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Positive electrode material of high-nickel lithium ion battery, preparation method of positive electrode material and lithium ion battery comprising positive electrode material

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of irregular structure, low energy density of materials, mixed cations of materials, etc. High density, reducing the effect of cation mixing

Active Publication Date: 2014-11-19
BTR NEW MATERIAL GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can be used to remove lithium salts on the surface of high-nickel materials, thereby reducing the pH value of the material, this method cannot fundamentally solve the material cation mixing, the structure is irregular, and the reaction of the material with carbon dioxide leads to loss of lithium and low energy density of the material. And other issues

Method used

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  • Positive electrode material of high-nickel lithium ion battery, preparation method of positive electrode material and lithium ion battery comprising positive electrode material
  • Positive electrode material of high-nickel lithium ion battery, preparation method of positive electrode material and lithium ion battery comprising positive electrode material
  • Positive electrode material of high-nickel lithium ion battery, preparation method of positive electrode material and lithium ion battery comprising positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Weigh 0.4035kg of lithium carbonate and 1kg of nickel-cobalt-aluminum precursor Ni 0.8 co 0.15 al 0.05 (OH) 2 Pour it into the mixer, load 3kg zirconia balls at the same time, and mix at a speed of 7r / min for 5 hours; after mixing evenly, weigh 0.146kg of sodium peroxide and quickly mix it in, and continue to mix in the mixer at a speed of 7r / min for 0.5 h; After mixing evenly, take out the zirconia balls and sinter at a high temperature of 700°C, during which air is introduced at 6L / h. After sintering for 20 hours, the material is cooled to room temperature, and crushed through a 200-mesh sieve to obtain 1.02kg of lithium nickel cobalt aluminate; Pour the nickel-cobalt-lithium-aluminate powder into 3L of water and stir at room temperature for 3 hours, then centrifuge at 2000rpm for 40 minutes, remove the upper solution, and dry the solid slurry at 120°C for 15 hours to obtain the positive electrode material nickel-cobalt lithium aluminate LiNi 0.8 co 0.15 al 0.05 ...

Embodiment 2

[0049] Weigh 0.1658kg lithium hydroxide and 1kg nickel cobalt manganese precursor Ni 0.90 co 0.05 mn 0.05 C 2 o 4 Pour it into the mixer, load 4kg polyurethane balls at the same time, and mix at a speed of 15r / min for 10h; after mixing evenly, weigh 0.287kg of the mixture of sodium peroxide and rubidium peroxide and mix it quickly, and continue to mix it in the mixer at 10r / min. Mix at a speed of min for 1 hour; after mixing evenly, take out the polyurethane balls and sinter at a high temperature of 850°C, during which oxygen is introduced at 4L / h. After sintering for 20 hours, the material is cooled to room temperature and crushed through a 200-mesh sieve to obtain 1.13kg of nickel-cobalt manganese acid Lithium: Pour nickel-cobalt lithium manganate powder into 5L water and stir at room temperature for 2 hours, then centrifuge at 2500rpm for 30 minutes, remove the upper solution, and dry the solid slurry at 200°C for 10 hours to obtain the positive electrode material lithiu...

Embodiment 3

[0051] Weigh 0.5507kg of lithium acetate and 1kg of nickel-cobalt-manganese precursor Ni 0.70 co 0.15 mn 0.15 CO 3 Pour into a mixer and mix for 8 hours at a speed of 10r / min; after mixing evenly, weigh 0.225kg of a mixture of sodium peroxide and potassium peroxide and quickly mix it into it, and continue mixing in the mixer for 0.5h at a speed of 10r / min; mix After uniformity, it was sintered at a high temperature of 650°C, and air was introduced at 6L / h during the period. After sintering for 30 hours, the material was cooled to room temperature and crushed through a 200-mesh sieve to obtain 1.03kg nickel-cobalt lithium manganese oxide; pour the nickel-cobalt lithium manganese oxide powder Put into 5L of water and stir at room temperature for 2h, then centrifuge at 3000rpm for 25min, remove the upper layer solution, and dry the solid slurry at 300°C for 6h to obtain the positive electrode material nickel cobalt lithium manganate LiNi 0.70 co 0.15 mn 0.15 o 2 .

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Abstract

The invention discloses a preparation method of a positive electrode material of a high-nickel lithium ion battery. The preparation method comprises the following steps of uniformly mixing a certain quantity of oxygenates M2O2 (M is one of Na, K, Cs and Rb) into a mixture of a high-nickel precursor and lithium salt, performing high-temperature sintering, and clearing away salt and alkali which are retained on the surface of the material through distilled water. Compared with the prior art, the preparation method has the advantages that the oxygenates M2O2 absorb carbon dioxide and reduce generation of the lithium salt on the surface of the material; furthermore, oxygen generated by the reaction of the oxygenates and carbon dioxide can be in full contact with raw materials, so that mixing of positive ions of the material is reduced, and the material structure is regular and ordered; finally the material is cleaned through the distilled water; therefore, on one hand, impurities are removed, and on the other hand, the pH value of the material is reduced; the processing performance and the safety of the material are improved.

Description

technical field [0001] The present invention relates to the technical field of lithium-ion batteries, in particular, the present invention relates to a high-nickel-containing cathode material for a lithium-ion battery, a preparation method thereof, and a lithium-ion battery containing the same. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high discharge platform, long cycle life, and no memory effect. They have been widely used in mobile phones, cameras, notebook computers and other fields. At the same time, they have also begun to be used in power batteries such as electric bicycles and electric vehicles. Lithium cobalt oxide cathode material is the earliest cathode material to be commercialized, but cobalt resources are limited, expensive, and polluted, which limits its further development. High nickel content cathode material LiNi x m 1‐x o 2 (where 0.6≤x≤1, M is one or more of Co, Mn, Al, Mg, Ti, V, Cr, Zr, Nb, Ga, Sr...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/131H01M10/0525
CPCH01M4/525H01M10/0525Y02E60/10
Inventor 张欣鹏杨顺毅黄友元任建国李胜
Owner BTR NEW MATERIAL GRP CO LTD
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