Lithium-ion secondary battery, negative electrode for lithium-ion secondary battery and battery pack
A secondary battery, lithium-ion technology, applied in the negative electrode field, can solve the problem of battery characteristic degradation, and achieve the effect of excellent battery characteristics
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experiment Embodiment 1-1 to 1-9
[0239] Produced by the procedure described below Figure 8 and Figure 9 The laminated film type secondary battery shown in .
[0240] The positive electrode 53 is formed. First, 91 parts by mass of positive electrode active material (LiCoO 2 ), 6 parts by mass of a positive electrode conductive agent (graphite), and 3 parts by mass of a positive electrode binder (polyvinylidene fluoride: PVDF) were mixed together to form a positive electrode mixture. The positive electrode mixture was dispersed in an organic solvent (N-methyl-2-pyrrolidone: NMP) to form a paste-like positive electrode mixture slurry. The positive electrode mixture slurry is then coated on both surfaces of the positive electrode current collector 53A using a coating device, and dried to form the positive electrode active material layer 53B. As the positive electrode current collector 53A, a strip-shaped aluminum foil (thickness: 12 μm) was used. Finally, the positive electrode active material layer 53B wa...
experiment Embodiment 2-1 to 2-94
[0256] As shown in Tables 2 to 7, secondary batteries were produced by the same procedure as in Experimental Examples 1-1 to 1-7 except that different types and combinations of M1 metals were used. The characteristics of each resulting secondary battery were examined. In this case, in order to carry out with powdered SiO y For co-deposition, each powdered metal M1 was used.
[0257] Table 2
[0258]
[0259] table 3
[0260]
[0261] Table 4
[0262]
[0263] table 5
[0264]
[0265] Table 6
[0266]
[0267] Table 7
[0268]
[0269] Like the results shown in Table 1, high cycle retention, high initial efficiency and high load retention were obtained even when different types and combinations of M1 metals were used.
experiment Embodiment 3-1 to 3-7
[0271] As shown in Table 8, secondary batteries were produced by the same procedures as in Experimental Examples 1-1 to 1-7, except that the covering portions had different compositions (different atomic ratios y). The characteristics of each resulting secondary battery were examined. In this case, the oxygen flow rate is adjusted during the melt-solidification of the raw material (Si) to control the atomic ratio y.
[0272] Table 8
[0273]
[0274] When the atomic ratio y is 0.5≤y≤1.5, a high cycle retention rate is obtained.
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