Patent ID: 8697273
Filing Date: 2014-04-15
Classification: H01M,Y02E,Y02P

Abstract:
1. An electrode/separator assembly for use in a lithium transition metal phosphate electrochemical cell, comprising: a current collector; a porous composite electrode layer adhered to the current collector, said electrode layer comprising electroactive lithium transition metal phosphate particles and a binder; and a porous composite separator layer comprising inorganic particles substantially uniformly distributed in a polymer matrix to form nanopores and having a pore volume fraction of at least 25%, wherein the separator layer is secured to the electrode layer by a solvent weld that comprises a co-mingled mixture of the binder and the polymer at the interface between the two layers, wherein the solvent weld is formed by solubilization of the binder with a solvent and the binder has a lesser solubility in the solvent as compared to the solubility of the polymer in the solvent; and wherein the solvent does not penetrate more than 50% of the thickness of the electrode layer.