Positive pole active material for lithium secondary battery and manufacturing method thereof, lithium secondary battery
a technology of positive pole active material and secondary battery, which is applied in the direction of cell components, electrochemical generators, and nickel compounds, can solve the problems of significant resistance increase and structural instability of nickel-based lithium metal oxide, and achieve excellent resistance characteristics, minimize resistance increasing rate, and high capacity and structural stability.
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preparation example 1
A Large-Particle Diameter Positive Active Material Precursor
[0087]1) Preparation of Metal Salt Solution
[0088]First, two metal aqueous solutions having different Ni, Co, and Mn concentrations were prepared by using NiSO4.6H2O as a raw material of nickel, CoSO4.7H2O as a raw material of cobalt, and MnSO4.H2O as a raw material of manganese.
[0089]The first metal salt aqueous solution for forming the core portion is prepared by mixing the respective raw materials so as to satisfy the stoichiometric molar ratio of (Ni0.98Co0.01Mn0.01)(OH)2 in distilled water, wherein the molar concentration of the whole metal salt is 2.5 M.
[0090]Independently, the second metal salt aqueous solution for forming the shell portion is prepared by mixing the respective raw materials so as to satisfy the stoichiometric molar ratio of (Ni0.64Co0.23Mn0.13)(OH)2 in distilled water, wherein the molar concentration of the whole metal salt is 2.5 M.
[0091]2) Co-Precipitation Process
[0092]A co-precipitation reactor in ...
preparation example 2
A Small-Particle Diameter Positive Active Material Precursor
[0100]1) Preparation of Metal Salt Solution
[0101]A first aqueous metal salt solution and a second aqueous metal salt solution as in Preparation Example 1 were prepared.
[0102]2) Co-Precipitation Process
[0103]Using the same reactor as in Preparation Example 1, the other conditions were the same and the charging time and charging amount of each metal salt solution were varied.
[0104]Specifically, the impregnation rate of the reactor was adjusted to 140 rpm while introducing the first metal salt aqueous solution at a rate of 0.4 L / h, and a co-precipitation reaction was performed until the diameter of the precipitate became approximately 3.8 to 4.5 μm. At this time, the flow rate was adjusted so that the average residence time of the solution in the reactor was about 10 hours. After the reaction reached a steady state, the steady state duration was given to the reactant to obtain a denser co-precipitated compound.
[0105]Subsequent...
example 1
A Bi-Modal Positive Active Material in which a CeOxOHy Coating Layer is Formed, Simultaneously Doping of Zr: 0.0037 mol and Al: 0.0005 mol
Preparation of a Positive Active Material
[0108]1) Sintering Process
[0109](1) Lithium salts LiOH.H2O (Samjun Chem, battery grade), doping raw materials ZrO2 (Aldrich, 4N) and Al(OH)3 (Aldrich, 4N) were homogeneously mixed with the positive active material precursor prepared in Preparation Example 1.
[0110]During the mixing, the molar ratio of the precursor to the lithium salt was 1:1.05, and the content of Zr in the total amount was 0.0037 mol while the content of Al was 0.0005 mol.
[0111]The mixture was charged into a tube furnace (inner diameter: 50 mm, length: 1000 mm) and heated while introducing oxygen at 200 mL / min.
[0112]The sintering temperature was maintained at 480° C. for 5 h and then maintained at 700 to 750° C. for 16 h, and the heating rate was 5° C. / min. Accordingly, a large-particle diameter sintered body powder of which a composition ...
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