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Negative electrode active material and preparation method thereof, negative electrode and lithium battery

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

Active Publication Date: 2017-03-01
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity and lifetime characteristics of negative active materials formed by using these methods are unsatisfactory

Method used

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  • Negative electrode active material and preparation method thereof, negative electrode and lithium battery
  • Negative electrode active material and preparation method thereof, negative electrode and lithium battery
  • Negative electrode active material and preparation method thereof, negative electrode and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0116] Example 1: Preparation of Anode Active Materials

[0117] A sample entry portion with a diameter of about 22 mm and a height of about 200 mm was formed in a graphite rod with a diameter of about 25 mm and a length of about 300 mm, 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 device, the negative electrode was set apart from the positive electrode by an interval of about 300 mm, and then pumping was performed until the pressure of the chamber was reduced to about 2×10 -1 tor, followed by filling with argon. Then, a current of about 300 A and a DC voltage of about 40 V were supplied thereto to perform arc discharge, thereby completing the preparation of the negative electrode active material.

example 2

[0120] Example 2: Preparation of Anode Active Materials

[0121] A negative 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 Anode Active Materials

[0123] A negative 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

A negative active material (10) including: a composite (11) including a matrix (11) comprising silicon oxide, silicon carbide, carbon and silicon particles (12) dispersed in the matrix (11); and a carbon coating film (13) formed on a surface of the composite (11), wherein an intensity ratio of a SiC peak to a Si peak in an X-ray diffraction spectrum is at least 1, a method of preparing the negative active material, a negative electrode including the negative active material, and a lithium battery including the electrode.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2011-0115915 filed in 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 negative electrode active materials, methods of making the negative electrode active materials, electrodes including the negative electrode active materials, and lithium batteries. 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 life characteristics and conductivity characteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/62H01M10/0525
CPCH01M4/134H01M4/1395H01M4/364H01M4/366H01M4/386H01M4/48H01M4/483H01M4/625Y02E60/10
Inventor 金德炫金载明朱圭湳金泰植
Owner SAMSUNG SDI CO LTD