Method for preparing high-specific-capacity lithium-enriched lithium battery material

A lithium battery material, high specific capacity technology, used in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of poor and low conductivity, requiring tens of minutes or even hours, and low capacity. The effect of improving cycle stability performance

Inactive Publication Date: 2014-05-21
佛山市兴旺盛电子科技有限公司
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  • Abstract
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Problems solved by technology

Cathode materials currently widely used in the market have their own problems: LiCoO 2 Low capacity, high cost, LiFePO 4 Poor conductivity, actual specific capacity is only 160 mAh / g, ternary LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Affordable price, good rate performance at 3.0-4.3 V but only 150-170 mAh / g capacity
However, the precursor is a carbonate co-precipitate of nickel-cobalt-manganese, which is a poor conductor of microwave absorption. In the low temperature section at the beginning of the reaction, the microwave absorption rate is very low, and it takes tens of minutes or even several hours for the reaction material to change from room temperature to The process of raising to a specified high temperature

Method used

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preparation example Construction

[0032] A preparation method of a high specific capacity lithium-rich lithium battery material, the chemical formula of the high specific capacity lithium-rich lithium battery cathode material is xLi 2 MnO 3 ·(1-x)Li Ni x co y mn 1-x-y o 2 , wherein 0.4≤x≤0.6, 0.2≤y≤0.5, 0.2≤z≤0.35, its preparation method comprises the following steps:

[0033] a. Configure the bottom liquid of the reaction kettle, add a solvent to the nickel source compound, manganese source compound, and cobalt source compound for dissolution, and configure soluble cobalt salt, nickel salt, and manganese salt solutions respectively, with a concentration of 0.5-2.5mol / L, using 30 % of cobalt salt solution, nickel salt solution or manganese salt solution is added to the reactor as the bottom liquid of the reactor;

[0034] b. Prepare co-precipitate, configure a precipitant solution with a concentration of 0.5-2.5mol / L, and add the precipitant solution and the remaining cobalt salt solution, nickel salt sol...

Embodiment 1

[0039] Press 0.4Li 2 MnO 3 0.6LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Weigh a total of 3988 grams of nickel sulfate, manganese sulfate and cobalt sulfate, add 20L deionized water to dissolve completely, and drop Na at a concentration of 2.2mol / L within 1 hour. 2 CO 3 Solution 10L, co-precipitation reaction temperature maintained at 50 ° C, stirring rate 1000rpm coprecipitation reaction for 3 hours.

[0040] The co-precipitation suspension was filtered and washed three times with water, and transferred to a blast drying oven for 6 hours at 100 °C.

[0041] According to the mass ratio of zirconia: coprecipitate (1.5:97.5), Li was added according to the stoichiometric ratio 2 CO 3 , mixed and ball milled for 3 hours.

[0042] The obtained precursor was pressed into a disc with a thickness of 2.5 cm under a pressure of 2 MPa. Place the sample piece in a microwave high-temperature reaction furnace for reaction, and within 5 minutes, the material block absorbs microwaves and heats up t...

Embodiment 2

[0048] Prepare the precursor as in Example 1.

[0049] The obtained precursor was compressed into a tablet under a pressure of 3 MPa, with a thickness of 4 cm. Within 6 minutes, the material block absorbs microwaves and heats up to 800°C; control the microwave heating power, and react with microwaves at 800°C for 2 minutes. After the microwave reaction is completed, the lithium-rich layered positive electrode material is rapidly cooled under the action of air cooling and water cooling, and the obtained sample is fully ball milled. (below with embodiment 1).

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Abstract

The invention discloses a method for preparing a high-specific-capacity lithium-enriched lithium battery material. The high-specific-capacity lithium-enriched lithium battery positive electrode material has a chemical formula of xLi2MnO3.(1-x)LiNixCoyMn(1-x-y)O2, wherein x is more than or equal to 0.4 and less than or equal to 0.6; y is more than or equal to 0.2 and less than or equal to 0.5; z is more than or equal to 0.2 and less than or equal to 0.35. The preparation method comprises the following steps: a, preparing a reaction kettle base solution; b, preparing a coprecipitate; c, preparing a precursor; and d, carrying out a microwave reaction. According to the method provided by the invention, a microwave-sensitive substance zirconia is added into the precursor, the efficiency of absorbing microwaves and converting the microwaves into heat energy through the precursor is improved, and the material synthesis time is obviously shortened. Meanwhile, a lithium-ion conductor Li2ZrO3 can be generated by the microwave-sensitive substance zirconia in the later stage of reaction and achieves an effect of a cladding agent, and the cycling stability of the material is obviously improved.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a preparation method of a lithium-rich lithium battery material with high specific capacity. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high battery voltage, and long storage life. They have been widely used in various portable electronic products and power tools, and play an important role in wind power and solar energy storage power supplies. The energy density and power density of lithium-ion batteries largely depend on the cathode material. Cathode materials currently widely used in the market have their own problems: LiCoO 2 Low capacity, high cost, LiFePO 4 Poor conductivity, actual specific capacity is only 160 mAh / g, ternary LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Moderate price, good rate performance at 3.0-4.3 V but only 150-170 mAh / g capacity. These materials are difficult to meet the needs of high-capacity, high-e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCC01G45/12C01G53/44H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杨刚
Owner 佛山市兴旺盛电子科技有限公司
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