Graphite-density lithium-ion cells with PVDF-coated separators unlock longer cycle life without capacity fade for consumer batteries.
The patent describes a lithium-ion (or lithium-polymer) battery using a specific graphite anode density (1.2–1.5 g/cm³) paired with a LiNiO2 cathode density (3.0–3.3 g/cm³), with an electrolyte separated by a PVDF-coated separator that mechanically holds layers together. Matching these density targets and the PVDF-coated separator addresses degradation modes that drive capacity fade across repeated charge/discharge cycles. Until licensing rights expire, manufacturers needed permission to make batteries implementing this exact density-and-separator approach.
Develop higher-cycle-life lithium-ion packs for e-bike, power tools, and handheld devices without paying battery-layering royalties.
An improved lithium-ion or lithium-polymer battery that is capacity-fade resistant. The battery includes an anode comprised of graphite where density of the graphite is in a range from 1.2 to 1.5 g/c3; and the battery further has a cathode that is comprised of LiNiO2 present at a density in a range from 3.0 to 3.3 g/c3. The battery also includes an electrolyte and a separator between the anode and cathode, and the separator is coated with PVDF such that the anode, cathode, and separator are held together to form the electricity-producing battery.
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