Lithium ion secondary battery and method for manufacturing lithium ion secondary battery
A secondary battery and manufacturing method technology, applied in secondary battery, electrolyte storage battery manufacturing, electrode manufacturing, etc., can solve the problems of increasing negative electrode impedance, blocking micropores, reducing rate characteristics of lithium ion secondary batteries, etc., to achieve rate characteristics The effect of reducing inhibition
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Embodiment 1～7 and comparative example 1～6
[0120] Using the positive electrode treated under the above heat treatment conditions, a cylindrical lithium ion secondary battery was produced by the following method.
[0121]As shown in Table 2, in Examples 1 to 7 and Comparative Examples 1 to 6, positive electrodes obtained by heat treatment under the conditions shown in Table 1 were used, respectively. In addition, as the separator, a microporous film made of polyethylene was used.
[0122] Manufactured with cathode, anode, non-aqueous electrolyte and separator figure 1 A cylindrical lithium-ion secondary battery is shown. In addition, as the positive electrode lead, an aluminum lead was used, and as the negative electrode lead, a nickel lead was used. In addition, as the battery case, a nickel-plated iron case was used.
[0123] As the non-aqueous solvent of the non-aqueous electrolytic solution, ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC) and 1,1,2,2-tetrafluoroethyl 2, 2,3,3-Tetrafluo...
Embodiment 8～15 and comparative example 7～9
[0148] As shown in Table 3, except that the composition of the non-aqueous solvent of the non-aqueous electrolytic solution was changed, a lithium-ion battery was fabricated and evaluated in the same manner as in Example 1. In addition, Examples 8 to 15 used a non-aqueous solvent containing a fluoroether different from TFETFPE. In addition, in Comparative Example 7, a non-aqueous solvent containing no fluoroether was used in which EC, EMC, and DMC were mixed at a volume ratio of 1:1:8. In addition, in Comparative Example 8, a non-aqueous solvent containing no fluoroether was used in which EC, PC, and DEC were mixed in a volume ratio of 3:3:4. In addition, in Comparative Example 9, a non-aqueous solvent containing TFETFPE was used, but a positive electrode having a coverage rate of 10% of PVDF not subjected to heat treatment was used.
[0149] The results are shown in Table 3 together with the results of Example 1 and Comparative Example 6.
[0150] [table 3]
[0151] ※Posit...
Embodiment 16～25
[0169] As shown in Table 4, except that the composition of the non-aqueous solvent of the non-aqueous electrolytic solution was changed, a lithium ion secondary battery was fabricated and evaluated in the same manner as in Example 1.
[0170] The results are shown in Table 4.
[0171] [Table 4]
[0172] ※Positive electrode active material: LiNi 0.82 co 0.15 al 0.03 o 2
[0173] ※Adhesive: PVDF (5% by weight)
[0174] ※Heat treatment conditions for the positive electrode: No.10 (280°C, 60 seconds)
[0175] ※PVDF coverage: 42% (contact angle on positive surface: 22°)
[0176]
[0177] As shown in Table 4, in the lithium ion secondary batteries of Examples 16 to 25, metal precipitation was small, and the capacity recovery rate was also high.
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