| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery in which lithium titanate is used for a negative electrode active material, and 4 V-class active material is used for a positive electrode, and a LiPF<SB POS="POST">6</SB>-containing nonaqueous electrolyte is used as the electrolyte of the battery, and which realizes a high conductivity and offers an excellent reliability even in storage under a harsh environment such as a humid one. <P>SOLUTION: The nonaqueous electrolyte secondary battery comprises: lithium titanate for a negative electrode; 4 V-class active material for a positive electrode; and LiPF<SB POS="POST">6</SB>as an electrolyte. As to the negative electrode, vapor-phase growing carbon fiber is used as a conducting agent, and polyacrylic acid is used as a binding agent, which allows a high conductivity and an excellent reliability to be achieved even in storage under a humid environment. With the addition amount of the polyacrylic acid, it is preferable to add not less than 1 to not more than 7 mass% of polyacrylic acid with respect to the whole negative electrode. Further, it is preferable that the vapor-phase growing carbon fiber has an average fiber length of 1 to 5 μm inclusive. <P>COPYRIGHT: (C)2012,JPO&INPIT |
