Preparation method of carbon clocd ferrolithium phosphate of lithium ion battery anode material

A carbon-coated technology for lithium ferrous phosphate and lithium ion batteries, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of poor conductivity, complex process, high cost, and achieve high current discharge capacity improvement, equipment And the effect of simple operation and simple preparation process

Inactive Publication Date: 2006-09-13
宜春天赐高新材料有限公司
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Problems solved by technology

Its characteristic is that it is not easy to realize industrial production, and LiOH must be over 200%, so the cost is also high
[0006] In a word, in the existing synthetic methods, although the solid-phase method is easy to realize industrialization, the ferrous iron source is generally used at present, and the cost is relatively high. It is divided into two steps of sintering, pre-calcination (about 300 ° C) to synthesize the intermediate product and then (500 ° C) ℃-800℃) to obtain the product by sintering at high temperature, the process is complicated; the hydrothermal synthesis is not easy to realize industrialization, and the cost is also high
[0007] Patent CN200410017382.5 adopts lower-priced ferric source and one-step solid phase synthesis of carbon-coated lithium ferrous phosphate composite material (LiFePO 4 / C), simplifies the process, reduces the cost of raw materials and production costs, and uses carbon coating to solve the problem of lithium iron phosphate (LiFePO 4 ) The problem of poor conductivity between particles, the discharge capacity under 0.2C charge and discharge can reach 157mA h, but due to lithium iron phosphate (LiFePO 4 ) The conductivity inside the lattice has not changed, so the 1C discharge capacity has dropped to 124mA h, and the discharge problem of high rate (2C and 3C) has not been solved, and there is still a distance from practical application

Method used

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  • Preparation method of carbon clocd ferrolithium phosphate of lithium ion battery anode material
  • Preparation method of carbon clocd ferrolithium phosphate of lithium ion battery anode material
  • Preparation method of carbon clocd ferrolithium phosphate of lithium ion battery anode material

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Effect test

Embodiment 1

[0023] 0.97 moles of Li(OH).H 2 O, 0.5 mol Fe 2 o 3 , 1 mole NH 4 h 2 PO 4 , 0.004 mol Nb 2 o 5 , plus 40 grams of polypropylene, ball milled for 4 hours, placed in a furnace and heated to 650°C under nitrogen protection, kept at a constant temperature for 10 hours, cooled naturally and then ground again to obtain a niobium-doped and carbon-coated lithium iron phosphate composite material (LiFePO 4 / C). figure 1 It is the XRD spectrum of the material, where (200), (101), (210), (111), (201), (211), (020), (301), (311), (121) and other diffraction peaks for LiFePO 4 characteristic peaks of the material. figure 2 SEM photograph of the material.

Embodiment 2

[0025] 0.90 mol Li(OH)·H 2 O, 1 mole of FePO 4 , 0.01 mol Nb 2 o 5 , plus 40 grams of polypropylene, ball milled for 10 hours, placed in a furnace and heated to 600°C under nitrogen protection, kept at a constant temperature for 20 hours, cooled naturally and then ground again to obtain a niobium-doped and carbon-coated lithium iron phosphate composite material (LiFePO 4 / C).

Embodiment 3

[0027] 0.49 mol Li 2 CO 3 , 1 mol FePO 4 , 0.0025 mol Nb 2 o 5 , plus 30 grams of carbon black, ball milled for 10 hours, placed in a furnace, heated to 700°C under the protection of nitrogen and kept at a constant temperature for 6 hours, then ground again after natural cooling to obtain a niobium-doped and carbon-coated lithium iron phosphate composite material (LiFePO 4 / C).

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Abstract

A process for preparing the carbon coated ferrous lithium phosphate (LiFePO4 / C) used for the positive electrode of Li-ion battery includes such steps as proportionally mixing Li compound, P compound, 3-valence Fe compound, Nd compound and C compound, grinding, sintering in reductive atmosphere at 500-800 deg.C for 4-30 hr, and grinding.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to the preparation of carbon-coated lithium ferrous phosphate (LiFePO 4 / C) method. Background technique [0002] At present, the cathode material of commercial lithium-ion batteries is mainly LiCoO 2 . Due to the extremely low content of Co in nature and its high price, its future development is restricted. Therefore, it is a very urgent task to find cathode materials with excellent electrical properties and low price. Lithium iron phosphate (LiFePO) with olivine structure 4 ) The positive electrode material has rich sources of raw materials, low price, no environmental pollution, high capacity (theoretical capacity is 170mAh / g, energy density is 550Wh / Kg), discharge platform is 3.4V, excellent cycle performance, good stability, especially The advantages of the prepared battery, such as outstanding safety performance, make it have a g...

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 庄大高赵新兵
Owner 宜春天赐高新材料有限公司
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