Non-aqueous electrolyte additive for improving safety and lightium ion secondary battery comprising same
A non-aqueous electrolyte and additive technology, applied in the field of non-aqueous electrolyte additives and lithium ion secondary batteries, can solve problems such as increasing amperage
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Embodiment 1
[0047] A nonaqueous electrolyte lithium ion secondary battery was prepared as follows.
[0048] Anode preparation:
[0049] After mixing carbon powder and polyvinylidene fluoride (PVDF) as a binder in a weight ratio of 90:10, the mixture was dispersed in N-methyl-pyrrolidone (NMP) as a solvent to prepare an anode mixture slurry . The anode mixture slurry was uniformly coated on both sides of the anode collector Cu foil at a thickness of 10 μm and dried, and then compression molded using a roll press to prepare a strip-shaped anode.
[0050] Preparation of the cathode:
[0051] Lithium carbonate and cobalt carbonate were mixed at a molar ratio of 1:1 and calcined at 900 °C for 7 hours to obtain LiCoO 2 . 92 wt% of lithium cobalt composite oxide, 4 wt% of carbon as a conductor, and 4 wt% of PVDF as a binder were added to the solvent NMP to prepare a cathode mixture slurry. The cathode mixture slurry was coated on the cathode collector Al film at a thickness of 20 μm and dri...
Embodiment 2-7
[0056] A nonaqueous electrolyte secondary battery was fabricated by the same method as in Example 1, except that the compounds shown in Table 1 were used as additives instead of titanium oxide acetylacetonate.
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