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Method for preparing LiFePO4/C composite cathode material by continuous reaction

A composite cathode material, lithium hydroxide technology, used in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of low specific capacity, difficult material uniformity, and low tap density, etc. High density, good electrochemical performance, low cost effect

Inactive Publication Date: 2013-07-24
河南帝隆科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the commercial trial process of lithium iron phosphate, the main problems currently are: the uniformity of the material is still difficult to meet the general requirements of ten years of use, the tap density is small, and the specific capacity is low, etc.

Method used

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  • Method for preparing LiFePO4/C composite cathode material by continuous reaction
  • Method for preparing LiFePO4/C composite cathode material by continuous reaction
  • Method for preparing LiFePO4/C composite cathode material by continuous reaction

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Embodiment 1

[0020] Embodiment 1: A kind of continuous reaction prepares LiFePO 4 The method of / C composite positive electrode material is characterized in that: with iron filings, nitric acid, phosphoric acid, lithium hydroxide as raw material, carry out according to the following steps: first use 600 milliliters of 4.0 mol / liter dilute nitric acid solution (containing 2.4 moles of nitric acid) and 33.6 gram of iron filings (converted from the atomic weight of iron to 56 grams / mole to obtain 0.6 moles of iron) to react (the molar ratio of iron filings to dilute nitric acid is 1:4) to prepare ferric nitrate solution, and pass the hot reaction liquid through a filter Put into another reaction tank, then add 69 grams of 85% commercially available phosphoric acid in the reaction tank, under vigorous stirring, use the heating mantle to heat and reflux to react, lithium hydroxide, ferric phosphate dihydrate and carbon source are first wet Lithium ferrous phosphate double salt can be prepared b...

Embodiment 2

[0034] Embodiment 2: A kind of continuous reaction prepares LiFePO 4 The method of / C composite positive electrode material is characterized in that: with iron filings, nitric acid, phosphoric acid, lithium hydroxide as raw material, carry out according to the following steps: first use 600 milliliters of 3.0 mol / liter dilute nitric acid solution (containing 1.8 moles of nitric acid) and 25.2 gram of iron filings (converted from the atomic weight of iron of 56 g / mol to 0.45 moles of iron) to react (the molar ratio of iron filings to dilute nitric acid is 1:4) to prepare ferric nitrate solution, and pass the hot reaction solution through a filter Put into another reaction tank, then add 51.8 grams of 85% commercially available phosphoric acid in the reaction tank, under vigorous stirring, use the heating mantle to heat and reflux to react, lithium hydroxide, ferric phosphate dihydrate and carbon source are first wet Lithium ferrous phosphate double salt can be prepared by mixin...

Embodiment 3

[0048] Embodiment 3: A kind of continuous reaction prepares LiFePO 4 / C composite cathode material method, characterized in that: iron filings, nitric acid, phosphoric acid, lithium hydroxide as raw materials, according to the following steps: first use 600 milliliters of 2.0 mol / liter dilute nitric acid solution (containing 1.2 moles of nitric acid) and 16.8 gram of iron filings (converted from the atomic weight of iron to 56 grams / mole to obtain 0.3 moles of iron) to react (the molar ratio of iron filings to dilute nitric acid is 1:4) to prepare ferric nitrate solution, and pass the hot reaction liquid through a filter Put into another reaction tank, then add 34.6 grams of 85% commercially available phosphoric acid in the reaction tank, under vigorous stirring, use the heating mantle to heat and reflux to react, first wet lithium hydroxide, ferric phosphate dihydrate and carbon source Mixing materials by high-temperature carbon reduction to produce lithium iron phosphate dou...

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Abstract

The invention relates to a method for preparing a LiFePO4 / C composite cathode material by a continuous reaction with iron filings, nitric acid, phosphoric acid, lithium hydroxide as raw materials; the method comprises the following steps: allowing iron filings to react with nitric acid to obtain ferric nitrate, synthesizing low-cost ferric phosphate dihydrate by the prepared ferric nitrate solution and phosphoric acid in a reflux condition, performing wet mixing of lithium hydroxide, ferric phosphate dehydrate, and a carbon source, preparing lithium iron phosphate double salt by a high temperature carbothermal reduction method so as to obtain a submicron particle LiFePO4 / C composite material with nanometer microcrystal particles being uniformly coated by carbon and being bridged; the obtained material has high tap density, is uniform, has good conductivity and electrochemical performance, and has a simple preparation process, low cost, and stable product quality.

Description

technical field [0001] The invention belongs to the field of new energy materials, and relates to a continuous reaction of iron filings, nitric acid, phosphoric acid and lithium hydroxide as raw materials to prepare LiFePO 4 / C composite cathode material method. Background technique [0002] At present, lithium-ion secondary batteries have the advantages of high energy density, long cycle life, low self-discharge rate, no pollution, no memory effect, wide operating temperature range, small internal resistance, less pollution, and high cost performance, and are considered to be a new generation of green batteries. power supply. It has been widely used in many fields such as mobile phones, notebook computers, video cameras, digital cameras, electric vehicles, energy storage, and aerospace. [0003] Lithium-ion secondary batteries are mainly composed of positive electrode materials, separators, negative electrode materials and electrolytes. Among them, the positive electrode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/122Y02E60/10
Inventor 赵培正汤清虎赵培新赵全芳赵培真凌宁李文彬
Owner 河南帝隆科技发展有限公司