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Preparation method of alumina composite nickel-cobalt lithium manganate ternary material

A technology for compounding nickel cobalt lithium manganate and ternary materials, which is applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of uneven dispersion and long coating cycle, and achieves improved rate performance and preparation cycle. Short, the effect of improving the transmission efficiency

Active Publication Date: 2014-03-05
博尔特新材料(银川)有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a preparation method of aluminum oxide-coated nickel-cobalt-lithium manganese oxide ternary material in liquid phase state based on co-precipitation process, which improves the long coating period and uneven dispersion of traditional methods Shortcomings

Method used

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  • Preparation method of alumina composite nickel-cobalt lithium manganate ternary material
  • Preparation method of alumina composite nickel-cobalt lithium manganate ternary material
  • Preparation method of alumina composite nickel-cobalt lithium manganate ternary material

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Embodiment A

[0034] The nickel salt, cobalt salt and manganese salt of this embodiment all use its acetate, the aluminum salt used for coating is aluminum nitrate, the precipitating agent is sodium hydroxide, and the complexing agent is ammonia water. Proceed as follows:

[0035] (1) According to the molar ratio of nickel, cobalt, and manganese of 1:1:1, weigh the acetate of nickel, cobalt, and manganese into a conical flask, add 80 ml of distilled water, shake to dissolve, and prepare solution A.

[0036] (2) According to the molar ratio of (Ni+Co+Mn):NaOH = 1:2.5, weigh the precipitating agent sodium hydroxide into another Erlenmeyer flask, add 50 ml of distilled water to prepare solution B.

[0037] (3) Place the three-neck round bottom flask equipped with a mechanical stirrer and a constant pressure dropping funnel in a 60°C constant temperature water bath, add 5% sodium dodecylbenzenesulfonate solution to the flask, and turn the stirrer speed to Adjust to 300 r / min, and replace the a...

Embodiment B

[0043] The nickel salt of the present embodiment, cobalt salt, manganese salt all adopt its sulfate. The aluminum source used for coating is aluminum acetate, the precipitating agent is sodium carbonate, and the complexing agent is ammonia water. Proceed as follows:

[0044] (1) According to the molar ratio of nickel, cobalt and manganese of 1.1:1.4:1, weigh the sulfate salt of nickel, cobalt and manganese into a conical flask, add 80 ml of distilled water, shake to dissolve, and prepare solution A.

[0045] (2) Press (Ni+Co+Mn): Na 2 CO 3 = 1:4 molar ratio, weigh the precipitating agent sodium carbonate in another conical flask, add 50ml of distilled water to prepare solution B.

[0046] (3) Place a three-neck round bottom flask equipped with a mechanical stirrer and a constant pressure dropping funnel in a constant temperature water bath at 60 °C, add 10% sodium dodecylbenzenesulfonate solution into the flask, and turn the stirrer speed to Adjust to 400 r / min, and replac...

Embodiment C

[0052] The nickel salt, cobalt salt, and manganese salt of the present embodiment all adopt its nitrate. The aluminum source used for coating is aluminum sulfate, the precipitation agent is ammonium bicarbonate, and the complexing agent is ammonia water. Proceed as follows:

[0053] (1) According to the molar ratio of nickel, cobalt, and manganese as 1.5:1.8:1, weigh the nitrate of nickel, cobalt, and manganese into a conical flask, add 80ml of distilled water, shake to dissolve, and prepare solution A.

[0054] (2) According to (Ni+Co+Mn): NH 4 HCO 3 = 1:6.5 molar ratio, weigh the precipitant ammonium bicarbonate in another Erlenmeyer flask, add 50 ml of distilled water to prepare solution B.

[0055] (3) Place a three-neck round bottom flask equipped with a mechanical stirrer and a constant pressure dropping funnel in a constant temperature water bath at 60 °C, add 6% sodium lauryl sulfate solution into the flask, and adjust the speed of the stirrer to 500 r / min, use nit...

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Abstract

The invention provides a preparation method of an alumina composite nickel-cobalt lithium manganate ternary material. The preparation method comprises the following steps: (1), preparing liquor A; (2), preparing liquor B; (3), installing and configuring a reaction flask; (4), adding the liquor A and the liquor B into the reaction flask to participate in hybrid reaction; (5), preparing liquor C, and adding into the flask for reaction; (6), obtaining a precursor by suction-filtering, washing and drying; and (7), mixing and roasting the precursor with a lithium source to prepare the alumina composite nickel-cobalt lithium manganate ternary material. The preparation method disclosed by the invention has the beneficial effects that firstly, liquid-phase coating is adopted, production preparation period is short, efficiency is high, and coating and dispersing are uniform; secondly, the coating layer alumina on the surface of the ternary material is a film with an amorphous structure, so that charging and discharging voltage difference is reduced, multiplying power performance and high-performance performance of the material are improved; and thirdly, characteristics of a solid-liquid phase interface among an anode material, electrolyte and a diaphragm are improved by alumina film-coating, so that velocity and efficiency of electrochemical reaction are improved.

Description

technical field [0001] The invention relates to a preparation method of a nickel-cobalt lithium manganese oxide ternary positive electrode material for a lithium ion battery, in particular to a preparation method of an alumina composite nickel-cobalt lithium manganese oxide ternary material, which belongs to the field of new energy materials. technical background [0002] In 1999, Z L Liu of the National University of Singapore reported for the first time a new type of positive electrode material for lithium-ion batteries, with a structural formula of LiNi x co y mn 1-x-y o 2 . LiNi x co y mn 1-x-y o 2 The structure is similar to LiCoO 2 , for α-NaFeO 2 type layered structure. LiNi x co y mn 1-x-y o 2 With its high specific capacity, low cost, good cycle performance and high safety, it has been closely watched by the lithium battery industry and is considered to be the most likely to completely replace LiCoO 2 s material. After that, Ohzuku, a professor at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1397H01M4/48H01M4/62
CPCY02E60/122H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 龚波林张正国侯春平王利民
Owner 博尔特新材料(银川)有限公司
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