High-nickel ternary positive electrode material containing active oxygen removing agent and preparation method thereof

A high-nickel ternary material and cathode material technology, applied in the field of lithium-ion batteries, can solve the problems of serious gas production and impedance increase, and achieve the effects of eliminating residual lithium, easy operation, and reducing surface residual alkali

Pending Publication Date: 2019-07-30
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above technical problems, the present invention discloses a high-nickel ternary positive electrode material containing an active oxygen scavenger and a preparation method thereof, aiming at eliminating the active oxygen formed by the high-nickel ternary material during the phase transition process and avoiding the Oxidation of the electrolyte leads to increased impedance and severe gas production, avoiding the oxidative decomposition of the electrolyte, thereby improving the thermal stability and cycle stability of the material

Method used

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  • High-nickel ternary positive electrode material containing active oxygen removing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of high-nickel ternary cathode material LiNi0.8Co0.1Mn0.1O2, the preparation method of which is similar to Comparative Example 1.

[0026] (2) Dissolve LiNi0.8Co0.1Mn0.1O2 and active oxygen removal agent CoS2 in step (1) in absolute ethanol at a mass ratio of 100:1, ultrasonically disperse for 10 min, and vacuum the sample at 100°C after filtration Dry it for 12 hours, then place it in a muffle furnace for calcination at 700°C for 5 hours in an oxygen-free atmosphere, then cool it to room temperature, and sieve it to obtain CoS2-coated LiNi0.8Co0.1Mn0.1O2 with a mass fraction of 1%.

[0027] (3) The CoS2-coated LiNi0.8Co0.1Mn0.1O2 material prepared in step (2) with a mass fraction of 1% was used as the positive electrode, and the graphite was used as the negative electrode to prepare a pouch battery. The preparation method was similar to Comparative Example 1.

[0028] Test Example 1 Preparation of 1% CoS2-coated high-nickel ternary positive electrode ma...

Embodiment 2

[0030] (1) Preparation of high-nickel ternary cathode material LiNi0.8Co0.1Mn0.1O2, the preparation method of which is similar to Comparative Example 1;

[0031] (2) Dissolve LiNi0.8Co0.1Mn0.1O2 and active oxygen removal agent CoS2 in step (1) in absolute ethanol at a mass ratio of 50:1, ultrasonically disperse for 10 min, and vacuum the sample at 100°C after filtration Dry it for 12 hours, then place it in a muffle furnace for calcination at 700°C for 5 hours in an oxygen-free atmosphere, then cool it to room temperature, and sieve it to obtain CoS2-coated LiNi0.8Co0.1Mn0.1O2 with a mass fraction of 2%.

[0032] (3) The CoS2-coated LiNi0.8Co0.1Mn0.1O2 material prepared in step (2) with a mass fraction of 2% was used as the positive electrode, and the graphite was used as the negative electrode to prepare a pouch battery. The preparation method was similar to Comparative Example 1.

[0033]Test Example 2 prepares the high-nickel ternary positive electrode material containing 2...

Embodiment 3

[0035] (1) Preparation of high-nickel ternary cathode material LiNi0.8Co0.1Mn0.1O2, the preparation method of which is similar to Comparative Example 1;

[0036] (2) Dissolve LiNi0.8Co0.1Mn0.1O2 and active oxygen removal agent CoS2 in step (1) in absolute ethanol at a mass ratio of 20:1, ultrasonically disperse for 10 min, filter and vacuum the sample at 100°C Dry it for 12 hours, then place it in a muffle furnace for calcination at 700°C for 5 hours in an oxygen-free atmosphere, then cool it to room temperature, and sieve it to obtain CoS2-coated LiNi0.8Co0.1Mn0.1O2 with a mass fraction of 5%.

[0037] (3) The CoS2-coated LiNi0.8Co0.1Mn0.1O2 material prepared in step (2) with a mass fraction of 5% was used as the positive electrode, and the graphite was used as the negative electrode to prepare a pouch battery. The preparation method was similar to Comparative Example 1.

[0038] The content of residual lithium on the surface of the high-nickel ternary positive electrode mate...

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Abstract

The invention discloses a high-nickel ternary positive electrode material containing an active oxygen removing agent. The high-nickel ternary positive electrode material containing the active oxygen removing agent comprises the active oxygen removing agent and a high-nickel ternary material. The invention also provides a preparation method of the high-nickel ternary positive electrode material coated with the active oxygen removing agent; and according to the preparation method, the high nickel ternary positive electrode material and the active oxygen removing agent are dissolved in absolute ethanol according to a certain mass ratio for ultrasonic dispersion, and the high-nickel ternary positive electrode material coated with the active oxygen removing agent is obtained by performing vacuum drying on the sample at 100 degrees centigrade for 12 to 24 hours after filtration. The preparation method of the high-nickel ternary positive electrode material coated with the active oxygen removing agent can not only eliminate the active oxygen formed during circulation or storage of the high-nickel ternary positive electrode material, and inhibit the oxidative decomposition and gas production of the electrolyte, but also eliminate the residual lithium on the surface of the high-nickel ternary positive electrode material, reduce the surface residual alkali, and maintain chemical stabilityof the carbonate solvent in the electrolyte; therefore, the cycle performance and stability are improved, and the cycle storage gas production and impedance increase of the battery are effectively inhibited; and the coating process is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-nickel ternary positive electrode material containing an active oxygen removal agent and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the electric vehicle market, people have put forward higher requirements for the battery life and safety performance of lithium-ion batteries. However, the problems of poor thermal stability and easy gas production of high-nickel ternary cathode materials still cannot be effectively improved. [0003] It is well known that during cycling or storage, especially in the state of high delithiation, an irreversible phase transition reaction will occur on the surface of high-nickel ternary cathode materials, from layered structure to spinel structure to rock-salt structure, accompanied by active oxygen release. The oxidation activity of active oxygen is very strong, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/42H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/4235H01M10/0525Y02E60/10
Inventor 刘甜甜李强鲁俊文
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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