Method for producing electrode material with ferrophosphorus

A technology for preparing electrodes and electrode materials, which is applied in the field of materials and electrochemistry, can solve the problems of single raw materials, high preparation costs, shorten the production process of electrode materials, etc., achieve the effects of improving utilization rate, simplifying the preparation process, and having practical effects

Active Publication Date: 2008-07-16
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the common coexistence shortcomings of single raw material and high preparation cost of current electrode materials, start from raw materials, synthesis routes and processes, use cheap and easy-to-obtain ferrophosphorus as raw materials, shorten the pro

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  • Method for producing electrode material with ferrophosphorus

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Embodiment 1

[0025] Preparation of LiFePO from FeP by Reaction Pulverization 4 For the positive electrode material, phosphorus iron is used as phosphorus source and iron source, and LiOH is used as lithium source. Roasting in the furnace for 0.5-10h, controlling a certain air flow, using the oxygen in the air as the oxygen source, and using N 2 or CO burned with C 2 For inert protective gas, get black LiFePO 4 Electrode material, the reaction equation is as follows:

[0026] 4FeP+4LiOH+7O 2 →4LiFePO 4 +2H 2 O

[0027] According to the needs, not only can the material be modified differently by using impurity elements such as Al and V in ferrophosphorus, but also LiFePO can be formed with the raw material. 4 / FeP composite electrode material, using the high conductivity of FeP to improve LiFePO 4 In addition, LiFePO can also be formed by adding different carbon or carbon-containing compounds to the precursors. 4 / C composite electrode material.

Embodiment 2

[0029] Ferrophosphorus FeP, a by-product of a yellow phosphorus production plant, using the rheological phase method 2 Preparation of LiFePO as raw material 4 Cathode material, using phosphorus iron as phosphorus source and iron source, using Li 2 CO 3 For lithium source, add a certain amount of NH 4 H 2 PO 4 Supplement the phosphorus source, the ratio of the three substances is 1:1:1.08, use ethanol as the solvent, and after sufficient ball milling or grinding to form a rheological phase, put it into a controlled atmosphere tube furnace at 200 ~ 700 ° C for roasting for 2 ~ 25h, control a certain air flow, use the oxygen in the air as the oxygen source, and use N 2 or CO burned with C 2 For inert protective gas, get black LiFePO 4 Electrode material, the reaction equation is as follows:

[0030] 4Fe 2 P+4NH 4 H 2 PO 4 +4Li 2 CO 3 +9O 2 →8LiFePO 4 +6H 2 O+4NH 3 +4CO 2

[0031] According to the needs, not only can the impurity elements such as Si, Al, and Ca...

Embodiment 3

[0033] Fe by-product of calcium magnesium phosphate fertilizer production plant by spray drying 1.5 Preparation of LiFePO using P as raw material 4 For cathode material, firstly, ferrophosphorus is pulverized to a certain particle size by jet mill, using ferrophosphorus as phosphorus source and iron source, and using LiH 2 PO 4 LiOH and LiOH are the lithium source, and the ratio of the three substances is 2:1:2.08. After the precursor is spray-dried, it is placed in a controlled atmosphere furnace at 200 to 900 ° C, and N 2 or CO burned with C 2 For inert protective gas, get black LiFePO 4 Electrode material, the reaction equation is as follows:

[0034] 2Fe 1.5 P+LiH 2 PO 4 +2LiOH+4O 2 →3LiFePO 4 +2H 2 O

[0035] According to the needs, not only can the impurity elements such as Ni, V, Ca in the ferrophosphorus be used to modify the material differently, but also LiFePO can be formed with the raw material. 4 / Fe 1.5 P composite electrode material, using Fe 1.5 H...

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Abstract

The invention relates to a method for applying ferro phosphorus to manufacture electrode material with low cost, belonging to a material and electrochemical field. The ferro phosphorus at least comprises P and Fe elements at the same time, thus providing part or all sources of phosphorus and ferro for the electrode material; the ferro phosphorus can be mineral, the smelt products thereof, byproducts of phosphorus chemical industry or silicate chemical industry, or self-made. Compared with the prior art, the method has rich source, low cost, simple manufacture method and process, short production flow; the impurity elements inside the material can be used for carrying out in-situ self-doping modification the invention can effectively increase cycling efficiency and utilization rate of resources, and reduce electrode material cost from the source; the invention is practical and easy for large-scale industrial clean production to realize consumption reduction, energy conservation and comprehensive utilization of resources.

Description

technical field [0001] The invention relates to a method for preparing electrode materials from ferrophosphorus, especially a method for low-cost electrode materials, and belongs to the fields of materials and electrochemistry. Background technique [0002] With the rapid development of economy and society, people are more and more dependent on energy, while traditional fossil fuels are increasingly depleted and people's awareness of environmental protection is gradually increasing. attaches great importance to it, and has invested a lot of manpower and material resources in research, competing to develop new energy represented by electric vehicles, power tools and large energy storage devices. At present, electrode materials are a key bottleneck hindering the rapid development of this type of energy, and material prices are undoubtedly a fatal factor limiting their large-scale applications. Electrode materials containing both P and Fe elements, especially Li x Fe y PO 4...

Claims

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Application Information

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IPC IPC(8): C01B25/45C01B25/08H01M4/58
CPCY02E60/10
Inventor 王贵欣闫康平
Owner SICHUAN UNIV
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