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Cathode material, preparation method thereof and battery using cathode material

A technology of composite oxides and precursors, applied in the field of preparation, lithium-nickel-manganese-cobalt-fluorine composite oxide materials and their precursors, and lithium-ion secondary batteries, can solve the problem of poor cycle performance of positive electrode materials, Difficult to control and other problems, to achieve the effect of easy control of sedimentation ratio, good layered structure and good cycle performance

Active Publication Date: 2013-04-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: the precipitation of nickel, manganese and cobalt ions in the preparation method in the prior art is not easy to control, and the cycle performance of preparing positive electrode materials is poor

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  • Cathode material, preparation method thereof and battery using cathode material
  • Cathode material, preparation method thereof and battery using cathode material
  • Cathode material, preparation method thereof and battery using cathode material

Examples

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preparation example Construction

[0028] A preparation method of lithium-nickel-manganese-cobalt-fluorine composite oxide, which comprises:

[0029] (1) Add the mixed solution of nickel salt, cobalt salt and manganese salt and the precipitant solution containing fluorine ions into the reaction kettle for reaction and precipitation. After the reaction is completed, rinse the precipitated product with deionized water for 3 times, and suction filter , dried at 80°C for 2-12 hours to make a precursor;

[0030] (2) Mix the precursor and the lithium-containing compound at a ratio of 1:1 to 1.1, and sinter at high temperature in an oxygen-containing atmosphere.

[0031] The present invention may also include grinding and sieving the sintered product after high-temperature sintering.

[0032] The mixed solution of nickel salt, cobalt salt and manganese salt refers to a mixed solution in which nickel salt, cobalt salt and manganese salt are dissolved in deionized water in a certain proportion to form 2 mol / l.

[0033...

Embodiment 1

[0063] Be 1: 1: 1 by weighing manganese sulfate, nickel sulfate, cobalt sulfate and prepare 28L of the mixed solution of nickel salt, cobalt salt, manganese salt of 2mol / L; 20L of precipitant solution containing fluoride ion in concentrated ammonia water, where F - The concentration is 0.1mol / L, NH 3 The concentration is 1.2mol / L, and the pH is 11.5.

[0064] Add the mixed solution of nickel salt, cobalt salt and manganese salt and the precipitant solution into the reaction kettle, keep the stirring speed at 500 rpm, and feed nitrogen at a speed of 50 mL / min. Control the pH value at 11.5, react for 20 hours, release the reaction product, wash and dry. get the precursor.

[0065] The precursor and lithium carbonate were mixed and sintered at a molar ratio of 1:1.05, kept at 650°C for 5 hours, then heated to 950°C for 20 hours, then slowly cooled to room temperature with the furnace temperature, taken out, ground and crushed for 200 Mesh sieve, the obtained lithium-nickel-ma...

Embodiment 2

[0076] The difference from Example 1 is that the F in the precipitant containing fluoride ions - The concentration is 0.2mol / L. Others are the same as in Example 1, and the lithium-nickel-manganese-cobalt-fluorine composite oxide is prepared as G2. The battery is denoted as A2.

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Abstract

The invention provides a cathode material of a Li-ion secondary battery, the general formula is LiNiaMnbCocO2-XFX, wherein the relationships that a is more than or equal to 0.1 and less than or equal to 0.45, b is more than or equal to 0.1 and less than or equal to 0.45, c is more than or equal to 0.1 and less than or equal to 0.45 and a+b+c=1 are satisfied; the relationship that X is more than or equal to 0.001 and less than or equal to 0.2 is satisfied; Li-Ni-Mn-Co-Fl composite oxide is in an R-3m rhombus lamellar structure; and in XRD, the value of R is 0.25-0.42. The invention also discloses a preparation method of the cathode material, which comprises the following steps: adding the mixed solution of nickel salt, cobalt salt and manganese salt and precipitator solution containing fluorion into an agitated reactor to react and precipitate; after the reaction is completed, washing and drying the precipitation, and preparing the precipitation into a precursor; mixing the precursor and composite containing lithium in the proportion of mass of 1:1 to 1.1; and sintering in the environment atmosphere containing oxygen at a high temperature. The cathode material provided by the invention has good cycle performance and easy control of metal ion precipitation.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery cathode materials, and in particular relates to a lithium-nickel-manganese-cobalt-fluorine composite oxide material, its precursor, a preparation method and a lithium-ion secondary battery using the cathode material. Background technique [0002] At present, lithium-ion battery cathode materials on the market are mainly lithium cobalt oxide, which has good electrochemical performance, but its low capacity, poor safety, high price and other problems have gradually emerged with the development of batteries, and there is an urgent need other materials instead. At present, materials that can replace lithium cobaltate include lithium nickelate, lithium manganate, lithium manganate, etc. Lithium nickelate has a high capacity, but it is difficult to prepare, difficult to synthesize materials with better performance, and poor safety; lithium manganate is safe Well, the cost is low, but its relatively l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/50H01M4/52H01M4/04H01M10/36H01M10/40C01G53/04C01B13/14
CPCY02E60/12Y02E60/10
Inventor 游军飞张意先雪峰刘会权
Owner BYD CO LTD
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