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Preparation method of doped modified lithium iron phosphate

A lithium iron phosphate modification technology, which is applied in electrode manufacturing, electrical components, battery electrodes, etc., can solve the problems such as the difficulty in the industrial preparation of lithium iron phosphate as a positive electrode material for lithium ions, and achieve improved high-rate performance, growth inhibition, and purity high effect

Active Publication Date: 2012-02-01
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at problems such as the difficulty in industrial preparation of lithium iron phosphate, a lithium ion positive electrode material in the prior art, and provides a solid-phase sintering method for lithium iron phosphate, an iron doped lithium ion battery positive electrode material, so that it has higher charge and discharge capacity and good battery cycle performance

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  • Preparation method of doped modified lithium iron phosphate
  • Preparation method of doped modified lithium iron phosphate
  • Preparation method of doped modified lithium iron phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0032] First, mix 74.27g of lithium hydroxide monohydrate LiOH H2O, 133.22g of ferric oxide Fe2O3, 197.47g of ammonium dihydrogen phosphate, 40g of white sugar and 3.42g of magnesium oxide MgO into a sand mill at a concentration of 0.5 Wt% polyethylene glycol aqueous solution, the ratio of ball material to water is 2:1:2, high-speed ball milling (600rpm) for 5 hours; then the slurry after mixed sand milling is dried in a 100°C oven, then pulverized and processed Put it into a nitrogen atmosphere sintering furnace, under the protection of 10 liters / minute of high-purity nitrogen, raise the temperature to 750°C at a rate of 3°C / min, keep it warm for 6 hours, and then cool down to room temperature. After the sintered material is pulverized by a pulverizer, it is classified on a jet mill to obtain lithium iron phosphate with uniform particles. The carbon content in the material was measured to be 4.5%.

[0033] The measured tap density of the material is 1.3g / cm 3 .

[0034] Th...

Embodiment 2

[0042] First, 74.27g lithium hydroxide monohydrate LiOH·H 2 O, 133.22g ferric oxide Fe 2 o 3 , 197.47g ammonium dihydrogen phosphate, 20g carbon black and 6.55g trimanganese tetraoxide Mn 3 o 4 Mix and put into a sand mill, add AEO9 aqueous solution with a concentration of 1.0wt.%, add 1% ethanol anhydrous alcohol, and perform high-speed ball milling (600rpm) in a ball mill for 8 hours. Dry the mixed and sand-milled slurry in a 100°C oven, then pulverize it and put it into a nitrogen atmosphere sintering furnace. Under the protection of 10 liters / min of high-purity nitrogen, the temperature is raised to 750°C at a rate of 3.5°C / min. ℃ for 4 hours, and then cooled to room temperature. After the sintered material is crushed with a crusher, it is classified on a jet mill to obtain lithium iron phosphate with uniform particles.

[0043] The material obtained in Example 2 was sent to a lithium-ion battery factory to be prepared as an electrode sheet and assembled into a batter...

Embodiment 3

[0045] First, 74.27g lithium hydroxide monohydrate LiOH·H 2 O, 133.22g ferric oxide Fe 2 o 3 , 197.47g ammonium dihydrogen phosphate, 40g white granulated sugar and 6.37g cobalt oxide CoO are mixed and put into a sand mill, adding a concentration of 0.8wt.% AEO9 aqueous solution, and high-speed ball milling (700rpm) in a ball mill for 4 hours. Dry the mixed and sand-milled slurry in a 100°C oven, then pulverize it and put it into a nitrogen atmosphere sintering furnace. Under the protection of 10 liters / min of high-purity nitrogen, the temperature is raised to 750 at a rate of 5°C / min. ℃ for 6 hours, and then cooled to room temperature. After the sintered material is crushed with a pulverizer, it is classified on a jet mill to obtain lithium iron phosphate with uniform particles.

[0046] The carbon content of the active material was measured to be 5.12%. A simulated button battery was prepared according to the method of Example 1. After the battery was assembled, the rever...

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Abstract

The invention discloses a preparation method of modification doping lithium ferric phosphate, which comprises the following steps: under the condition of the existence of surfactant, mixing lithium compounds, ferric salt, phosphate salt, carbon precursor and dopant according to the proportion; milling the mixture; and then, processing the mixture by adopting a high-temperature solid phase method to obtain the lithium ferric phosphate material, the chemical formula of which is LiFe<x>M<1-x>PO4. In the invention, the surfactant is used as an auxiliary additive for uniformly dispersing the precursor in the water solution and carrying out carbonization in the solid phase reaction without influencing the purity of the material, and carbon is uniformly coated around the crystal, thereby improving the conductivity of the material and effectively inhibiting the growth of the crystal. Finally, the uniformly dispersed lithium ferric phosphate material of the nanometer grade is obtained.

Description

technical field [0001] The invention belongs to a preparation method of a lithium ion battery cathode material, in particular to a preparation method of doped modified lithium iron phosphate. Background technique [0002] Lithium-ion battery is a new type of green high-energy rechargeable battery that appeared in the early 1990s. It has a good voltage platform, excellent cycle stability and thermal stability, and low price. It is widely used in mobile phones, notebook computers, portable electric Tools, electronic instruments, etc., are one of the positive electrode materials with great potential. The positive electrode material is an important part of the lithium-ion battery. During the charging and discharging process of the lithium-ion battery, it not only provides the lithium required for reciprocating intercalation / extraction in the positive and negative lithium intercalation compounds, but also bears the SEI formed on the surface of the negative electrode material. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/04
CPCY02E60/12Y02E60/10
Inventor 俞晓峰包大新王国光金江剑徐君陆伟强
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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