Negative electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery
A non-aqueous electrolyte, secondary battery technology, applied in the direction of non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of battery deformation and cycle characteristics reduction, and achieve inhibition of battery expansion, high capacity, The effect of suppressing the decrease in cycle characteristics
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Embodiment 1
[0123] (1) Preparation of positive electrode active material
[0124] Cobalt sulfate was added to nickel sulfate aqueous solution to prepare an aqueous solution having a metal ion concentration of 2 mol / L and Ni:Co=8.5:1.5 (molar ratio). A 2 mol / L sodium hydroxide aqueous solution was added dropwise to the aqueous solution with stirring. The separated precipitate was collected by filtration, washed with water, and dried at 80°C to obtain 0.85 co 0.15 (OH) 2 Indicates the composition of the composite hydroxide.
[0125] Heating the composite hydroxide obtained above at 900°C for 10 hours in the atmosphere yielded 0.85 co 0.15 A composite oxide with a composition represented by O. Lithium hydroxide monohydrate was mixed in the obtained composite oxide so that the sum of the atomic numbers of Ni and Co was equal to the atomic number of Li, and the obtained mixture was heated at 800° C. for 10 hours in the atmosphere, whereby obtained with LiNi 0.85 co 0.15 o 2 A lithium...
Embodiment 2
[0149] The oxygen flow rate when making film 60 is changed to 900 sccm, the oxygen flow rate when making film 61 is changed to 600 sccm, and the oxygen flow rate when making film 62 is changed to 300 sccm, except that, in the same manner as in Example 1, the negative electrode collector The surface of each convex portion 31 of the electrode 21 is formed by a first portion 35 (the oxygen content ratio is 30% by mass), a second portion 36 (the oxygen content ratio is 4% by mass), and a third portion 37 (the oxygen content ratio is 30% by mass) to produce a negative electrode. This negative electrode was cut to produce a negative electrode plate of 31 mm×390 mm. A nonaqueous electrolyte secondary battery was produced in the same manner as in Example 1 except for using this negative electrode plate.
Embodiment 3
[0151] The oxygen flow rate when making the thin film 60 is changed to 1600 sccm, the oxygen flow rate when the thin film 61 is made is changed to 800 sccm, and the oxygen flow rate when the thin film 62 is made is changed to 300 sccm. The surface of each protrusion 31 of the electrode 21 is formed by a first part 35 (the oxygen content ratio is 45 mass %), a second part 36 (the oxygen content ratio is 6 mass %), and a third part 37 (the oxygen content ratio is 30% by mass) to produce a negative electrode. This negative electrode was cut to produce a negative electrode plate of 31 mm×390 mm. A nonaqueous electrolyte secondary battery was produced in the same manner as in Example 1 except for using this negative electrode plate.
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