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Modified single crystal ternary cathode material based on zirconium nitrogen co-doped carbon dots and preparation method thereof

A technology for positive electrode materials and single crystal materials, which is applied in the field of modified single crystal ternary positive electrode materials based on zirconium nitrogen co-doped carbon dots and its preparation, can solve the effects of metal valence and lattice structure of positive electrode materials, carbon point agglomeration package Uneven coating, insufficient washing and coating process, etc., to achieve excellent cycle performance and discharge capacity, excellent electrical conductivity and chemical stability, and improve cycle stability

Active Publication Date: 2022-07-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of high residual alkali content on the surface of the ternary cathode material in the existing mass production process, uneven carbon dot agglomeration coating, ordinary carbon coating has a certain influence on the metal valence state and lattice structure of the cathode material, and water washing package Insufficient coating process and other problems, the present invention provides a modified single crystal ternary positive electrode material based on zirconium nitrogen co-doped carbon dots and its preparation method

Method used

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  • Modified single crystal ternary cathode material based on zirconium nitrogen co-doped carbon dots and preparation method thereof
  • Modified single crystal ternary cathode material based on zirconium nitrogen co-doped carbon dots and preparation method thereof
  • Modified single crystal ternary cathode material based on zirconium nitrogen co-doped carbon dots and preparation method thereof

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Embodiment 1

[0048] This embodiment prepares a ternary single crystal positive electrode material coated with zirconium-nitrogen co-doped carbon dots, including the following steps:

[0049] 1) Precursor Ni of ternary single crystal cathode material 0.72 Co 0.08 Mn 0.2 (OH) 2 It was mixed with lithium hydroxide at a high speed of 1:1.05 for 15 minutes, then placed in a muffle furnace, heated to 600 °C at a heating rate of 20 °C / min in an oxygen atmosphere, held for 2 hours, then heated to 860 °C, held for 12 hours , naturally cooled to below 80 °C, and the primary sintered single crystal cathode material LiNi was prepared. 0.72 Co 0.08 Mn 0.2 O 2 .

[0050] 2) 12 parts by weight of LiNi, a single-crystal positive electrode material, was sintered once 0.72 Co 0.08 Mn 0.2 O 2 Dissolve 1 part by weight of white and sugar in 7.3 parts by weight of deionized water, stir mechanically evenly, place it in a flash dryer at 110°C, dry it for 8 hours, place it in a nitrogen atmosphere and ...

Embodiment 2

[0055] This embodiment prepares a ternary single crystal positive electrode material coated with zirconium-nitrogen co-doped carbon dots, including the following steps:

[0056] 1) Precursor Ni of ternary single crystal cathode material 0.8 Co 0.1 Mn 0.1 (OH) 2 Mixed with lithium hydroxide at a high speed of 1:1.05 for 15 minutes, placed in a muffle furnace, heated to 600 °C at a heating rate of 20 °C / min in an oxygen atmosphere, held for 2 hours, then heated to 840 °C, held for 12 hours, Naturally cooled to below 80°C to prepare primary sintered single crystal cathode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 .

[0057] 2) 10 parts by weight of LiNi, a single-crystal positive electrode material, was sintered once 0.8 Co 0.1 Mn 0.1 O 2 Dissolve 1 part by weight of celery sugar in 6.2 parts by weight of deionized water, stir mechanically evenly, place it in a flash dryer at 110°C, dry it for 8 hours, place it in an argon atmosphere and heat it up to 240°C at a heating rate...

Embodiment 3

[0062] This embodiment prepares a ternary single crystal positive electrode material coated with zirconium-nitrogen co-doped carbon dots, including the following steps:

[0063] 1) Precursor Ni of ternary single crystal cathode material 0.65 Co 0.1 Mn 0.25 (OH) 2 It was mixed with lithium carbonate at a high speed of 1:1.07 for 15 minutes, placed in a muffle furnace, heated to 700°C at a heating rate of 20°C / min in a dry air atmosphere, held for 2 hours, then heated to 900°C, held for 12 hours, Naturally cooled to below 80°C to prepare primary sintered single crystal cathode material LiNi 0.65 Co 0.1 Mn 0.25 O 2 .

[0064] 2) 14 parts by weight of LiNi, a single-crystal positive electrode material, was sintered once 0.65 Co 0.1 Mn 0.25 O 2 Dissolve 1 part by weight of rhamnose in 8.4 parts by weight of deionized water, stir mechanically evenly, place it in a flash dryer at 110°C, dry it for 8 hours, place it in a nitrogen atmosphere and heat it up to 240°C at a heat...

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Abstract

The invention discloses a modified single crystal ternary positive electrode material based on zirconium nitrogen co-doped carbon dots and a preparation method thereof. The preparation method includes the following steps: mixing a ternary single crystal positive electrode material precursor and a lithium source, heating and sintering to obtain a primary sintering ternary single crystal material; the primary sintering ternary single crystal material is mixed with a natural organic carbon source and then heated up Firing to obtain a carbon dot-coated ternary single crystal positive electrode material; dissolving zirconium oxysulfate and the carbon dot-coated ternary single crystal positive electrode material in water, adding sulfuric acid for reaction, and separating out a solid after the reaction is completed, After washing and drying, a ternary single crystal positive electrode material coated with modified carbon dots is prepared; the ternary single crystal positive electrode material coated with modified carbon dots is mixed with isophorone diisocyanate and then spin-coated on a titanium base On-chip, heating and firing to obtain the ternary single crystal positive electrode material coated with the zirconium-nitrogen co-doped carbon dots.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a modified single crystal ternary positive electrode material based on zirconium nitrogen co-doped carbon dots and a preparation method thereof. Background technique [0002] At this stage, with the continuous improvement of the mileage of passenger cars, ternary layered materials have become a hot research topic as cathode materials for lithium-ion batteries. In addition, as cobalt prices continue to rise, the direction of higher nickel has become the mainstream direction. Although the high-nickel ternary cathode material can bring higher battery capacity, the lower sintering temperature causes a large amount of free lithium on the surface of the material, which is easy to interact with H in the environment. 2 O reaction to generate LiOH and Li on the surface of the material 2 CO 3 , resulting in an excessively high content of re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525C30B1/10C30B29/22C30B33/10
CPCH01M4/505H01M4/525H01M4/625H01M10/0525C30B1/10C30B33/10C30B29/22H01M2004/028Y02E60/10
Inventor 高明昊魏博丁楚雄
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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