Negative active material, method of preparing the negative active material, negative electrode and lithium battery

A negative electrode active material and a negative electrode technology are applied in the fields of negative electrode active materials and their preparation, negative electrodes and lithium batteries, and can solve the problems of unsatisfactory electrical conductivity and life characteristics of negative electrode active materials.

Active Publication Date: 2013-05-08
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity and lifetime characteristics of negat...

Method used

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  • Negative active material, method of preparing the negative active material, negative electrode and lithium battery
  • Negative active material, method of preparing the negative active material, negative electrode and lithium battery
  • Negative active material, method of preparing the negative active material, negative electrode and lithium battery

Examples

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Effect test

example 1

[0116] Example 1: Preparation of negative electrode active material

[0117] In a graphite rod with a diameter of about 25 mm and a length of about 300 mm, a sample entry portion with a diameter of about 22 mm and a height of about 200 mm is formed, and 30 g of carbon black, 60 g of SiO 2 and 100 g of Si were sequentially filled into the sample entry portion to prepare a negative electrode for arc discharge.

[0118] Separately, a molybdenum (Mo) electrode was used as a positive electrode for arc discharge.

[0119] In the arc discharge apparatus, set the negative electrode at an interval of approximately 300 mm from the positive electrode, and then perform pumping until the pressure of the chamber drops to approximately 2 × 10 -1 Torr, next filled with argon. It was then supplied with a current of about 300A and a DC voltage of about 40V to perform arc discharge, thereby completing the preparation of the negative electrode active material.

example 2

[0120] Example 2: Preparation of negative electrode active material

[0121] A negative electrode active material was prepared in the same manner as in Example 1 except that 20 g of carbon black was used in preparing the negative electrode for arc discharge.

example 3

[0122] Example 3: Preparation of negative electrode active material

[0123] A negative electrode active material was prepared in the same manner as in Example 1 except that 10 g of carbon black was used in preparing the negative electrode for arc discharge.

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Abstract

The present invention provides a negative active material, a method of preparing the negative active material, a negative electrode including the negative active material, and a lithium battery comprising the electrode. The negative active material including: a composite including a matrix comprising silicon oxide, silicon carbide, carbon and silicon particles dispersed in the matrix; and a carbon coating film formed on a surface of the composite, wherein an intensity ratio of a SiC peak to a Si peak in an X-ray diffraction spectrum is at least 1.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2011-0115915 filed with the Korean Intellectual Property Office on Nov. 8, 2011, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0002] One or more embodiments relate to a negative active material, a method of preparing the negative active material, an electrode including the negative active material, and a lithium battery. Background technique [0003] The development of portable electronic devices, communication devices, etc. has increased the demand for lithium batteries with high energy density. [0004] Oxides of metals such as vanadium, silicon, bismuth, zirconium, etc. are used as negative electrode active materials for lithium batteries. [0005] If silicon oxide is used as the negative electrode active material, the capacity of the formed electrode is high. However, the lifetime characteristics and conductivity characteristics of the electro...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62H01M10/0525
CPCY02E60/12H01M4/1393H01M4/133Y02E60/122H01M4/625Y02T10/7011H01M4/48H01M4/1395H01M4/483H01M4/366H01M4/386H01M4/364H01M4/134H01M4/362Y02E60/10
Inventor 金德炫金载明朱圭湳金泰植
Owner SAMSUNG SDI CO LTD
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