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Method of preparing carbon nanotube-olivine type lithium manganese phosphate composites

A technology of carbon nanotubes and lithium manganese phosphate, applied in the direction of carbon nanotubes, phosphorus compounds, nanocarbons, etc., can solve the problems of poor material adhesion, material condensation, difficulty in obtaining battery output characteristic energy density, etc., and achieve capacity retention The effect of rate improvement

Active Publication Date: 2013-10-23
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the conventional method, the material coated on the surface of olivine-type lithium manganese phosphate may not adhere well, or condensation may occur between the coated materials
In addition, it is difficult to obtain a satisfactory output characteristic of the battery and a level of energy density per unit volume

Method used

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  • Method of preparing carbon nanotube-olivine type lithium manganese phosphate composites
  • Method of preparing carbon nanotube-olivine type lithium manganese phosphate composites
  • Method of preparing carbon nanotube-olivine type lithium manganese phosphate composites

Examples

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example 1

[0059] Carbon nanotube olivine lithium manganese phosphate complex

[0060] Acid treatment was performed in the following manner: the multi-walled carbon nanotubes were completely immersed in a 3M acid solution of sulfuric acid and nitric acid in a ratio of 3:1 (w / w) and stirred at 60°C to 80°C for 8 hours to 12 hours, wherein , the multi-walled carbon nanotubes were formed by chemical vapor deposition (CVD) (CM-250 available from Hanhwa Nanotec Co., Ltd., Korea). After the acid treatment, the resulting product was washed with deionized water and dried in an oven maintained at a temperature below 100°C. The purity of the dried carbon nanotubes was about 95%, and it was confirmed by Raman spectroscopy (1024nm laser wavelength) that at 1580cm -1 Peak (I G ) and 1350cm -1 The peak intensity ratio measured near the peak (ID) was 1.18. Next, acid-treated multi-walled carbon nanotubes (0.33 g), lithium carbonate (Li 2 CO 3 , 0.739g), manganese carbonate (MnCO 3 , 1.839g), a...

example 2

[0063] The olivine-type manganese phosphate lithium composite of Example 1 as the positive electrode active material, Super P as a conductive agent, acid-treated MWNT (Muti-walled carbon nanotube, multi-walled carbon nanotube) and PVDF as a binder The mixture was mixed at a ratio of 90:2.5:2.5:5, and the resulting mixture was coated on an aluminum (Al) foil coated with carbon black, thereby manufacturing an electrode plate. Lithium metal as the negative electrode and 1.3M LiPF dissolved in a mixed solution of EC / DMC / EC (5:3:2 weight ratio) as the electrolyte 6 Used to make coin batteries. Here, 5.03 wt% of MWNTs were dispersed in NMP solution by ultrasonic dispersion. MWNTs were acid-treated in the same manner as in Example 1. Here, ultrasonic dispersion was performed at 40° C. for about 1 hour.

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Abstract

Provided are a method of preparing carbon nanotube-olivine type lithium manganese phosphate composites and a lithium secondary battery using the same. The method includes acid-treating a carbon nanotube to purify the carbon nanotube by adding an acid solution to the carbon nanotube, forming a precursor mixture of the carbon nanotube and a metal precursor of olivine type lithium manganese phosphate, and heat-treating the precursor mixture. The carbon nanotube-olivine type lithium manganese phosphate composites can provide high energy density per unit volume and can improve output characteristics.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2012-0030123 filed on March 23, 2012, the contents of which are hereby incorporated by reference in their entirety. technical field [0002] Aspects of the present invention relate to a method of preparing a carbon nanotube olivine-type lithium manganese phosphate compound and a lithium secondary battery using the same. Background technique [0003] As lithium secondary batteries are widely used in small electronic devices, electric vehicles, and power storage, demand for cathode materials for secondary batteries having high safety, long life, high energy density, and high output characteristics is increasing. In recent years, environmentally friendly active materials have been increasingly used since they do not use harmful heavy metals such as cobalt (Co). In particular, the field of application of highly stable positive electrode active materials such as olivine-type lithium manganese phosphate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/36
CPCH01M4/5825Y02E60/122H01M4/625H01M4/583C01B31/026H01M4/136H01M10/052H01M10/0525C01B25/45H01M4/133B82Y30/00B82Y40/00C01B32/17Y02E60/10H01M4/139H01M4/58
Inventor 沈炯哲方晟绿尹东明
Owner SAMSUNG SDI CO LTD