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Process for preparing iron site doped LiFePO4/C through spray drying method

A spray-drying, iron-doping technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of inability to meet requirements, resource shortages, and high costs

Inactive Publication Date: 2015-06-10
QINGDAO PINGDU JIUDIAN GOLD MINE
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Problems solved by technology

Traditional transition metal oxide cathode materials represented by LiCoO2 are constrained by problems such as high cost, shortage of resources, environmental pollution and insufficient safety. material of choice

Method used

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Embodiment Construction

[0009] Preparation of iron-doped LiFePO by a spray-drying method 4 / C process, which is characterized in that LiFe doped with variable valence transition metal Fe sites is prepared by spray drying 1-x m x PO4 / C (M=Ni, x=0.03) composite material, the sample prepared when the doping amount of Ni is 3% has the best electrochemical performance.

[0010] Specific process: doped LiFe 0.97 Ni 0.03 PO 4 / Preparation of C composite material: weigh 0.097 mol Fe(NO 3 ) 3 9H 2 O, 0.100mol (NH 4 ) 2 HPO 4 and 25.0 g glucose were dissolved in 40 mL deionized water to form a precursor solution; 0.03 mol of Ni(NO 3 ) 2 ·6H 2 O was completely dissolved by stirring to obtain a clear precursor solution I; weighed 0.100 mol LiOH·H 2 O was dissolved in 25 mL deionized water to form precursor solution II; under vigorous stirring conditions, precursor solution II was added to precursor solution I to obtain a precursor gel; concentrated ammonia water was added dropwise to the precursor g...

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Abstract

The present invention discloses a process for preparing iron site doped LiFePO4 / C through a spray drying method. The technical scheme comprises that a spray drying method is adopted to prepare a series of valence-variable transition metal Fe site doped LiFe1-xMxPO4 / C (M is Co, Mn, Ni, V, and Cu) composite materials, and the optimization process shows that the prepared sample has the best electrochemical performance when the doping amount of V or Ni is 3% so as to significantly improve the specific capacity of the material at the high rate and significantly improve the cycle stability of the material. The process of the present invention has the following characteristics that the bulk phase doping and the industrial scaling-up are easily achieved through the spray drying method, and the selected doped elements are the transition metals which are the non-noble metals, such that the high-performance doped LiFePO4 / C positive electrode material prepared by using the spray drying method has the great prospects.

Description

technical field [0001] The invention discloses a spray drying method for preparing iron-doped LiFePO 4 / C process. Background technique [0002] Lithium-ion batteries are favored for their many advantages and are currently the most advanced secondary batteries. Traditional transition metal oxide cathode materials represented by LiCoO2 are constrained by problems such as high cost, shortage of resources, environmental pollution and insufficient safety. Material of choice. LiFePO 4 Due to many advantages such as low cost, environmental friendliness, high safety, and good cycle performance, it has attracted much attention. In the past ten years, LiFePO 4 It is unanimously recognized as the most promising cathode material for lithium-ion batteries, especially the best choice for cathode materials for lithium-ion power batteries. However, LiFePO4 is used as a cathode material for power batteries, and its high rate performance and cycle stability are the most critical issues...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58
CPCY02E60/10
Inventor 马文超
Owner QINGDAO PINGDU JIUDIAN GOLD MINE
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