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Anode material for lithium ion battery and preparation method of anode material

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as environmental pollution, increase in production costs, low electronic conductivity and ion conductivity, and achieve high initial discharge specific capacity , good rate performance, and the effect of increasing the preparation cost

Inactive Publication Date: 2014-06-25
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

LiFePO 4 Due to its low price, stable performance, and environmental protection and non-toxicity, it was once considered the most promising lithium-ion battery, especially the ideal positive electrode material for power batteries, but it has low electronic conductivity and ionic conductivity, which requires its own research. Carbon encapsulation or particle nanosizing has been further improved, recently by the Tarascon J-M research group by introducing fluorine atoms [SO 4 F] 3- Instead of [PO 4 ] 3- Successfully prepared a new type of fluorinated polyanionic cathode material LiFeSO 4 F, showing higher than LiFePO 4 The voltage platform, better lithium ion transport kinetics and high ion conductivity make this material achieve high rate performance without nanonization, but LiFeSO 4 F is unstable in water, easy to decompose, and cannot be prepared by low-temperature aqueous solution process. The commonly used preparation method is the ionothermal method by introducing ionic liquid as the reaction medium, which is easy to cause environmental pollution and increase the preparation cost.

Method used

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  • Anode material for lithium ion battery and preparation method of anode material
  • Anode material for lithium ion battery and preparation method of anode material
  • Anode material for lithium ion battery and preparation method of anode material

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Embodiment 1

[0018] Embodiment 1, the precursor FeSO 4 7H 2 O (99.9%) and LiF (99.9%) were put into a zirconia ball mill jar at a molar ratio of 1:1.2 together with absolute ethanol (amount to submerge the ball milling beads and abrasives) for high-energy ball milling. After 24 h of ball milling, the mixture was placed Dry in a vacuum oven at 60°C for 24 h. After the alcohol is completely volatilized, grind the mixture into a fine powder by hand in an agate mortar, then compact it into a disc, and put it in a ceramic boat at 380°C under the protection of inert gas nitrogen. Lithium fluoroferric sulfate (LiFeSO 4 F) Cathode material, such as figure 1 is the X-ray diffraction pattern of the prepared cathode material, figure 2 is the SEM image of the as-prepared cathode material.

Embodiment 2

[0019] Embodiment 2, the precursor FeSO 4 7H 2 O (99.9%) and LiF (99.9%) were put into a zirconia ball mill jar at a molar ratio of 1:1 together with absolute ethanol (amount to submerge the ball milling beads and abrasives) for high-energy ball milling. After 24 h of ball milling, the mixture was placed Dry in a vacuum drying oven at 60°C for 24 h. After the alcohol is completely volatilized, the mixture is manually ground into a fine powder in an agate mortar, then compacted into a disc, and placed in a ceramic boat at 380°C under the protection of an inert gas argon. Lithium fluoroiron sulfate (LiFeSO 4 F) Cathode material, such as image 3 is the X-ray photoelectron energy spectrum of the prepared lithium iron sulfate fluoride.

Embodiment 3

[0020] Embodiment 3, the precursor FeSO 4 7H 2 O (99.9%) and LiF (99.9%) were put into a zirconia ball mill pot for high-energy ball milling at a molar ratio of 1:1.2 together with absolute ethanol (amount to submerge ball milling beads and abrasives). After 24 hours of ball milling, the The mixture was dried in a vacuum drying oven at 60°C for 24 hours. After the alcohol was completely volatilized, the mixture was manually ground into a fine powder in an agate mortar, then compacted into discs, and placed in a ceramic boat at 380°C under the protection of inert gas nitrogen. Lithium fluoroiron sulfate (LiFeSO 4 F) Cathode material; The LiFeSO that will make 4 Grind the positive electrode active material until the particle size is less than 7 μm, sieve, weigh the active material, acetylene black, and binder PVDF according to the ratio of mass 8:1:1, add NMP, stir at 80°C for 4 h, and prepare Electrode paste, coated on clean aluminum foil and cut into 0.8×0.8 cm 2 The elect...

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Abstract

The invention relates to an anode material for a lithium ion battery and a preparation method of the anode material. The anode material is fluoro lithium ferric sulfate which is obtained by performing solid-phase reaction on a precursor FeSO4.7H2O and LiF after being ball-milled and mixed. The preparation method of the anode material particularly comprises the following steps: putting the precursor and absolute ethyl alcohol in a zirconium oxide ball-milling tank for high energy ball milling to obtain a mixture; after milling for 24 hours, putting the mixture in a vacuum drying box to be dried for 24 hours at 60 DEG C; after alcohol is fully volatilized, manually grinding the mixture to fine powder in an agate mortar; then compacting to a round tablet; and putting in a ceramic boat and performing solid phase sintering under protection of a reducing atmosphere or inertial gas at 350-380 DEG C to prepare the fluoro lithium ferric sulfate anode material. The anode material has the characteristics of high capacity, good stability and high open-circuit voltage. The fluoro lithium ferric sulfate prepared by adopting the method is taken as an active material of the anode to prepare the lithium ion battery. The lithium ion battery has the relatively great first-time specific discharge capacity and the good rate capability.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Due to its high energy, environmental protection, long life and other advantages, lithium-ion batteries have received widespread attention. The impact of positive electrode materials on the overall performance of lithium-ion batteries is very important! Common cathode materials are lithium cobalt oxide LiCoO 2 , lithium manganese oxide LiMn 2 o 4 , lithium iron phosphate LiFePO 4 , and doped, clad, or low-dimensionalized forms of these materials. LiFePO 4 Due to its low price, stable performance, and environmental protection and non-toxicity, it was once considered the most promising lithium-ion battery, especially the ideal positive electrode material for power batteries, but it has low electronic conductivity and ionic conductivity, which require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCC01G49/14H01M4/5825H01M10/0525Y02E60/10
Inventor 黄延伟张国彬
Owner HANGZHOU DIANZI UNIV
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