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Monocrystal ternary positive electrode material, preparation method thereof and lithium ion battery

A positive electrode material and a ternary material technology are applied in the field of a single crystal ternary positive electrode material and a preparation method thereof, as well as in the field of lithium ion batteries, which can solve the problems of consuming water resources, not complying with energy conservation and environmental protection, etc., and achieve low preparation cost and energy saving. , the effect of short roasting time

Active Publication Date: 2021-09-28
贵州丕丕丕电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method consumes a lot of water resources when removing the flux, and the single crystal ternary material can only be obtained through multiple roasting, which does not meet the requirements of energy saving and environmental protection

Method used

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  • Monocrystal ternary positive electrode material, preparation method thereof and lithium ion battery
  • Monocrystal ternary positive electrode material, preparation method thereof and lithium ion battery
  • Monocrystal ternary positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0022] The invention provides a method for preparing a single crystal ternary positive electrode material, comprising the following steps:

[0023] A) extruding after mixing the ternary material precursor, lithium source and additives to obtain a green body;

[0024] The additive is selected from one or more of metal powder and carbon powder, and the metal powder is selected from one or more of metal cobalt powder, metal manganese powder and metal nickel powder;

[0025] B) igniting the bottom of the green body with arc discharge to carry out self-propagating high-temperature combustion synthesis, and obtaining an intermediate after cooling;

[0026] C) crushing, shaping, grading, roasting and cooling the intermediate in sequence to obtain a single crystal ternary positive electrode material.

[0027] In the invention, the precursor of the ternary material, the lithium source and the additive are uniformly mixed at first, and then put into a mold for extrusion to obtain a gre...

Embodiment 1

[0042] A) Weigh lithium hydroxide and Ni according to the molar ratio of 1.04:1:0.01:0.01 0.5 co 0.3 mn 0.2 (OH) 2 , metal Mn powder and carbon black, mixed evenly, put into a mold and extrude into a billet.

[0043]B) Then put the compacted green body into the reaction furnace, use arc discharge to ignite the green body for self-propagating high-temperature combustion synthesis, and obtain an intermediate after cooling; the discharge voltage of arc discharge is 24V, and the discharge time is 15s.

[0044] C) Crushing, shaping, roasting and cooling the intermediate to obtain single crystal LiNi 0.5 co 0.3 mn 0.2 o 2 Ternary cathode material; the calcination temperature is 600° C., and the calcination time is 8 hours.

[0045] see Figure 1~2 , figure 1 It is an electronic scanning photo of the intermediate of Example 1. Depend on figure 1 It can be seen that after the self-propagating reaction, a high-density nickel-cobalt-manganese ternary cathode material intermed...

Embodiment 2

[0047] A) Weigh lithium hydroxide and Ni according to the molar ratio of 1.02:1:0.01:0.02 0.5 co 0.2 mn 0.3 (OH) 2 , metal Ni powder and carbon black, mix them evenly, put them into a mold and extrude them into a green body.

[0048] B) Then put the compacted green body into the reaction furnace, use arc discharge to ignite the green body for self-propagating high-temperature combustion synthesis, and obtain an intermediate after cooling; the discharge voltage of arc discharge is 36V, and the discharge time is 8s.

[0049] C) Crushing, shaping, roasting and cooling the intermediate to obtain single crystal LiNi 0.5 co 0.2 mn 0.3 o 2 Ternary cathode material; the calcination temperature is 650° C., and the calcination time is 6 hours.

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Abstract

The invention provides a preparation method of a single-crystal ternary positive electrode material, which comprises the following steps: A) mixing a ternary material precursor, a lithium source and an additive, and conducting extruding to obtain a green body, wherein the additive is selected from one or more of metal powder and carbon powder, and the metal powder is selected from one or more of metal cobalt powder, metal manganese powder and metal nickel powder; b) igniting the bottom of the green body by arc discharge to carry out self-propagating high-temperature combustion synthesis, and conducting cooling to obtain an intermediate; and C) sequentially crushing, shaping, grading, roasting and cooling the intermediate to obtain the single-crystal ternary positive electrode material. The preparation method of the single crystal ternary material is simple in process, low in preparation cost and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a single crystal ternary positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] The currently commercialized cathode materials for lithium-ion batteries include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and nickel-cobalt-manganese ternary cathode materials. Compared with other cathode materials, nickel-cobalt-manganese ternary cathode materials have higher discharge specific capacity, higher cycle performance and rate performance, and are especially suitable as cathode materials for high energy density lithium-ion batteries. Ordinary ternary materials have a polycrystalline spherical shape, which is easily broken into multiple fine particles during the compaction process of the pole piece, resulting in increased side reactions during the charging and discharging pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B1/10C30B29/22H01M4/505H01M4/525H01M10/0525
CPCC30B1/10C30B29/22H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 同格拉格刘丕录吴江
Owner 贵州丕丕丕电子科技有限公司
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