Calcium phosphate coated high-nickel ternary positive electrode material as well as preparation method and application thereof

A positive electrode material, calcium phosphate technology, applied in the field of electrochemistry, can solve the problems of poor cycle stability of high-nickel ternary positive electrode materials, achieve good cycle stability, simple preparation method, and improve storage performance

Active Publication Date: 2022-05-31
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a calcium phosphate-coated high-nickel ternary positive electrode material and its preparation method and application to solve the problem of poor cycle stability of existing high-nickel ternary positive electrode materials

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  • Calcium phosphate coated high-nickel ternary positive electrode material as well as preparation method and application thereof
  • Calcium phosphate coated high-nickel ternary positive electrode material as well as preparation method and application thereof
  • Calcium phosphate coated high-nickel ternary positive electrode material as well as preparation method and application thereof

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preparation example Construction

[0036] Based on the above strategy, an embodiment of the present invention provides a method for preparing a calcium phosphate-coated high-nickel ternary cathode material, including the following steps:

[0037] S1, prepare calcium source solution and phosphorus source solution;

[0038] S2. Add calcium source solution into organic solvent or water, stir evenly, then add high-nickel ternary cathode material and phosphorus source solution, heat and dry to obtain powder;

[0039] S3. Calcining the powder to obtain a calcium phosphate-coated high-nickel ternary positive electrode material.

[0040] Thus, the present invention forms a passivation layer on the surface after coating calcium phosphate on the high-nickel ternary positive electrode material through calcination. Since calcium phosphate has excellent thermal stability and excellent chemical stability, its Coating on the high-nickel ternary surface can effectively reduce the residual lithium on the surface of the high-ni...

Embodiment 1

[0056] This embodiment provides a method for preparing a calcium phosphate-coated high-nickel ternary positive electrode material, comprising the following steps:

[0057] 1) Weigh 2.28407g (0.009672115mol) of calcium nitrate tetrahydrate (relative molecular weight 236.15), dissolve it in ethanol, pour it into a 100ml volumetric flask, add ethanol to constant volume, and weigh 0.741722g (0.00644807mol) of ammonium dihydrogen phosphate (relative molecular mass 115.03), dissolved in ultrapure water, poured into a 100ml volumetric flask, and added water to volume.

[0058] According to the coating amount of calcium phosphate is 0.5wt%, carry out batching, calcium-phosphorus ratio 3:2 (0.5 milliliter calcium nitrate adds 0.5 milliliter ammonium dihydrogen phosphate mixes, obtains 0.5wt% calcium phosphate coating required on the high-nickel material The proportioning ratio, that is, mixing 0.5ml each of two different solutions is 0.5wt% coating amount. When 1ml each of the two diff...

Embodiment 2

[0062] This embodiment provides a method for preparing a calcium phosphate-coated high-nickel ternary positive electrode material, comprising the following steps:

[0063] 1) Weigh 2.28407g (0.009672115mol) of calcium nitrate tetrahydrate (relative molecular weight 236.15), dissolve it in ethanol, pour it into a 100ml volumetric flask, add ethanol to constant volume, and weigh 0.741722g (0.00644807mol) of ammonium dihydrogen phosphate (relative molecular mass 115.03), dissolved in ultrapure water, poured into a 100ml volumetric flask, and added water to volume.

[0064] According to the coating amount of calcium phosphate is 1wt%, the compounding is carried out, and the ratio of calcium and phosphorus is 3:2.

[0065] 2) Add 1ml of calcium nitrate solution into 100ml of ethanol, stir evenly, take 1g of high-nickel ternary material, add 1ml of ammonium dihydrogen phosphate solution, stir slowly, heat and stir at 80°C for 50min, stir and evaporate to dryness to obtain powder; ...

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Abstract

The invention provides a calcium phosphate coated high-nickel ternary positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a calcium source solution and a phosphorus source solution; adding the calcium source solution into an organic solvent or water, uniformly stirring, then adding a high-nickel ternary positive electrode material and the phosphorus source solution, and heating and drying to obtain powder; and calcining the powder to obtain the calcium phosphate coated high-nickel ternary positive electrode material. The high-nickel ternary positive electrode material is firstly coated with calcium phosphate and then sintered, so that residual lithium on the surface of the high-nickel ternary positive electrode material can be effectively reduced, side reaction between the residual lithium and electrolyte is reduced, and the storage performance of the high-nickel ternary positive electrode material is improved.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a calcium phosphate-coated high-nickel ternary positive electrode material and a preparation method and application thereof. Background technique [0002] With the rapid development of human society and its urgent and important demand for clean energy, lithium-ion batteries, as an efficient electrochemical energy storage device, have shown great potential in the fields of smart electronic devices, pure electric vehicles, and large-scale energy storage systems. application prospects and huge economic benefits. In the past two decades, lithium-ion batteries have made great progress, but compared with traditional fuel vehicles, pure electric vehicles based on lithium-ion power batteries still need to further improve their cruising range in order to eliminate people's anxiety about the range of pure electric vehicles. At present, increasing the specific capacity of the batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/525H01M10/0525
CPCH01M4/628H01M4/366H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 麦立强朱河圳王选朋韩康杨晨
Owner WUHAN UNIV OF TECH
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