Nonaqueous electrolyte and electrochemical element using the same
A non-aqueous electrolyte and non-aqueous solvent technology, applied in the field of non-aqueous electrolyte, can solve problems such as battery performance degradation, and achieve the effect of improving low-temperature cycle characteristics
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Embodiment 1～8 and comparative example 1～3
[0115] 〔Manufacture of lithium-ion secondary battery〕
[0116] Will LiNi 0.8 co 0.15 Al 0.05 o 2 (Positive electrode active material, when 10 g of positive electrode active material is dispersed in 100 ml of distilled water, the pH of the supernatant at room temperature is 11.8) 94% by mass and 3% by mass of acetylene black (conductive agent) are mixed, and added to the previously prepared polyvinylidene fluoride (Binder) 3% by mass was dissolved in 1-methyl-2-pyrrolidone and mixed to prepare a positive electrode mixture paste. This positive electrode mixture paste was applied to one surface of an aluminum foil (current collector), dried and pressurized, and punched into a predetermined size to produce a positive electrode sheet. The density of the positive electrode except the current collector is 3.6g / cm 3 . In addition, artificial graphite (d 002 =0.335nm, negative electrode active material) 95% by mass was added to a solution obtained by dissolving 5% by mass of pol...
Embodiment 9 and comparative example 4
[0133] The negative electrode active material used in Example 2 and Comparative Example 1 was changed, and Si (negative electrode active material) was used to produce a negative electrode sheet. Mix 80% by mass of Si and 15% by mass of acetylene black (conductive agent), add to a solution obtained by dissolving 5% by mass of polyvinylidene fluoride (binder) in 1-methyl-2-pyrrolidone, and mix , the negative electrode mixture paste was prepared. The negative electrode mixture paste was coated on copper foil (current collector), dried, pressurized, punched to a predetermined size, and a negative electrode sheet was produced. In addition, it was the same as Example 2 and Comparative Example 1. Coin batteries were produced in the same manner and battery evaluations were performed. The results are shown in Table 2.
[0134] Table 2
[0135]
[0136] *1: Content of 1,3-propanediol sulfite in non-aqueous electrolyte
Embodiment 10 and comparative example 5
[0138] Change the positive electrode active material used in Example 2 and Comparative Example 1, and use LiFePO covered with amorphous carbon 4 (Positive electrode active material) A positive electrode sheet was produced. Hybrid LiFePO covered with amorphous carbon 4 90% by mass, 5% by mass of acetylene black (conductive agent), were added to a solution obtained by dissolving 5% by mass of polyvinylidene fluoride (binder) in 1-methyl-2-pyrrolidone in advance and mixed to prepare positive electrode mixture paste. This positive electrode mixture paste was applied on an aluminum foil (current collector), dried and pressurized, punched out to a predetermined size, and a positive electrode sheet was produced, and the end-of-charge voltage during battery evaluation was set to 3.6V 1. A coin battery was produced in the same manner as in Example 2 and Comparative Example 1 except that the end-of-discharge voltage was set to 2.0 V, and battery evaluation was performed. The results ...
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