To increase safety at the time of a temperature rise due to overcharging without decreasing the active material fill of a positive electrode and a negative electrode by providing a current interrupting means operated as the battery internal pressure rises, and forming the positive electrode with a positive electrode active material mainly made of a transition metal oxide, a conductive auxiliary containing a carbon material adsorbing the gas desorbable by heat, and a binder.
A carbon material adsorbing the gas desorbable by heat and having a large specific surface area is used as the conductive auxiliary of a positive electrode. When the internal pressure is increased by the gas generated at the time of a temperature rise due to overcharging, a current is interrupted by a pressure valve, and explosion is prevented. The specific surface area of the carbon material is preferably set to 50-5000 m2/g. The conductive auxiliary preferably contains one or more of a graphite material adsorbing the gas of CO2, CO, N2 or Ar, granular activated carbon with the grain size of 150 μm or above, powdery activated carbon with the grain size below 150 μm, carbon black, an amorphous carbon material, and cellulose fibered activated carbon.
| JP2006049158 | LITHIUM POLYMER BATTERY AND ITS MANUFACTURING METHOD |
| WO/2020/262649 | METHOD FOR PRODUCING MOLDING FOR ELECTRODE |
YOSHIKAWA MASANORI
MURANAKA TADASHI
