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High-nickel multi-element positive electrode material for lithium secondary battery, and preparation method thereof

A lithium secondary battery and cathode material technology, applied in secondary batteries, battery electrodes, electrical components, etc., can solve problems such as low initial discharge capacity, poor processing performance, and poor high-temperature storage performance, and achieve excellent abnormal temperature electrochemistry Good performance, good cycle performance, storage performance and good processing performance

Active Publication Date: 2015-11-18
HUNAN SHANSHAN NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The material obtained by this method has excellent electrochemical performance and storage performance, but poor high-temperature storage performance
[0005] CN201110456525 Chinese patent discloses a Li 3 PO 4 Nickel-based multi-component materials coated with metal oxides have good material safety, but low initial discharge capacity and poor processing performance

Method used

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  • High-nickel multi-element positive electrode material for lithium secondary battery, and preparation method thereof
  • High-nickel multi-element positive electrode material for lithium secondary battery, and preparation method thereof
  • High-nickel multi-element positive electrode material for lithium secondary battery, and preparation method thereof

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Embodiment 1

[0036] A high-nickel multi-element positive electrode material for a lithium secondary battery of the present invention, comprising a base material and a composite cladding layer outside the base material, the base material being the positive electrode material Li 1.05 Ni 0.8 co 0.1 mn 0.1 o 2 ; The composite coating layer uniformly coated on the outer surface of the substrate is a mixture of lithium zirconium oxide and lithium phosphorus oxide. Lithium zirconium oxide is Li 2 ZrO 3 , Li 6 Zr 2 o 7 and Li 4 ZrO 4 . Lithium phosphorus oxide is Li 3 PO 4 .

[0037] The content of the total impurity lithium on the surface of the high-nickel multi-element positive electrode material surface after the surface modification of the present embodiment is 0.070%, which is 0.32 times that before modification, and the Li in the total impurity lithium 2 CO 3 and LiOH content are 0.195% and 0.115%, respectively.

[0038] The preparation method of the high-nickel multi-elemen...

Embodiment 2

[0074] A high-nickel multi-component positive electrode material for a lithium secondary battery of the present invention, comprising a base material and a composite coating layer outside the base material, the base material being a binary positive electrode material Li 1.07 Ni 0.815 co 0.15 al 0.035 o 2 The composite coating layer uniformly coated on the outer surface of the substrate is a mixture of lithium zirconium oxide, lithium titanium oxide, lithium aluminum oxide and lithium phosphorus oxide. Lithium zirconium oxide is Li 2 ZrO 3 , lithium titanium oxide is Li 2 TiO 3 , lithium aluminum oxide is LiAlO 2 , the lithium phosphorus oxide is Li 3 PO 4 .

[0075] The content of the total impurity lithium on the surface of the high-nickel multi-element positive electrode material surface after the surface modification of this embodiment is 0.072%, which is 0.21 times that before modification, and the content of the total impurity lithium is the remaining Li on the ...

Embodiment 3

[0082] A high-nickel multi-component positive electrode material for a lithium secondary battery of the present invention, comprising a base material and a composite coating layer outside the base material, the base material being a binary positive electrode material Li 1.04 Ni 0.8 co 0.2 o 2 ; The composite coating layer uniformly coated on the outer surface of the substrate is a mixture of lithium zirconium oxide, lithium aluminum oxide and lithium phosphorus oxide. Lithium zirconium oxide is Li 2 ZrO 3 , lithium aluminum oxide is LiAlO 2 , the lithium phosphorus oxide is Li 3 PO 4 and Li 4 P 2 o 7 .

[0083] The content of the total impurity lithium on the surface of the high-nickel multi-element positive electrode material surface after the surface modification of this embodiment is 0.059%, which is 0.32 times that before modification, and the content of the total impurity lithium is the remaining Li on the surface of the substrate. 2 CO 3 and lithium element c...

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Abstract

A high-nickel multi-element positive electrode material for a lithium secondary battery comprises a base material and a composite cladding layer outside the base material, the general formula of the base material is LiaNi1-x-yCoxMyO2, wherein M is at least one of Mn and Al, a, x and y respectively represent the molar ratios of Li, Co and M in the base material, a is not smaller than 1 and not greater than 1.2, 1-x-y is not smaller than 0.6 and not greater than 1, x is greater than 0 and not greater than 0.4, and y is not smaller than 0 and not greater than 0.4; and the composite cladding layer is a mixture containing lithium phosphorus oxide and at least one of lithium zirconium / lithium titanium / lithium aluminum oxides. A preparation method of the positive electrode material comprises the following steps: preparing the base material; adding a metallic Zr / Ti / Al-containing compound, and carrying out high temperature heat treatment to obtain a lithium zirconium / lithium titanium / lithium aluminum oxide coated base layer; and adding phosphate, and carrying out low temperature heat treatment to obtain the high-nickel multi-element positive electrode material for the lithium secondary battery. The high-nickel multi-element positive electrode material has the advantages of low alkalinity, small gas swelling degree, good processability and good electrochemical performances.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium battery and a preparation method thereof, in particular to a high-nickel positive electrode material for a lithium secondary battery and a preparation method thereof. Background technique [0002] The rapid development of science and technology has increased people's demand for mobile power. Compared with traditional secondary batteries, lithium-ion secondary batteries have the advantages of high voltage, small size, high energy density, long service life, low self-discharge, wide operating temperature range, short charge and discharge time, no environmental pollution, and no memory effect It has been widely used in modern digital products such as mobile phones and notebook computers, and large-capacity lithium-ion batteries have also begun to be used in electric vehicles. In lithium-ion batteries, the performance of the positive electrode material determines the performance of the e...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 周惠李旭蒋湘康谭欣欣王志兴彭文杰袁荣忠李智华
Owner HUNAN SHANSHAN NEW ENERGY CO LTD
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