Modification process of lithium ion battery cathode material

A lithium-ion battery, cathode material technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of long time consumption, easy breakage, particle breakage, etc., to improve production safety, stable electrochemical performance, Simple preparation process

Inactive Publication Date: 2019-11-08
青岛多元锂业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the soluble salt of the metal element reacts with the strong alkali precipitant under the action of the complexing agent to form a precursor. The whole process takes a long time and costs high, and the precursor and sintered body generally form a regular shape. Spherical or spherical polycrystalline polymers, such material particles are easy to break, when the material is used in the positive electrode of lithium-ion batteries, it is easy to break the particles during long-term cycle use or charge storage
Even if single-crystal particles can be produced, the particle size is generally below 4um. This type of material is prone to "gas generation" in the process of being used as a battery, causing safety hazards

Method used

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  • Modification process of lithium ion battery cathode material
  • Modification process of lithium ion battery cathode material
  • Modification process of lithium ion battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In step a, soluble nickel sulfate, cobalt sulfate, and manganese sulfate are mixed according to the ratio of the amount of substances in a ratio of 1:1:1, and the mixture is added to a certain amount of pure water to dissolve to obtain a solution; at the same time, a complexing agent and a precipitating agent are added , mixed to obtain a co-precipitate, and the co-precipitate was subjected to solid-liquid separation using a centrifuge to obtain a precursor A;

[0031] Step b, mixing the precursor A with a lithium salt, heating and reacting to form a semi-finished product B;

[0032] Step c, mixing the compound corresponding to the required doping element with the semi-finished product B according to a certain ratio, using a high-mixer to mix evenly, and sintering at a high temperature to obtain the finished product C;

[0033] In step d, the finished product C is mixed with a certain proportion of coating compound, and heat-treated at 550°C for 5 hours to form a coatin...

Embodiment 2

[0045] Step a, mix soluble nickel salt, cobalt salt, and manganese salt according to the ratio of the amount of substances in a ratio of 1:1:1, add the mixture to a certain amount of pure water to dissolve, and obtain a solution; add complexing agent and precipitating agent at the same time , mixed to obtain a co-precipitate, and the co-precipitate was subjected to solid-liquid separation using a centrifuge to obtain a precursor A;

[0046] Step b, mixing the precursor A with a lithium salt, heating and reacting to form a semi-finished product B;

[0047] Step c, mixing the compound corresponding to the required doping element with the semi-finished product B according to a certain ratio, using a high-mixer to mix evenly, and sintering at a high temperature to obtain the finished product C;

[0048] In step d, the finished product C is mixed with a certain proportion of coating compound, and heat-treated at 850°C for 12 hours to form a coating layer on the surface of the sampl...

Embodiment 3

[0061] Step a, mix the soluble nickel salt, cobalt salt, and manganese salt according to the ratio of the amount of the substance at 5:2:3, add the mixture to a certain amount of pure water to dissolve, and obtain a solution; simultaneously add a complexing agent and a precipitating agent , mixed to obtain a co-precipitate, and the co-precipitate was subjected to solid-liquid separation using a centrifuge to obtain a precursor A;

[0062] Step b, mixing the precursor A with a lithium salt, heating and reacting to form a semi-finished product B;

[0063] Step c, mixing the compound corresponding to the required doping element with the semi-finished product B according to a certain ratio, using a high-mixer to mix evenly, and sintering at a high temperature to obtain the finished product C;

[0064] In step d, the finished product C is mixed with a certain proportion of coating compound, and heat-treated at 550°C for 5 hours to form a coating layer on the surface of the sample to ...

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Abstract

The invention belongs to the technical field of a lithium ion battery material, and particularly relates to a preparation method of a lithium ion battery cathode material. The method comprises mixingand dissolving soluble nickel salt, cobalt salt and manganese salt according to a certain stoichiometric ratio, and adding a complexing agent and a precipitating agent to obtain a coprecipitate; carrying out centrifugation to obtain a precursor A, and then, mixing the precursor with lithium salt; carrying out heating and reaction to form a semi-finished product B; adding a doping element and carrying out uniform mixing, and then, carrying out sintering to obtain a finished product C; and then, mixing the finished product with a coating compound and carrying out heat treatment to obtain a finally-required finished product. Through the technical solution above, the cathode material having good single crystal morphology can be obtained through simple treatment; the central particle diameter D50 is more than 4 micrometers; and the preparation process is simple and easy to control, thereby improving electrochemical performance and physical performance of the cathode material, reducing production cost and favoring promotion of new energy batteries in the future.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a modification process of lithium ion battery cathode materials. Background technique [0002] At present, there are two main types of lithium-ion batteries used in the field of new energy vehicles: one is lithium iron phosphate (LFP) battery with positive electrode material, and the other is ternary material battery. Due to the insufficient energy density of lithium iron phosphate, it has gradually been unable to meet the needs of social development; and the high voltage and high energy density of ternary batteries are expected to meet people's needs. [0003] Ternary cathode materials can be synthesized by a series of methods such as high-temperature solid-phase method, sol-gel method, spray drying method, hydrothermal method, and co-precipitation method. Among them, the co-precipitation method is widely used in industrial production because i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 孙玉城
Owner 青岛多元锂业有限公司
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