Vanadium-titanium ion-codoped lithium iron phosphate material and preparation method thereof

A lithium iron phosphate, vanadium ion technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problem of difficult to improve the rate performance and specific capacity of lithium iron phosphate at the same time, can not well meet the requirements of lithium ion power batteries, phosphoric acid. The effect of iron and lithium ion conductivity is not obvious, and the effect of superior rate discharge performance, superior cycle stability and superior electrochemical performance is achieved.

Inactive Publication Date: 2013-05-01
ZHEJIANG NARADA POWER SOURCE CO LTD +2
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. Although titanium doping can effectively improve the rate performance of lithium iron phosphate, the increase of titanium ions will also form impurities with low electrochemical activity such as LiTi 2 (PO 4 ) 3 and Ti 2 P 2 o 7 , which in turn affects the specific energy and specific power of the battery, which still cannot meet the requirements of lithium-ion power batteries
[0008] 2. Although vanadium doping can effectively increase the discharge potential of lithium iron phosphate, it has no obvious effect on improving the ion conductivity of lithium iron phosphate, and cannot well meet the requirements of lithium-ion power batteries.
[0009] 3. Single titanium doping or single vanadium doping is difficult to achieve the purpose of improving the rate performance and specific capacity of lithium iron phosphate at the same time, thus limiting its application in medium and high-power electrical equipment

Method used

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  • Vanadium-titanium ion-codoped lithium iron phosphate material and preparation method thereof
  • Vanadium-titanium ion-codoped lithium iron phosphate material and preparation method thereof
  • Vanadium-titanium ion-codoped lithium iron phosphate material and preparation method thereof

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Effect test

Embodiment 1

[0035] The preparation steps are as follows: lithium carbonate, ferrous oxalate, ammonium dihydrogen phosphate, ammonium metavanadate and titanium dioxide are mixed according to the molar ratio of Li + : Fe 2+ : Ti 4+ :V 5+ :PO 4 3- =1.00: 0.975: 0.005: 0.02: 1.00 Weighing, adding glucose according to 35% of the mass of lithium carbonate, and then adding absolute ethanol according to 80% of the total mass of the reactant material, and ball milling for 4 hours to obtain a uniformly mixed slurry. Then it was placed in a tube furnace protected by a nitrogen atmosphere, and the temperature was raised to 400 °C at a heating rate of 2 °C / min for pre-sintering, and the temperature was kept for 4 hours; Hour. Naturally cool down to room temperature with the furnace to get titanium and vanadium ion co-doped lithium iron phosphate material, the molecular formula is LiFe 1-x-y Ti x V y (PO 4 ) / C, where x=0.005, y=0.02.

[0036] In order to compare needs, titanium-doped lithium...

Embodiment 2

[0040] The preparation steps are as follows: lithium oxalate, iron oxide, diammonium hydrogen phosphate, ammonium metavanadate and tetramethyl titanate are mixed according to the molar ratio of Li + : Fe 3+ : Ti 4+ :V 5+ :PO 4 3- =1.00:0.98:0.01:0.01:1 Weighing, add glucose according to 30% of the mass of lithium oxalate, then add absolute ethanol according to 80% of the total mass of reactant materials, and ball mill and mix for 6 hours to obtain a uniformly mixed slurry. Then it was placed in a tube furnace protected by a nitrogen atmosphere, and the temperature was raised to 400 °C at a heating rate of 2 °C / min for pre-sintering, and the temperature was kept for 4 hours; Hour. Naturally cool down to room temperature with the furnace to get titanium and vanadium ion co-doped lithium iron phosphate material, the molecular formula is LiFe 1-x-y Ti x V y (PO 4 ) / C, where x=0.01, y=0.01.

[0041] The lithium iron phosphate material co-doped with titanium and vanadium ...

Embodiment 3

[0043] The preparation steps are as follows: lithium oxalate, ferrous acetate, ammonium phosphate, vanadium pentoxide and titanium dioxide are mixed according to the molar ratio of Li + : Fe 2+ : Ti 4+ :V 5+ :PO 4 3- =1.00:0.97:0.01:0.02:1.00 Weighing, adding sucrose according to 40% of the mass of lithium oxalate, and then adding acetone according to 90% of the total mass of the reactant material, ball milling and mixing for 6 hours to obtain a uniform slurry, and then It is placed in a tube furnace protected by a nitrogen atmosphere, and the temperature is raised to 350°C at a rate of 2°C / min for pre-sintering, and the temperature is kept for 6 hours; then the temperature is raised to 720°C for calcination at a rate of 2°C / min, and the temperature is kept for 8 hours. Naturally cool down to room temperature with the furnace to get titanium and vanadium ion co-doped lithium iron phosphate material, the molecular formula is LiFe 1-x-y Ti x V y (PO 4 ) / C, where x=0.01,...

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Abstract

The invention provides a vanadium-titanium ion-codoped lithium iron phosphate (LiFePO4) material and a preparation method thereof. The preparation method comprises the following steps: weighing a lithium source, an iron source, a phosphorus source and a dopant according to the ionic molar ratio of Li<+>, iron ion, Ti<4+>, V<5+> and PO4<3-> as 1: (1-x-y): x: y: 1, adding a carbon source and a mixing medium, mixing uniformly by liquid-phase ball milling, placing in a nitrogen or argon atmosphere, heating up to 350-450 DEG C for pre-sintering, performing heat preservation for 4-6 hours, heating up to 650-750 DEG C for calcination, and performing heat preservation for 8-12 hours; and cooling to room temperature, and grinding to obtain the vanadium-titanium ion-codoped LiFePO4 material that has a general formula of LiFe1-x-yTixVy(PO4) / C, wherein x is smaller than or equal to 0.01 and larger than or equal to 0.005; y is smaller than or equal to 0.02 and larger than or equal to 0.005; and x+y is smaller than or equal to 0.03 and larger than or equal to 0.01. According to the invention, the vanadium-titanium ion-codoped LiFePO4 material has higher discharge specific capacity as well as preferable rate discharge performance and cycle stability, and is perfect in crystallization and smaller in particle size. The preparation method is simple in process and low in energy consumption; and the obtained material is superior in electrochemical performance, strong in controllability, and convenient for industrial mass production.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a lithium iron phosphate material co-doped with vanadium and titanium ions and a preparation method thereof. The material can be used in lithium-ion batteries, and has potential application value in high-capacity and high-power batteries for electric vehicles. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific capacity, long charge and discharge life, no memory effect, less environmental pollution, fast charging, and low self-discharge rate. At present, lithium-ion batteries are used in mobile phones, notebook computers, digital cameras, and portable small electrical appliances, and batteries used in submarines, aerospace, and aviation fields, and are gradually moving towards the field of electric vehicle power. As human society is facing more and more severe energy and environmental problems, lithium-ion batteries,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 姜应律钟雅文杨国凯陈蕾蔡若愚
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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