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High-rate lithium iron phosphate positive electrode material and preparation method thereof

A technology of lithium iron phosphate and positive electrode materials, which is applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of low lithium ion transmission rate, complicated preparation process, and few lithium ion channels, so as to improve the rate and cycle performance, reducing side reactions, and improving charge and discharge capabilities

Inactive Publication Date: 2016-06-01
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the preparation of the rate-type lithium iron phosphate cathode material is mainly through the nanonization of the material to prepare a smaller particle size, but there are disadvantages such as poor processability and low compaction density, which have not fundamentally solved the problem of less lithium ion channels and lithium ion transmission. The problem of low speed seriously limits the popularization and use of its materials. For example, the patent CN101630730A (nano-lithium iron phosphate composite and its preparation method) prepares a particle size of 30 -500nm lithium iron phosphate cathode material, but its low gram capacity, poor processability and complex preparation process make it difficult to industrialize
In view of the current domestic deficiencies in the preparation of nano-lithium iron phosphate (only focus on the nano-size of the material particle size), and did not start with the modification of the material coating to improve the transmission rate of lithium ions in the material, that is, coating a Layer materials with high lithium ion conductivity to increase the charge and discharge rate of the material under high rate conditions. At present, there are few domestic researches on modification in this regard.

Method used

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  • High-rate lithium iron phosphate positive electrode material and preparation method thereof
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  • High-rate lithium iron phosphate positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] 1. Weigh 100g of nano-lithium iron phosphate with a particle size of 100nm, 10g of binder (content: 1g of polyacrylamide, 5g of polyvinyl alcohol, 1g of polyethylene glycol, 1g of polyethylene oxide, 1g of polyacrylic acid, polyvinylidene Vinyl fluoride 1g), 3.0g carbon nanotubes, and then added to 400g of NMP solvent, and stirred evenly by a high-speed disperser, and placed in a tube furnace, heated at a temperature of 350 ° C, crushed and classified Honeycomb nano-lithium iron phosphate A is obtained;

[0020] 2. Weigh 100g of lithium metaaluminate with a particle size of 100nm, 5g of binder (content: 0.5g of polyacrylamide, 2.5g of polyvinyl alcohol, 0.5g of polyethylene glycol, 0.5g of polyethylene oxide, polyacrylic acid 0.5g, polyvinylidene fluoride 0.5g), 3g hollow carbon spheres, 20g sucrose, added to 500 parts of NMP solvent, and stirred evenly by a high-speed disperser to obtain a solution B with a viscosity of 3000mpa s;

[0021] 3. Weigh 100g of honeycomb n...

Embodiment 2

[0023] 1. Weigh 10g of nano-lithium iron phosphate with a particle size of 10nm, 1g of binder (content: 0.05g of polyacrylamide, 0.5g of polyvinyl alcohol, 0.05g of polyethylene glycol, 0.1g of polyethylene oxide, polyacrylic acid 0.2g, polyvinylidene fluoride 0.1g), 1.0g carbon nanotubes, added to 300g of NMP solvent, and stirred evenly by a high-speed disperser, and placed in a tube furnace, heated at a temperature of 300°C , through crushing and grading to obtain honeycomb nano-lithium iron phosphate A;

[0024] 2. Weigh 100g of lithium metaaluminate with a particle size of 50nm, 1g of binder (content: 0.05g of polyacrylamide, 0.5g of polyvinyl alcohol, 0.05g of polyethylene glycol, 0.1g of polyethylene oxide, polyacrylic acid 0.2g, 0.1g of polyvinylidene fluoride), 1g of hollow carbon spheres, and 10g of sucrose were added to 200 parts of NMP solvent, and stirred evenly by a high-speed disperser to obtain solution B with a viscosity of 2000mpa·s;

[0025] 2. Weigh 100g of...

Embodiment 3

[0027] 1. Weigh 10g of nano-lithium iron phosphate with a particle size of 200nm, 10g of binder (content: 1.5g of polyacrylamide, 5.5g of polyvinyl alcohol, 0.5g of polyethylene glycol, 0.5g of polyethylene oxide, polyacrylic acid 1g, polyvinylidene fluoride 1g), 1.0g carbon nanotubes, added to 500g of NMP solvent, and stirred evenly by a high-speed disperser, and placed in a tube furnace, heated at a temperature of 500 ° C, and then Honeycomb nano-lithium iron phosphate A is obtained by crushing and grading;

[0028] 2. Weigh 100g of lithium metaaluminate with a particle size of 200nm, 10g of binder (content: 1.5g of polyacrylamide, 5.5g of polyvinyl alcohol, 0.5g of polyethylene glycol, 0.5g of polyethylene oxide, polyacrylic acid 1g, polyvinylidene fluoride 1g), 5g hollow carbon spheres, 30g sucrose, then added to 800 parts of NMP solvent, and stirred evenly by a high-speed disperser to obtain a solution B with a viscosity of 10000mpa s;

[0029] 3. Weigh 100g of honeycomb...

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Abstract

The invention relates to a high-rate lithium iron phosphate positive electrode material and a preparation method thereof. The positive electrode material is of a shell-core structure, the core is provided with honeycomb nanometer lithium iron phosphate, and the shell is provided with a lithium aluminate cladding layer. The positive electrode material depends on the advantages of small grain size of the nano-scale lithium iron phosphate and the advantages of high conductivity of lithium ions in lithium aluminate, and the transmission rate of the lithium ions in the material is increased; meanwhile, with the advantages of nanopores reserved in the core after sintering of a binding agent and large specific area of a carbon nanotube in the core and hollow carbon spheres in the shell, the capability of liquid absorption and preservation of the material can be substantially improved, an enough electrolyte is provided for a battery during the high-rate charging and discharging process, and the rate performance of the lithium iron phosphate is finally improved.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion secondary battery materials, and specifically prepares a high-rate lithium iron phosphate cathode material through material modification and coating. Background technique [0002] Olivine-structured lithium iron phosphate (LiFePO 4 ) is considered to be a new lithium-ion battery cathode material with broad application prospects due to its abundant raw material sources, low price, good thermal stability, and excellent cycle performance, and is used in power batteries or energy storage batteries. As people's demand for fast charging of electric vehicles and mobile phones increases, lithium-ion batteries are required to have higher rate performance to meet the needs of electric vehicles, power tools and other fields. [0003] At present, the preparation of the rate-type lithium iron phosphate cathode material is mainly through the nanonization of the material to prepare a smaller particle s...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B25/45H01M4/62
CPCC01B25/45H01M4/5805H01M4/622Y02E60/10
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC