Conductive and Stretchable Binders for EV Battery Electrodes

Binder resin for lithium battery anodes and cathodes that enables long cycle life by reducing capacity fade in high-capacity materials like silicon. The binder is a high-elasticity polymer composite containing a cross-linked polymer matrix with dispersed conductive reinforcement. The elastic binder prevents particle expansion/contraction damage during charging/discharging. The cross-linked polymer network provides structural integrity and lithium-ion conductivity. The elasticity allows reversible deformation without fracture. The binder chemically bonds to the active material and current collector.

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Conductive polymer binders for lithium ion battery cathodes that improve performance by binding the electrode materials structurally and also conducting ions and electrons. The binders are complexes of oppositely charged conjugated polymers and polyelectrolytes. The electrostatic interaction between the oppositely charged side chains enables properties like binding, ionic and electrical conductivity, insolubility in the battery electrolyte, stability, and processability.

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A lithium battery anode with improved cycle life for high-capacity anode materials like silicon or tin. The anode active layer contains high-capacity anode particles bonded together using a unique binder resin. The binder resin has a high-elasticity polymer with recoverable strain over 5% and lithium ion conductivity over 10^-5 S/cm. This polymer allows expansion/contraction of the high-capacity anode particles during charge/discharge without cracking or delamination.

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A high capacity lithium ion battery with improved cycling performance and reduced cracking by using an ionic crosslinked polymer binder with conductive properties. The binder is made of a viscous polymer like an ionomer with carboxyl groups and an amine-containing compound, which crosslink through ionic interaction and hydrogen bonding. This forms a tough and firm network that tightly coats the active material without adding a separate conductive agent. The binder contains both an elastic polymer network and a ductile conductive network, providing better binding of the active material in thick electrodes to prevent cracking and capacity fade.

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A binder for lithium-ion battery electrodes that improves adhesion to active materials like silicon and enables better cycle life. The binder contains a first polymer with hydroxyl and carboxyl groups to bond with active materials, and a second polymer for electronic conductivity. The polymers have specific ratios to balance binding and conductivity. The first polymer forms a crosslinked network structure with active materials to prevent expansion and cracking. The second polymer coats the first polymer and provides ion and electron pathways.

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Electrode binder composition, electrode, secondary battery, and device with improved electrode adhesion and cycling performance for high capacity silicon-based anodes and cathodes in lithium batteries. The binder is a thermoplastic polyurethane made from a polyether alcohol, isocyanate, chain extender, and optional silane adhesion promoter. It has higher elasticity and better adhesion to current collectors compared to conventional binders like PVDF. The thermoplastic polyurethane binder enables the electrode active material to hold together better during cycling, reducing solvation and cracking compared to PVDF.

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Secondary battery with improved cycle life and reduced internal resistance for electric vehicles. The battery uses a composite binder containing an active material like Si, Sn, or C, a conductive matrix material, and an organic polymer. This composite binder is used in the negative electrode tab to bind the active material and matrix. It reduces expansion and delamination during cycling compared to conventional binders. The composite binder can be prepared by surface treatment, grafting, and solvent adjustment techniques.

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Secondary battery mixture, mixture sheet, and battery with improved performance and reduced binder content. The secondary battery mixture contains a binder made of fibrillated resin like PTFE with a median fiber diameter of 100 nm or less. This fine fibrillated binder provides binding without excess shear force. The low binder content allows more active material and conductive aid in the electrode. The mixture can be formed by powder mixing without solvent. The fibrillated binder improves powder filling and prevents agglomeration. The sheet form can be made by calendering or extrusion. The reduced binder content improves battery capacity, conductivity, and cycle life.

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Composite binder for lithium-ion battery electrodes that improves adhesion and conductivity compared to conventional dry-process binders. The composite binder is made by polymerizing a binder monomer, an organic acid monomer, and a conductive material monomer. This provides a polymer with binding, acidic functionality, and conductivity for improved electrode adhesion and cycle life, as well as lower internal resistance and better rate capability compared to traditional dry electrode binders.

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Electrode for lithium secondary batteries like Li-ion batteries and all-solid-state batteries that uses a fibrillated binder to minimize electron conduction path blocking. The fibrillated binder is made by applying shear stress to a mixture of active material and a binder powder that fibrillates when compressed. This fibrillated binder has lower density compared to normal binders. The fibrillated binder reduces short circuits by minimizing covering of active material and solid electrolyte surfaces compared to conventional binders.

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Highly elastic binder for all-solid-state batteries that minimizes electrode expansion and contraction during charging and discharging. The binder contains a polymer with carbonyl groups and a linker with amino groups at the ends. Some of the oxygen atoms in the carbonyl groups are replaced with nitrogen atoms from the amino groups, allowing crosslinking between the polymers. This crosslinked binder provides high elasticity to prevent internal defects during electrode expansion.

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Binder for lithium-ion batteries with improved cycle life and expansion performance for high expansion anode materials like silicon. The binder has specific ratios of anionic polymer and organic amine cationic polymer, and a targeted molar percentage of anionic monomers containing carboxyl or sulfonic groups. This composition balances crosslinking for strength with flexibility to prevent binder breakage during anode expansion. The binder also has a specific weight average molecular weight range for both polymers. The binder is used at 1-8% weight fraction in the anode active material layer.

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Method for manufacturing a negative electrode plate for lithium-ion batteries with improved cycle life and consistency by using a binder with compression elasticity. The binder is made from materials like styrenic block copolymers (SEBS), high impact polystyrene (HIPS), ethylene propylene rubber (EPR), and crosslinking agents like di(tert-butyl peroxy) diisopropylbenzene (BIPB) and dioctyl sebacate (DOS). This binder forms a three-dimensional network in the negative electrode coating that entangles the active material and conductive agent powders. It has micro-porous microstructure and compression elasticity to adaptively follow the volume changes of the negative electrode active material during charging/discharging. This keeps the battery poles close together, stabilizes pole group distance,

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Electrode binder for lithium-ion batteries and other electrochemical devices that improves cycle life and performance. The binder meets two criteria: elastic modulus E' is at least 4.5 x 106 Pa and viscosity modulus E'' is at least 0.9 x 106 Pa when measured at 25°C with a 1 µm indentation and 1 Hz frequency. This dynamic viscoelasticity behavior is achieved by swelling the binder in the electrolyte solvent and drying it to form a 1-2 mm thick film. The binder can be a (meth)acrylate polymer containing a hydroxyl group structural unit.

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Lithium secondary battery with improved cycle life and flexibility of the positive electrode. The battery has a wound structure with an anode, a high elastic modulus positive electrode layer, and a low elastic modulus positive electrode layer. The high elastic modulus layer provides cycle performance while the low elastic modulus layer increases flexibility. This allows thickening the positive electrode without cracking during winding. The low elastic modulus binder has lower stiffness than the high elastic modulus binder.

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Binder for battery electrodes that improves cycle life by reducing differentiation and delamination of battery pole pieces during expansion and contraction. The binder is a composite of a high molecular weight binding material and a conductive polymer like polypyrrolidinone or polyfluorene. The conductive polymer provides electronic conductivity between active materials while the high molecular weight binder provides strong adhesion to prevent delamination. This improves electrical integrity and reduces differentiation during expansion/contraction compared to traditional binders.

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Binder for anode of secondary battery that provides elasticity to withstand anode volume changes during charging/discharging, improves battery life and processability compared to conventional binders. The binder is a copolymer with specific repeating units and composition. The copolymer has a storage modulus of 100 MPa or more at 100°C, providing the required elasticity. The copolymer composition includes controlled ratios of first, second, third, and fourth repeating units. The binder is made by emulsion polymerization using specific monomers, initiator, and emulsifier.

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Binder for negative electrode of secondary batteries that provides improved cycle life by enabling the negative electrode to expand and contract without delamination during charging and discharging. The binder has a storage modulus of 100 MPa or more at 100°C to provide enough elasticity for volume changes. It can be made by emulsion polymerization. The binder is used in negative electrode mixtures, electrodes, and batteries to improve cycle life compared to conventional binders.

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Electrode for secondary batteries with improved tensile strength and resistance reduction. The electrode uses a dry mixing process for the active material, conductive material, and binders. This involves mixing the components without any liquid solvent. After mixing, the materials are compacted into a free-standing film. This film is then attached to the current collector to make the electrode. The dry mixing and film formation steps improve the electrode's tensile strength compared to wet mixing methods. The dry mixing also allows using different binders, with one binder attached to the surface of the other. This further improves the electrode properties.

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Electrode for secondary batteries with improved strength and resistance reduction effects, as well as a method to manufacture such electrodes. The electrode has a composition made by dry mixing active material, conductive material, a first binder with higher molecular weight, and a second binder with lower molecular weight. The mixed composition is shaped into a free-standing film before attaching it to the current collector. This allows forming a strong, freestanding electrode layer without the need for high-temperature sintering. The higher molecular weight binder improves electrode tensile strength while the lower molecular weight binder reduces resistance.

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