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A kind of preparation method of NAF-coated lithium-rich manganese-based layered cathode material

A cathode material, lithium-rich manganese technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of capacity decay, low first efficiency, poor rate performance, etc., and achieve improved discharge capacity, low raw material cost, and stable crystal structure. Effect

Active Publication Date: 2015-08-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the first low efficiency, poor rate performance, cycle process In order to solve problems such as medium capacity fading, the solution of coating a layer of NAF on the surface of the lithium-rich manganese-based layered cathode material by using the liquid phase method was proposed for the first time. Preparation method of lithium-manganese-based layered cathode material

Method used

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  • A kind of preparation method of NAF-coated lithium-rich manganese-based layered cathode material
  • A kind of preparation method of NAF-coated lithium-rich manganese-based layered cathode material
  • A kind of preparation method of NAF-coated lithium-rich manganese-based layered cathode material

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Embodiment 1

[0031] The NAF coating lithium-rich manganese-based layered lithium-ion battery positive electrode material of the present embodiment is that the chemical formula is Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 The outer surface of the lithium-rich manganese-based cathode material with a layered structure is coated with NAF; in the example, NAF is a pure phase (NH 4 ) 3 AlF 6 , the coating amount is NAF / Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 The mass ratio is 1%.

[0032] Its preparation method is:

[0033] (1) Prepare the mixture: according to the molecular formula, it is Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 The ratio of the molar ratio of Mn:Ni:Co=54:13:13 hydroxide precursor 10g and 7.3g of 96% purity of LiOH·H 2 O, added to the mixing tank, mixed evenly, to obtain the elemental composition as Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 mixture;

[0034] (2) Sintering and grinding: the element composition obtained in step (1) is Li[Li 0.2 mn 0.54 Ni 0.13 co...

example 2

[0038] In example 2 and example 3, except NAF / Li[Li in step (2) 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 Except that the mass ratio is different, other experimental steps are all the same as example 1, wherein in example 2 NAF / Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 =3%, NAF / Li[Li in Example 3 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 =5%.

[0039] XRD pattern analysis

[0040] The NAF-coated lithium-rich manganese-based layered lithium-ion battery positive electrode material obtained in the embodiment, the manganese-based layered layered positive electrode material obtained in step (2) and the pure NAF obtained under the same conditions were subjected to XRD analysis. The results are as follows: figure 1 As shown, it shows that the coating is pure phase NAF. The NAF coated lithium-rich manganese-based layered lithium-ion battery positive electrode material obtained in the example and the lithium-rich manganese-based layered layered positive electrode material obtained in step (2)...

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Abstract

A preparation method of a sodium fluoride (NAF) coated lithium-manganese-richened base-layer-shaped anode material belongs to the field of an electrode material. NAF on the surface of the lithium-manganese-richened base-layer-shaped anode material is coated by one or two of (NH4)3AlF6 and NH4AlF4, and the preparation method comprises (1) preparing a mixture; (2) sintering and conducting powder handling; (3) scattering an active material in a methyl alcohol solvent and respectively preparing an aluminum salt solution and a fluoride solution which are soluble to the methyl alcohol solvent; (4) simultaneously dripping two prepared solutions, controlling the temperature and stirring; and (5) drying obtained slurry in the step (4), burning at the temperature of 80-200 DEG C for 8-24 hours, and then obtaining the coated anode active material. The obtained NAF coated lithium-manganese-richened base-layer-shaped anode material is high in capacity, high in first efficiency, high in stability and good in multiplying power performance. Particularly a manganese element is adopted to serve as a base, raw material cost is low, and the preparation method is applicable to application of large-scale cell equipment such as cells of electric vehicles.

Description

Technical field: [0001] The present invention relates to a kind of positive pole material of lithium ion battery and preparation method thereof, relate in particular to a kind of NAF ((NH 4 ) 3 AlF 6 and NH 4 AlF 4 A lithium-rich manganese-based layered cathode material coated with one or a mixture of the two) and a preparation method thereof. Background technique: [0002] In today's increasingly depleted resources, the development of green and clean energy has become particularly important. Lithium-ion battery, as an energy storage and output system, has become an indispensable part of electronic products, and more importantly, lithium-ion battery is the most likely to replace petroleum and become the power source of automobiles. The dependence on petroleum energy and the reduction of pollutant emissions are of great significance. Judging from the future development trend, lithium-ion batteries have broad application prospects. The electrochemical performance of lit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 李建玲陈宇徐国峰
Owner UNIV OF SCI & TECH BEIJING
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