Nickel-based active material for lithium secondary battery, preparation method thereof, and lithium secondary battery including positive electrode containing same
一种锂二次电池、活性材料的技术，应用在二次电池、锂蓄电池、电池电极等方向，能够解决锂二次电池长寿命劣化、电池容量特性达不到、阻抗升高等问题
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[0062] A method of preparing a nickel-based active material according to an embodiment will be described.
[0063] In one embodiment, a method of preparing a nickel-based active material includes low temperature heat treatment of lithium precursors and metal hydroxides and high temperature heat treatment.
[0064] The low-temperature heat treatment may include: mixing the lithium precursor and the metal hydroxide at a predetermined molar ratio; and heat-treating the mixture at a temperature ranging from 650°C to 800°C.
[0065] The metal hydroxide may be a compound represented by Formula 2.
[0066] Formula 2
[0067] (Ni 1-x-y-z co x mn y m z )(OH) 2
[0068] In Formula 2, M is selected from boron (B), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), titanium (Ti), vanadium (V), chromium (Cr), iron (Fe), copper (Cu), zirconium (Zr) and aluminum (Al) elements; and
[0069] x≤(1-x-y-z), y≤(1-x-y-z), 0
[0070] In Formula 2, 0
Embodiment 1
[0128] Embodiment 1: Preparation of nickel-based active material
[0129] (1) Preparation of nickel-based active material precursors
[0130] Aqueous ammonia at a concentration of 0.5 mol / L (M) was added to the reactor, and the contents of the reactor were allowed to start reacting at a reaction temperature of 50°C. Then, metal raw materials (nickel sulfate, cobalt sulfate, and manganese sulfate) were added at a rate of 5 L / hour. Subsequently, sodium hydroxide (NaOH) was added to the reactor so that the pH of the contents was in the range of 11.0-12.0, and the contents in the reactor were allowed to react for 6 hours. When the average particle diameter (D50) of the particles in the reactor reaches about 10 μm, the particles are allowed to react at a temperature of about 50° C. Once the reaction was carried out, the slurry solution in the reactor was filtered, washed with high-purity distilled water, and dried in a hot air oven for 24 hours to prepare a nickel-based active ...
Embodiment 2
[0135] Example 2: Preparation of Lithium Secondary Battery Comprising Nickel-Based Active Material Secondary Particles
[0136] A nickel-based active material comprising the zirconia coating prepared in Example 1 (LiNi 0.6 co 0.2 mn 0.2 o 2 ) Lithium secondary battery with secondary particles.
[0137] The zirconia-coated nickel-based active material (LiNi 0.6 co 0.2 mn 0.2 o 2 ) secondary particles, 2 g of polyvinylidene fluoride, 47 g of N-methylpyrrolidone as a solvent, and 2 g of carbon black as a conductive agent were mixed by using a mixer to prepare a mixture, and air bubbles were removed from the mixture to prepare a compound in which the components were uniformly dispersed. A slurry for forming a positive electrode active material layer.
[0138] The slurry thus prepared was prepared in the form of a thin electrode plate by coating the slurry on an aluminum film by using a doctor blade, drying at 135° C. for 3 hours or longer, and then rolling and vacuum dry...
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