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Doping and surface coating lithium nickel cobalt dioxide and its preparing method

A technology of surface coating and lithium nickel cobalt oxide, which is applied in the direction of electrode manufacturing, electrical components, battery electrodes, etc., can solve the problems of lack of market competitive advantage, raw material cost cannot be reduced, and high raw material cost, and is suitable for industrial scale production , low production cost, high specific capacity effect

Inactive Publication Date: 2007-06-20
黎彦希
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent application No. 03112435.6 has announced "the method of preparing lithium cobaltate lithium ion battery anode material with nano-cobalt tetroxide as raw material". Although this method can produce good lithium cobaltate particle morphology, it uses expensive Cobalt raw material, so that the raw material cost of the product cannot be reduced
Chinese patent application No. 02155659.8 announced "Preparation method of lithium cobalt oxide, positive electrode active material of lithium ion battery". The residual alkaline process in the primary product is a measure to optimize lithium cobaltate, but it is still pure lithium cobaltate without doping, and the cost of raw materials is too high
Lack of market competitive advantage

Method used

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  • Doping and surface coating lithium nickel cobalt dioxide and its preparing method
  • Doping and surface coating lithium nickel cobalt dioxide and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Take by weighing the higher purity reactant raw material lithium carbonate, nickel carbonate, cobalt carbonate, magnesium carbonate, mix grind;

[0037] (2) Using the heating device of the electric heating tunnel heating furnace, put the mixed and ground mixture raw materials into a flat-bottomed ceramic bowl, and put it into a quarter of the capacity of the bowl. The ceramic flat-bottomed bowl with good raw materials is sent into the tunnel heating furnace for heating through porcelain rollers, and the air atmosphere is heated at a heating rate of 20°C / min. When the temperature reaches 300°C, it is kept for 0.5 hours;

[0038] (3) Take the ceramic flat-bottomed bowl of step (2) out of the furnace, wait for it to cool, and then fill it with a mixture of a quarter of its capacity, vibrate the surface, reset the heating furnace to heat, air atmosphere, according to the heating rate Heating at 20°C / min, when the temperature reaches 300°C, hold for 0.5 hours;

[0039]...

Embodiment 2

[0048] The difference from Example 1 is that manganese carbonate is used instead of magnesium carbonate, and the consumption is also that the mole fraction of manganese is 0.1.

Embodiment 3

[0050] The difference from Example 1 is that nickel oxide, cobalt oxide, and magnesium oxide are used instead of nickel carbonate, cobalt carbonate, and magnesium carbonate in Example 1, and the mole fraction ratio of each metal element remains unchanged.

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Abstract

This invention relates to lithium ion battery positive electrode mixture and surface nickel-to-cobalt acid lithium and its process method, which is characterized by the following: materials particle inner crystal core is LiNixCoyMgzO2 or LiNixCoyMnzO2; mixing Mg, Mn, or rare earth; outside surface layer is of nanometer MgO. The process method adopts three times adding and heating under 800 degrees temperature. The advantages of this invention embodies in crystal, structure, particle shape, large intensity and good flow and large capacity.

Description

(1) Technical field [0001] The invention relates to a lithium-ion secondary battery cathode material, in particular to a doped and surface-coated lithium nickel cobalt oxide and a preparation method thereof. (2) Technical background [0002] In 1980, B.Goodenough and others first synthesized lithium cobaltate (LiCoO) from cobalt carbonate and lithium carbonate at high temperature. 2 ), and the performance of its fabricated batteries was studied. In 1991, realized by LiCoO 2 The commercial production of lithium-ion secondary batteries as positive electrode materials has the advantages of high output voltage, high energy density, long cycle life, and no memory effect. It is widely used in mobile communications, mobile computers, mobile appliances, electric vehicles, aerospace , biomedical engineering and other fields have been widely used. LiCoO 2 It has excellent performance in voltage stability, reversibility, discharge capacity, charge and discharge efficiency, etc., an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/04B22F1/02H01M4/485H01M4/62
CPCY02E60/12Y02E60/10
Inventor 黎彦希
Owner 黎彦希
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