Preparation method of zirconium-doped cerium fluoride coated nickel-cobalt-manganese ternary positive electrode material and prepared positive electrode material

A nickel-cobalt-manganese ternary, positive electrode material technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor capacity and cycle performance of positive electrode materials, achieve good electrochemical inertness, good stability, and shorten the diffusion path Effect

Pending Publication Date: 2022-03-01
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the positive electrode materials coated with fluoride in the prior art still have poor capacity and cycle performance

Method used

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  • Preparation method of zirconium-doped cerium fluoride coated nickel-cobalt-manganese ternary positive electrode material and prepared positive electrode material
  • Preparation method of zirconium-doped cerium fluoride coated nickel-cobalt-manganese ternary positive electrode material and prepared positive electrode material
  • Preparation method of zirconium-doped cerium fluoride coated nickel-cobalt-manganese ternary positive electrode material and prepared positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for preparing a zirconium-doped cerium fluoride-coated nickel-cobalt-manganese ternary positive electrode material, specifically comprising the following steps:

[0037] (1) 100g of nickel-cobalt-manganese hydroxide precursor powder, 47.94g of lithium hydroxide powder (the lithiation ratio is 1.05) and 0.2026g of zirconia were ball milled for 2 hours at a ball mill speed of 300r / min, and then In a tube furnace, heat up to 480°C at a heating rate of 2°C / min and hold for 5 hours (the first step of sintering), then raise the temperature at a rate of 2°C / min to 800°C and hold for 15 hours (second step of sintering); After cooling, it is ground and sieved to obtain nickel-cobalt-manganese lithium oxide powder, which is the zirconium-doped nickel-cobalt-manganese ternary positive electrode material. In this embodiment, the material ratio of nickel:cobalt:manganese in the nickel-cobalt-manganese hydroxide precursor is 8:1:1.

[0038] (2) Weigh cerium nitrate and put ...

Embodiment 2

[0042] The difference between this example and Example 1 is that the total mass of cerium fluoride in step (2) is 1% of the weight of the nickel-cobalt-manganese-lithium oxide powder, so that zirconium-doped cerium fluoride-coated nickel-cobalt is obtained. Manganese ternary cathode material 2. The positive electrode of the battery was fabricated and tested in the same steps as in Example 1. The electrochemical properties of the product are shown in Table 1.

Embodiment 3

[0044] The difference between this example and Example 1 is that the total mass of cerium fluoride in step (2) is 2% of the weight of the nickel-cobalt-manganese-lithium oxide powder, so that zirconium-doped cerium fluoride-coated nickel-cobalt is obtained. Manganese ternary cathode material3. The positive electrode of the battery was fabricated and tested in the same steps as in Example 1. The electrochemical properties of the product are shown in Table 1.

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Abstract

The invention discloses a preparation method of a zirconium-doped cerium fluoride-coated nickel-cobalt-manganese ternary positive electrode material, and relates to the technical field of lithium ion positive electrode materials, and the preparation method comprises the following steps: (1) ball-milling and mixing a nickel-cobalt-manganese hydroxide precursor, a lithium source and a zirconium source, and sintering to obtain the zirconium-doped nickel-cobalt-manganese ternary positive electrode material; and (2) mixing a cerium salt solution with the zirconium-doped nickel-cobalt-manganese ternary positive electrode material in the step (1), stirring, adding an ammonium fluoride solution, reacting, drying, and calcining to obtain the zirconium-doped cerium fluoride-coated nickel-cobalt-manganese ternary positive electrode material. The preparation method has the beneficial effects that the residual alkali on the surface of the prepared ternary positive electrode material is reduced, and the ternary positive electrode material has high specific discharge capacity and cycle performance and high capacity retention ratio.

Description

technical field [0001] The invention relates to the technical field of lithium-ion positive electrode materials, in particular to a preparation method of a zirconium-doped cerium fluoride-coated nickel-cobalt-manganese ternary positive electrode material and the prepared positive electrode material. Background technique [0002] Lithium-ion batteries (LIBs) are considered to be the most promising chemical power sources due to their advantages such as high voltage, high specific capacity, long cycle life, small self-discharge, small size, and less environmental pollution, and have always been a research hotspot and focus. Lithium-ion batteries are not only widely used in portable electronic products such as mobile phones, but also have broad application prospects in the field of electric vehicles. In the process of rapid development of lithium-ion batteries, the cathode material is the bottleneck that restricts its large-scale promotion, application and even market occupation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/38
CPCH01M4/505H01M4/525H01M4/38Y02E60/10
Inventor 刘星
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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