Lithium iron phosphate material wrapped by fluorine-doped tin oxide and preparation method of lithium iron phosphate material

A fluorine-doped tin oxide and coating technology is applied in the field of positive electrode materials for lithium ion batteries, which can solve the problems of poor cycle rate performance and capacity density, low tap density, and poor conductivity of composite materials, and achieve improved cycle performance and Rate performance, low cost, and the effect of improving rate performance

Active Publication Date: 2012-07-25
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The first object of the present invention is to use novel conductive agent fluorine-doped tin oxide (FTO) as lithium iron phosphate (LiFePO 4 ) coating material, providing a FTO / LiFePO 4 Composite materials are used as cathode materials for lithium-ion batteries to overcome the existing lithium-ion cathode materials LiFePO 4 Composite materials have poor electrical conductivity and low tap density, which solves the existing LiFePO 4 Problems of poor cycle rate performance and capacity density of composite materials

Method used

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  • Lithium iron phosphate material wrapped by fluorine-doped tin oxide and preparation method of lithium iron phosphate material
  • Lithium iron phosphate material wrapped by fluorine-doped tin oxide and preparation method of lithium iron phosphate material
  • Lithium iron phosphate material wrapped by fluorine-doped tin oxide and preparation method of lithium iron phosphate material

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Embodiment 1

[0023] Weigh 0.019g ammonium fluoride (NH 4 F) and 0.609g tin tetrachloride pentahydrate (SnCl 4 ·5H 2 (2), be dissolved in 20mL acetone to form a solution; the solution obtained is fully mixed with 10g ferrous oxalate, 6.356g ammonium dihydrogen phosphate and 2.144g lithium carbonate, and dried to obtain a mixed material; the mixed material is heated in an argon atmosphere , react at 550° C. for 10 hours, and then cool with the furnace to obtain a reaction product; grind the reaction product to obtain a fluorine-doped tin oxide (FTO) / lithium iron phosphate composite material for a positive electrode of a lithium ion battery.

[0024] The fluorine-doped tin oxide (FTO) / lithium iron phosphate composite material obtained for the positive electrode of lithium-ion batteries was observed by transmission electron microscopy, and the results were as follows: figure 1 shown. From figure 1 It can be seen that the thickness of the FTO coating layer in the obtained FTO-coated lithium...

Embodiment 2

[0027] Weigh 0.021g hydrofluoric acid (HF) and 0.715g tin oxychloride (SnOCl 2 ), dissolved in 25mL ethanol to form a solution; the obtained solution was fully mixed with 8.877g ferrous oxalate, 14.595g ammonium dihydrogen phosphate and 2.752g lithium hydroxide, and dried to obtain a mixed material; atmosphere, react at 600°C for 9 hours, and then cool with the furnace to obtain the reaction product; grind the reaction product to obtain the fluorine-doped tin oxide (FTO) / lithium iron phosphate composite material for the positive electrode of lithium-ion batteries.

Embodiment 3

[0029] Weigh 0.059g ammonium fluoride (NH 4 F) and 1.835g tin tetrachloride pentahydrate (SnCl 4 ·5H 2 O), be dissolved in 50mL acetone, form a solution; The solution obtained is mixed with 38.84g ferric oxalate, 16.247g phosphoric acid and 17.619g lithium acetate dihydrate (CH 3 COOLi·2H 2 O) fully mixed and dried to obtain the mixed material; the mixed material was reacted in a nitrogen atmosphere at 550°C for 7 hours, and then cooled with the furnace to obtain a reaction product; the reaction product was ground to obtain a lithium-ion battery positive electrode with fluorine-doped oxidation Tin (FTO) / lithium iron phosphate composite.

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Abstract

The invention discloses a lithium iron phosphate material wrapped by fluorine-doped tin oxide and a preparation method of the lithium iron phosphate material. The preparation method includes dissolving polymer of a fluorine source and a tin source in organic liquor according to the molar ratio of F:Sn ranging from 0.3 to 1; adding polymer of an iron source, a phosphorus source and a lithium source, and sufficiently mixing the polymer of the iron source, the phosphorus source and the lithium source with the polymer of the fluorine source and the tin source; and drying mixed materials, leading the mixed materials to react in inertia atmosphere at the temperature ranging from 550 DEG C to 700 DEG C for 5 to 10 hours, cooling and grinding the reacted mixed materials to obtain the fluorine-doped tin oxide and lithium iron phosphate composite material for an anode of a lithium ion battery. The molar ratio of P:Fe:Li:Sn of the elements is 1:1:X:Y, wherein the X is larger than or equal to 1.02 and smaller than or equal to 1.10, and the Y is larger than or equal to 0.005 and smaller than or equal to 0.05. The fluorine-doped tin oxide is wrapped on the surface of the lithium iron phosphate material, accordingly, conductivity of the lithium iron phosphate material is improved, the rate capacity is enhanced, electrolyte is prevented from dissolving and corroding internal active substances, and stability and safety of the material during rate and circulation are enhanced.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to lithium iron phosphate materials coated with fluorine-doped tin oxide (FTO), a novel conductive agent used as positive electrode materials for lithium ion batteries, and a preparation method thereof. Background technique [0002] In 1997, Padhi (Padhi AK, Nanjundaswamy KS and Goodenough JB, J. Electrochem. Soc. 1997, 144: 1188-1194) first reported lithium iron phosphate (LiFePO 4 ) can reversibly intercalate and deintercalate lithium ions, which can be used as cathode materials for lithium-ion batteries. At the same time, the large amount and wide distribution of iron in nature makes LiFePO 4 Low cost, environmentally friendly, non-toxic and harmless, so after nearly two decades of development, LiFePO 4 It has been developed into one of the most promising lithium-ion battery materials at present. Especially in recent y...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 张卫东周恒辉汪晓雅陈继涛
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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