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Preparation method of modified nickel cobalt lithium manganate ternary positive electrode material

A technology of nickel-cobalt lithium manganate and cathode material, which is applied in the field of preparation of modified nickel-cobalt lithium manganate ternary cathode material, can solve the problems of harsh synthesis conditions, poor electrochemical performance of materials, and high oxidation potential, and achieve improved Cost-effective, improved electrochemical performance, good cycle performance

Inactive Publication Date: 2021-02-05
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Compared with NCM523 ternary material (LiNi 0.5 co 0.2 mn 0.3 o 2 ), NCM622 ternary material (LiNi 0.6 co 0.2 mn 0.2 o 2 ) Due to the high nickel content and the high oxidation potential of nickel, Ni 2+ to you 3+ oxidation, and due to Li + The ionic radius of Ni 2+ 、Ni 3+ The ionic radii are not much different, so it is easy to cause Li + with you 2+ 、Ni 3+ The ionic shuffling of the Li + The position of Ni 2+ Occupied by NCM622, it increases the cation mixing effect, which easily leads to the deterioration of the electrochemical performance of the material; in the case of contact with water, NCM622 easily causes the dissolution of lithium, resulting in a higher ratio of residual lithium on the surface of the material and a higher pH; therefore The synthesis conditions of NCM622 are harsher than those of NCM523, and the synthesis process is more complicated

Method used

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  • Preparation method of modified nickel cobalt lithium manganate ternary positive electrode material
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  • Preparation method of modified nickel cobalt lithium manganate ternary positive electrode material

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Effect test

Embodiment 1

[0028] Lithium carbonate and 622 nickel-cobalt-manganese ternary precursors are used as reaction raw materials, lithium carbonate and 622 nickel-cobalt-manganese ternary precursors are mixed evenly according to the ratio of molar ratio Li / Me=1.05, put into a muffle furnace for sintering, and Oxygen flow rate is 1m 3 / h, the heating rate is 5°C / min, the sintering temperature is 900°C, and the constant temperature sintering time is 15h, to obtain the nickel-cobalt-lithium-manganese-oxide ternary positive electrode material.

[0029] Mix the nickel-cobalt lithium manganate ternary positive electrode material with metaboric acid evenly, put it into a muffle furnace for secondary sintering, the boron content in the metaboric acid is 0.50wt% of the nickel-cobalt lithium manganate ternary positive electrode material, and feed the oxygen flow 1m 3 / h, the heating rate is 5°C / min, the sintering temperature is 700°C, and the constant temperature sintering time is 6h.

Embodiment 2

[0031] Lithium carbonate and 622 nickel-cobalt-manganese ternary precursors are used as reaction raw materials, lithium carbonate and 622 nickel-cobalt-manganese ternary precursors are mixed evenly according to the ratio of molar ratio Li / Me=1.05, put into a muffle furnace for sintering, and Oxygen flow rate is 1m 3 / h, the heating rate is 5°C / min, the sintering temperature is 900°C, and the constant temperature sintering time is 15h, to obtain the nickel-cobalt-lithium-manganese-oxide ternary positive electrode material.

[0032] Mix the nickel-cobalt lithium manganate ternary positive electrode material with metaboric acid evenly, put it into a muffle furnace for secondary sintering, the boron content in the metaboric acid is 0.50wt% of the nickel-cobalt lithium manganate ternary positive electrode material, and feed the oxygen flow 1m 3 / h, the heating rate is 5°C / min, the sintering temperature is 690°C, and the constant temperature sintering time is 6.5h.

Embodiment 3

[0034] Lithium carbonate and 622 nickel-cobalt-manganese ternary precursors are used as reaction raw materials, lithium carbonate and 622 nickel-cobalt-manganese ternary precursors are mixed evenly according to the ratio of molar ratio Li / Me=1.05, put into a muffle furnace for sintering, and Oxygen flow rate is 1m 3 / h, the heating rate is 5°C / min, the sintering temperature is 900°C, and the constant temperature sintering time is 15h, to obtain the nickel-cobalt-lithium-manganese-oxide ternary positive electrode material.

[0035] Mix nickel-cobalt lithium manganate ternary positive electrode material with metaboric acid evenly, put it into muffle furnace for secondary sintering, the boron content in metaboric acid is 0.10wt% of nickel-cobalt lithium manganate ternary positive electrode material, and feed oxygen flow 1m 3 / h, the heating rate is 3°C / min, the sintering temperature is 700°C, and the constant temperature sintering time is 6h.

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Abstract

The invention discloses a preparation method of a modified lithium nickel cobalt manganate ternary positive electrode material, which comprises the following steps: mixing and sintering the lithium nickel cobalt manganate ternary positive electrode material and metaboric acid at 690-710 DEG C for 5-7 hours to obtain the modified lithium nickel cobalt manganate ternary positive electrode material,wherein the boron content in metaboric acid is 0.10-1.00 wt% of the lithium nickel cobalt manganate ternary positive electrode material. The preparation method provided by the invention can effectively improve the cycle performance of the NCM622 ternary material.

Description

technical field [0001] The invention relates to the technical field of battery positive electrode materials, in particular to a preparation method of a modified nickel-cobalt lithium manganate ternary positive electrode material. Background technique [0002] Due to the advantages of high cost performance, wide source of raw materials, simple process, high safety and environmental protection performance, lithium-ion battery has become one of the power batteries with the best comprehensive performance. [0003] The materials of lithium batteries mainly include positive material, negative material, diaphragm and electrolyte. The key part of the lithium battery is the positive electrode material, and the performance of the positive electrode material has a decisive impact on the performance of the battery. At present, the common cathode materials on the market mainly include: lithium manganese oxide, lithium cobalt oxide, lithium iron phosphate and nickel-cobalt lithium mangan...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 李华成黄冠汉李海亮邓光矿杨茂锋李春霞李春流
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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