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Preparation method of in-situ coated single-crystal high-nickel ternary positive electrode material

A cathode material and in-situ coating technology, which is applied in the field of preparation of single-crystal high-nickel ternary cathode materials that are sintered at low temperature and achieve in-situ coating, can solve problems such as lithium loss, reduction of electrochemical performance of cathode materials, and mixed arrangement. , to achieve the effect of controlling particle size

Pending Publication Date: 2022-04-15
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high-temperature sintering is likely to cause lithium loss, the formation of NiO rock salt phase and Li / Ni mixing, which will reduce the electrochemical performance of cathode materials.

Method used

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  • Preparation method of in-situ coated single-crystal high-nickel ternary positive electrode material
  • Preparation method of in-situ coated single-crystal high-nickel ternary positive electrode material
  • Preparation method of in-situ coated single-crystal high-nickel ternary positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Ni 0.8 co 0.1 mn 0.1 (OH) 2 Grinding with lithium oxalate in a molar ratio of 1:1.08 to obtain mixed powder a;

[0039] (2) Mix powder b of vanadium oxide and molybdenum oxide with mixed powder a, grind and mix uniformly to obtain mixed powder c, wherein the mass fraction of mixed powder b in mixed powder c is 4%; Vanadium oxide and molybdenum oxide are mixed according to the molar ratio of metal ion vanadium and metal ion molybdenum of 1:1;

[0040] (3) Then put the mixed powder c in a microwave sintering furnace, raise the temperature up to 160°C at a rate of 5°C / min and keep it for 2 hours under the condition of oxygen flow, and then raise it to 450°C at a rate of 5°C / min and hold it for 5 hours , and then raised to 880°C at a rate of 1°C / min and held for 16 hours, and cooled with the furnace to obtain a solid block material;

[0041] (4) After crushing and grinding the solid block material, mix it with deionized water at a mass ratio of 1:10, ultrasonically...

Embodiment 2

[0045] (1) Ni 0.8 co 0.1 mn 0.1 (OH) 2 Grinding with lithium oxalate in a molar ratio of 1:1.08 to obtain mixed powder a;

[0046] (2) Mix powder b of vanadium oxide and molybdenum oxide with mixed powder a, grind and mix uniformly to obtain mixed powder c, wherein the mass fraction of mixed powder b in mixed powder c is 6%; Vanadium oxide and molybdenum oxide are mixed according to the molar ratio of metal ion vanadium and metal ion molybdenum of 1:1;

[0047] (3) Then put the mixed powder c in a microwave sintering furnace, raise the temperature up to 160°C at a rate of 5°C / min and keep it for 2 hours under the condition of oxygen flow, and then raise it to 450°C at a rate of 5°C / min and hold it for 5 hours , and then raised to 880°C at a rate of 1°C / min and held for 16 hours, and cooled with the furnace to obtain a solid block material;

[0048] (4) After crushing and grinding the solid block material, mix it with deionized water at a mass ratio of 1:10, ultrasonically...

Embodiment 3

[0052] (1) Ni 0.8 co 0.1 mn 0.1 (OH) 2 Grinding with lithium oxalate in a molar ratio of 1:1.08 to obtain mixed powder a;

[0053] (2) Mix powder b of vanadium oxide and molybdenum oxide with mixed powder a, grind and mix uniformly to obtain mixed powder c, wherein the mass fraction of mixed powder b in mixed powder c is 8%; Vanadium oxide and molybdenum oxide are mixed according to the molar ratio of metal ion vanadium and metal ion molybdenum of 1:1;

[0054] (3) Then put the mixed powder c in a microwave sintering furnace, raise the temperature up to 160°C at a rate of 5°C / min and keep it for 2 hours under the condition of oxygen flow, and then raise it to 450°C at a rate of 5°C / min and hold it for 5 hours , and then raised to 880°C at a rate of 1°C / min and held for 16 hours, and cooled with the furnace to obtain a solid block material;

[0055] (4) After crushing and grinding the solid block material, mix it with deionized water at a mass ratio of 1:10, ultrasonically...

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Abstract

The invention belongs to the technical field of lithium ion battery positive electrode materials, and particularly relates to a preparation method of a single-crystal high-nickel ternary positive electrode material for low-temperature sintering and in-situ coating. The preparation method comprises the following steps: mixing Ni0. 8Co0. 1Mn0. 1 (OH) 2 with a lithium source according to a certain proportion, simultaneously mixing a fluxing agent containing molybdenum and a fluxing agent containing vanadium, and calcining by using a microwave sintering furnace at a certain temperature to prepare the single crystal LiNi0. 8Co0. 1Mn0. 1 O2 material with in-situ coating layer lithium molybdenum vanadate. The direct contact between the electrolyte and the surfaces of the single-crystal LiNi < 0.8 > Co < 0.1 > Mn < 0.1 > O < 2 > particles can be prevented by coating the surfaces with the lithium molybdenum vanadate, so that unnecessary side reactions are reduced, the growth of a CEI film is prevented, and the structural stability of the single-crystal LiNi < 0.8 > Co < 0.1 > Mn < 0.1 > O < 2 > material is improved. And the lithium molybdenum vanadate is a fast ion conductor, so that the lithium ion de-intercalation capability can be enhanced, and the rate capability of the material is further improved.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a method for preparing a single crystal high-nickel ternary positive electrode material which is sintered at low temperature and achieves in-situ coating. Background technique [0002] In the context of the continuous heating up of the field of new energy vehicles, lithium-ion batteries are also gradually developing under the impetus of the market. As far as the general level in the industry is concerned, the performance data of ternary cathode materials are relatively excellent. However, with the continuous improvement of consumer market demand and the continuous development of new energy fields, the performance of ternary cathode materials needs to be further improved to meet higher energy density requirements. [0003] Traditional high-nickel ternary cathode materials are usually spherical secondary particles, which a...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 刘云建曾天谊窦爱春周玉苏明如潘凌理
Owner JIANGSU UNIV
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