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Gradient sodium ion doped nickel cobalt lithium aluminate positive electrode material, preparation method and lithium battery

A technology of nickel-cobalt-lithium-aluminate and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as capacity decline, and achieve the effect of improving layered structure, simple and efficient doping process, and improving crystallinity

Inactive Publication Date: 2018-10-09
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, the doping of sodium ions usually leads to a partial decrease in capacity

Method used

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  • Gradient sodium ion doped nickel cobalt lithium aluminate positive electrode material, preparation method and lithium battery
  • Gradient sodium ion doped nickel cobalt lithium aluminate positive electrode material, preparation method and lithium battery
  • Gradient sodium ion doped nickel cobalt lithium aluminate positive electrode material, preparation method and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Gradient Na + The preparation of doped nickel cobalt lithium aluminate, concrete steps are as follows:

[0034] Weigh 4.5571 grams of precursor Ni 0.8 co 0.15 Al 0.05 (OH) 2 , 1.9396 g Li 2 CO 3 (Excessive Li to make up for lithium loss during high-temperature calcination) and 0.048 g of NaCl, after mixing the three thoroughly, the temperature of the material was raised to 450 °C at a rate of 3 °C / min in an oxygen atmosphere in a tube furnace C for 6 hours, then raised the temperature to 850°C for 12 hours at a heating rate of 3°C / min, and finally cooled to room temperature to obtain a gradient Na + doped LiNi 0.8 co 0.15 Al 0.05 o 2 .

[0035] The prepared positive electrode material is used to make the electrode sheet and assemble the battery. The process is as follows:

[0036] (1) Production of electrode sheets

[0037] The positive electrode material prepared in Example 1 was uniformly mixed with the conductive agent and the binder according to the mas...

Embodiment 2

[0058] Gradient Na + The preparation of doped nickel cobalt lithium aluminate, concrete steps are as follows:

[0059] Weigh 4.5571 grams of precursor Ni 0.8 co 0.15 Al 0.05 (OH) 2 , 1.85 g Li 2 CO 3 and 0.065 gram of NaCl, after the three are fully mixed, the material is pre-fired at 450 °C for 6 hours under an oxygen atmosphere in a tube furnace with a heating rate of 3 °C / min, and then heated at 3 °C The heating rate of / min raised the temperature to 800 ° C for 12 hours, and finally cooled to room temperature to obtain the gradient Na + doped LiNi 0.8 co 0.15 Al 0.05 o 2 .

[0060] The prepared positive electrode material was used to make electrode sheets and assemble batteries, the steps were the same as in Example 1.

Embodiment 3

[0062] Gradient Na + The preparation of doped nickel cobalt lithium aluminate, concrete steps are as follows:

[0063] Weigh 4.5571 grams of precursor Ni 0.8 co 0.15 Al 0.05 (OH)2 , 2.035 g Li 2 CO 3 and 0.204 gram of NaCl, after the three are fully mixed, the material is pre-fired at 450 °C for 6 hours at a rate of 3 °C / min in an oxygen atmosphere in a tube furnace, and then heated at 3 °C The heating rate of / min raised the temperature to 850 ° C for 10 hours, and finally cooled to room temperature to obtain the gradient Na + doped LiNi 0.8 co 0.15 al 0.05 o 2 .

[0064] The prepared positive electrode material was used to make electrode sheets and assemble batteries, the steps were the same as in Example 1.

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Abstract

The invention relates to a gradient sodium ion doped nickel cobalt lithium aluminate positive electrode material, a preparation method and a lithium battery. The nickel cobalt lithium aluminate positive electrode material is doped with sodium ions, and the sodium ion concentration gradually decreases from the surface to the inside of the positive electrode material. The preparation method comprises the following steps: weighing precursors Ni0.8Co0.15Al0.05(OH)2 and Li2CO3 according to a molar ratio of 1 to 0.5-0.55, adding NaCl with the mass fraction of 0.7-3wt%, thoroughly mixing the three uniformly, then raising the temperature of a material to 450 DEG C at a temperature raising rate of 3 DEG C / min in an oxygen atmosphere in a tubular furnace, pre-sintering for 6 hours, then raising thetemperature to 800-850 DEG C at a temperature raising rate of 3 DEG C / min, calcinating for 10-12 hours, and finally cooling to a room temperature to obtain the gradient Na<+> doped LiNi0.8Co0.15Al0.05O2. Through gradient doping, the structural stability of the material can be improved and relatively high capacity can be maintained, and further a high-nickel ternary positive electrode material withrelatively good cyclic stability is obtained.

Description

technical field [0001] The invention relates to the technical field of high-nickel lithium-ion batteries, in particular to an ion-doped nickel-cobalt-lithium-aluminate cathode material capable of improving cycle performance and a preparation method thereof. Background technique [0002] With the vigorous development of the global electric vehicle market, energy storage devices with high energy density have become the main factor limiting the commercialization of electric vehicles. Lithium-ion batteries have attracted widespread attention in the market due to their high energy density and operating voltage. Among them, high-nickel ternary cathode materials are considered to be the next-generation cathode materials for lithium-ion power batteries with great application prospects. High-nickel cathode materials have the advantages of high specific capacity, good rate performance and low cost. However, this material has poor structural stability during cycling, especially at a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525
CPCH01M4/362H01M4/485H01M4/525H01M10/0525Y02E60/10
Inventor 高学平王杨阳李国然刘胜
Owner NANKAI UNIV
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