(US5798191-A)      A rechargeable Li battery has at least one Li anode, an Li ion reducible cathode bonded to a 1st polymer and a polymer electrolyte composed of an Li salt dissolved in a 2nd polymer. The battery contains K ions as an additive distributed in the cathode and/or electrolyte. The concentration of Li and K in the 2nd polymer O/(Li+K) when the battery has reached equilibrium is 8:1 to 40:1, while the ratio Li/K is 0.2 to 15.    Also claimed are the cathode and the electrolyte per se.    ADVANTAGE -   The K ions stabilise battery performance during cycling, in terms of energy and power (claimed). Battery life is also improved.    (DE19809743-A1)      A rechargeable lithium battery consists of at least one lithium anode, one lithium ion reducible cathode bonded to a first polymer, and a polymer electrolyte comprising a lithium salt in solution in a second polymer. The battery contains a potassium ion additive distributed in the cathode and/or the polymer electrolyte. The concentration of lithium and potassium in the second polymer, when the battery has reached equilibrium, expressed as O/(Li + K), is between 8/1 and 40/1 and the molar ratio Li/K is between 0.2 and 15.    Also claimed are (i) the lithium ion reducible cathode bonded to a polymer and (ii) the polymer electrolyte containing potassium ions.    ADVANTAGE -   The potassium ions stabilise battery performance (with respect to energy and power) during cycling. They maintain the morphology of the lithium anode and optimise the physical properties of the cathode. The battery can be recycled many tens of times without dendrite formation.    (FR2760568-A1)      A rechargeable lithium battery consists of at least one lithium anode, one lithium ion reducible cathode bonded to a first polymer, and a polymer electrolyte comprising a lithium salt in solution in a second polymer. The battery contains a potassium ion additive distributed in the cathode and/or the polymer electrolyte. The concentration of lithium and potassium in the second polymer, when the battery has reached equilibrium, expressed as O/(Li + K), is between 8/1 and 40/1 and the molar ratio Li/K is between 0.2 and 15.    Also claimed are (i) the lithium ion reducible cathode bonded to a polymer and (ii) the polymer electrolyte containing potassium ions.    ADVANTAGE -   The potassium ions stabilise battery performance (with respect to energy and power) during cycling. They maintain the morphology of the lithium anode and optimise the physical properties of the cathode. The battery can be recycled many tens of times without dendrite formation.    (JP10312828-A)      A rechargeable lithium battery consists of at least one lithium anode, one lithium ion reducible cathode bonded to a first polymer, and a polymer electrolyte comprising a lithium salt in solution in a second polymer. The battery contains a potassium ion additive distributed in the cathode and/or the polymer electrolyte. The concentration of lithium and potassium in the second polymer, when the battery has reached equilibrium, expressed as O/(Li + K), is between 8/1 and 40/1 and the molar ratio Li/K is between 0.2 and 15.    Also claimed are (i) the lithium ion reducible cathode bonded to a polymer and (ii) the polymer electrolyte containing potassium ions.    ADVANTAGE -   The potassium ions stabilise battery performance (with respect to energy and power) during cycling. They maintain the morphology of the lithium anode and optimise the physical properties of the cathode. The battery can be recycled many tens of times without dendrite formation.