Cathode material and preparation method thereof and lithium-ion battery

A technology for positive electrode materials and substrates, applied in the field of positive electrode materials and their preparation, and lithium-ion batteries, can solve the problems of lithium-ion battery cycle performance attenuation, cycle attenuation, and surface structure damage, achieve high capacity, increase compaction density, and improve The effect of processability

Inactive Publication Date: 2015-12-23
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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AI Technical Summary

Problems solved by technology

[0003] At present, the nickel-cobalt-manganese ternary cathode material on the market is a widely used cathode material for lithium-ion batteries. An effective way to increase the capacity of lithium-ion batteries is to increase the operating voltage of lithium-ion batteries. Generally, the operating voltage of lithium-ion batteries is increased by 0.1 V can increase the capacity of the battery by 5% to 15%. However, after the conventional nickel-cobalt-manganese positive electrode material is used at a voltage exceeding 4.2V, the surface of the positive electrode material will be excessively desorbed. + , causing damage to the surface structure, and at the same time oxidized by the electrolyte, a thick "protective" SEI film is formed on the surface of the positive and negative electrodes to prevent Li + The deintercalation between the positive and negative electrodes macroscopically causes the lithium-ion battery to show a phenomenon of sharp attenuation of cycle performance
[0004] In the prior art, the high-voltage performance of lithium-ion batteries is usually improved from two aspects: the modified electrolyte formula and the surface modification of the positive electrode material. Coating the positive electrode material is a commonly used method at present, but nickel-cobalt-manganese positive electrode materials, especially high-nickel positive electrodes After the material is washed and coated, the cycle will show a sharp attenuation phenomenon

Method used

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preparation example Construction

[0059] The present invention provides a method for preparing the positive electrode material described in the above technical solution, comprising:

[0060] Mixing the compound shown in formula I and the compound shown in formula II to obtain a substrate;

[0061] Li (1+a1) Ni x1 co y1 m z1 o 2 Formula I;

[0062] Li (1+a2) Ni x2 co y2 mn z2 M' (1-x2-y2-z2) o 2 Formula II;

[0063] Among them, -0.1≤a1≤0.12, 0.5

[0064] -0.1≤a2≤0.12, 0

[0065] M and M' are independently selected from one or more of Cu, Zn, Mg, Al, Cd, Zr, Ti, Fe and Mo;

[0066] The compound represented by the formula I has a secondary particle morphology formed by agglomeration of multiple single grains;

[0067] The compound represented by the formula II has a single crystal structure;

[0068] In a solvent, the substrate and the aluminum isopropoxide solution are mixed, and the solvent is evaporated to obtain a coated product;

[0069] The coated ...

Embodiment 1

[0113] Li(Ni 0.8 co 0.1 mn 0.1 )O 2 Granular material:

[0114] will Ni 0.8 co 0.1 mn 0.1 (OH) 2 Mix evenly with lithium hydroxide (LiOH H2O) in a molar ratio of 1:1 to obtain a mixture;

[0115] The mixture was heated to 800°C at a heating rate of 3°C / min for 8 hours in an oxygen atmosphere to obtain a sintered product;

[0116] The sintered product was cooled at a speed of 3° C. / min and then crushed and sieved to obtain Li(Ni 0.8 co 0.1 mn 0.1 )O 2 granular material.

[0117] Prepare Li according to the following method 1.02 (Ni 0.5 co 0.2 mn 0.28 Al 0.02 )O 2 Materials with a single crystal structure:

[0118] will Ni 0.5 co 0.2 mn 0.28 Al 0.02 (OH) 2 and lithium carbonate (Li 2 CO 3 ) are uniformly mixed at a molar ratio of 1:0.5 to obtain a mixed product;

[0119] The mixed product was heated to 930° C. for 6 hours at a rate of 1° C. / min in an oxygen atmosphere to obtain a calcined product;

[0120] The calcined product was cooled at a rate of ...

Embodiment 2

[0126] According to the method described in embodiment 1, Li(Ni 0.8 co 0.1 mn 0.1 )O 2 Particulate material and Li 1.02 (Ni 0.5 co 0.2 mn 0.28 Al 0.02 )O 2 Materials with a single crystal structure;

[0127] The above-mentioned particle size D50 of 80g is Li (Ni 0.8 co 0.1 mn 0.1 )O 2 Particulate material and 20 g of Li with a particle size D50 of 5 μm single crystal structure 1.02 (Ni 0.5 co 0.2 mn 0.28 Al 0.02 )O 2 The materials are mixed to obtain the base material;

[0128] The base material is uniformly dispersed in 100g of ethanol solvent, 1g of aluminum isopropoxide (AIP) alcohol solution with a mass fraction of 5% is added to the obtained dispersion solution, and the solvent is evaporated to dryness with stirring at a temperature of 60°C , to obtain the coated product;

[0129] The coated product was calcined at 550° C. for 8 hours in an air atmosphere, then cooled in a furnace, and passed through a 400-mesh sieve to obtain a positive electrode mate...

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Abstract

The invention provides a cathode material, which comprises a base material and an aluminum oxide layer, wherein the base material is prepared from a compound as shown in a formula I and a compound as shown in a formula II; the compound as shown in the formula I has a secondary particle morphology which is formed by agglomeration of a plurality of single crystal grains; the compound as shown in the formula II has a single-crystal structure; and the aluminum oxide layer coats the surface of the base material. The base material in the cathode material provided by the invention is prepared from the compound with the particle morphology and the compound with the single-crystal structure; due to the two morphologies of compounds, the cathode material has relatively good capacity characteristic; and the processability can also be improved. The aluminum oxide layer coats the surface of the base material in the cathode material provided by the invention; corrosion to the surface layer of the cathode material caused by moisture and HF in a battery can be avoided or reduced by coating of the aluminum oxide layer; and due to the cathode material with an aluminum oxide layer coating layer, the prepared lithium-ion battery has relatively high working voltage and heat stability. The invention further provides a preparation method of the cathode material and the lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Due to its advantages of high energy density, good cycle performance, environmental friendliness and maintenance-free, lithium-ion batteries have replaced traditional batteries on a large scale as new battery energy sources. With the rapid development of electronic information technology and intelligent portable devices, the 3C field represented by digital products such as mobile phones, notebook computers and cameras has put forward higher requirements for the energy density, cycle performance and safety performance of lithium-ion batteries. For lithium-ion batteries, increasing the capacity density of positive electrode active materials can greatly improve the endurance of lithium-ion batteries. [0003] At present, the nickel-cobalt-manganese ternary cathode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 徐杰毛秦钟佘圣贤袁徐俊
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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