Lithium iron phosphate composite material with high compaction density and method for preparing lithium iron phosphate composite material

A technology of lithium iron phosphate and composite materials, applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of low compaction density, high compaction density of composite materials, poor rate performance, etc., and achieve improved compaction The effect of improving density and electronic conductivity

Inactive Publication Date: 2018-05-29
SHANDONG FENGYUAN CHEM CO LTD
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Problems solved by technology

[0003] Aiming at the shortcomings of current inventions such as low compaction density and poor rate performance of lithium iron phosphate, the pr...

Method used

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  • Lithium iron phosphate composite material with high compaction density and method for preparing lithium iron phosphate composite material
  • Lithium iron phosphate composite material with high compaction density and method for preparing lithium iron phosphate composite material
  • Lithium iron phosphate composite material with high compaction density and method for preparing lithium iron phosphate composite material

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Experimental program
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Effect test

Embodiment 1

[0024] 10.4g LiH 2 PO4, 40.4gFe(NO3) 3 9H 2 O was dissolved in 295ml of N,N-dimethylformamide and stirred evenly to obtain a lithium iron phosphate precursor solution with a concentration of 10%, and then 500ml of a graphene oxide solution with a concentration of 5mg / mL was added, filtered, and vacuum-dried at 80°C. 800 high temperature sintering for 2 hours to obtain graphene / lithium iron phosphate material A;

[0025] After that, the lithium titanate was placed in a gas-phase evaporation furnace, and the electron beam evaporation method was used (parameters: vacuum degree 1.0×10 -3 Pa, temperature 150°C, electron gun acceleration voltage 4kV, electron beam current 20mA, oxygen flow rate 18sccm, time ion beam current 30mA, time 40min), so that lithium titanate is deposited on the surface of material A, and graphene / iron phosphate is obtained after cooling Lithium / lithium titanate composite material B, the deposition thickness is 100nm; after that, melamine cyanurate is de...

Embodiment 2

[0027] 10.4g LiH 2 PO4, 23.3g FeC 6 h 5 o 7 ·5H 2 O was dissolved in 1201ml of N,N-dimethylformamide and stirred evenly to obtain a 2% lithium iron phosphate precursor solution, and then 500ml of graphene oxide solution with a concentration of 1mg / mL was added, then filtered, vacuum dried at 80°C, and heated at 800°C Sintering for 2h to obtain graphene / lithium iron phosphate material A;

[0028] After that, lithium magnesium silicate is placed in a gas phase evaporation furnace, and the electron beam evaporation method is used (parameters: vacuum degree 1.0×10 -3 Pa, temperature 150°C, electron gun acceleration voltage 4kV, electron beam current 10mA, oxygen flow rate 15sccm, time ion beam current 20mA, time 10min), so that magnesium lithium silicate is deposited on the surface of material A, and graphene / phosphoric acid is obtained after cooling Lithium iron / lithium titanate composite material B, with a deposition thickness of 50nm; then, by chemical vapor phase method, ...

Embodiment 3

[0030] 10.4g LiH 2 PO4, 23.3g FeC 6 h 5 o 7 ·5H 2 O was dissolved in 90ml of N,N-dimethylformamide and stirred evenly to obtain a 20% lithium iron phosphate precursor solution, and then 500ml of graphene oxide solution with a concentration of 10mg / mL was added, then filtered, vacuum-dried at 80°C, and heated at 800°C Sintering for 2h to obtain graphene / lithium iron phosphate material A;

[0031] After that, lithium vanadate is placed in a gas phase evaporation furnace, and the electron beam evaporation method is used (parameters: vacuum degree 1.0×10 -3 Pa, temperature 150°C, electron gun acceleration voltage 4kV, electron beam current 30mA, oxygen flow rate 20sccm, time ion beam current 40mA, time 60min), so that magnesium lithium silicate is deposited on the surface of material A, and graphene / phosphoric acid is obtained after cooling Iron lithium / lithium titanate composite material B, with a deposition thickness of 200nm; then, by chemical vapor phase method, pentaery...

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Abstract

The invention belongs to the field of preparation of materials for lithium ion batteries, and particularly discloses a lithium iron phosphate composite material with high compaction density and a method for preparing the lithium iron phosphate composite material. The lithium iron phosphate composite material is of a core-shell structure. Cores are made of lithium iron phosphate and graphene dopedin the lithium iron phosphate, and shells are made of inorganic lithium salt and carbon and nitrogen complexes. The method includes preparing lithium iron phosphate precursors; adding graphene oxide solution into the lithium iron phosphate precursors and preparing graphene/lithium iron phosphate precursors by means of hydrothermal reaction, low-temperature drying and thermal reduction; depositingthe lithium salt and organic carbon and nitrogen sources on the surfaces of the graphene/lithium iron phosphate precursors by the aid of electron beam evaporation processes and chemical gas-phase processes. The lithium iron phosphate composite material and the method have the advantages that the compaction density of the lithium iron phosphate composite material can be improved by the aid of the lubrication performance of the graphene, the ion and electron transport rates of the lithium iron phosphate composite material under the high-rate condition can be increased by the aid of the characteristic of the ionic conductivity of the lithium salt of the shell and the electron conductivity of the carbon and nitrogen sources, and the rate performance of the lithium iron phosphate composite material can be improved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery material preparation, and in particular relates to a high compacted density lithium iron phosphate composite material and a preparation method thereof. Background technique [0002] With the market's increasing requirements for the mileage and safety performance of electric vehicles, the lithium-ion battery modules or lithium-ion batteries equipped with electric vehicles are required to have higher energy density and high safety performance. At present, the lithium-ion batteries used in electric vehicles are mainly There are lithium iron phosphate batteries and ternary batteries, and lithium iron phosphate batteries are used in some fields of electric vehicles due to their high safety performance, long cycle life, and good low temperature performance, but their gram capacity and energy density are low limit its scope of application. Therefore, in order to broaden and improve the application fie...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/62H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 李桂臣朱涛
Owner SHANDONG FENGYUAN CHEM CO LTD
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