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Lithium secondary battery containing silicon-based or tin-based anode active material

一种阳极活性、活性材料的技术，应用在二次电池、锂蓄电池、活性物质电极等方向，能够解决电池生产率降低、延长等问题

Active Publication Date: 2006-10-18
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires high temperature heat treatment for an extended period of time (eg, 10 hours), thus presenting problems associated with a significant decrease in battery productivity

Method used

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  • Lithium secondary battery containing silicon-based or tin-based anode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0045] Mixed silicon-carbonaceous material complex (Si-C) as anode active material, the mixture of photocurable monomer or oligomer and photoinitiator given in Table 1 below as binder, and 2% Wt carbon black powder was used as conductive material to prepare anode mixture. Then, 100 parts by weight of N-methylpyrrolidone (NMP) was added as a solvent with respect to 100 parts by weight of the anode mixture. The resulting mixture was stirred for about 30 minutes to prepare an anode slurry. The resulting paste was applied to a copper (Cu) foil with a thickness of about 90 μm to a copper (Cu) foil with a thickness of 18 μm, and was treated with a light dose of 10 J / cm in a UV curing device. 2 Photocuring was performed, followed by solvent heat drying at 130° C. for 1 hour to prepare an anode.

[0046] A cathode mixture was prepared by mixing lithium cobalt oxide as a cathode active material, polyvinylidene fluoride (PVDF) as a binder, and 3% by weight of carbon black powder as a ...

experiment example 1

[0054]In order to evaluate battery performance, for each of the coin batteries prepared in Examples 1-6 and Comparative Examples 1 and 2, changes in battery charge / discharge characteristics were examined using a charge / discharge measuring device. That is, for each coin cell, 2 charge / discharge cycles at a rate of 0.1C and 50 charge / discharge cycles at a rate of 0.5C were repeated at a temperature of 23°C using a constant current / constant voltage method. The capacity retention (%) of the corresponding coin cells at the 50th cycle compared to the initial capacity is shown in Table 1 below. The evaluation was performed using five or more coin cells of Examples 1-6 and Comparative Examples 1 and 2, respectively, and expressed as an average value.

[0055]

Photopolymerizable material (wt%)

anode active material

Content (wt%)

Photoinitiator (wt%)

50-cycle efficiency

(%)

Example 1

Bisphenol A (14)

82

UVI-6974(...

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Abstract

Provided is a lithium secondary battery comprising an anode mix including a silicon- or tin-based material as an anode active material, and as a binder, a photo-polymerizable material composed of one or more monomers selected from the group consisting of an epoxy derivative, polyester acrylate and epoxy acrylate, or oligomers or polymers thereof, wherein an anode can be prepared within a short period of time via a simplified manufacturing process by applying the anode mix to a current collector and polymerizing the applied anode mix with light-irradiation, and further, superior charge / discharge cycle characteristics of the battery are provided due to stable maintenance of binding between active materials and between the active material and current collector, regardless of significant volume changes of the anode active material occurring upon charging / discharging the battery.

Description

field of invention [0001] The present invention relates to secondary lithium batteries containing silicon- or tin-based anode active materials. More specifically, the present invention relates to a secondary lithium battery comprising an anode mixture containing a silicon- or tin-based active material as an anode active material, and a binder selected from one or more of A photopolymerizable material composed of two monomers: epoxy derivatives, polyester acrylate and epoxy acrylate, or oligomers or polymers thereof, whereby the anode can be prepared in a short time by simplifying the manufacturing method, The method is to apply an anode mixture to a current collector and polymerize the applied anode mixture with light. In addition, since the bonding between the active materials, and between the active materials and the current collector is stably maintained, the present invention provides excellent battery charge / discharge cycle characteristics regardless of significant chang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/02H01M4/04H01M4/62H01M10/052H01M10/0564H01M10/36
CPCH01M4/0435H01M4/0471H01M4/621H01M4/622H01M10/052H01M10/0564H01M2004/027H01M4/386H01M4/387Y02E60/10H01M10/058H01M4/38H01M4/62
Inventor 金英玟吴垠锡金周炫柳旼廷
Owner LG CHEM LTD
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