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Preparation process of lithium ferrous phosphate for positive pole of lithium ion cell

A lithium iron phosphate and lithium ion battery technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as low electronic conductivity and ion diffusion rate, inability to form electronic conductivity, and the influence of intercalation and extraction movement , to achieve the effect of improving electrical conductivity, preventing oxidation and reducing particle size

Active Publication Date: 2006-10-18
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Since there is no continuous FeO 6 co-edge octahedral network, it can not form electronic conduction, at the same time, due to the PO between the octahedron 4 The tetrahedron confines the change in lattice volume, thus making the Li + The embedding-extraction movement is affected
Therefore, compared with the traditional cathode material layered LiCoO 2 , LiNiO 2 , LiMnO 2 and spinel LiMn 2 o 4 Compared to LiFePO 4 It has extremely low electronic conductivity and ion diffusion rate [Thackeray M.Nature Mater., 2002, 1:81], and the charge and discharge capacity is very low at high current density, so it can only be charged and discharged at a very small current, which is greatly restricts its practical application

Method used

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  • Preparation process of lithium ferrous phosphate for positive pole of lithium ion cell
  • Preparation process of lithium ferrous phosphate for positive pole of lithium ion cell
  • Preparation process of lithium ferrous phosphate for positive pole of lithium ion cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 0.5 mole of lithium carbonate, 1 mole of ferrous oxalate, 1 mole of ammonium hydrogen phosphate and 10 g of benaphenaline terpolymer, add to the mixing tank, add 200 g of agate balls, seal the mixing tank, and mix on a three-dimensional mixer 5 hours.

[0027] Put the mixed raw materials in N 2 In the atmosphere protection furnace, under the nitrogen atmosphere of 6L / min, the temperature was raised to 400°C at a rate of 5°C / min, kept at this temperature for 10h, and then raised to 600°C at a rate of 10°C / min, and kept at this temperature Under constant temperature for 30h, then let the furnace cool down to room temperature. figure 1 For the resulting LiFePO 4 The XRD pattern, the addition of additives did not change the LiFePO 4 The crystal structure is maintained with LiFePO 4 The standard XRD spectrum (JCPDS card-190721) has the same crystal structure, all diffraction peaks can be identified according to the standard spectrum, and no impurity peaks of additiv...

Embodiment 2

[0032] Mix 1 mole of lithium acetate, 1 mole of ferrous acetate, 1 mole of ammonium dihydrogen phosphate and 40 g of glucose, add to the mixing tank, add 200 g of agate balls, seal the mixing tank, and mix on a three-dimensional mixer for 10 hours.

[0033] Raise the uniformly mixed raw materials to 300°C at a rate of 10°C / min in an argon atmosphere protection furnace under a nitrogen atmosphere of 9L / min, keep at this temperature for 6h, and then rise to 300°C at a rate of 20°C / min. to 700°C, and kept at this temperature for 20h, then allowed the furnace to cool to room temperature. The electrochemical properties of the obtained positive electrode material were measured according to the method described in Example 1. Figure 5 It is the discharge curve of the material at different current densities. It can be seen from the figure that the synthesized material has excellent high-current discharge performance, and the discharge current is increased by nearly 40 times, and its c...

Embodiment 3

[0035] Mix 1.03 moles of lithium phosphate, 1 mole of ferrous phosphate and 20 g of phenolic resin into a mixing tank, add 200 g of agate balls, seal the mixing tank, and mix on a three-dimensional mixer for 4 hours.

[0036] Raise the uniformly mixed raw materials to 200°C at a rate of 2°C / min in a nitrogen atmosphere protection furnace at 2L / min, keep at this temperature for 30h, and then rise to 200°C at a rate of 5°C / min 600°C, and kept at this temperature for 48h, then allowed the furnace to cool down to room temperature. The electrochemical properties of the obtained positive electrode material were measured according to the method described in Example 1. Figure 6 It is the cycle performance graph of the material. It can be seen from the graph that the synthesized material has excellent cycle performance, and the capacity does not decay after 30 cycles.

[0037] Depend on image 3 It can also be seen that the material has excellent high-temperature charge-discharge an...

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Abstract

The invention relates to a preparation method of lithium ferrous phosphate, a cathode material for lithium ion batteries. A lithium iron phosphate cathode material is obtained by pyrolyzing a certain proportion of lithium salt, ferrous salt, phosphate and organic or polymer compound additive mixture under the protection of an inert atmosphere. The preparation conditions of the lithium ferrous phosphate of the present invention are simple, safe, and low in cost. The addition of additives can effectively control the morphology and crystal structure of the lithium ferrous phosphate, and improve the electrical conductivity of the product. The prepared positive electrode material has high specific capacity, high temperature Good performance, excellent cycle performance and other advantages. The lithium ion battery prepared by using this type of positive electrode material has a wide range of application fields.

Description

Technical field: [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of lithium iron phosphate, a cathode material of lithium ion batteries. Background technique: [0002] Since the advent of lithium-ion batteries in the early 1990s, they have been widely used in mobile communication devices due to their high energy density, high power, good cycle performance and charge retention ability. [0003] At present, the positive electrode materials mainly used in lithium-ion batteries are lithium-intercalating transition metal oxides, and the earliest research is α-sodium ferrite (α-NaFeO 2 ) type layered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ), lithium manganate (LiMnO 2 ) and spinel lithium manganese oxide (LiMn 2 o 4 ) and their doping compounds. Among them, LiCoO 2 It has been widely used in small batteries, but in addition to the constraints of cobalt resources, its overcharge safety l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45
Inventor 陈继涛周恒辉
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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