Lithium iron phosphate composite positive electrode material with surface coated with titanium nitride and graphene as well as preparation method and application of material

A composite cathode material, lithium iron phosphate technology, applied in the direction of battery electrodes, electrochemical generators, electrical components, etc., can solve the application limitations of graphite anode materials, the improvement of high current charge and discharge performance is not obvious, etc. Electron and ion transport ability, improved high rate capability, low cost effect

Inactive Publication Date: 2014-10-29
CHANGSHA SAIWEI ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current two ways to improve the performance of graphite, especially the improvement of high-current charge and discharge perfo

Method used

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  • Lithium iron phosphate composite positive electrode material with surface coated with titanium nitride and graphene as well as preparation method and application of material
  • Lithium iron phosphate composite positive electrode material with surface coated with titanium nitride and graphene as well as preparation method and application of material

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Embodiment 1

[0027] A lithium iron phosphate composite positive electrode material coated with titanium nitride and graphene on the surface of the present invention, the lithium iron phosphate composite positive electrode material uses lithium iron phosphate material as the core, and a dense layer of lithium iron phosphate material is coated on the surface of the lithium iron phosphate material A conductive network film mainly composed of titanium nitride and graphene; the mass of the conductive network film is 2% of the mass of the lithium iron phosphate material.

[0028] The preparation method of the lithium iron phosphate composite positive electrode material coated with titanium nitride and graphene on the surface of the present embodiment comprises the following steps:

[0029] Add 5g of graphene to 250mL of ethanol, ultrasonic treatment for 1h to form a stable suspension A; dissolve 9.7g of urea and 25.8g of titanium dioxide in 250mL of water to make solution B; put 980g of iron phos...

Embodiment 2

[0033] A lithium iron phosphate composite positive electrode material coated with titanium nitride and graphene on the surface of the present invention, the lithium iron phosphate composite positive electrode material uses lithium iron phosphate material as the core, and a dense layer of lithium iron phosphate material is coated on the surface of the lithium iron phosphate material A conductive network film mainly composed of titanium nitride and graphene; the mass of the conductive network film is 2% of the mass of the lithium iron phosphate material.

[0034] The preparation method of the lithium iron phosphate composite positive electrode material coated with titanium nitride and graphene on the surface of the present embodiment comprises the following steps:

[0035]Add 5g of graphene to 250mL of ethanol, ultrasonic treatment for 1h to form a stable suspension A; dissolve 9.7g of urea and 11.6g of titanium hydroxide in 100mL of organic acid to make solution B; 980 g lithiu...

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Abstract

The invention provides a lithium iron phosphate composite positive electrode material with a surface coated with titanium nitride and graphene, a preparation method of the material and an application of the material in preparation of a lithium ion battery. According to the lithium iron phosphate composite positive electrode material, a lithium iron phosphate material is used as an inner core; the surface of the lithium iron phosphate material is coated with a conductive network film which consists of titanium nitride and graphene; and the mass of the conductive network film is 0.2%-10% of the mass of the lithium iron phosphate material. The preparation method of the material comprises the following steps: uniformly mixing the lithium iron phosphate material with graphene, a nitride source and a titanium-containing compound in a dispersion medium to prepare a mixed material, drying the mixed material, subsequently sintering the mixed material at 400 DEG C to 900 DEG C for 6-24 hours in the presence of inert protective atmosphere so as to prepare the lithium iron phosphate composite positive electrode material with the surface coated with titanium nitride and graphene. The lithium iron phosphate composite positive electrode material is relatively high in conductivity and tap density and relatively good in rate capability and cycle performance; and the preparation method is simple in steps, low in cost and simple to operate.

Description

technical field [0001] The invention relates to a lithium iron phosphate-containing composite material and its preparation method and application, in particular to a graphene-containing lithium iron phosphate composite positive electrode material and its preparation method and application. Background technique [0002] With the development of electronic products in the direction of miniaturization and mobility, and the continuous promotion of power batteries for electric tools, electric motorcycles and electric vehicles, high-power and high-capacity lithium-ion batteries have become a hot spot in the development of countries all over the world. The cathode material is one of the four main materials of lithium-ion batteries. There are many types of cathode materials for lithium-ion batteries currently available, and lithium iron phosphate (LiFePO 4 ) material is the most promising cathode material for lithium-ion batteries in the industry, and it is also the cathode material ...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397H01M4/62
CPCH01M4/366H01M4/5825H01M4/583H01M4/625H01M10/0525H01M2220/20Y02E60/10
Inventor 邓凌峰谭彬
Owner CHANGSHA SAIWEI ENERGY TECH
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