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Method for preparing surface modification layer of lithium-rich material based on buffer solution system

A lithium-rich material and buffer solution technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as difficult industrialization and inability to achieve uniform coating, and achieve easy operation, non-toxic and harmless cost, and large discharge The effect of capacity

Active Publication Date: 2013-03-27
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, some means of surface modification of electrode material powders, such as atomic vapor deposition, are difficult to achieve industrialization, while other parts, such as sol-gel method and precipitation method, cannot achieve uniform coating effect, and require higher temperature. heat treatment

Method used

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  • Method for preparing surface modification layer of lithium-rich material based on buffer solution system
  • Method for preparing surface modification layer of lithium-rich material based on buffer solution system
  • Method for preparing surface modification layer of lithium-rich material based on buffer solution system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of lithium-rich materials: according to Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2The proportion of Ni, Co, Mn, Li in the preparation of metal acetate mixed solution; the mixed solution of citric acid, ethylene glycol as a complexing agent added to the metal acetate solution; the final mixed solution at 80 ° C Rotary evaporation to form a sol; the sol was dried in a vacuum oven at 150°C for 6 hours; finally, it was kept at 450°C for 6 hours in an air atmosphere in a tube furnace, and then kept at 850°C for 15 hours to obtain the final product Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 ;

[0027] (2) The prepared Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 Sieve (aperture 0.045mm sieve);

[0028] (3) Take 0.3g of the sieved sample and place it in a beaker, add 50ml of 0.2M PBS pH=7 standard buffer solution;

[0029] (4) Magnetic stirring at room temperature (speed 250rpm), reaction time 5 days;

[0030] (5) Wash the sample after the reaction with deion...

Embodiment 2

[0034] (1) Preparation of lithium-rich materials: according to Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 The proportion of Ni, Co, Mn, Li in the preparation of metal acetate mixed solution; the mixed solution of citric acid, ethylene glycol as a complexing agent added to the metal acetate solution; the final mixed solution at 80 ° C steamed to form a sol; the sol was dried in a vacuum oven at 150°C for 6 hours; finally, the final product Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 ;

[0035] (2) The prepared Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 Sieve (aperture 0.045mm sieve);

[0036] (3) Take 0.3g of the sieved sample and put it in a beaker, add 50ml of 0.1M PBS pH=5.7 standard buffer solution;

[0037] (4) Magnetic stirring at room temperature (speed 500rpm), reaction time 5 days;

[0038] (5) Wash the sample after the reaction with deionized water repeatedly, and dry it in a vacuum oven at 90° C. for 5 hours after suction filtration;

[0039] (6) Heat the above m...

Embodiment 3

[0042] (1) Preparation of lithium-rich materials: according to Li[Li 0.2 Ni 0.1 co 0.1 al 0.06 mn 0.54 ]O 2 The proportion of Ni, Co, Mn, Al, Li in the preparation of metal acetate mixed solution; the mixed solution of citric acid, ethylene glycol as a complexing agent added to the metal acetate solution; the final mixed solution at 80 ℃ The sol was formed by rotary evaporation; the sol was dried in a vacuum oven at 150°C for 6 hours; finally, the final product Li[Li 0.2 Ni 0.1 co 0.1 al 0.06 mn 0.54 ]O 2 ;

[0043] (2) The prepared Li[Li 0.2 Ni 0.1 co 0.1 al 0.06 mn 0.54 ]O 2 Sieve (aperture 0.074mm sieve);

[0044] (3) Take 0.3g of the sieved sample and put it in a beaker, add 50ml of 0.1M PBS pH=7 standard buffer solution;

[0045] (4) Magnetic stirring at room temperature (rotational speed 250rpm), the reaction time is 1 day, 3 days and 5 days respectively;

[0046] (5) Wash the sample after the reaction with deionized water repeatedly, and dry it in a v...

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Abstract

The invention provides a method for preparing a surface modification layer of a lithium-rich material based on a buffer solution system. The method comprises the following steps of: adding the sieved lithium-rich material into a buffer solution with the pH value of 5.7 to 7.0, and reacting for 1 to 5 days; and performing washing, leaching and drying on obtained reaction products to obtain the surface-modified lithium-rich material. According to the method, a synthesized lithium ion positive electrode material is subjected to effective surface treatment by the buffer solution to form a uniform and unexposed coating layer on the surfaces of material particles; the material treated by using the method has relatively large discharge capacity and relatively good cycle performance under a relatively high rate; and the method is simple, the cost is low, the nontoxic and harmless performances can be realized, so that the method is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery cathode materials and electrochemistry, and relates to a modification method of lithium-ion battery cathode nanomaterials, in particular to a method for preparing a lithium-rich material surface modification layer based on a buffer solution system. Background technique [0002] Lithium-ion batteries began to emerge in the 1980s and developed rapidly in the 1990s. In recent years, due to the traditional LiCoO 2 Materials can no longer meet the needs of the market, and seeking high-capacity, high-energy density, and good cycle stability lithium-ion battery cathode materials has become one of the hotspots in international research and development. In many promising alternatives to LiCo 2 Among the positive electrode materials, lithium-rich materials (Li[Li x Ni y co z mn 1-x-y-z ]O 2 ) has attracted extensive attention due to its high specific capacity. Lithium-rich materials for lithium-io...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 马进夏定国
Owner PEKING UNIV
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