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Lithium ion battery anode material as well as preparation method and battery thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of lithium-ion battery positive electrode materials and their preparation and batteries, and can solve problems such as agglomeration, low discharge specific capacity of materials, and low production capacity

Active Publication Date: 2009-11-25
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of lithium-nickel composite oxide materials prepared in the prior art, such as agglomeration, low production capacity, and low discharge specific capacity of the material

Method used

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  • Lithium ion battery anode material as well as preparation method and battery thereof
  • Lithium ion battery anode material as well as preparation method and battery thereof
  • Lithium ion battery anode material as well as preparation method and battery thereof

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preparation example Construction

[0026] Since the present invention only relates to the improvement of the preparation method of the positive electrode of the lithium secondary battery, other steps are known to those skilled in the art except that the positive electrode is prepared according to the method provided by the present invention. In general, it includes disposing a separator between the positive electrode and the negative electrode to form an electrode group, accommodating the electrode group in a battery case, injecting an electrolyte solution, and sealing the battery case.

[0027] The present invention only relates to the improvement of the preparation method of the positive electrode of the battery, so there is no special limitation on the composition and structure of the lithium secondary battery (unless otherwise specified, the reagents involved in the specific embodiments of the present invention are commercially available analytical reagents) .

[0028] For example, the current collector can...

Embodiment 1

[0039] (1) Preparation of cathode material

[0040] Aluminum-containing high-cobalt spherical nickel Ni 0.80 co 0.15 al 0.05 (OH) 2 Mix well with lithium carbonate at a molar ratio of 1:0.53, calcinate the mixture at 600°C for 6 hours in an oxygen atmosphere, then sinter in situ at 800°C for 15 hours in an oxygen atmosphere, cool the product, crush it and gas crush it to obtain spherical lithium nickel cobalt Alumina material LiNi 0.80 co 0.15 al 0.05 o 2 Precursor. Will LiNi 0.8 0Co 0.15 al 0.05 o 2 The precursor was annealed and sintered for the third time at 800° C. for 4 hours in an oxygen atmosphere, and the product was cooled, crushed, and gas-crushed to obtain positive electrode material A.

[0041] (2) Preparation of positive electrode sheet

[0042] Dissolve 30 grams of polyvinylidene fluoride (PVDF) in 450 grams of N-methylpyrrolidone (NMP) solvent to prepare a binder solution, then add 940 grams of positive active material and 30 grams of acetylene blac...

Embodiment 2

[0051] The synthesis method and battery manufacturing method are the same as in Example 1, except that the Ni 0.80 co 0.15 Al 0.05 (OH) 2 Replaced with manganese-containing high-cobalt spherical nickel Ni 0.80 co 0.16 mn 0.04 (OH) 2 , the prepared cathode material is LiN i0.80 co 0.16 mn 0.04 o 2 .

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Abstract

The invention relates to a lithium ion battery anode material LiNi 1-x-y Cox My O2 as well as a preparation method and a battery thereof. In the formula of the material, x is not less than 0.01 and not more than 0.20, y is not less than 0 and not more than 0.10, and M is one or the composite of Mn, Al, Ti, Cr, Mg, Ca, V, Fe and Zr. The lithium ion battery anode material is characterized in that the ratio of the intensity I 003 of the (003) crystal face diffraction peak and the intensity I 104 of the (104) crystal face diffraction peak of LiNi 1-x-y Cox My O2, namely I003 / I104, is 1.21 to 1.26, and the difference value delta 2 theta of (108) crystal face diffraction peak and (110) crystal face diffraction peak is 0.520 to 0525. The prepared material has the advantages of high output, difficult agglomeration and higher discharge specific capacity.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, a preparation method thereof and a battery. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy density, high working voltage, long life, no memory, and low toxicity, and are widely used in current portable electronic devices. At present, with the promotion and popularization of various high-energy consumption small electronic products, such as mobile phones and notebook computers, the market has put forward an urgent demand for high-capacity lithium-ion secondary batteries. The energy bottleneck of lithium batteries lies in the volumetric energy density of cathode materials. Take LiNi 1-x-y co x m y o 2 The representative spherical lithium nickelate and its derivatives have excellent fluidity, dispersibility, and high tap density, which is conducive to the production of battery slurry and the coating of battery electrode s...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/48H01M10/04
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 夏冬炎
Owner BYD CO LTD
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