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Nano-structure lithium manganate/lithium iron phosphate/carbon three-dimensional composite spherical powder material and preparation process thereof

A technology of structural lithium manganate and lithium iron phosphate, applied in the directions of nanotechnology, nanotechnology, structural parts, etc., can solve the problem of not realizing multi-phase nanocomposite, and achieve the effect of inhibiting the dissolution of Mn, good protection, and reducing contact

Active Publication Date: 2014-06-25
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these studies are currently only in the stage of surface modification, and have not realized the true multiphase nanocomposite.

Method used

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  • Nano-structure lithium manganate/lithium iron phosphate/carbon three-dimensional composite spherical powder material and preparation process thereof
  • Nano-structure lithium manganate/lithium iron phosphate/carbon three-dimensional composite spherical powder material and preparation process thereof
  • Nano-structure lithium manganate/lithium iron phosphate/carbon three-dimensional composite spherical powder material and preparation process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] a kind of like figure 1 The nanostructured lithium manganate / lithium iron phosphate / carbon three-dimensional composite spherical powder material of the present invention is mainly composed of nanoporous lithium manganate, nanometer lithium iron phosphate and carbon three-phase, and has a spherical shape. The particle size of the three-dimensional composite spherical powder material is micron-scale, the particle size of the primary particles constituting the three-dimensional composite spherical powder material is nano-scale, and the nano-lithium iron phosphate and carbon are uniformly deposited on the surface of the microspheres and In the pores, the mass fractions of nanoporous lithium manganese oxide, nanometer lithium iron phosphate and carbon in the three-dimensional composite spherical powder material are 90%, 5% and 5%, respectively, that is, nanoporous lithium manganate, nanometer lithium iron phosphate and The mass ratio of carbon is controlled at 9:0.5:0.5. In...

Embodiment 2

[0048] a kind of like figure 1 The nanostructured lithium manganate / lithium iron phosphate / carbon three-dimensional composite spherical powder material of the present invention is mainly composed of nanoporous lithium manganate, nanometer lithium iron phosphate and carbon three-phase, and has a spherical shape. The particle size of the three-dimensional composite spherical powder material is micron-scale, the particle size of the primary particles constituting the three-dimensional composite spherical powder material is nano-scale, and the nano-lithium iron phosphate and carbon are uniformly deposited on the surface of the microspheres and In the pores, the mass fractions of nanoporous lithium manganese oxide, nanometer lithium iron phosphate and carbon in the three-dimensional composite spherical powder material are 50%, 45% and 5%, respectively, that is, nanoporous lithium manganate, nanometer lithium iron phosphate and The mass ratio of carbon is controlled at 5:4.5:0.5. I...

Embodiment 3

[0057] a kind of like figure 1The nanostructured lithium manganate / lithium iron phosphate / carbon three-dimensional composite spherical powder material of the present invention is mainly composed of nanoporous lithium manganate, nanometer lithium iron phosphate and carbon three-phase, and has a spherical shape. The particle size of the three-dimensional composite spherical powder material is micron-scale, the particle size of the primary particles constituting the three-dimensional composite spherical powder material is nano-scale, and the nano-lithium iron phosphate and carbon are uniformly deposited on the surface of the microspheres and In the pores, the mass fractions of nanoporous lithium manganese oxide, nanometer lithium iron phosphate and carbon in the three-dimensional composite spherical powder material are 70%, 27% and 3%, respectively, that is, nanoporous lithium manganate, nanometer lithium iron phosphate and The mass ratio of carbon is controlled at 7:2.7:0.3. In...

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Abstract

The invention discloses a nano-structure lithium manganate / lithium iron phosphate / carbon three-dimensional composite spherical powder material and a preparation process thereof. The nano-structure lithium manganate / lithium iron phosphate / carbon three-dimensional composite spherical powder material mainly comprises nanometer-porous-structure lithium manganate, nanometer lithium iron phosphate and carbon three phase and is in a spherical shape, the grain diameter of the material is at a micrometer grade, the diameter of the primary particle is in nanoscale, and the nanometer lithium iron phosphate and carbon are uniformly deposited on the microspherical surface and / or in the pore of the nanometer porous structure lithium manganate. The preparation process comprises the following steps of adding manganese salt and sodium oxalate into a reactor, sufficiently stirring, and then calcining obtained spherical manganese oxalate in an inert atmosphere to obtain MnO2; then mixing MnO2 powder, lithium salt, iron salt, phosphate and a carbon source with corresponding weight in proportion, and sufficiently reacting to obtain a semi-finished product; and finally carrying out crystallization treatment in a nitrogen-hydrogen mixing atmosphere to obtain a finished product. The product disclosed by the invention can enhance the stability and the conductibility of a battery positive electrode material and improve the electrochemical property of the battery positive electrode material.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, in particular to a lithium manganate / lithium iron phosphate / carbon three-dimensional composite material and a preparation method thereof. Background technique [0002] With the expansion of new energy vehicles' demand for power batteries, it is urgent to develop cathode materials with high safety, high energy density, high power, long cycle life, wide working range, environmental protection and low price. Compared with the high price, extremely limited space for capacity improvement, shortage of resources, and poor safety of the positive electrode material lithium cobalt oxide, lithium manganese oxide as a battery positive electrode material has moderate capacity, high average voltage, good safety, low price, and raw material sources. Wide range, easy synthesis and other advantages, lithium manganese oxide has become the first choice f...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/505H01M4/62B82Y30/00
CPCB82Y30/00H01M4/364H01M4/505H01M4/5825H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 景茂祥沈湘黔庞胜利廖达前周友元
Owner CHANGSHA RES INST OF MINING & METALLURGY
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