Preparation method of surface covered nickel lithium manganate positive electrode material

A technology of lithium nickel manganate and cathode material, which is applied in the field of preparation of lithium nickel manganate cathode material to achieve the effect of shortening microwave firing time, improving cycle performance and rate performance

Active Publication Date: 2014-05-14
威海区域创新中心有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing literature shows that although the coating materials used can improve the electrochemical performance of lithium nickel manganese oxide materials, they are all poor conductors of microwaves.

Method used

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  • Preparation method of surface covered nickel lithium manganate positive electrode material
  • Preparation method of surface covered nickel lithium manganate positive electrode material
  • Preparation method of surface covered nickel lithium manganate positive electrode material

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preparation example Construction

[0031] A preparation method of a surface-coated lithium nickel manganese oxide positive electrode material, comprising the following steps:

[0032] a. Configure the bottom liquid of the reaction kettle, add a solvent to the nickel source compound and the manganese source compound to dissolve, according to the stoichiometric ratio LiNi of lithium nickel manganese oxide 0.5 mn 1.5 o 4 Configure soluble nickel salt and manganese salt solutions respectively, and add 30% nickel salt solution or manganese salt solution into the reactor as the bottom liquid of the reactor;

[0033] b. Prepare co-precipitate, configure a precipitant solution with a concentration of 0.5-2.5mol / L, add the precipitant solution and the above-mentioned remaining nickel salt solution or manganese salt solution into the bottom liquid of the reaction kettle in a drop-by-drop manner and stir to generate a co-precipitant solution. Precipitation reaction to obtain a co-precipitation mixture, the addition rate...

Embodiment 1

[0042] Take by weighing 1314g nickel sulfate, 2265g manganese sulfate respectively, after adding 20L deionized water to dissolve completely, drip concentration is 2mol / L (NH 4 ) 2 CO 3 Solution until the precipitation is complete, the co-precipitation reaction temperature is maintained at 50°C, the stirring rate is 1000rpm, and the co-precipitation reaction is carried out for 3 hours.

[0043] The precipitate was filtered and washed three times with water, and then transferred to a blast drying oven at 100° C. for drying for 6 hours. Take zirconia according to the mass ratio: nickel-manganese coprecipitate (3:97), and weigh Li according to the stoichiometric ratio 2 CO 3 , mixed and ball milled for 3 hours.

[0044] The resulting precursor was made into a disc under a pressure of 2 MPa with a thickness of 2 cm. Place the sample piece in a microwave high-temperature reaction furnace to react, and within 8 minutes, the material block absorbs microwaves and heats up to 800°C...

Embodiment 2

[0047] Weigh 442g of nickel acetate and 1298g of manganese acetate respectively, add 10L of deionized water to dissolve completely, and drop Na at a concentration of 1.5mol / L within 0.5 hours. 2 CO 3 Solution until the precipitation is complete, the co-precipitation reaction temperature is maintained at 50°C, the stirring rate is 600rpm, and the co-precipitation reaction is carried out for 3 hours.

[0048] The precipitate was filtered and washed three times with water, and then transferred to a blast drying oven at 100° C. for drying for 6 hours. Take zirconia according to the mass ratio: nickel-manganese coprecipitate (2:98), and weigh Li according to the stoichiometric ratio 2 CO 3 , mixed and ball milled for 3 hours.

[0049] The obtained precursor was made into a disc with a thickness of 3 cm under a pressure of 2 MPa. Place the sample piece in a microwave high-temperature reaction furnace to react, and within 8 minutes, the material block absorbs microwaves and hea...

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Abstract

The invention discloses a preparation method of a surface covered nickel lithium manganate positive electrode material. The preparation method comprises the following steps: a, preparing a reaction kettle bottom solution; b, preparing a coprecipitate; c, preparing a precursor; and d, performing a microwave reaction. The preparation method of the surface covered nickel lithium manganate positive electrode material provided by the invention has the advantages that as a microwave sensitized material, zirconia, is added in a precursor preparation process, a reaction material is urged to effectively absorb microwave to rapidly warm to the reaction temperature 700-950 DEG C, and the microwave firing time of the product is remarkably shortened to 1-10 minutes; when the nickel lithium manganate material is burnt at high temperature, the zirconia and a Li source can react at a nickel lithium manganate surface to generate a lithium ion conductor Li2ZrO3 coating layer, and thus the cycle property and the rate property of the product are remarkably improved.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a method for preparing a surface-coated lithium nickel manganese oxide cathode material. Background technique [0002] Spinel lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) was developed on the basis of lithium manganate, with a reversible capacity of 146.7 mAh / g and a voltage platform of about 4.7V, which is more than 15% higher than the 4 V voltage platform of lithium manganate. The cycle stability at high temperature is higher than that of The original lithium manganate has been qualitatively improved. Lithium nickel manganese oxide is therefore considered to be the most promising anode material for high potential lithium ion batteries. Compared with lithium battery cathode materials currently used in the market, lithium nickel manganese oxide has higher output voltage, lower cost, and environmental friendliness than lithium cobalt oxide; the cycle stability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCC01G45/12C01G53/50H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 杨刚
Owner 威海区域创新中心有限责任公司
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