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Production method of lithium ion power cell ferrous phosphate lithium composite material

A lithium iron phosphate, power battery technology, applied in electrode manufacturing, phosphorus compounds, battery electrodes, etc., can solve the problems of difficult to obtain single-phase LiFePO, low utilization rate of active materials, difficult lithium ion diffusion, etc., and achieve excellent cycle performance. , excellent electrical conductivity and high current charge-discharge performance, and the effect of high synthesis process

Inactive Publication Date: 2008-07-16
NORTHEAST NORMAL UNIVERSITY
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Problems solved by technology

But the following main disadvantages hinder its practical application: (1) Fe in the synthesis 2+ easily oxidized to Fe 3+ , it is not easy to obtain single-phase LiFePO 4 ; (2) lithium ions in LiFePO 4 Diffusion is difficult in medium, resulting in low utilization of active materials; (3) LiFePO 4 Its electronic conductivity is low, so it can only work at very small currents

Method used

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  • Production method of lithium ion power cell ferrous phosphate lithium composite material
  • Production method of lithium ion power cell ferrous phosphate lithium composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0019] 8 g Fe 2 o 3 and 10.4 g LiH 2 PO 4 According to the stoichiometric ratio of 1:1, add 1.6 grams of phenolic resin (polyacene after carbonization) and 3.2 grams of sucrose, ball mill in ethanol solution for 5 hours, then spray dry, and carry out temperature programming in nitrogen atmosphere , raised at 5°C / min to 800°C for 3 hours, then cooled rapidly.

[0020] The SEM image of the obtained composite material measured is shown in Figure 1, and a spherical lithium iron phosphate composite material with uniform particle size was synthesized.

[0021] The composite material that obtains with embodiment 1 is made electrode by following method:

[0022] Take the composite material obtained in Example 1 at a mass ratio of 80:10:10: acetylene black: polytetrafluoroethylene, and grind them evenly to make an electrode. 1mol / L LiPF in a mixed solvent of dimethyl ester (1:1 by volume) 6 As the electrolyte, polypropylene microporous membrane as the diaphragm, assembled into a ...

Embodiment 2

[0024] O.1mol H 3 PO 4 , 0.1mol LiOH·H 2 O, 0.05mol Fe 2 o 3 Proportioning according to stoichiometric ratio, then add 1.6 grams of phenolic resin (accounting for 10% of synthetic lithium iron phosphate mass) and 1.6 grams of glucose, ball mill in acetone solution for 4 hours, spray dry, carry out temperature program in nitrogen atmosphere , raised to 700°C at 5°C / min, kept for 8 hours, cooled rapidly and then ground. The simulated battery was assembled in the same way, and the first discharge capacity at 1C rate can reach 140mAh / g.

Embodiment 3

[0026] 0.1mol NH 4 h 2 PO 4 , 0.1mol LiOH·H 2 O, 0.05mol Fe 2 o 3 According to the stoichiometric ratio, add 0.8 grams of polyaniline (accounting for 10% of the synthetic lithium iron phosphate mass) and 3.2 grams of glucose, ball mill in an aqueous solution for 3 hours, spray dry, and carry out a temperature program in a nitrogen atmosphere , raised to 750°C at 3°C / min, kept for 5 hours, cooled rapidly and then ground. The simulated battery was assembled in the same way, and the first discharge capacity at 1C rate can reach 138mAh / g.

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Abstract

The invention belongs to the energy transition material preparation technical field, in particular relate to a preparation method for lithium iron phosphate composite materials. The preparation method of the invention comprises the following steps: firstly, gulf red, phosphorus source, lithium source and carbon source are mixed in proportion; secondly, uniform ball milling is performed; thirdly, spray drying is performed; fourthly, high temperature heat treatment is performed under the protection of inoxidizing atmosphere, and then the lithium iron phosphate composite materials are obtained with an average grain diameter of 0.1 to 10 micrometers and a tap density of 1.2 to 1.5 gram per cubic centimeter. After the lithium iron phosphate composite materials are assembled into a battery, first discharge specific capacity of 0.2C multiplying power under room temperature can reach 150 to 160 mAh / g, and first discharge specific capacity of 1C multiplying power under room temperature can reach a high specific capacity of 140 to 150 mAh / g; after circulation for 100 times under various different multiplying powers, reversible capacity can still reach over 90 percent of the original capacity, thereby cyclicity is high. Moreover, safety is good, and the battery is environment friendly and has low cost, and can be widely applied in mobile telephones, notebook computers, various portable devices and the electric motor car field.

Description

technical field [0001] The invention belongs to the technical field of preparation of energy conversion materials, and in particular relates to a preparation method of a lithium iron phosphate composite material used for the anode of a lithium ion power battery. Background technique [0002] Economic development, resource utilization and environmental protection are the focus of attention in the new century, and the development of battery technology and industry is closely related to the three. The increasing depletion of energy and the requirements of environmental protection require chemical power sources to make up for it. Lithium-ion batteries, which represent the most advanced technology of contemporary chemical power sources, have been widely used in portable electronic devices such as mobile phones, notebook computers, and small cameras since their advent. The advancement of electrode materials has been promoting the continuous development of this technology. Advanced...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58H01M4/48C01B25/45
CPCY02E60/10
Inventor 谢海明孙立群王荣顺苏忠民
Owner NORTHEAST NORMAL UNIVERSITY
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