Magnesium ion doped gradient nickel cobalt lithium manganate anode material and preparation method thereof

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, applied in the field of magnesium ion-doped gradient nickel-cobalt lithium manganese oxide positive electrode materials and its preparation, can solve the problem of fast capacity decay, low capacity, and inability to meet the needs of lithium-ion battery capacity problem, to achieve the effect of high charge and discharge reaction and reversible charge and discharge reaction

Active Publication Date: 2019-04-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the increase of people's demand for portable devices and the development of commercial lithium-ion batteries, the current mainstream NCM523 and NCM622 can no longer meet people's demand for lithium-ion battery capacity.
Although the high-nickel NCM811 can meet the energy density required by electric vehicles, its cycle performance is unstable and its capacity decays quickly, making it difficult to achieve large-scale commercial applications.
[0003] CN104201366A discloses a method for preparing a high-safety and high-compacted-density lithium nickel-cobalt-manganese oxide NCM523 ternary material. During the sintering process of the material, an appropriate amount of magnesium compound is added for doping to increase the ternary material of nic

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  • Magnesium ion doped gradient nickel cobalt lithium manganate anode material and preparation method thereof
  • Magnesium ion doped gradient nickel cobalt lithium manganate anode material and preparation method thereof
  • Magnesium ion doped gradient nickel cobalt lithium manganate anode material and preparation method thereof

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Effect test

Embodiment 1

[0062] The chemical formula of the magnesium ion-doped gradient nickel-cobalt lithium manganate positive electrode material is LiNi 0.84 co 0.09 mn 0.05 Mg 0.02 o 2 The nickel content gradually decreases from the center to the surface of the positive electrode material particle, the manganese content gradually increases from the center to the surface of the positive electrode material particle, and the content of cobalt and magnesium is uniformly distributed in the positive electrode material; the magnesium ion The doped graded nickel-cobalt lithium manganate cathode material is spherical particles with an average particle diameter of 7.5 μm.

[0063] Such as figure 1 As shown, the magnesium ion-doped gradient nickel-cobalt lithium manganese oxide positive electrode material in the embodiment of the present invention is a polycrystalline aggregate containing nickel, cobalt, manganese, and magnesium without other impurities.

[0064] Such as figure 2 As shown, the second...

Embodiment 2

[0074] The chemical formula of the magnesium ion-doped gradient nickel-cobalt lithium manganate positive electrode material is LiNi 0.67 co 0.12 mn 0.16 Mg 0.05 o 2 The nickel content gradually decreases from the center to the surface of the positive electrode material particle, the manganese content gradually increases from the center to the surface of the positive electrode material particle, and the content of cobalt and magnesium is uniformly distributed in the positive electrode material; the magnesium ion The doped graded nickel-cobalt lithium manganate cathode material is spherical particles with an average particle diameter of 10.2 μm.

[0075] After testing, the magnesium ion-doped gradient nickel-cobalt lithium manganese oxide positive electrode material in the embodiment of the present invention is a polycrystalline aggregate containing nickel, cobalt, manganese, and magnesium without other impurities.

[0076] like Figure 7 As shown, the secondary particle si...

Embodiment 3

[0086] The chemical formula of the magnesium ion-doped gradient nickel-cobalt lithium manganate positive electrode material is LiNi 0.78 co 0.06 mn 0.06 Mg 0.1 o 2 The nickel content gradually decreases from the center to the surface of the positive electrode material particle, the manganese content gradually increases from the center to the surface of the positive electrode material particle, and the content of cobalt and magnesium is uniformly distributed in the positive electrode material; the magnesium ion The doped graded nickel-cobalt lithium manganate cathode material is a spherical particle with an average particle diameter of 6 μm.

[0087] After testing, the magnesium ion-doped gradient nickel-cobalt lithium manganese oxide positive electrode material in the embodiment of the present invention is a polycrystalline aggregate containing nickel, cobalt, manganese, and magnesium without other impurities.

[0088] After testing, the secondary particle size distributio...

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Abstract

The invention relates to a magnesium ion doped gradient nickel cobalt lithium manganate anode material and a preparation method thereof. The chemical formula of the anode material is LiNixCoyMnzMg (1-x-y-z) O2, wherein x is more than 0.5 and less than 0.9, y is more than 0.05 and less than 0.20, z is more than 0.05 and less than 0.30, and 1-x-y-z is more than 0; the nickel content is gradually reduced from the center to the surface of the anode material particles, the manganese content is gradually increased from the center to the surface of the anode material particles, and the contents of cobalt and magnesium are uniformly distributed in the anode material. The invention also discloses a preparation method of the anode material. The anode material has the advantages that the structure and the cycle performance are stable in the charging and discharging process, the capacity is higher, and the charging and discharging reaction is highly reversible. The method has the advantages of simple process, low reaction temperature and low raw material cost, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a nickel-cobalt lithium manganese oxide cathode material and a preparation method thereof, in particular to a magnesium ion-doped gradient nickel-cobalt lithium manganese oxide cathode material and a preparation method thereof. Background technique [0002] With the increase of people's demand for portable devices and the development of commercial lithium-ion batteries, the current mainstream NCM523 and NCM622 can no longer meet people's demand for lithium-ion battery capacity. Although the high-nickel NCM811 can meet the energy density required by electric vehicles, its cycle performance is unstable and its capacity decays quickly, making it difficult to achieve large-scale commercial applications. [0003] CN104201366A discloses a method for preparing a high-safety and high-compacted-density lithium nickel-cobalt-manganese oxide NCM523 ternary material. During the sintering process of the material, an appropriate amount of ma...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 童汇姚赢赢黄英德王旭周其杰喻万景郑俊超
Owner CENT SOUTH UNIV
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