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Cathode active material for lithium secondary battery, preparation method therefor, and lithium secondary battery comprising same

A cathode active material, lithium secondary battery technology, used in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve problems such as capacity decline, and achieve the effect of low initial resistance and excellent discharge capacity

Pending Publication Date: 2021-07-23
浦项控股股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for this ternary NCM system active material, the more the content of Ni increases, the more it is necessary to use various doping additives to ensure structural safety, and in this case, the capacity may decrease

Method used

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  • Cathode active material for lithium secondary battery, preparation method therefor, and lithium secondary battery comprising same
  • Cathode active material for lithium secondary battery, preparation method therefor, and lithium secondary battery comprising same
  • Cathode active material for lithium secondary battery, preparation method therefor, and lithium secondary battery comprising same

Examples

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preparation example Construction

[0064] In one embodiment, a method for preparing a positive electrode active material for a lithium secondary battery is provided, comprising: a step of preparing hydroxide precursor particles comprising nickel, cobalt and manganese; A step of primary calcination to prepare porous oxide precursor particles; a step of mixing the oxide precursor particles and a metal oxide to prepare a primary mixture; mixing the primary mixture and a lithium raw material to prepare a secondary the step of mixing; and the step of performing secondary calcination on said secondary mixture.

[0065] Hereinafter, the preparation method of the cathode active material is described in further detail.

[0066] First, hydroxide precursor particles containing nickel, cobalt and manganese are prepared.

[0067] The hydroxide precursor particles can be prepared by mixing nickel raw materials, cobalt raw materials, manganese raw materials and a solvent, co-precipitating the mixture, and then drying. The u...

preparation example 1

[0132] Preparation Example 1: Large particle size active material hydroxide precursor

[0133] 1) Preparation of metal salt solution

[0134] NiSO is used as nickel raw material 4 ·6H 2 O, using CoSO as the cobalt raw material 4 ·7H 2 O, using MnSO as the manganese raw material 4 ·H 2 O, these were added to deionized water and dissolved to prepare two metal salt aqueous solutions having different concentrations of Ni, Co and Mn.

[0135] For the first metal salt aqueous solution used to form the inner core, the raw materials are mixed in deionized water to satisfy (Ni 0.98 co 0.01 mn 0.01 )(OH) 2 The stoichiometric molar ratio, and the molar concentration of the overall metal salt is prepared to reach 2.5M.

[0136] Independently of this, for the second metal salt aqueous solution for forming the shell portion, the respective raw materials were mixed in deionized water so as to satisfy (Ni 0.64 co 0.23 mn 0.13 )(OH) 2 The stoichiometric molar ratio, and the molar...

preparation example 2

[0145] Preparation Example 2: Small particle size cathode active material hydroxide precursor

[0146] 1) Preparation of metal salt solution

[0147] The same first metal salt aqueous solution and second metal salt aqueous solution as in Preparation Example 1 were prepared.

[0148] 2) Co-precipitation process

[0149] Utilize the same reactor as Preparation Example 1, except that the addition time and addition amount of each metal salt solution are different, other conditions are all the same.

[0150] Specifically, the first metal salt aqueous solution was added at a rate of 0.3 liter / hour, and the impeller speed of the reactor was adjusted to 140 rpm, so as to carry out coprecipitation reaction until the diameter of the precipitate reached about 15.0 μm. At this time, by adjusting the flow rate, the average residence time of the solution in the reactor reaches more than 15 hours. After the reaction is in a normal state, the reactant is given a normal state duration to obt...

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Abstract

The present invention relates to a cathode active material for a lithium secondary battery, a preparation method therefor, and a lithium secondary battery comprising same. The cathode active material comprises secondary particles obtained by granulating at least one primary particle and shown by the chemical formula 1, and comprises metal oxide particles, which have a nano-sized average diameter (D50) and are located inside the secondary particles. The chemical formula 1 is Lia[NixCoyMnz]tM<1-t>O<2-p>Xp, and in the chemical formula 1, the definition of each substituent is the same as that in the detailed description.

Description

technical field [0001] The invention relates to a lithium secondary battery cathode active material, a preparation method thereof and a lithium secondary battery containing it. Background technique [0002] In recent years, with the explosive growth of demand for IT mobile devices and small electric drive devices (electric bicycles, small electric cars, etc.) The development of secondary batteries with high capacity and high energy density requires the use of high-capacity positive electrode active materials in order to prepare such high-capacity batteries. [0003] Among the existing layered cathode active materials, the material with the highest capacity is LiNiO 2 (275 mAh / g), but it is prone to structural collapse during charging and discharging, and the thermal stability caused by the oxidation number problem is low, so it is actually difficult to commercialize. Therefore, in order to solve such problems, ternary NCM system active materials (containing Li, Ni, Co and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/485H01M4/62H01M4/36H01M10/052C01G53/00C01G25/02
CPCH01M4/62H01M4/525Y02E60/10C01G53/50C01P2002/52C01P2004/61C01P2002/85C01P2006/40C01G53/42C01P2004/03C01P2004/51C01P2004/50C01G53/006C01G53/00C01G53/40H01M2004/028H01M4/364H01M4/366H01M10/0525H01M4/505H01M4/485H01M4/362H01M10/052C01G53/44C01G25/02C01P2004/80H01M4/0471H01M4/667H01M2004/021
Inventor 崔权永李尚奕宋定勋南相哲朴锺一
Owner 浦项控股股份有限公司
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