Surface-carbon-modified cathode material of lithium ion battery and method for preparing surface-carbon-modified cathode material

A lithium-ion battery, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of low rate performance of materials, and achieve the effects of excellent rate performance, simple operation, and increased specific capacity

Inactive Publication Date: 2012-07-04
MCNAIR TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome LiNi 0.5 mn 1.5 o 4 The disadvantage of low material rate performance, thus providing a surface carbon-modified lithium-ion battery positive electrode material with excellent rate performance and its preparation method

Method used

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  • Surface-carbon-modified cathode material of lithium ion battery and method for preparing surface-carbon-modified cathode material
  • Surface-carbon-modified cathode material of lithium ion battery and method for preparing surface-carbon-modified cathode material
  • Surface-carbon-modified cathode material of lithium ion battery and method for preparing surface-carbon-modified cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 0.05 mol of lithium acetate, 0.025 mol of nickel acetate, and 0.0725 mol of manganese acetate were mixed uniformly in a mortar and ground to obtain a light blue mixture. Then pre-fired at 580°C in a muffle furnace for 5 hours, and the heating rate was 5°C / min. After pre-burning, a reddish-brown precursor was obtained. First calcined, the heating rate is 10 / min, and kept at 850 ° C for 8 hours, then annealed at 700 ° C for 10 hours, and then cooled with the furnace to obtain black LiNi 0.5 mn 1.5 o 4 Material.

[0025] Add LiNi in water at a molar ratio of 1:5:1:2 0.5 mn 1.5 o 4 , cetyltrimethylammonium bromide, resorcinol and formaldehyde solution, then add a small amount of sodium carbonate, stir evenly at 80°C and react for 15 minutes to obtain LiNi coated with aldol resin on the surface 0.5 mn 1.5 o 4 Material, filter washed, dried LiNi 0.5 mn 1.5 o 4 material, and then in the inert atmosphere of a tube furnace, carbonize aldol resin to obtain carbon-modif...

Embodiment 2

[0027] 0.05 mol of lithium acetate, 0.025 mol of nickel acetate, and 0.0725 mol of manganese acetate were mixed uniformly in a mortar and ground to obtain a light blue mixture. Then pre-fired at 580°C in a muffle furnace for 5 hours, and the heating rate was 5°C / min. After pre-burning, a reddish-brown precursor was obtained. First calcined, the heating rate is 10°C / min, and kept at 850°C for 8 hours, then annealed at 700°C for 10 hours, and then cooled with the furnace to obtain black LiNi 0.5 mn 1.5 o 4 Material.

[0028] Add LiNi in water at a molar ratio of 1:10:2:4 0.5 mn 1.5 o 4 , cetyltrimethylammonium bromide, resorcinol, formaldehyde solution, and then add a small amount of sodium carbonate, stir evenly at 80°C and react for 30 minutes to obtain LiNi coated with aldol resin on the surface 0.5 mn 1.5 o 4 Material, filter washed, dried LiNi 0.5 mn 1.5 o 4 materials, and then in the inert atmosphere of a tube furnace, carbonize aldol resin to obtain carbon-modi...

Embodiment 3

[0030] 0.05 mol of lithium acetate, 0.025 mol of nickel acetate, and 0.0725 mol of manganese acetate were mixed uniformly in a mortar and ground to obtain a light blue mixture. Then pre-fired at 580°C in a muffle furnace for 5 hours, and the heating rate was 5°C / min. After pre-burning, a reddish-brown precursor was obtained. First calcined, the heating rate was 10°C / min, and kept at 850°C for 8 hours, then annealed at 700°C for 10 hours, and then cooled with the furnace to obtain black LiNi 0.5 mn 1.5 o 4 Material.

[0031] Add LiNi in water at a molar ratio of 1:15:3:6 0.5 mn 1.5 o 4 , cetyltrimethylammonium bromide, resorcinol and formaldehyde solution, then add a small amount of sodium carbonate, stir evenly at 80°C and react for 1 hour to obtain LiNi coated with aldol resin on the surface 0.5 mn 1.5 o 4 Material, filter washed, dried LiNi 0.5 mn 1.5 o 4 material, and then in the inert atmosphere of a tube furnace, carbonize aldol resin to obtain carbon-modified Li...

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Abstract

The invention discloses a surface-carbon-modified cathode material of a lithium ion battery and a method for preparing the surface-carbon-modified cathode material. The method comprises the following steps of: firstly, preparing a cathode material lithium manganese nickelate (LiMn0.5Ni1.5O4) of the lithium ion battery; secondly, uniformly stirring the prepared LiMn0.5Ni1.5O4 and an organic solution at a temperature of 80 to 100 DEG C, and performing chemical reaction for 15 to 60 minutes to obtain the cathode material of the lithium ion battery, wherein the surface of the cathode material is coated with high molecules; thirdly, filtering, washing and drying; and finally, carbonizing the cathode material in an inert atmosphere to obtain the surface-carbon-modified cathode material of the lithium ion battery. Compared with a surface-carbon-unmodified cathode material of the lithium ion battery, the surface-carbon-modified cathode material of the lithium ion battery has high rate performance.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a surface carbon-modified lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] The current commercial lithium-ion battery cathode materials generally use lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary materials. Their voltage is generally around 4V, and their energy density is not high. As the display screens of digital products become larger and display resolutions become higher and higher, the requirements for the energy density of lithium-ion batteries used are also higher and higher, and with some new negative electrode materials, such as lithium titanate, etc. Appears, its voltage is relatively high, and the voltage of the positive electrode material is relatively higher. Therefore, in recent years, high-voltage materials for lithium-ion batteries have gradually attracted people's attent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505
CPCY02E60/122Y02E60/10
Inventor 杨亮李伟善李中延王媛刘燕林
Owner MCNAIR TECH
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