DRY FRIABLE FLUOROPOLYMER AGGLOMERATE COMPOSITIONS FOR USE AS BINDER IN LITHIUM-ION SECONDARY BATTERY ELECTRODES

Fluoropolymer compositions for use as binder in a lithium-ion secondary battery electrodes are described, as well as methods of their manufacture, and electrode compositions and lithium-ion secondary batteries utilizing such. The fluoropolymer compositions are dry friable agglomerates manufactured by cocoagulation of aqueous dispersions of a first tetrafluoroethylene polymer having a melt creep viscosity of at least about 0.5×1011 poise, and a second polymer different from the first polymer. These fluoropolymer compositions afford lithium-ion secondary batteries with improved performance, through such as improved loading of electrodes, and stability of PTFE binder in the anode, and result in lithium-ion secondary batteries having improved performance, such as improved capacity and improved reversible capacity retention.