Nonaqueous electrolyte secondary battery
A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolytes, secondary batteries, etc., can solve the problem of reduced battery rate characteristics, difficult to inhibit metal cation metal cation precipitation, difficult to inhibit metal cation precipitation, etc. problem, to achieve the effect of reducing the save time
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Embodiment 1
[0092] (Battery 1)
[0093] (i) Preparation of non-aqueous electrolyte
[0094] Dissolve LiPF at a concentration of 1.0mol / L in a mixed solvent of ethylene carbonate (EC) and ethylmethyl carbonate (EMC) (volume ratio 1:4) 6 , the non-aqueous electrolyte is obtained.
[0095] (ii) Diaphragm
[0096] As the separator, a separator made of polytetrafluoroethylene (PTFE) (BSP0105565-3 manufactured by Goatex Corporation) was used. The separator made of PTFE has a thickness of 54 μm and a porosity of 61%.
[0097] (iii) Fabrication of the positive plate
[0098] LiNi as the positive active material 0.8 co 0.2 o 2 85 parts by weight of powder, 10 parts by weight of acetylene black as a conductive agent, and 5 parts by weight of polyvinylidene fluoride resin as a binder were mixed. The resulting mixture was dispersed in an appropriate amount of dehydrated N-methyl-2-pyrrolidone to prepare a slurry-like positive electrode mixture. This positive electrode mixture was applied to ...
Embodiment 2
[0138] (Battery 3~50)
[0139] Batteries 3 to 50 were produced in the same manner as in Battery 1 except that the nickel-lithium-containing composite oxide having the composition shown in Table 2 was used as the positive electrode active material.
[0140] For Batteries 3 to 50, the metal deposition amount and capacity recovery rate after storage were measured in the same manner as above. In the measurement of the amount of deposited metal after storage, when the positive electrode active material contains only Ni among Ni, Co, and Mn, the amount of Ni was taken as the amount of deposited metal. When the positive electrode active material contains Ni and Co, the total amount of Ni and Co is taken as the metal deposition amount. When the positive electrode active material contains Ni and Mn, the total amount of Ni and Mn is taken as the metal deposition amount. When the positive electrode active material contains Ni, Co, and Mn, the total amount of Ni, Co, and Mn is taken as ...
Embodiment 3
[0151] (Battery 51~55)
[0152] Batteries 51 to 55 were fabricated in the same manner as in Battery 1 except that separators made of the materials shown in Table 4 were used.
[0153] For Batteries 51 to 55, the metal deposition amount and capacity recovery rate after storage were measured in the same manner as above. In addition, in the measurement of the amount of metal deposition after storage, the total amount of Ni and Co was used as the amount of metal deposition. The results are shown in Table 4. In Table 4, the results of Batteries 1 to 2 are also shown.
[0154] In Table 4, the abbreviations of the materials constituting the separator are as follows.
[0155] PCTFE: polychlorotrifluoroethylene
[0156] PFA: tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
[0157] FEP: tetrafluoroethylene-hexafluoropropylene copolymer
[0158] Insulation layer with PVDF: Insulation layer consisting of polyvinylidene fluoride (PVDF) and aluminum oxide
[0159] Insulation...
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