Nickel cobalt lithium manganese oxide positive electrode material and its preparation method and application

A positive electrode material, lithium nickel cobalt manganese technology, applied in the field of preparation of nickel cobalt lithium manganese oxide positive electrode material, can solve the problem of uneven ideal effect of doping elements, and achieve the effect of wide applicability, obvious effect and complete surface structure

Active Publication Date: 2018-11-06
湖南金富力新能源股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The problem of the prior art that the present invention solves is: existing nickel-cobalt-manganese material surface free lithium content is higher; Need to improve its structural stability during use, and conventional simple doping causes the inhomogeneity of doping element to be difficult to reach Ideal effect, so develop a new simple and feasible process method

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  • Nickel cobalt lithium manganese oxide positive electrode material and its preparation method and application
  • Nickel cobalt lithium manganese oxide positive electrode material and its preparation method and application
  • Nickel cobalt lithium manganese oxide positive electrode material and its preparation method and application

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preparation example Construction

[0041] The preferred method for preparing the doped / coated nickel-cobalt lithium manganese oxide positive electrode material in the present invention includes two methods of wet preparation and dry preparation. The semi-finished product of nickel-cobalt-lithium-manganese-manganese-oxide is used as the main body material, and the high-molecular acid polymer is mixed with the semi-finished product of nickel-cobalt-lithium manganese oxide, the compound of doped coating elements and the deionized water added as needed, and then sintered by wet mixing The positive electrode material is prepared by crushing, and the positive electrode material can also be prepared by dry mixing the high molecular acid polymer, the semi-finished product of nickel cobalt lithium manganese oxide, and the doped coating element compound, and then sintering and crushing.

[0042] The preferred wet preparation method of the present invention comprises the steps:

[0043] a) Ingredients, first add the semi-...

Embodiment 1

[0061] Embodiment 1 wet mixing does not doping process (as comparative example)

[0062] Choose 500L plow mixer. Open stirring (20rpm), add the nickel-cobalt-manganese semi-finished product (Li 1.02 Ni 0.33 co 0.33 mn 0.33 o 2 , granularity D 50 : 12.1 μm, active matter content 99.5%), then add 30kg deionized water under the stirring situation, further reduce the speed (3rpm) after stirring for 2h, and stir for 2h discharging to form a paste material with a certain forming degree for subsequent use.

[0063] Put the slurry into a ceramic bowl and put it into a muffle furnace to raise the temperature to 200°C at 5°C / min, keep it warm for 60min, and cool it out.

[0064]Adopt ventilated 24m roller kiln. Set the temperature in the heat preservation zone to 400°C, and under the condition of air (air flow rate 500m 3 / h) Put the material of Example 1 into a ceramic bowl for sintering, heat it for 8 hours, then cool and discharge the material, weigh the weight of the incomin...

Embodiment 2

[0065] Embodiment 2 wet mixing doping process (as comparative example)

[0066] Use 500LY mixer. Turn on stirring (30rpm), add 200kg of nickel cobalt lithium manganate (Li 1.04 Ni 0.4 co 0.3 mn 0.31 o 2 , granularity D 50 : 11 μm, effective matter content 99.5%), then add 100kg deionized water, 0.41kg aluminum hydroxide (industrial grade, particle size D 50 : 2.0 μm, purity 99.5%, content is 700ppm in terms of finished product aluminum content), 0.44kg lanthanum nitrate hexahydrate (industrial grade, purity 98.5% content is 700ppm in terms of finished product lanthanum content), after stirring 2h, further reduce speed (10rpm) Stir for 60 minutes and discharge to form a paste-like material with a certain degree of molding for later use.

[0067] Put the slurry into a ceramic bowl and put it into a muffle furnace to raise the temperature to 400°C at 10°C / min, keep it warm for 100min, and cool it out.

[0068] The difference from the sintering and crushing steps in Exampl...

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Abstract

The invention relates to a Ni-Co lithium manganate positive electrode material and a preparation method and application thereof. The lithium ion battery positive electrode material is formed by sintering raw materials containing a Li-Ni-Co-Mn half-finished product and a macromolecule acid polymer, wherein the content of free lithium ions is lower than 0.025wt%, the chemical formula of the Li-Ni-Co-Mn half-finished product is Li<x>NiCoMn<c>O2, 0.95<=x<=1.08, 0.32<=a<=0.58, 0.05<=b<=0.34, 0.2<=c<=0.46, and (a+b+c) is equal to 1.0-1.05. The preparation method comprises the following steps of mixing raw materials containing the Li-Ni-Co-Mn half-finished product, the macromolecule acid polymer and a doped element compound added according to demand according to a stoichiometric ratio, and performing sintering and smashing to obtain the lithium ion battery positive electrode material. The preparation method is simple in process, the prepared material is good in uniformity, complete in crystal structure and low in free lithium content, the electrochemical performance of a lithium battery is favorably improved, and the commercial application of the lithium ion battery is expanded.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a preparation method and application of a nickel-cobalt lithium manganese oxide positive electrode material. Background technique [0002] In recent years, with the rise of smart phones, smart cars, and new energy vehicles, the requirements for the power energy density and safety of mobile devices are getting higher and higher. At present, the common cathode materials for lithium-ion batteries mainly include lithium cobalt oxide and lithium manganese oxide. , lithium nickel cobalt manganese oxide and lithium iron phosphate. Among them, lithium cobalt oxide is mainly used in the field of 3C small lithium-ion batteries due to limited cobalt storage and safety reasons. Lithium manganate and lithium iron phosphate materials have low energy density, and are gradually being replaced by nickel-cobalt lithium manganate and other low-cobalt materials. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杨亿华钟毅
Owner 湖南金富力新能源股份有限公司
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