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Cathode material, preparation method thereof and battery using cathode material

A technology of composite oxides and precursors, applied in battery electrodes, secondary batteries, electrode manufacturing, etc., can solve the problems of difficult control, poor cycle performance of positive electrode materials, etc., achieve good layered structure, easy control of precipitation ratio, Good cycle performance

Active Publication Date: 2010-07-21
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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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 fluoride ions into the reaction kettle to react and precipitate. After the reaction is completed, rinse the precipitated product with deionized water for 3 times, and filter by suction ,Dry at 80℃ for 2-12 hours to make a precursor;

[0030] (2) The precursor and the lithium-containing compound are mixed in a ratio of 1:1 to 1.1, and sintered at a 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 prepared by dissolving nickel salt, cobalt salt, and manganese salt in deionized water in a certain proportion to form a 2mol / l mixed soluti...

Embodiment 1

[0063] According to the material ratio of 1:1:1, weigh manganese sulfate, nickel sulfate, and cobalt sulfate to prepare 28L of a 2mol / L mixed solution of nickel salt, cobalt salt, and manganese salt; at the same time use sodium hydroxide, sodium fluoride, 20L of fluoride ion-containing precipitation agent solution of 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] The mixed solution of nickel salt, cobalt salt and manganese salt and the precipitant solution are added to the reaction kettle, and the stirring speed is maintained at 500 rpm and the nitrogen gas flow rate is 50 mL / min. Control the pH value at 11.5, react for 20 hours, and release the reaction product for washing and drying. Get the precursor.

[0065] The precursor and lithium carbonate were mixed and sintered at a molar ratio of 1:1.05, first kept at 650°C for 5 hours, then heated to 950°C and sintered for 20 hours, then slowly coole...

Embodiment 2

[0076] The difference from Example 1 is that the F in the fluoride ion-containing precipitation agent - The concentration is 0.2mol / L. Others are the same as in Example 1. The lithium-nickel-manganese-cobalt-fluorine composite oxide obtained is referred to 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 specifically relates to a lithium-nickel-manganese-cobalt-fluorine composite oxide material and its precursor, a preparation method and a lithium ion secondary battery using the cathode material. Background technique [0002] At present, the cathode material for lithium-ion batteries on the market is mainly lithium cobalt oxide, which has good electrochemical performance, but its low capacity, poor safety, and high price are gradually emerging with the development of batteries, and it is urgently needed Replace with other materials. At present, the materials that can replace lithium cobalt oxide include lithium nickelate, lithium manganate, lithium manganate, etc. Lithium nickelate has a high capacity, but it is difficult to prepare, and it is difficult to synthesize materials with better performance, and the safety is poor; the safety of lithium manganate Good, low cost, but ...

Claims

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Application Information

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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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