A kind of preparation method of lithium ion secondary battery cathode material

A cathode material, secondary battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of affecting battery capacity, insufficient coating integrity, low conductivity, amorphous carbon, etc., and achieve high cycle performance. The effect of improving electrical conductivity and good rate capability

Inactive Publication Date: 2015-09-30
SHENZHEN BAINA NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, organic or inorganic carbon sources are generally used to directly coat lithium iron phosphate, which will improve the conductivity of lithium iron phosphate. A large amount of amorphous carbon with low conductivity, which affects the capacity of the battery
For example, the material prepared by the method disclosed in the Chinese patent application No. 200410039176.4 has a high capacity when discharged at a low current density, but the capacity loss reaches about 20% when discharged at a high current density.

Method used

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  • A kind of preparation method of lithium ion secondary battery cathode material
  • A kind of preparation method of lithium ion secondary battery cathode material

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Embodiment 1

[0026] A method for preparing a positive electrode material for a lithium ion secondary battery provided in this embodiment includes the following steps:

[0027] In the first step, the LiFe 0.9 PO 4 and Fe(NO 3 ) 3 .9H 2 O is dissolved in water at a molar ratio of 10:1, so that Fe(NO 3 ) 3 .9H 2 O coating in LiFe 0.9 PO 4 surface, and then the mixture particles were obtained by spray drying.

[0028] In the second step, the mixture particles obtained in the first step and methanol were placed in a reaction vessel, ultrasonically dispersed at 300° C. for 1 hour, filtered, washed, and vacuum-dried for 5 hours to obtain carburized positive electrode active material powder.

[0029] In the third step, in an argon atmosphere, the positive electrode active material powder obtained in the second step is sintered at 700 ℃, so that Fe(NO 3 ) 3 .9H 2 O and LiFe 0.9 PO 4 phase fused into crystals to the LiFe 0.9 PO 4 The surface is covered with a graphene layer to obtain...

Embodiment 2

[0031] A method for preparing a positive electrode material for a lithium ion secondary battery provided in this embodiment includes the following steps:

[0032] In the first step, the LiFe 0.95 PO 4 and FeCl 3 .6H 2 O is dissolved in water in a molar ratio of 20:1, so that FeCl 3 .6H 2 O coating in LiFe 0.95 PO 4surface, and then the mixture particles were obtained by spray drying.

[0033] In the second step, the mixture particles and ethanol obtained in the first step were placed in a reaction vessel, ultrasonically dispersed at 400° C. for 3 hours, filtered, washed, and vacuum dried for 10 hours to obtain carburized positive electrode active material powder.

[0034] In the third step, in a nitrogen atmosphere, the positive electrode active material powder obtained in the second step is sintered at 800 °C to make FeCl 3 .6H 2 O and LiFe 0.95 PO 4 phase fused into crystals to the LiFe 0.95 PO 4 The surface is covered with a graphene layer to obtain a positive ...

Embodiment 3

[0036] A method for preparing a positive electrode material for a lithium ion secondary battery provided in this embodiment includes the following steps:

[0037] In the first step, the LiFe 0.99 PO 4 and Co (NO 3 ) 3 .6H 2 O is dissolved in water in a molar ratio of 100:1 so that Co(NO 3 ) 3 .6H 2 O coating in LiFe 0.99 PO 4 surface, and then the mixture particles were obtained by spray drying.

[0038] In the second step, the mixture particles and 1,2-butanediol obtained in the first step were placed in a reaction vessel, mechanically stirred and dispersed at 180°C for 20 hours, filtered, washed, and vacuum dried for 3 hours to obtain a carburized positive electrode active material powder.

[0039] In the third step, in a hydrogen atmosphere, the positive electrode active material powder obtained in the second step is sintered at 500 °C, so that Co(NO 3 ) 3 .6H 2 O and LiFe 0.99 PO 4 phase fused into crystals to the LiFe 0.99 PO 4 The surface is covered with...

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Abstract

The invention belongs to the technical field of lithium ion secondary batteries and particularly relates to a preparation method of a lithium ion secondary battery anode material. The preparation method of the lithium ion secondary battery anode material comprises the following steps of: firstly dissolving a non-stoichiometric anode active substance and a graphenization catalyst into water, then carrying out spray drying so as to obtain mixture granules; placing the mixture granules and an organic solvent into a reaction container, scattering, filtering, washing, and drying in vacuum, thus obtaining carburization anode active substance powder; sintering the anode active substance powder in an inert gas or reducing gas atmosphere so that the graphenization catalyst and the non-stoichiometric anode active substance are melted into crystals so as to coat a graphene layer on the surface of the anode active substance. Compared with the prior art, the preparation method has the advantages that the electron conduction property of the anode material is improved since the graphene layer with a high electron conduction property is coated on the surface of the anode active substance and further a battery made of the material has a excellent multiplying power performance and circulation performance and higher capacity.

Description

technical field [0001] The invention belongs to the technical field of lithium ion secondary batteries, and in particular relates to a preparation method of a positive electrode material for a lithium ion secondary battery with high conductivity. Background technique [0002] Lithium-ion secondary batteries have become one of the most widely used secondary batteries due to their advantages of high voltage and high energy density. With the continuous development of the miniaturization and long standby time of portable electronic devices, people have put forward higher and higher requirements on the energy density (especially the volume energy density) of lithium-ion batteries as the power source of portable electronic devices. [0003] Lithium iron phosphate (LiFePO) was first reported in 1997 by Padhi et al. 4 ) can reversibly intercalate and deintercalate lithium ions, and since LiFePO can be used as a cathode material for lithium ion batteries, LiFePO 4 It has attracted...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/48
CPCY02E60/10
Inventor 钟志勇陈刚郑迪东
Owner SHENZHEN BAINA NEW ENERGY TECH
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