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Quaternary metal phosphate lithium ion battery cathode material and preparation method thereof

A technology for lithium phosphate and ion batteries, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of complex preparation process, low energy density, poor cycle performance of phosphate cathode materials, etc., and achieves a simple and good preparation process. The effect of lithium deintercalation, solving the problems of low ionic conductivity and low diffusion rate

Inactive Publication Date: 2015-04-01
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a kind of Ni, Mn, Fe, Co four kinds of metal ions to prepare the molecular formula is LiNi 0.05 mn 0.25 Fe 0.3 co 0.4 PO 4 Quaternary metal phosphate lithium ion battery cathode material

Method used

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  • Quaternary metal phosphate lithium ion battery cathode material and preparation method thereof
  • Quaternary metal phosphate lithium ion battery cathode material and preparation method thereof
  • Quaternary metal phosphate lithium ion battery cathode material and preparation method thereof

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preparation example Construction

[0043] Battery preparation and electrochemical performance testing methods

[0044] ①, the preparation of the positive electrode sheet of the battery;

[0045] The molecular formula will be obtained as LiNi 0.05 mn 0.25 Fe 0.3 co 0.4 PO 4 The positive electrode material of quaternary phosphate lithium ion battery, conductive carbon powder, and organic binder polyvinylidene fluoride (PVDF) are calculated according to the mass ratio, that is, the positive electrode material of quaternary phosphate lithium ion battery: conductive carbon powder: organic binder Poly(tetrafluoroethylene)=80:10:10 for mixing, fully stirred to form a slurry, coated on the surface of aluminum foil, after drying, rolled several times to obtain the positive electrode sheet of the battery;

[0046] ②, battery assembly and performance testing

[0047] Evaluation of the electrochemical performance of cathode materials for quaternary phosphate lithium-ion batteries using 2016-type half-cells

[00...

Embodiment 1

[0052] A kind of quaternary metal phosphate lithium ion battery cathode material, its molecular formula is LiNi 0.05 mn 0.25 Fe 0.3 co 0.4 PO 4 .

[0053] The above-mentioned preparation method of a quaternary metal phosphate lithium-ion battery positive electrode material, the raw materials used in its preparation, calculated in parts by mass, its composition and content are as follows:

[0054] Phosphoric acid 115 parts

[0055] Iron powder 16.8 parts

[0056] Nickel oxide 3.75 parts

[0057] Lithium hydroxide hydrate 42 parts

[0058] 37.2 parts of cobalt hydroxide

[0059] Manganese carbonate 28.75 parts

[0060] 15 parts sucrose

[0061] 550 parts of deionized water;

[0062] Its preparation process specifically comprises the following steps:

[0063] (1) 115 parts of phosphoric acid were added to the total amount of 5 / 11, that is, 250 parts of deionized water, and then 16.8 parts of reduced iron powder were added to react for 3 hours to obtain the ferrous pho...

Embodiment 2

[0075] A quaternary metal phosphate lithium ion battery positive electrode material is a lithium ion positive electrode material, and its molecule is LiNi 0.05 mn 0.25 Fe 0.3 co 0.4 PO 4 .

[0076] The above-mentioned preparation method of a quaternary metal phosphate lithium-ion battery positive electrode material, the raw materials used in its preparation, calculated in parts by mass, its composition and content are as follows:

[0077] Phosphoric acid 115 parts

[0078] Iron powder 16.8 parts

[0079] Nickel oxide 3.75 parts

[0080] Lithium hydroxide hydrate 42 parts

[0081]Cobalt hydroxide 35.34 parts

[0082] Manganese carbonate 31.05 parts

[0083] 15 parts sucrose

[0084] 550 parts of deionized water;

[0085] Its preparation process specifically comprises the following steps:

[0086] (1) 115 parts of phosphoric acid were added to the total amount of 5 / 11, that is, 250 parts of deionized water, and then 16.8 parts of reduced iron powder were added to rea...

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Abstract

The invention discloses a quaternary metal phosphate lithium ion battery cathode material and a preparation method thereof. The molecular formula of the quaternary metal phosphate lithium ion battery cathode material is LiNi0.05Mn0.25Fe0.3Co0.4PO4. The preparation method of the quaternary metal phosphate lithium ion battery cathode material comprises the following steps: adding reduced iron powder into a phosphoric acid solution to react so as to form a ferrous phosphate precursor, then dropwise adding lithium hydrate and a sugar solution into the ferrous phosphate precursor for reaction, adding the obtained mixture containing the ferrous phosphate precursor into a nanometer ball mill for ball milling, then adding cobaltous hydroxide, manganese carbonate and nickel protoxide for mixing and milling, after the obtained quaternary phosphate precursor solution spray is dried and placed into a crucible, controlling the temperature to be 600 to 650 DEGC, and calcining under a nitrogen atmosphere for 5 to 9 hours to obtain the quaternary metal phosphate lithium ion battery cathode material with an even spherical structure. The quaternary metal phosphate lithium ion battery cathode material has excellent electrochemical properties, has a specific capacity of 143mAh / g and an energy density of 610Wh / Kg, and has a capacity retention ratio of 96.5 percent after 10 times of circulation.

Description

technical field [0001] The invention relates to a positive electrode material of a quaternary metal phosphate lithium ion battery and a preparation method thereof. Background technique [0002] In the contemporary society with the rapid development of science and technology, the sustainable development of human society is facing two severe problems - energy crisis and environmental pollution. Based on two major problems, countries all over the world attach great importance to the development of electric vehicles. In the 2008 National High-tech Research and Development Program (863 Program), the major project guideline of "energy saving and new energy vehicles" in the field of modern transportation technology in my country also listed the development of electric vehicles as an important development direction. At present, one of the main technologies of electric vehicles is to use lithium-ion batteries as the power system. [0003] As a form of energy in chemical power sourc...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/1397
CPCH01M4/136H01M4/1397H01M4/5825Y02E60/10
Inventor 常程康邓玲王永强郭倩蔡元元石明明
Owner SHANGHAI INST OF TECH
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