Cathode active material, method for preparing the same, and lithium secondary batteries including the same

一种正极活性物质、二次涂覆的技术，应用在活性物质电极、锂蓄电池、非水电解质蓄电池等方向，能够解决涂敷效应未100%地展示、降低电化学特性等问题，达到改善高速性能和服务寿命特性、高容量、增强热稳定性的效果

Active Publication Date: 2014-06-11
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Meanwhile, the inventors of Patent Document 1 describe in Patent Document 3 that since coating is performed by spraying a coating composition for surface treatment while heating a lithium-containing compound, Structural conversion that occurs above, pointing out that the problem of the metal fluoride wet-coating method disclosed in Patent Document 1 etc. at the same time is, "Since the powder of the positive electrode active material after the coating process forms aggregates, the particle size distribution changes, and the The composition and structure of the surface of the positive electrode active material are changed due to excessive contact with water or organic-based solvents, so the coating effect is not exhibited 100%" or when coating is performed by a wet coating method such as in Patent Document 1," Excess lithium is easily dissolved in water or organic solvents and thus causes structural transformation of the positive active material to degrade the electrochemical properties”

Method used

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  • Cathode active material, method for preparing the same, and lithium secondary batteries including the same
  • Cathode active material, method for preparing the same, and lithium secondary batteries including the same
  • Cathode active material, method for preparing the same, and lithium secondary batteries including the same

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preparation example Construction

[0061] 2. Preparation method of positive electrode active material

[0062] The positive electrode active material of the present invention is prepared by a method for preparing a positive electrode active material, the method comprising: preparing a layered structure composite oxide having an excess of lithium manganese represented by the following formula: Li[Li x-z (Ni a co b mn c ) 1-x ]O 2-y f y (wherein, a+b+c=1, 0.05≤x≤0.33, 0≤y≤0.08 and 0

[0063] Production can be performed by various production methods such as a publicly known coprecipitation method and a sol-gel method by which a lithium-manganese-excess layered structure composite oxide is produced, and is not limited to any specific method.

[0064] The primary and secondary coatings can be performed by publicly known surface coating methods as long as ...

Embodiment 1

[0079] ①Synthesis of precursor

[0080] nickel sulfate (NiSO 4 ), cobalt sulfate (CoSO 4 ) and manganese sulfate (MnSO 4 ) was dissolved in water at a ratio of 2:2:6, and the resulting solution was then poured into a 1M sodium hydroxide (NaOH) solution. Ammonia (NH 4 OH) was slowly added to the aforementioned solution in an equivalent ratio equal to that of the metal solution. After the continuous type reactor was used to carry out the reaction for 12 hours or more, the formed precipitate was filtered, then washed several times with an aqueous solution, and dried in a drying oven at 120°C, thereby synthesizing Ni 0.2 co 0.2 mn 0.6 (OH) 2 precursor.

[0081] ② Synthesis of composite oxides with excess lithium manganese

[0082] The precursor nickel cobalt manganese hydroxide (Ni 0.2 co 0.2 mn 0.6 (OH) 2 ) and lithium carbonate (Li 2 CO 3 ) / lithium fluoride (LiF) were mixed at a stoichiometric ratio of 1:1.4, and then the mixture was baked at 700° C. to 900° C. for...

Embodiment 2

[0093] Preparation and evaluation were carried out in the same manner as in Example 1, the difference being that the concentration or material used for coating (0.8wt% AlF 3 +0.29wt%AlPO 4 ) changes, and the results are shown in Table 1 below.

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Abstract

The present invention relates to a cathode active material for a lithium secondary battery, a method for preparing the same, and a lithium secondary battery including the same, and provides a cathode active material including: a lithium manganese-excess layered structure composite oxide represented by Formula Li[Li(NiaCobMnc)<1-x>]O<2-y>F (here, a + b + c = 1, 0.05 <= x <= 0.33, 0 <= y <= 0.08, and 0 < z <= 0.05); a metal fluoride coating layer coated on a surface of the composite oxide; and a metal phosphate coating layer coated on the metal fluoride coating layer.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2012-0140715 filed in the Korean Intellectual Property Office on December 6, 2012, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a positive electrode active material for a lithium secondary battery, a method for preparing the positive electrode active material, and a lithium secondary battery including the positive electrode active material, and more particularly, relates to Technology for double-coating the surface of a layered structure composite oxide with excess lithium manganese with metal phosphate to reduce initial irreversible capacity, enhance high-speed performance, and improve service life characteristics. Background technique [0004] Since lithium secondary batteries are widely used, ranging from small electronic devices to electric vehicles, powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/58
CPCH01M4/50H01M4/1391H01M4/52H01M4/0402H01M4/366H01M4/62H01M4/48Y02E60/122H01M4/131H01M4/1315H01M4/13915H01M4/505H01M4/525H01M4/628H01M10/052H01M2004/028H01M4/582H01M4/5825Y02E60/10
Inventor 金志允金岐泰申东旭沈炯哲李昰渊赵偗任曺海印
Owner SAMSUNG SDI CO LTD
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