Preparation method of modified ternary anode material

A positive electrode material and modification technology, which is applied in the field of preparation of modified ternary positive electrode materials, can solve the problems of poor cycle stability of ternary positive electrode materials, achieve the effect of improving poor cycle stability and prolonging cycle life

Inactive Publication Date: 2018-11-13
NANTONG BAICHUAN NEW MATERIAL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method of a modified ternary cathode material, which can improve the first-time efficiency of the modified ternary cathode material and effectively improve the defect of poor cycle stability of the ternary cathode material

Method used

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  • Preparation method of modified ternary anode material

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Embodiment 1

[0021] The preparation method of the modified ternary positive electrode material in this embodiment, the positive electrode material is coated with polyvinylpyrrolidone resin on the ternary positive electrode material, and an amorphous carbon coating layer is formed on the surface of the ternary positive electrode material. Polyvinylpyrrolidone is organic Silicon modified polyvinylpyrrolidone, the ternary cathode material is LiNixCoyMnzO 2 , where 0.3 ≤ x ≤ 1, 0 ≤ y≤ 0.5, 0 ≤ z ≤ 0.5, and x+y+z=1; the specific preparation method includes the following steps:

[0022] (1) Mix 5g modified polyvinylpyrrolidone with 100g LiNi 0.5 co 0.2 mn 0.3 o 2 Ternary cathode material is mixed in the ethanol of 420g to obtain mixture A;

[0023] (2) After stirring for 1 hour at 20°C, filter to obtain mixture B;

[0024] (3) The mixture B was heated and carbonized under the protection of air, the carbonization temperature was 300°C, and the carbonization time was 5 hours. The carbonizatio...

Embodiment 2

[0027] The preparation method of the modified ternary positive electrode material in this embodiment, the positive electrode material is coated with polyvinylpyrrolidone resin on the ternary positive electrode material, and an amorphous carbon coating layer is formed on the surface of the ternary positive electrode material. Polyvinylpyrrolidone is organic Silicon modified polyvinylpyrrolidone, the ternary cathode material is LiNixCoyMnzO 2 , where 0.3 ≤ x ≤ 1, 0 ≤y ≤0.5, 0 ≤ z ≤ 0.5, and x+y+z=1; the specific preparation method includes the following steps:

[0028] (1) Mix 20g modified polyvinylpyrrolidone with 100g LiNi 0.5 co 0.2 mn 0.3 o 2 Ternary cathode material is mixed in the ethanol of 1200g to obtain mixture A;

[0029] (2) Stir at 90°C for 2 hours and then filter to obtain mixture B;

[0030] (3) The mixture B was heated and carbonized in the air atmosphere, the carbonization temperature was 700°C, and the carbonization time was 1h to obtain the mixture C;

...

Embodiment 3

[0033] The preparation method of the modified ternary positive electrode material in this embodiment, the positive electrode material is coated with polyvinylpyrrolidone resin on the ternary positive electrode material, and an amorphous carbon coating layer is formed on the surface of the ternary positive electrode material. Polyvinylpyrrolidone is organic Silicon modified polyvinylpyrrolidone, the ternary cathode material is LiNixCoyMnzO 2 , where 0.3 ≤ x ≤ 1, 0 ≤ y≤ 0.5, 0 ≤ z ≤ 0.5, and x+y+z=1; the specific preparation method includes the following steps:

[0034] (1) Mix 15g modified polyvinylpyrrolidone with 100g LiNi 0.5 co 0.2 mn 0.3 o 2 Ternary cathode material is mixed in the ethanol of 700g to obtain mixture A;

[0035] (2) Stir at 50°C for 1.5h and then filter to obtain mixture B;

[0036] (3) The mixture B was heated and carbonized in the air atmosphere, the carbonization temperature was 500°C, and the carbonization time was 3 hours to obtain the mixture C; ...

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Abstract

The invention relates to a preparation method of a modified ternary anode material. According to the anode material, a ternary anode material is coated with polyvinylpyrrolidone resin to form an amorphous carbon coating layer on the surface of the ternary anode material; polyvinylpyrrolidone is organic silicon modified polyvinylpyrrolidone; the ternary anode material is LiNixCoyMnzO2, wherein x ismore than or equal to 0.3 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 0.5, and z is more than or equal to 0 and less than or equal to 0.5, and x+ y+ z=1. The preparation method specifically comprises the following steps: mixing the polyvinylpyrrolidone and the ternary anode material in ethanol, then stirring and filtering the mixture, heating the mixture tocarbonize the mixture, and finally cooling and smashing the product. The preparation method disclosed by the invention has the advantages that the modified polyvinylpyrrolidone and the ternary anodematerial are treated to prepare the modified ternary anode material, and the initial efficiency of the modified ternary anode material is 13 percent higher than that of a non-modified material; the initial efficiency of a ternary anode material coated sample is higher than that of a non-modified ternary material, and the later cycle efficiency of the sample is also 60 percent higher than that of the non-modified material; the defect of low cycle stability of the ternary anode material can be effectively improved.

Description

technical field [0001] The invention belongs to the field of new energy battery materials, and in particular relates to a preparation method of a modified ternary cathode material. Background technique [0002] Large-scale energy storage, electric tools, electric vehicles, and portable electronic devices have put forward higher and higher requirements for the specific energy, specific power, safety, and cycle life of lithium-ion batteries. Although the performance of lithium-ion batteries is affected by many factors such as positive and negative electrode materials, electrolytes, binders, current collectors, and separators, the key to affecting its electrochemical performance lies in the performance of the electrolyte and positive and negative electrode materials that make up the battery. The positive electrode material is It is one of the keys that affect the electrochemical performance of lithium-ion batteries. [0003] At present, in the ternary cathode material of lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 郑铁江曹圣平赵跃周国君唐义曾怀政
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD
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