalic acid reacts with LiOH or NaOH or KOH to generate terephthalate solution; 2) terephthalate solution and CaCl2 or Ca(NO3) 2 reactions to obtain a mixed solution containing calcium terephthalate; 3) separate the mixed solution, and dry the separated solid to obtain calcium terephthalate containing three waters of crystallization; 4) mix the solution containing three waters of crystallization Calcium terephthalate is dried in a vacuum drying oven to remove crystal water to obtain calcium terephthalate. The reversible specific capacity of calcium terephthalate obtained by the present invention is as high as 231mAh / g, and it has excellent stability in the electrolyte, good rate performance, slow specific capacity decay, and a capacity retention rate of up to 93% after 120 cycles of circulation, which is a performance Excellent organic anode materials for lithium-ion batteries.

The invention discloses a silicon-carbon composite cathode material with a three-dimensional preformed hole structure and a preparation method thereof. According to the composite cathode material, a carbon material having high electric conductivity and a stable structure is used as a matrix for dispersedly containing high-volume silicon particles, and proper three-dimensional expansion spaces are reserved around one or several silicon particles. The preparation method comprises the following steps of: carrying out surface modification on the silicon particles; coating the silicon particles by silicon dioxide; coating the silicon dioxide / silicon composite particles by carbon source precursors; carrying out high-temperature carbonization treatment; and removing a silicon dioxide template, and the like. When the composite material prepared by the preparation method is used for a lithium ion battery, the reversible specific capacity is high, and the cycle performance is excellent. The silicon-carbon composite cathode material has the advantages of simple preparation process and wide raw material resource and is suitable for industrial production.

The present invention provides a borate compound and a preparation method thereof, and a lithium ion battery electrolyte including the borate compound. The S-containing heterocycles in the boric acid ester compound provided by the present invention, such as thienyl and aryl groups, have the characteristics of being polymerized into a film at the positive electrode. High temperature performance of the battery. In addition, the polymer film can stabilize the electrode structure, inhibit the dissolution of transition metals, reduce side reactions at the interface between the positive electrode and the electrolyte, and improve the electrochemical performance and safety performance of the battery.

The invention discloses a polymer electrolyte and a preparation method and application thereof, wherein the polymer electrolyte comprises a polymer matrix, and the polymer matrix is ​​composed of three blocks of acryl, urethane and phosphate. The polymer formed by the self-polymerization of the polymerized monomer, or the polymer formed by the copolymerization of the polymerized monomer composed of the three building blocks of acryl, urethane and phosphate ester and other monomers. The polymer electrolyte can be used in a battery, and the polymer matrix can undergo a self-crosslinking reaction at a high temperature of 130-190° C. to generate a dense thermosetting polymer that can cut off ion transport and prevent the occurrence of thermal runaway of the battery; and The self-crosslinking reaction is an endothermic reaction, which helps to quickly reduce the battery temperature and prevent the battery from thermal runaway; the polymer electrolyte can also capture free radicals and has intrinsic flame retardancy; the above characteristics of the polymer matrix act synergistically , which can effectively prevent the occurrence of thermal runaway of the battery.

The invention provides an in-situ generated cross-linked type lithium ion battery anode material adhesive which is a cross-linking product PM-PG of polyethylene maleic anhydride and propylene glycol alginate. The invention furthermore provides a preparation method of the cross-linked type lithium ion battery anode material adhesive. The preparation method comprises the following steps: dissolvingpolyethylene maleic anhydride and propylene glycol alginate into a solvent, and carrying out stirring at the room temperature to carry out a reaction, so as to obtain an adhesive solution. The invention furthermore provides a lithium ion battery anode material which consists of an active component, a conductive material and the cross-linked type lithium ion battery anode material adhesive. The invention furthermore provides a lithium ion secondary battery which comprises the lithium ion battery anode material. The cross-linked type lithium ion battery anode material adhesive provided by the invention comprises multiple polar bonds such as hydroxyl and carboxyl, and has good adhesiveness; and the cross-linked type lithium ion battery anode material adhesive provided by the invention has a 3D cross-linking network, and is capable of well covering active materials and conductive materials, and thus an electrode structure can be stabilized.

The invention discloses a preparation method of a multilevel structure titanate negative electrode material for a lithium ion battery, and belongs to the technical field of lithium ion batteries. Themethod concretely comprises the following steps: dispersing a sodium source and a titanium source in a glycol and anhydrous ethanol mixed solution to form a solution A; dissolving a barium source in an aqueous solution of anhydrous ethanol to form a solution B; mixing and stirring the solution A and the solution B, heating the obtained solution until evaporative drying is achieved, placing the obtained precursor in a muffle furnace, and carrying out pre-calcining, ball milling and calcining to obtain a BaNa2Ti6O14 material; dispersing the material in an acetone solution, adding carbon nano-tubes, and stirring and heating the obtained solution until the solution is completely volatilized in order to obtain BaNa2Ti6O14-CNT; and carrying out mixing and ball-milling on the BaNa2Ti6O14-CNT andcarbon fibers, and sintering the obtained mixture in nitrogen to obtain the target product. The titanate negative electrode material obtained in the invention has a stable multilevel composite structure, so the titanate negative electrode material has the advantages of considerable wide potential window reversible capacity, excellent rate performances and stable cycle life.

The invention belongs to the field of preparation of silicon-carbon negative electrode materials, and specifically discloses a silicon-carbon composite material based on low-oxygen porous silicon, which includes silicon-carbon composite particles and carbon component a; the silicon-carbon composite particles include amorphous carbon Substrate and small-diameter carbon particles b and low-oxygen porous silicon particles compounded in the substrate; the low-oxygen porous silicon particles include a core and a shell compounded on the surface of the core; wherein the core is locally amorphized Low-oxygen porous silicon SiO y ;The shell is a thin carbon coating; where, 0

The invention relates to a silicon-carbon-polymer composite electrode for a lithium secondary battery and a preparation method thereof, belonging to the technical field of negative electrode materials for lithium secondary batteries. The composite electrode is composed of cyclized conductive polyacrylonitrile chemically coated with nano-silicon to form a core-shell structure, and then compounded with graphite carbon material. Micron silicon and polyacrylonitrile (PAN) are ball-milled to form a nanocomposite, and the obtained composite and graphite are added to the PAN dimethylformamide (DMF) solvent and stirred evenly, and then the mixture is placed inert after drying Heat treatment in the atmosphere to obtain the final composite electrode material. The electrode material has high electrical conductivity, good chemical stability and structural stability. The preparation method is simple, the raw material cost is low, and large-scale production is easy to realize.