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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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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A conductive material paste composition for secondary battery electrodes that enables formation of electrode layers with improved dispersion of conductive nanomaterials like carbon nanotubes and enhanced adhesion to the current collector. The paste uses a binder containing a specific copolymer with a weight average molecular weight of 170,000 to 1,500,000. This copolymer composition improves dispersion of nanomaterials like carbon nanotubes in the slurry and electrode layers. It also improves adhesion between the electrode and current collector when applied as an undercoat. This leads to better battery performance when using electrodes made from this paste.

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Electrode material for batteries with improved electronic conductivity, especially for all-solid-state batteries, that uses a specific elastomer binder to disperse conductive fibers. The electrode material includes active material, conductive fibers, and elastomer binder. The elastomer has repeating units with aromatic rings, like styrene, and contains at least 15% of these units. This elastomer improves fiber dispersion in the electrode compared to traditional binders. The small fiber size and elastomer adsorption promote fiber dispersion. This electrode material allows higher fiber content without aggregation for better conductivity.

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Conductive cross-linked binder for electrodes that allows preparing battery electrodes without conductive additives. The binder is made by mixing alginate solution with MXene flakes and stirring at low temperature to form a uniform mixture. This cross-linked binder provides both adhesion and electronic conductivity without needing additional conductive additives in the electrode slurry. It allows preparing electrodes with high loading of active material like sulfur without volume expansion issues. The cross-linked binder can spontaneously form hydrogen bonding between the MXene flakes and alginate to bind the electrode materials together.

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Lithium secondary battery with improved durability by multidirectionally fiberizing the binder in the active layer. This involves mixing the electrode materials at low temperature, heating and primary fiberization, pulverizing at room temp, and secondary fiberization. The fiberized binder provides better adhesion between components and reduces particle dispersion compared to non-fiberized binders. The fiberized binder is made by multidirectional fiberization using steps like kneading and pulverizing at different temperatures. This improves cohesion and durability of the electrode active materials, conductive materials, and binder.

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Preparation method for battery electrode sheets using conductive polymers as binders instead of traditional inert binders like PVDF. The method involves mixing the active material, conductive polymer, and conductive agent directly on the current collector and pressing it together without using a solvent slurry. The conductive polymer forms electrical pathways between the active material particles, reducing the need for additional conductive agents. This increases the active material content in the electrode and improves energy density compared to using inert binders.

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A conductive composite water-based adhesive for lithium-ion battery electrodes that provides better adhesion, flexibility, and conductivity compared to conventional binders. The adhesive contains a polyacrylic acid or polyacrylate water-based binder with a conductive filler like carbon black. The filler content is 0.1-10 wt% to balance bonding performance and conductivity. By incorporating conductive fillers into the binder, it allows the binder to play a stronger role in lithium-ion batteries and provides better electrode adhesion and conductivity.

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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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Electrode for electrochemical devices like lithium-ion batteries that has improved flexibility and allows increasing energy density and output characteristics. The electrode contains an electrode mixture layer with a specific composition and properties. The mixture layer has a conductive material containing fibrous conductive particles, a binder polymer, and the electrode active material. The fibrous conductive particles are 10-1000x longer than width. The binder polymer contains nitrile groups and has a Mooney viscosity of 70-150 ML1+4, 100°C. The electrode mixture layer contains 0.3-1.5% fibrous conductive particles by mass, 50-200 parts polymer per 100 parts conductive material, and the binder at 0.3-2.0% by mass.

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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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Active material-conductive material-binder composite for lithium-ion batteries that reduces cracking and side reactions during charging and discharging, improves cycle life, and enables thicker electrodes. The composite material has the active material coated with a conductive carbon nanotube layer and a thermosetting binder. This coating prevents micro-cracks from forming inside the active material during cycling and suppresses side reactions between the active material and electrolyte. The composite material is prepared separately from the electrode slurry components and mixed in optimized ratios to uniformly distribute the conductive nanotubes and binder throughout the active material. This avoids segregation during solvent drying and slurry coating steps.

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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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Secondary battery electrode with improved tensile strength and flexibility for batteries like lithium-ion cells. The electrode uses a binder with fibers of different sizes. The binder contains larger diameter fibers (>6 µm) and smaller diameter fibers (0.01-2 µm). This mixture of fiber sizes provides enhanced mechanical properties compared to a homogeneous fiber size. The larger fibers provide strength and the smaller fibers enable flexibility. The binder content is 1-5 wt% and the electrode has a contact angle deviation of 0.01-5 degrees. The electrode can be manufactured by a dry mixing process with faster initial mixing and slower secondary mixing to form the fiberized binder. This process avoids damaging the active material and provides the desired fiber size distribution.

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