Method for synthesizing lithium ion battery anode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of Li-ion volatilization, high energy consumption, poor product shape consistency, which is not conducive to post-processing of materials, etc., to achieve The effect of improving lithium ion transmission efficiency, shortening ion transmission path, and uniform product particle size distribution

Inactive Publication Date: 2011-02-16
IRICO
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, industrial production mostly uses high-temperature solid-phase method to synthesize lithium ferrous phosphate. This process route is simple and easy to operate and has been widely used in industrial production. However, there are problems that cannot be solved by high-temperature solid-phase method itself in material synthesis: 1. Raw materials are mixed mechanically, Insufficient mixing of components and poor product consistency
2. The holding time is too long, the energy consumption is large, and Li ions are volatile during the long-term holding process, which is not conducive to controlling the proportion of components
3. The poor shape consistency of the obtained product is not conducive to the post-processing of the material
4. Excessive reliance on mechanical grinding during mixing and sample post-processing is easy to introduce impurities
The above problems lead to poor batch stability of lithium iron phosphate in current industrial production, which is not conducive to large-scale industrial production

Method used

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  • Method for synthesizing lithium ion battery anode material
  • Method for synthesizing lithium ion battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] With Fe(NO 3 ) 2 ·6H 2 O, LiOH·H 2 O, H 3 PO 4 as raw material, Li 1+x FePO 4 (x=0) The ratio of the amount of each component substance Li:Fe:P=1:1:1. Dissolve the above reagents in deionized water to obtain a transparent homogeneous solution, mix the above solutions evenly and add polyethylene glycol alcohol solution as a network binder, wherein the concentration of polyethylene glycol alcohol solution is 0.1 mol / L. Then the above mixed solution is spray-dried, and the temperature of the feed inlet is kept at 185° C. 2 / H 2 =9:1 (volume ratio) sintering at 750°C for 2 hours in an atmosphere, cooling and taking out to obtain LiFePO with concentrated particle size distribution 4 materials (if attached figure 1 shown), the primary particle diameter is below 20nm (as attached figure 2 shown) and the particle size distribution has good consistency.

Embodiment 2

[0025] With Fe(NO 3 ) 2 ·6H 2 O, LiOH·H 2 O, H 3 PO 4 as raw material, Li 1+x FePO 4 (x=0.05) The ratio of the amount of each component substance Li:Fe:P=1.05:1:1. Dissolve the above reagents in deionized water to obtain a transparent homogeneous solution, mix the above solutions evenly and add polyvinyl alcohol alcohol solution as a network binder, wherein the concentration of polyvinyl alcohol alcohol solution is 0.5 mol / liter. The above-mentioned mixed solution is then spray-dried, and the temperature of the feed inlet is kept at 165° C. 2 Sinter at 650°C for 5 hours in the atmosphere, and then take out after cooling to obtain Li with concentrated particle size distribution. 1.05 FePO 4 Materials, the primary particle diameter is below 20nm and the particle size distribution has good consistency.

Embodiment 3

[0027] With Fe(NO 3 ) 2 ·6H 2 O, LiC 2 h 3 o 2 2H 2 O, H 3 PO 4 as raw material, Li 1+x FePO 4 (x=0.1) The ratio of the amount of each component substance Li:Fe:P=1.1:1:1. Dissolve the above reagents in deionized water to obtain a transparent homogeneous solution, mix the above solutions evenly and add polyvinyl alcohol alcohol solution as a network binder, wherein the concentration of polyvinyl alcohol alcohol solution is 0.7 mol / liter. Then the above mixed solution was spray-dried, and the temperature of the feed port was kept at 180°C. The dried product was sintered at 550°C for 10 hours in a high-purity Ar atmosphere, and then cooled and taken out to obtain Li with a concentrated particle size distribution. 1.1 FePO 4 Materials, the primary particle diameter is below 20nm and the particle size distribution has good consistency.

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Abstract

The invention provides a new method for synthesizing a lithium ion battery anode material Li1+xFePO4. The method is characterized in that the chemical composition of the prepared anode material meets Li1+xFePO4, wherein x is not less than 0 and not more than 0.2. The specific embodiment comprises the steps of dissolving the soluble compound containing Li<+>, Fe<2+> and PO4<3-> in deionized water according to the stoichiometric ratio of the molecular formula, evenly mixing the solution and adding an alcoholic solution of organic macromolecules as the network binding agent, drying and pelletingthe mixed liquid by the spray drying method to obtain a Li1+xFePO4 precursor and placing the precursor in a sintering furnace for high-temperature sintering under the protection atmosphere. The chemical components of the Li1+xFePO4 anode material prepared by the method have good consistency, the size distribution is centralized and the particle diameter is nanometer level. The invention effectively shortens the ion transmission path, improves the lithium ion transmission efficiency and is beneficial to high-power charge and discharge.

Description

technical field [0001] The invention belongs to the field of preparation technology of energy materials, and relates to a method for synthesizing positive electrode materials of lithium ion batteries. Background technique [0002] In 1997, A.K.Padhi first reported lithium iron phosphate (LiFePO 4 ) has the function of deintercalating lithium. Because of its high energy density, low price, and excellent safety, it is considered by the industry to be the most likely cathode material for EV batteries. At present, industrial production mostly uses high-temperature solid-phase method to synthesize lithium ferrous phosphate. This process route is simple and easy to operate and has been widely used in industrial production. However, there are problems that cannot be solved by high-temperature solid-phase method itself in material synthesis: 1. Raw materials are mixed mechanically, Insufficient mixing of components and poor product consistency. 2. The holding time is too long, the...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M4/1397C01B25/45H01M4/58
CPCY02E60/122Y02E60/10
Inventor赵金鑫
OwnerIRICO