High-safety double-doped high-nickel ternary positive electrode material, preparation method thereof and lithium ion battery

A cathode material, double doping technology, applied in the direction of positive electrode, secondary battery, battery electrode, etc., can solve the problem of reducing the advantages of high specific capacity of high nickel ternary cathode materials, restricting the development and application of ternary cathode materials, and increasing processing. Process complexity and other issues, to reduce the probability of abnormal cell accidents, improve the force and bond energy between ions, and improve the high temperature cycle retention rate

Pending Publication Date: 2020-09-11
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The improvement of thermal stability in the existing technology is mostly achieved by sacrificing its specific capacity, or by taking three sinterings and increasing the complexity of the processing process.
These metho

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0068] Example 1:

[0069] The present invention provides a high-safety double-doped high-nickel ternary cathode material and a preparation method thereof. The method includes the following steps:

[0070] ①The lithium hydroxide monohydrate and high nickel ternary cathode precursor Ni 0.83 Co 0.11 Mn 0.06 (OH) 2 , Zirconium oxide and strontium carbonate are uniformly mixed according to Li / Me (molar ratio, Me is the sum of nickel, cobalt and manganese) = 1.04, and the doping ratio of Zr and Sr in the polycrystalline lithium nickel cobalt manganate matrix is ​​2000ppm;

[0071] ②Put the uniformly mixed materials into the atmosphere furnace, set the heating rate to 2°C / min, keep the temperature at 760°C for 10h, the oxygen content in the atmosphere is 97vol%, and then cool with the furnace;

[0072] ③The material obtained by the primary sintering is crushed by roller and ultracentrifugal grinding, and then sieved through a 400 mesh screen;

[0073] ④ Wash the material obtained after sievin...

Example Embodiment

[0080] Example 2:

[0081] The present invention provides a high-safety double-doped high-nickel ternary cathode material and a preparation method thereof. The method includes the following steps:

[0082] ①The lithium hydroxide monohydrate and high nickel ternary cathode precursor Ni 0.83 Co 0.11 Mn 0.06 (OH) 2 , Zirconium oxide and strontium carbonate are uniformly mixed according to Li / Me (molar ratio, Me is the sum of nickel, cobalt and manganese) = 1.04, and the doping ratio of Zr and Sr in the polycrystalline lithium nickel cobalt manganate matrix is ​​2000ppm;

[0083] ②Put the uniformly mixed materials into the atmosphere furnace, set the heating rate to 2°C / min, keep the temperature at 760°C for 10h, and the atmosphere is oxygen atmosphere, and then cool with the furnace;

[0084] ③The material obtained by the primary sintering is crushed by roller and ultracentrifugal grinding, and then sieved through a 400 mesh screen;

[0085] ④ Wash the material obtained after sieving with ...

Example Embodiment

[0090] Example 3:

[0091] The present invention provides a high-safety double-doped high-nickel ternary cathode material and a preparation method thereof. The method includes the following steps:

[0092] ①The lithium hydroxide monohydrate and high nickel ternary cathode precursor Ni 0.83 Co 0.11 Mn 0.06 (OH) 2 , Zirconium oxide and strontium hydroxide are uniformly mixed according to Li / Me (molar ratio, Me is the sum of nickel, cobalt and manganese) = 1.04, and the doping ratio of Zr and Sr in the polycrystalline lithium nickel cobalt manganate matrix is ​​2000 ppm;

[0093] ②Put the uniformly mixed materials into the atmosphere furnace, set the heating rate to 2°C / min, keep the temperature at 760°C for 10h, the oxygen content in the atmosphere is 98vol%, and then cool with the furnace;

[0094] ③The material obtained by the primary sintering is crushed by roller and ultracentrifugal grinding, and then sieved through a 400 mesh screen;

[0095] ④ Wash the material obtained after sievi...

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Abstract

The invention discloses a high-safety double-doped high-nickel ternary positive electrode material, a preparation method thereof and a lithium ion battery. The high-nickel ternary positive electrode material comprises a polycrystalline nickel cobalt lithium manganate matrix, wherein the molar content of Ni element in the polycrystalline nickel cobalt lithium manganate matrix accounts for more than80% of the total molar weight of Ni, Co and Mn, and Zr and Sr elements are doped in the polycrystalline nickel cobalt lithium manganate ternary positive electrode matrix. Compared with the prior art,the high-nickel ternary positive electrode material has the advantage that the thermal stability of the high-nickel ternary positive electrode material is remarkably improved on the premise of not reducing the proportion of the Ni element in the high-nickel ternary positive electrode material, namely, not reducing the specific capacity of the high-nickel ternary positive electrode material. Meanwhile, the price of the nickel element is far lower than that of the cobalt element, so that the nickel element accounts for a high proportion, transition metals such as cobalt account for a low proportion, and the advantage of reducing the cost of raw materials is considered.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, and relates to a high-safety double-doped high-nickel ternary positive electrode material, a preparation method thereof, and a lithium-ion battery. Background technique [0002] As one of the green energy sources in the 21st century, reversible secondary batteries have undergone decades of development from lead-acid batteries to current lithium-ion batteries, and have achieved great results in terms of energy density, cycle life, volume and weight, and environmental protection. The progress of the earth has changed from being only used in 3C digital devices such as mobile phones, laptops, and cameras to the power lithium-ion batteries that can be applied to hybrid electric vehicles or even pure electric vehicles, thus bringing people's lives Great convenience. [0003] Lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and lithium nickel manganese cobalt oxide t...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/44H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028C01P2006/40Y02E60/10
Inventor 楚志颖崔军燕陈修好李嘉俊
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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