Manufacturing method for lithium secondary battery anodes and lithium secondary batteries

Manufacturing method for thick-film graphite anodes with ion transport pathways secured via magnetic field alignment

This technology enhances lithium-ion conductivity by applying a 1–20T magnetic field to a graphite anode active material slurry, adjusted to a viscosity of 2000–3900 cP, to align the layered crystal structure of the graphite in a specific direction.

Increasing electrode loading to boost the capacity of graphite anodes has historically restricted the pathways available for lithium-ion movement, creating a limitation where thicker electrodes suffer from reduced ion conductivity.

This technology optimizes viscosity to 2000–3900 cP by controlling the solvent content (such as NMP) to 5–10 wt% of the total slurry. It then induces c-axis alignment of the graphite crystals within a magnetic field, ensuring both uniform quality and improved ion conductivity. This process can be applied to anode coating for long-range electric vehicle batteries and fast-charging cells that require high-loading thick-film anodes, allowing for electrode designs that increase loading while reducing the risk of lithium plating.

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Key Features:

• Anode active material slurry containing natural or artificial graphite, conductive additives, and a solvent
• Anode active material slurry film with a viscosity of 2000 to 3900 cP, achieved by controlling the solvent content to 5 to 10 wt% of the total slurry
• A step of orienting the slurry film within a magnetic field space such that the θRFA is between 27.2 and 31.6 degrees when a 10T magnetic field is applied
• A step of drying the oriented anode active material slurry film to complete the anode

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