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Nickel-based multiple components cathode material and its preparation method

A positive electrode material, nickel-based technology, applied in the field of nickel-based multi-element positive electrode materials for lithium-ion secondary batteries and its preparation, can solve the problems of affecting the capacity of positive electrode materials, poor conductivity of the coating layer, poor safety performance, etc., to achieve Prevents direct contact, improves electrical conductivity, and suppresses heat generation

Active Publication Date: 2012-06-13
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some problems are often encountered in the surface coating of positive electrode materials, such as: CN101162777A discloses a high-power aluminum-plastic flexible packaging lithium-ion battery, but its coating layer has poor conductivity, which affects the capacity of the positive electrode material. Performance also becomes worse; CN1773763A discloses a lithium-ion secondary battery with a nickel-based positive electrode active material and its preparation method, which has good electrical conductivity but poor safety performance

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  • Nickel-based multiple components cathode material and its preparation method

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Embodiment 1

[0024] The nickel-based multi-element positive electrode material of the present embodiment, its chemical formula is

[0025] Li 1.04 Ni 0.75 co 0.15 al 0.10 o 2 / (0.4Li 3 PO 4 0.6Al 2 o 3 ) 0.003 , in powder form.

[0026] Its preparation method:

[0027] (1) Weigh Ni 0.75 co 0.15 al 0.10 (OH) 2 The indicated nickel-based compound (average particle size D50=10.0μm measured by laser particle size analyzer, tap density is 2.05g / cm 3 , powder particles are spherical) 280.00g and lithium hydroxide monohydrate (purity 95%) 144.7g, mix, put the mixture in a muffle furnace, pre-fire at 500°C for 6h, then heat up to 700°C for sintering for 12h, After cooling, it is crushed and sieved to obtain a chemical formula of Li 1.04 Ni 0.75 co 0.15 al 0.10 o 2 represented by Compound A;

[0028] (2) Weigh 0.28g of lithium carbonate, 0.29g of ammonium dihydrogen phosphate, add 30g of water, and prepare Li 3 PO 4 Suspension B;

[0029] (3) Weigh 2.85 g of aluminum nitrate...

Embodiment 2

[0034] The nickel-based multi-element positive electrode material of the present embodiment, its chemical formula is

[0035] Li 1.08 Ni 0.8 co 0.1 mn 0.1 o 2 / (0.5Li 3 PO 4 0.5ZrO 2 ) 0.010 , in powder form.

[0036] Its preparation method:

[0037] (1) Weigh Ni 0.8 co 0.1 mn 0.1 (OH) 2 Represented nickel-based compound (average particle size D50=8.0μm measured by laser particle size analyzer, tap density 1.8g / cm 3 , powder particles spherical) 280.00g and lithium hydroxide monohydrate (purity 95%) 143.1g, mix, put the mixture in a muffle furnace, pre-fire at 400°C for 4h, then heat up to 800°C for sintering for 4h, cool After crushing and sieving, the chemical formula obtained is Li 1.08 Ni 0.8 co 0.1 mn 0.1 o 2 represented by Compound A;

[0038] (2) Weigh 1.35g lithium hydroxide monohydrate (purity 95%), 1.35g diammonium hydrogen phosphate, add 30g water, and prepare Li 3 PO 4 Suspension B;

[0039] (3) Weigh 4.39 g of zirconium nitrate pentahydrate,...

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Abstract

The invention relates to a nickel-based multiple components cathode material and its preparation method, a chemical formula of the nickel-based multiple components cathode material is LiaNixCoyM1-x-yO2 / (zLi3PO4(1-z)M')b; M in the chemical formula is one or more than two elements selected from Mn, Al, Zr, Ba, Sr and B, M' is one or more than two oxidate selected from Al, Zr, Ti, Mg and La, wherein 0.8<=a<=1.2, 0.7 <x<1, 0<y<1, x+y<1, 0<z<1, 0<b<0.05. The invention also provides a preparation method of the nickel-based multiple components cathode material. The nickel-based multiple components cathode material is characterized in that lithium phosphate and metal oxide are used for carrying out compound coating treatment on the surface, the interfacial resistance can be minimized, the conductivity performance of the surface lithium ion can be increased, the nickel-based multiple components cathode material can be protected, the generation of phase transformation of the nickel-based multiple components cathode material can be inhibited, simultaneously, the heating can be inhibited, the thermal stability can be enhanced, the capacity of the lithium ion secondary cell prepared by the product is high, and the security is good.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion secondary battery and a preparation method thereof, in particular to a nickel-based multi-element positive electrode material for a lithium ion secondary battery and a preparation method thereof. Background technique [0002] At present, commercial lithium-ion batteries mostly use lithium cobalt oxide (LiCoO 2 ) The positive electrode active material is used as the positive electrode, with LiCoO 2 As a positive electrode material, the electrode processing performance is good, the specific capacity is high, and it has very good cycle performance, but cobalt resources are poor, and cobalt compounds are expensive, and the cost is very high. The properties of nickel and cobalt are similar, and the content of nickel in nature is more abundant than that of cobalt. The price of nickel is lower than that of cobalt, and its toxicity is also lower. In contrast, under the same charge and d...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCY02E60/122Y02E60/10
Inventor 赵艳敏李旭袁荣忠王志兴
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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