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Lithium ion secondary cell lithium cobaltate cathode material, manufacture method and application thereof

A technology of lithium ion battery and cathode material, applied in the field of lithium ion secondary battery, can solve the problems of poor cycle stability of lithium cobalt oxide cathode material, deterioration of cycle stability of lithium cobalt oxide cathode material and the like

Inactive Publication Date: 2016-09-14
GUIZHOU ZHENHUA E CHEM INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is: under the application of high voltage ≥ 4.30V, the cycle stability of the lithium cobaltate positive electrode material becomes worse with the increase of the charge cut-off voltage, especially when the charge cut-off voltage is ≥ 4.4V, the cobalt oxide The cycle stability deterioration of lithium cathode materials is particularly serious

Method used

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  • Lithium ion secondary cell lithium cobaltate cathode material, manufacture method and application thereof
  • Lithium ion secondary cell lithium cobaltate cathode material, manufacture method and application thereof
  • Lithium ion secondary cell lithium cobaltate cathode material, manufacture method and application thereof

Examples

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Effect test

Embodiment 1

[0081] Example 1 Preparation of positive electrode material

[0082] The average expression with D50 of 25 μm is Li 1.11 co 0.98 al 0.02 o 2.055 The lithium cobalt oxide semi-finished product is used as the core material for coating.

[0083] The coating method is as follows: 1000g of deionized water is dropped into 7g of nickel acetate (containing tetra-crystal water), 15g of manganese acetate (containing di-crystal water), and a solid content of 10wt.% nano Y 2 o 3 Dispersion liquid 6.5g, stirred for 15min to completely dissolve the acetate, add 500g of core material, slowly drop in LiOH solution with a content of 5wt.%, control the dropping speed, gradually increase the pH value to 13 in 15 minutes, stop dripping Add LiOH solution, continue stirring for 30 minutes, filter out the liquid, dry the filtered material at 120°C for 10 hours, then use a muffle furnace to raise the temperature to 900°C at a rate of 8°C / min (25L / min air atmosphere), constant temperature sinter...

Embodiment 2

[0107] Example 2 Preparation of positive electrode material

[0108] The average expression using D50 of 5 μm is Li 1 co 0.98 Mg 0.02 o 1.99 The lithium cobalt oxide semi-finished product is used as the core material for coating.

[0109] The coating method is as follows: mix 1kg core material with 0.62g nano-NiCO 3 , 1.46g nanometer MnCO 3 , 0.33g Li 2 CO 3 , 1.27g nano-Y 2 o 3 and 1.67g nano TiO 2Put it into a ball mill for ball milling, so that various components are evenly coated on the surface of the core material, and then the material is heated to 900°C (25L / min air atmosphere) with a muffle furnace at a heating rate of 8°C / min, and sintered at a constant temperature for 24 hours , cooled naturally, and the lithium-poor coated lithium cobalt oxide cathode material was prepared.

[0110] Wherein, the preparation method of the core material is similar to the first embodiment, only the doping raw material is replaced with magnesium oxide, and the sintering tempe...

Embodiment 3

[0116] Example 3 Preparation of positive electrode material

[0117] The average expression for Li with a D50 of 20 μm 1.08 co 0.98 Zr 0.02 o 2.05 The lithium cobalt oxide semi-finished product is used as the core material for coating.

[0118] The coating method is as follows: mix 1kg core material with 6.2g nano-NiCO 3 , 14.6 g nanometer MnCO 3 , 3.3g Li 2 CO 3 , 1.89g nano-Al 2 o 3 , 1.67g nanometer MgO and 1.67g nanometer TiO 2 Put it into a ball mill for ball milling, so that various components are evenly coated on the surface of the core material, and then the material is heated to 950°C (25L / min air atmosphere) at a heating rate of 8°C / min in a muffle furnace, and sintered at a constant temperature for 4 hours , cooled naturally, and the lithium-poor coated lithium cobalt oxide cathode material was prepared.

[0119] Wherein, the preparation method of the core material is similar to the first embodiment, only the doping raw material is replaced with zirconia,...

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Abstract

The present invention relates to a lithium ion secondary cell lithium cobaltate cathode material, a manufacture method and application thereof. The cathode material includes a core material and a wrapping layer. The core material is LixCo(1-y)AyO(2+z), wherein X is greater than or equal to 1.0 and less than or equal to 1.11, y is greater than or equal to 0 and less than or equal to 0.02, and z is greater than -0.2 and less than 0.2. A is selected from one or more than two elements among Al, Mg, Y, Zr and Ti. The wrapping layer is LiaMbBcOd, wherein M is a lithium ion active metal element, and is selected from one or more than two elements among Co, Ni, Mn and Mo, B is a non-active element and is selected from one or more than two elements among Al, Mg, Ti, Zr and Y, and b+c is greater than 0.95 and less than 2.5. A molar ratio a / b of Li to the active metal element M is greater than zero and less than 1. The cell prepared by the cathode material has the advantages of high capacity and compactness density, and good cyclic stability under high voltage.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, mainly relates to lithium cobalt oxide cathode materials for lithium-ion secondary batteries and their preparation methods and applications, in particular to lithium-ion secondary battery lithium cobalt oxide cathode materials suitable for high-voltage environments and Its formulation and application. Background technique [0002] With the continuous improvement of the energy density requirements of lithium-ion secondary batteries by the application side, the charging cut-off voltage of lithium cobalt oxide has also increased from the early 4.2V to the current 4.35V, and the compaction density has also been optimized from the early stage through particle size matching optimization. 3.80g / cm 3 Increased to the current 4.15g / cm 3 above. Increasing the charge cut-off voltage to increase the lithium ion deintercalation degree of the lithium cobalt oxide layered structure to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/525H01M4/505H01M4/131H01M4/1391
CPCH01M4/131H01M4/1391H01M4/366H01M4/505H01M4/525H01M10/0525H01M4/0471Y02E60/10C01G51/42C01G53/42C01P2002/74C01P2004/61C01P2004/84H01M4/485
Inventor 李路吴兴平付茂刚胡安生梅铭黄昕向黔新
Owner GUIZHOU ZHENHUA E CHEM INC
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