| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery using a positive electrode plate capable of improving continuous charging characteristics and high-temperature preservation characteristics, even with charging at a charging voltage of 4.40 V or more on a lithium criterion. <P>SOLUTION: In the nonaqueous electrolyte secondary battery having the positive electrode plate 11 wherein a positive electrode mixture agent is coated on a positive electrode collector, a negative electrode plate wherein a negative electrode mixture agent is coated on a negative electrode collector, and a nonaqueous electrolyte wherein electrolyte salt is dissolved in a separator and a nonaqueous solvent, a first-layered positive electrode mixture agent layer 11B formed on both sides or one side of the positive electrode collector 11A and a second-layered positive electrode mixture agent 11C with a composition different from the first layer formed on the surface of the first-layered positive electrode mixture agent layer 11B are formed on the positive electrode plate 11. A positive electrode active material in the second-layered positive electrode mixture agent layer 11C is a material wherein a dissolved amount of metal elements except lithium is less than a positive electrode active material of the first-layered positive electrode mixture agent layer 11B at the time of immersing into acid aqueous solution. <P>COPYRIGHT: (C)2009,JPO&INPIT |
