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Cathode material for boracic lithium ion battery and preparation method thereof

A cathode material, ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing the gram capacity and discharge voltage platform of the cathode material, and the improvement effect is limited, and achieve good battery electrochemical performance and capacity retention performance. , to avoid the effect of decomposition

Inactive Publication Date: 2016-01-13
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many documents and patents at home and abroad have reported the use of Al 2 o 3 , AlPO 4 , ZrO 2 、TiO 2 , B 2 o 3 The technology of coating the positive electrode material with such oxides, although the cycle performance of the coated material has been improved, the actual improvement effect is very limited, and it will also reduce the gram capacity and discharge voltage platform of the positive electrode material, etc.

Method used

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  • Cathode material for boracic lithium ion battery and preparation method thereof
  • Cathode material for boracic lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] First, 5.0g of boric acid was dissolved in 250ml of water and added to the coating kettle; secondly, doped lithium cobaltate (molecular formula: LiCo 0.949 Zr 0.001 Mg 0.05 o 2 ) 1200g was added to the coating kettle, the stirring speed was 600r / min, and the stirring was even. Finally, 2.0 g of cerium nitrate was dissolved in 50 ml of water and added to the coating kettle. Turn on the heat and dry while stirring. Place the dried lithium cobaltate powder in a box furnace at a rate of 5°C / min to 700°C and keep it for 6 hours, then pass through a 300-mesh sieve after cooling down to room temperature in the furnace, and then the boron-containing inorganic high Molecular polymer coated lithium cobalt oxide powder. After the powder is mixed, pulped, coated, dried and rolled, assembled, liquid injected, statically formed and aged, the 4.5V half-cell 0.5C charge and discharge test is carried out to test the cycle performance of the material under high voltage; Conduct 1C ...

Embodiment 2

[0044] First, dissolve 15.0g of aluminum borate in 250ml of water and add it to the coating kettle; secondly, the ternary material with an average particle size of 12μm (molecular formula: LiNi 0.5 co 0.2 mn 0.3 o 2 ) 1000g was added to the coating kettle, the stirring speed was 500r / min, and the stirring was even. Finally, 2.0 g of lanthanum nitrate was dissolved in 80 ml of water and added to the coating kettle. Turn on the heat and dry while stirring. Put the dried ternary material powder in a box furnace at a rate of 5°C / min to 800°C and keep it for 6 hours, then pass through a 300-mesh sieve after cooling to room temperature with the furnace, and then the boron-containing inorganic high Molecular polymer coated lithium cobalt oxide powder. After the powder is mixed, pulped, coated, dried and rolled, assembled, liquid injected, statically formed and aged, the 4.5V half-cell 0.5C charge and discharge test is carried out to test the cycle performance of the material und...

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Abstract

The invention discloses a cathode material for a boracic lithium ion battery and a preparation method thereof. The cathode material for the lithium ion battery disclosed by the invention comprises two parts including a composite oxide core and a coating layer. The core is single or is doped with ternary materials such as modified lithium cobalt oxide, nickel cobalt manganese or nickel cobalt aluminum, lithium manganese oxide, lithium iron phosphate, lithium-rich manganese and the like, and the coating layer is a high-molecular polymer containing boron-oxygen bonds. The preparation method of the composite cathode material for the lithium ion battery disclosed by the invention is simple in technology, easy in process control and convenient for industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a boron-containing lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as cameras and mobile phones, as well as electric vehicles and large power supplies due to their high discharge specific capacity, good safety, and long cycle life. The performance of lithium-ion batteries mainly depends on the positive electrode materials of lithium-ion batteries. At present, the positive electrode materials mainly include lithium cobaltate, nickel-cobalt-manganese or nickel-cobalt-aluminum ternary materials, lithium ferrous phosphate and lithium manganate, etc., but these positive electrodes Materials have their own defects. For example, lithium cobalt oxide is expensive, has poor overcharge resistance, and its gram capacity at ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCY02E60/10
Inventor 李珊珊陈彦彬李栋梁刘亚飞
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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