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Rare earth doped carbon clad type nanometer anode material iron lithium phosphate and its preparation method

A rare earth doping, cathode material technology, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of large cycle attenuation and limit the widespread use of lithium iron phosphate, and achieve long cycle life, low cost, simple craftsmanship

Inactive Publication Date: 2006-09-13
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difference in the type of rare earth doping and the composition and preparation process of carbon-coated materials, it has a great influence on the specific capacity and cycle attenuation of lithium iron phosphate, which limits the wide use of lithium iron phosphate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Weigh FeC separately 2 H 4 ·H 2 O: 53%wt, Li 2 CO 3 :11%wt, NH 4 H 2 PO 4 :35%wt, Y 2 O 3 : 1%wt for compounding.

[0019] (2) Perform dry ball milling and mixing of the prepared powder for 10 hours.

[0020] (3) Put the mixed material at 400℃, flow N 2 Calcined under atmosphere protection for 20 hours.

[0021] (4) Add the calcined material to 10wt% epoxy resin, and perform ball milling for 8 hours.

[0022] (5) Mix and dry the ground material at 100°C.

[0023] (6) Mix and dry the material at 1000kg / cm 2 Under pressure, press into a compact block;

[0024] (7) The pressed block is flowing N 2 Calcined at 600°C under the protection of the atmosphere and kept for 20 hours;

[0025] (8) The above-mentioned calcined material is crushed and classified to obtain rare earth doped carbon-coated nano LiFe 1-x M x PO 4 / C Powder.

Embodiment 2

[0027] (1) Weigh FeC separately 2 H 4 ·H 2 O: 52%wt, Li 2 CO 3 :11%wt, NH 4 H 2 PO 4 :35%wt, Y 2 O 3 : 2%wt for compounding.

[0028] (2) Dry ball milling and mixing of the prepared powder for more than 10 hours.

[0029] (3) Put the mixed material at 450℃, flow N 2 Calcined under atmosphere protection for 10 hours.

[0030] (4) The calcined material is added to 5wt% epoxy resin and ball milled for 8 hours.

[0031] (5) Mix and dry the ground material at 100°C.

[0032] (6) Mix and dry the material at 1500kg / cm 2 Under pressure, press into a compact block;

[0033] (7) The pressed block is flowing N 2 Calcined at 700°C under the protection of the atmosphere and kept for 15 hours;

[0034] (8) The above-mentioned calcined material is crushed and classified to obtain rare earth doped carbon-coated nano LiFe 1-x M x PO 4 / C Powder.

Embodiment 3

[0036] (1) Weigh FeC separately 2 H 4 ·H 2 O: 53%wt, Li 2 CO 3 :11%wt, NH 4 H 2 PO 4 :35%wt, CeO 2 : 1%wt for compounding.

[0037] (2) Dry ball milling and mixing of the prepared powder for more than 10 hours.

[0038] (3) Put the mixed material at 350℃, flow N 2 Calcined for 15 hours under atmosphere protection.

[0039] (4) The calcined material was added to 7wt% epoxy resin, and ball milled for 8 hours.

[0040] (5) Mix and dry the ground material at 100°C.

[0041] (6) Mix the dried material at 2000kg / cm 2 Under pressure, press into a compact block;

[0042] (7) The pressed block is flowing N 2 Calcined at 750°C under the protection of the atmosphere and kept for 10 hours;

[0043] (8) The above-mentioned calcined material is crushed and classified to obtain rare earth doped carbon-coated nano LiFe 1-x M x PO 4 / C Powder.

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Abstract

A carbon-coated RE-doped iron lithium phosphate nano-particle used for positive electrode of battery is prepared from FeC2H4, H2O, Li2CO3, NH4H2PO4, Y2O3, CeO2 and epoxy resin through proportional mixing, ball grinding, baking, sieving, calcining in N2 atmosphere at 350 deg.C and 600-750 deg.C respectively, and keeping the temp for a certain time.

Description

Technical field [0001] The invention relates to a rare earth doped carbon-coated nano LiFe for lithium ion batteries 1-x M x PO 4 / C cathode material and preparation method thereof belong to the technical field of battery material preparation. Background technique [0002] Rare earth doped carbon-coated nano-LiFe 1-x M x PO 4 The / C material is the most promising cathode material for lithium-ion batteries due to its good safety performance, environmental protection and long service life. The ionic and electronic conductivity of lithium iron phosphate materials is poor, so it is necessary to prepare rare-earth doped carbon-coated nano-LiFe through rare-earth doping and carbon coating on the particle surface 1-x M x PO 4 / C material. This can greatly improve the electrochemical performance of lithium iron phosphate battery materials. Due to the difference in rare earth doping species and carbon-coated material composition and preparation process, the specific capacity and cycle att...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 曾照强梁晓宁胡晓清杨尚权成龙胜
Owner TSINGHUA UNIV
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