Non-aqueous electrolyte secondary cell
By using a specific ratio of a mixed solvent of ethylene carbonate and propylene carbonate in a non-aqueous electrolyte secondary battery and adding a 1,3-dioxopentane compound, a stable film is formed, which solves the problem of gas generation caused by EC and PC. and the problem of discharge capacity decline, achieving efficient discharge performance optimization.
Active Publication Date: 2008-04-02
PANASONIC ENERGY CO LTD
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0010] However, this technology cannot overcome the disadvantages of EC and PC mentioned above
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0045] A battery related to Example 1 was fabricated in the same manner as in the above embodiment except that a mixed solvent of 50 parts by mass of ethylene carbonate (EC) and 50 parts by mass of propylene carbonate (PC) was used.
Embodiment 2
[0047] A battery related to Example 2 was produced in the same manner as in Example 1 above except that the amount of 1,3-dioxane (DOX) added was changed to 0.1% by mass.
Embodiment 3
[0049] A battery related to Example 3 was produced in the same manner as in Example 1 above except that the amount of 1,3-dioxane added was changed to 0.5% by mass.
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Abstract
The present invention provides a nonaqueous electrolyte secondary battery excellent in cycle characteristics. A non-aqueous electrolyte secondary battery has a positive pole, a negative pole, and a non-aqueous electrolyte containing a non-aqueous solvent and an electrolyte salt, and is characterized in that the above-mentioned non-aqueous solvent contains ethylene carbonate and propylene carbonate, and the above-mentioned ethylene carbonate The ratio of ethylene carbonate to the total mass of ester and propylene carbonate is 0.40 to 0.78, and the nonaqueous electrolyte contains 0.1 to 5.0% by mass of the 1,3-dioxane compound shown in [Chem. 1] above. R1 to R4 each independently represent a hydrogen atom, a methyl group, or an ethyl group.
Description
technical field [0001] The present invention relates to the improvement of the discharge performance of a non-aqueous electrolyte secondary battery. Background technique [0002] In recent years, the miniaturization and weight reduction of mobile information terminals such as mobile phones, notebook computers, and PDAs has rapidly progressed, and non-aqueous electrolyte secondary batteries with high energy density and high capacity have been widely used as their driving power sources. [0003] In such nonaqueous electrolyte secondary batteries, ethylene carbonate (EC) and propylene carbonate (PC) are used as their nonaqueous solvents from the viewpoint of excellent electrical performance. [0004] EC has the advantage of forming a stable film with high lithium ion conductivity by reacting with the negative electrode. However, since the oxidative decomposition potential is low, there is a problem that it reacts with the positive electrode to decompose to generate gas, which ...
Claims
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IPC IPC(8): H01M10/40H01M10/05H01M10/0567H01M10/0569
CPCY02E60/122H01M10/052H01M10/0567H01M10/0569Y02E60/10
Owner PANASONIC ENERGY CO LTD