EP3208870A1 - NEGATIVE ELECTRODE FOR POTASSIUM ION SECONDARY BATTERIES, NEGATIVE ELECTRODE FOR POTASSIUM ION CAPACITORS, POTASSIUM ION SECONDARY BATTERY, POTASSIUM ION CAPACITOR, AND BINDER FOR NEGATIVE ELECTRODES OF POTASSIUM ION SECONDARY BATTERIES OR NEGATIVE ELECTRODES OF POTASSIUM ION CAPACITORS | Patent Bear