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Electrode active material for secondary battery

A technology of electrode active materials and metals, applied in battery electrodes, secondary batteries, active material electrodes, etc., can solve problems such as inability to use

Inactive Publication Date: 2008-10-29
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned electrode active materials still cannot sufficiently provide excellent cycle life characteristics, and therefore cannot be used as practical electrode active materials for lithium secondary batteries.

Method used

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  • Electrode active material for secondary battery
  • Electrode active material for secondary battery
  • Electrode active material for secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Silicon and natural graphite were mixed in a ratio of 50 parts by weight: 50 parts by weight to provide a mixture, and stainless steel balls having a diameter of 3 mm were introduced into a mechanical fusion system provided by Hosokawa Micron Co. with the mixture in a ratio of 5:1 by weight middle. Then the produced mixture was subjected to mechanical alloying at a rotation speed of 600 rpm for 30 minutes to provide an electrode active material having a core layer of at least two core particles, an amorphous carbon layer and a crystalline carbon layer.

[0054] Then 100 parts by weight of the electrode active material powder obtained by the above method, 10 parts by weight of PVdF as a binding agent and 10 parts by weight of acetylene black as a conductive agent are mixed, and NMP is further added to the above-mentioned mixture as a solvent, finally producing The mixture was mixed thoroughly to provide a homogeneous slurry. Then the slurry was coated on the copper foil...

Embodiment 2

[0058] A battery was provided in the same manner as described in Example 1, except that the mixing ratio of silicon and natural graphite was 50 parts by weight: 50 parts by weight to provide a mixture, and zirconia balls having a diameter of 5 mm and the mixture were in a weight ratio of 10: A ratio of 1 was introduced into a mechanical fusion system provided by Hosokawa Micron Co., and then the resulting mixture was subjected to mechanical alloying at a rotating speed of 600 rpm for 30 minutes to provide an electrode active material having at least two core particles The core layer, amorphous carbon layer and crystalline carbon layer.

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Abstract

Disclosed is an electrode active material comprising: a core layer capable of repeating lithium intercalation / deintercalation; an amorphous carbon layer; and a crystalline carbon layer, successively, wherein the core layer comprises at least two core particles. A secondary battery comprising the same electrode active material is also disclosed. The electrode active material can inhibit variations in volume of the core layer that may occur during repeated charge / discharge cycles, since the core layer comprising at least two core particles, each core particle having an increased area that is in contact with the carbon layer coated thereon. Therefore, the battery using the electrode active material can provide improved cycle life characteristics.

Description

technical field [0001] The invention relates to an electrode active material for a secondary battery and a secondary battery comprising the electrode active material. Background technique [0002] A general lithium secondary battery is obtained by using a material capable of intercalation / deintercalation of lithium ions as a cathode and an anode, and injecting an organic electrolyte or a polymer electrolyte between the cathode and the anode. Such lithium secondary batteries generate electrical energy through redox reactions at the cathode and anode caused by intercalation / extraction of lithium ions. [0003] At present, carbonaceous materials have been used as electrode active materials for preparing lithium secondary battery anodes. However, there is still a demand for electrode active materials with higher capacitance to further improve the capacitance of lithium secondary batteries. [0004] In order to meet the demand, metals that exhibit higher charge / discharge capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02
CPCY02E60/122H01M4/133H01M4/587H01M4/38H01M4/366H01M10/0525Y02E60/10H01M4/02
Inventor 权五重李龙珠张元硕金寄泰李栖宰李琪永
Owner LG CHEM LTD
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