High-nickel positive active material of surface-modified lithium ion battery and preparation method of positive active material

A cathode active material, lithium-ion battery technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve problems such as inability to reduce alkalinity, and achieve simple and easy modification methods, moisture absorption Problem Solving, Solving the Effect of Water Absorption by Alkaline Substances

Active Publication Date: 2012-12-19
HUNAN CHANGYUAN LICO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The coatings used, such as MgO (see Chinese Patent Document No. CN1770514A), AlF3 (see B.-C. Park, H.-B. Kim, H.J. Bang, J. Prakash, Y.-K. Sun, Industrial & Engineering Chemistry Research 47 (2008): 3876-3882), AlPO4 (see B. Kim, C. Kim, T.-G. Kim, D. Ahn, B. Park, Journal of The Electrochemical Society153(2006): A1773-A1777 and No. CN1416189A Chinese Patent Literature) and conductive glass (referring to CN1797822A and CN1773763A No. Chinese Patent Literature), etc., although the electrical conductivity of the material can be improved to a certain extent Chemical stabi

Method used

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  • High-nickel positive active material of surface-modified lithium ion battery and preparation method of positive active material
  • High-nickel positive active material of surface-modified lithium ion battery and preparation method of positive active material
  • High-nickel positive active material of surface-modified lithium ion battery and preparation method of positive active material

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Experimental program
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Effect test

Embodiment 1

[0032] A surface-modified lithium-ion battery high-nickel positive electrode active material of the present invention, its matrix material is high-nickel positive electrode active material LiNi 0.8 co 0.15 al 0.05 o 2 , where the Al element can be replaced by one or more of Al, Mn, Mg, Ti; the surface of the matrix material is evenly coated with a lithium ion conductor compound, and the lithium ion conductor compound is LiAlO 2 ; The content of the total impurity lithium in the high-nickel positive electrode active material of the surface-modified lithium-ion battery is 0.083%, which is 0.27 times that before modification. The impurity lithium salt in the present embodiment refers to Li 2 CO 3 and LiOH as the main component of the basic impurities, the content of the total lithium impurities refers to the basic impurities Li 2 CO 3 and the mass content of lithium in LiOH. Before modification, the matrix material LiNi 0.8 co 0.15 al 0.05 o 2 The content of total impu...

Embodiment 2

[0041] A surface-modified lithium-ion battery high-nickel positive electrode active material of the present invention, its matrix material is high-nickel positive electrode active material LiNi 0.8 co 0.15 al 0.05 o 2 , where the Al element can be replaced by one or more of Al, Mn, Mg, Ti; the surface of the matrix material is evenly coated with a lithium ion conductor compound, and the lithium ion conductor compound is LiAlO 2 ; The content of the total impurity lithium in the high-nickel cathode active material of the surface-modified lithium-ion battery is 0.0847%, which is 0.28 times that before modification. The impurity lithium salt in the present embodiment refers to Li 2 CO 3 Alkaline impurities with LiOH as the main components; the content of total impurity lithium refers to the alkaline impurities Li 2 CO 3 and the mass content of lithium in LiOH.

[0042] The preparation method of the surface-modified lithium-ion battery high-nickel positive electrode active ...

Embodiment 3

[0048] In this example, the coating additive in Example 2 was changed to micron-sized aluminum hydroxide (1 μm-2 μm); other preparation processes and process parameters were the same as in Example 2.

[0049] After surface modification, the lithium-ion high-nickel positive electrode active material LiNi prepared in this embodiment 0.8 co 0.15 Al 0.05 o 2 The pH value dropped from 12.2 to 11.9, and the content of total impurity lithium in surface alkaline substances was 0.36 times that before modification. From the effect of reducing alkalinity, this embodiment is slightly worse than embodiment 1 and embodiment 2.

[0050] Figure 11 LiNi in this example 0.8 co 0.15 Al 0.05 o 2 Modified SEM photos; from Figure 11 It can be seen that some fine powder remains on the surface of the positive electrode material.

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Abstract

The invention discloses a high-nickel positive active material of a surface-modified lithium ion battery. A matrix substance is the high-nickel positive active material LiNixCoyMzO2, the surface of the matrix substance is uniformly coated by a lithium-ion conductor compound which comprises at least one of LiAlO2, Li4Ti5O2 and Li2ZrO3; the content of the total impurity lithium in the positive active material is below 0.085%. The invention also discloses a preparation method of the positive active material. The preparation method comprises the following steps of: firstly mixing the matrix substance with an organic solution containing aluminum, an organic solution containing titanium or an organic suspension liquid containing aluminum/titanium/zirconium, drying, calcining the dried mixture, finally generating the lithium-ion conductor compound on the surface of the matrix substance, namely the high-nickel positive active material of the surface-modified lithium ion battery. The high-nickel positive active material disclosed by the invention has the advantages that the content of alkali substances is obviously reduced, the processing performance of the material is improved, and the electrochemical stability is improved.

Description

technical field [0001] The invention relates to a battery cathode material and a preparation method thereof, in particular to a lithium ion battery cathode active material and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries have been widely used in various mobile electronic products, power tools and energy storage systems. In order to adapt to the development of these devices, there is an increasing demand for lithium-ion batteries with high energy density, high power, long life and low cost. Lithium-ion cathode materials are the key materials that affect battery performance and cost. However, the current commercial applications of lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphate are difficult to make breakthroughs in specific capacity, while doped lithium nickel oxide cathode materials The material has attracted attention because of its high capacity and low cost, and is expected to become the market-le...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/62H01M4/131B82Y30/00
CPCY02E60/122Y02E60/10
Inventor 黄承焕周友元周新东周耀李厦
Owner HUNAN CHANGYUAN LICO CO LTD
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