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Ternary positive electrode material of lithium ion battery, preparation method of ternary positive electrode material and lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in the direction of battery electrodes, positive electrodes, electrical components, etc., to achieve good mechanical strength, facilitate the insertion/extraction process, and high capacity effects

Active Publication Date: 2021-03-16
HUIZHOU BYD IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present disclosure is to provide a ternary cathode material with better mechanical strength and electrochemical performance in order to overcome the problems existing in the mechanical strength and electrochemical performance of the existing ternary cathode materials

Method used

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  • Ternary positive electrode material of lithium ion battery, preparation method of ternary positive electrode material and lithium ion battery
  • Ternary positive electrode material of lithium ion battery, preparation method of ternary positive electrode material and lithium ion battery
  • Ternary positive electrode material of lithium ion battery, preparation method of ternary positive electrode material and lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0051] a. Choose n 镍 :n 钴 :n 锰 =0.8:0.1:0.1 ratio, using nickel sulfate, cobalt sulfate, and manganese sulfate as raw materials to make a mixed solution with a total metal ion concentration of 2mol / L; configure 2mol / L NaOH solution as a precipitant; configure 2mol / L ammonia water as a complexing agent.

[0052] b. Take the mixed metal ion solution as the mother liquor, add sodium hydroxide solution and ammonia solution to it at a certain speed, control the pH of the reaction system to be 10.5 by adjusting the valve and flow meter, the reaction temperature is 55°C, the reaction time is 18h, and the stirring speed The temperature is 300r / min. After the reaction is completed, the solid-liquid separation of the feed liquid is carried out, and the collected solid product is dried at 80°C for 24h, and the particle size of the obtained precursor is 3800nm.

[0053] c. Use lithium hydroxide as the lithium source, mix with the dried precursor according to the lithiation ratio of 1.0...

Embodiment 2

[0057]The method of Example 1 was used to prepare the ternary positive electrode material, the only difference being that in step b, the pH of the reaction system was controlled to be 10.2, the reaction temperature was 50°C, the reaction time was 14h, the stirring speed was 350r / min, and the collected solid The product was dried at 100° C. for 15 h, and the particle size of the obtained precursor was 1600 nm.

[0058] The test results show that the phase of the prepared sample is Li(Ni 0.8 co 0.1 mn 0.1 )O 2 , the additives used did not affect the sintering process of the ternary cathode material, and the product was still a nickel-cobalt lithium manganate ternary cathode material. The scanning electron microscope results showed that the sample had a hierarchical lamellar structure, and the thickness was 120nm, and the length was 330nm. Assembled by layers, Bi 2 o 3 and V 2 o 5 The introduction of the ternary material maintains the lamellar stacking morphology of the pr...

Embodiment 3

[0060] The method of Example 1 was used to prepare the ternary positive electrode material, the only difference being that in step b, the pH of the reaction system was controlled to be 10.7, the reaction temperature was 55°C, the reaction time was 24h, the stirring speed was 280r / min, and the collected solid The product was dried at 90° C. for 30 h, and the particle size of the obtained precursor was 6200 nm.

[0061] The test results show that the phase of the prepared sample is Li(Ni 0.8 co 0.1 mn 0.1 )O 2 , the additives used did not affect the sintering process of the ternary cathode material, and the product was still a nickel-cobalt lithium manganate ternary cathode material. The scanning electron microscope results showed that the sample had a hierarchical lamellar structure, and the thickness was 180nm, and the length was 540nm. Assembled by layers, Bi 2 o 3 and V 2 o 5 The introduction of the ternary material maintains the lamellar stacking morphology of the pr...

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Abstract

The invention relates to a ternary positive electrode material of a lithium ion battery, a preparation method of the ternary positive electrode material and the lithium ion battery. The particle surface of the ternary positive electrode material is of a lamellar structure, and the lamellar structure is provided with a plurality of stacked lamellar units; the lamella thickness of each lamella unitis 100-200 nm, and the lamella length of each lamella unit is about 300-600 nm; and the D10 of the ternary positive electrode material is 1400-1800nm, the D90 of the ternary positive electrode material is 2900-3300nm, the D50 of the ternary positive electrode material is 2000-2500nm, and the specific surface area of the ternary positive electrode material is 18000-35000 cm<2> / g. Compared with traditional secondary ball small particles, the lithium ion battery positive electrode material disclosed by the invention has better mechanical strength due to closer combination, and the unique graded lamellar structure of the lithium ion battery positive electrode material has a surface richer than that of a single crystal material, so that an electrode / electrolyte interface is increased, the intercalation / deintercalation process of lithium ions is better facilitated, and thus the lithium ion battery positive electrode material has higher capacity.

Description

technical field [0001] The present disclosure relates to the field of lithium-ion batteries, in particular, to a lithium-ion battery ternary cathode material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] With the rapid expansion of the lithium-ion battery market and the advantages of ternary cathode materials in high specific capacity, the demand for ternary cathode materials is increasing day by day. At present, conventional ternary cathode materials have common particle shapes of large single crystal and secondary spherical. Different morphologies have different performance characterization characteristics. According to different usage scenarios of materials, the most suitable ternary cathode materials with specific morphologies can be selected. At present, the production process of ternary cathode materials is mainly high-temperature solid-state method. Most manufacturers in the market now produce large single crystal and seconda...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 范宇琦付强陈靖华曹文玉
Owner HUIZHOU BYD IND
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