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High-capacity lithium ion battery cathode material and preparation method thereof

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low compaction density, reduced electrical performance, and low specific capacity of lithium cobalt oxide, and achieves increased specific capacity and electrical conductivity. The effect of improving the stability and voltage platform

Inactive Publication Date: 2014-12-10
ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium cobaltate has the characteristics of high compaction, good electrical conductivity and cycle performance, but the specific capacity of lithium cobaltate is low, and increasing the compaction density will lead to a decrease in other electrical properties, and there is room for further increase in energy density smaller
Therefore, it is imperative to develop positive electrode materials with high specific capacity. Nickel-cobalt lithium aluminate positive electrode materials have the advantages of high specific capacity, good cycle performance, and cheap raw materials, but their low electrical conductivity and low compacted density limit the use of this material at high Application of Energy Density Li-ion Batteries

Method used

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  • High-capacity lithium ion battery cathode material and preparation method thereof
  • High-capacity lithium ion battery cathode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] Will LiNi 0.8 co 0.15 al 0.05 o 2 The two active materials and lithium cobalt oxide were dry mixed at a ratio of 5:5, and the mixing time was 2 hours.

[0029] Aluminum nitrate is prepared into aluminum nitrate solution at room temperature, and the above-mentioned mixed active material is added to the aluminum nitrate solution and stirred to form a solid-liquid mixture, so that the aluminum nitrate solution is evenly coated on the surface of the active material particles; after being calcined by aluminum nitrate form Al 2 o 3 The mass accounts for 1% of the active substance mass after mixing.

[0030] Dry the above-mentioned solid-liquid mixture, put the dried solid material into a furnace for roasting, raise the temperature to 500°C at a rate of 4°C / min, keep it at 500°C for 7 hours, cool, pulverize, and sieve to obtain a compound Cathode material.

[0031] The electrochemical performance test of the material is tested at 25°C with a blue battery test system, an...

Embodiment 2

[0033] Will LiNi 0.8 co 0.15 al 0.05 o 2 and lithium cobaltate two active materials were dry mixed at a ratio of 6:4, and the mixing time was 2 hours.

[0034] Aluminum nitrate is prepared into aluminum nitrate solution at room temperature, and the above-mentioned mixed active material is added to the aluminum nitrate solution and stirred to form a solid-liquid mixture, so that the aluminum nitrate solution is evenly coated on the surface of the active material particles; after being calcined by aluminum nitrate form Al 2 o 3 The mass accounts for 0.5% of the active substance mass after mixing.

[0035] Dry the above-mentioned solid-liquid mixture, put the dried solid material into a furnace for roasting, raise the temperature to 600°C at a rate of 4°C / min, keep it at 600°C for 6 hours, cool, pulverize, and sieve to obtain a compound Cathode material.

Embodiment 3

[0037] Will LiNi 0.8 co 0.1 al 0.1 o 2 and lithium cobaltate two active materials were dry mixed at a ratio of 4:6, and the mixing time was 2 hours.

[0038] Aluminum nitrate is prepared into aluminum nitrate solution at room temperature, and the above-mentioned mixed active material is added to the aluminum nitrate solution and stirred to form a solid-liquid mixture, so that the aluminum nitrate solution is evenly coated on the surface of the active material particles; after being calcined by aluminum nitrate form Al 2 o 3 The mass accounts for 2% of the active substance mass after mixing.

[0039] Dry the above-mentioned solid-liquid mixture, put the dried solid material into a furnace for roasting, raise the temperature up to 700°C at a rate of 4°C / min, keep it at 700°C for 5 hours, cool, pulverize, and sieve to obtain a compound Cathode material.

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Abstract

The invention relates to a high-capacity lithium ion battery cathode material and a preparation method thereof. The material consists of two active substances, namely LiNi<1-a-b>CoaAlbO2 and lithium cobalt oxide, as well as Al2O3 coating layers coating the surfaces of the active substances, wherein a is larger than 0.1 and smaller than 0.3, b is larger than 0.01 and smaller than 0.2, and 1-a-b is larger than 0 and smaller than 1; a lithium nickel and cobalt aluminate material accounts for 10-90 percent of the mass sum of the lithium nickel and cobalt aluminate material and the lithium cobalt oxide; the mass ratio of the Al2O3 coating layers to the active substances is (0.001-0.05):1. The preparation method comprises the following steps: uniformly mixing the two active substances, namely the LiNi1-a-bCoaAlbO2 and the lithium cobalt oxide according to the certain proportion; adding the mixture into a trivalent aluminum source solution and stirring to form a solid-liquid mixture; enabling the trivalent aluminum source solution to uniformly coat the surfaces of active substance particles; drying and calcining to obtain the high-capacity lithium ion battery cathode material. The specific capacity of the material disclosed by the invention is greatly improved compared with that of the lithium cobalt oxide; the compaction density, the conductivity and a voltage platform of the material are greatly improved compared with those of the lithium nickel and cobalt aluminate material; the material has better rate performance and cycle performance.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a high-capacity lithium ion battery cathode material and a preparation method thereof. technical background [0002] Lithium-ion batteries have been widely used in mobile digital products such as mobile phones, cameras, and notebook computers. With the advancement of science and technology, the application fields of lithium-ion batteries will become wider and wider, and the requirements for their size, weight, and service life will become higher and higher. As the market continues to grow, cathode materials such as lithium cobalt oxide, lithium iron phosphate, and lithium manganese oxide currently used in the market have been difficult to meet the market's demand for high energy density of lithium-ion batteries. [0003] Under the condition of the same capacity, to increase the volume energy density of the battery, it is necessary to increase the filling amount of the active material per...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/364H01M4/485H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 毛玉琴韩珽
Owner ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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