Negative electrode for rechargeable lithium battery, and rechargeable lithium battery including the same

A lithium battery and recharging technology, applied in the field of rechargeable lithium battery and negative electrode for rechargeable lithium battery, can solve the problem of not showing sufficient improvement in battery performance.

Active Publication Date: 2009-06-03
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of such oxides for negative electrodes has not shown sufficient improve

Method used

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  • Negative electrode for rechargeable lithium battery, and rechargeable lithium battery including the same
  • Negative electrode for rechargeable lithium battery, and rechargeable lithium battery including the same
  • Negative electrode for rechargeable lithium battery, and rechargeable lithium battery including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0200] Embodiment 1: the making of negative electrode

[0201] Silica negative electrode active material (SHR12, Shin-Etsu Chemical Co., Ltd.) was mixed with carboxymethylcellulose with a weight average molecular weight (Mw) of 90,000 dissolved in water and polyacrylic acid with a Mw of 100,000 dissolved in water , to provide a composition for forming an active material layer. Carboxymethyl cellulose and polyacrylic acid are provided at a molar ratio of 73.5:26.5 according to dry state calculation, and the obtained mixture includes 93 wt% of silicon oxide negative electrode active material, 5 wt% of carboxymethyl cellulose and 2 wt% of polyacrylic acid.

[0202] The composition for forming the active material layer was screen-printed on the Cu current collector, and then heat-treated at 90°C. Next, at 200°C and a vacuum pressure of 1×10 -6 It was heat-treated again under the support to provide a negative electrode.

Embodiment 2

[0203] Embodiment 2: the making of negative electrode

[0204] Mix 93wt% of silica negative electrode active material (SHR12, Shin-Etsu Chemical Co., Ltd.), 4wt% of carboxymethyl cellulose, 2wt% of polyacrylic acid and 1wt% of conductive agent Super-P in water to provide Composition for forming an active material layer (mixture of carboxymethylcellulose and polyacrylic acid having a molar ratio of 69:31).

[0205] The composition for forming the active material layer was screen-printed on the Cu current collector, and then heat-treated at 90°C. Next, at 200°C and a vacuum pressure of 1×10 -6 It was heat-treated again under the support to provide a negative electrode.

Embodiment 3

[0264] Embodiment 3: the making of negative electrode

[0265] A composition for forming an active material layer was prepared by uniformly mixing 93 wt% of a silicon oxide negative electrode active material (available from Shin-Etsu Chemical Co., Ltd.) and 7 wt% of a binder composition. The adhesive composition is prepared by mixing carboxymethyl cellulose (CMC) with a Mw of 90,000 dissolved in water, polyacrylic acid (PAA) with a Mw of 100,000 dissolved in water, and polyvinyl chloride in a weight ratio of 1:1:1. Vinyl fluoride (PVdF) (available from Solvay Company, Hylar Latex 932).

[0266] The composition for forming the active material layer was screen-printed on the Cu current collector, and then heat-treated at 90°C. Next, at 200°C and a vacuum pressure of 1×10 -6 It was heat-treated again under the support to provide a negative electrode.

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Abstract

A negative electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same are provided. The negative electrode for a rechargeable lithium battery includes a current collector, and a negative active material layer on the current collector. The negative active material layer includes an interpenetrating network, and a negative active material in the interpenetrating network. The interpenetrating network is formed by cross-linking a first polymer having a hydroxyl or amine group and a second polymer having a carboxylic acid group. The negative electrode for a rechargeable lithium battery minimizes volume expansion and imparts good cycle-life characteristics and initial formation efficiency.

Description

technical field [0001] The present invention relates to a negative electrode for a rechargeable lithium battery and a rechargeable lithium battery including the negative electrode. Background technique [0002] Recently, rechargeable lithium batteries have attracted attention as power sources for small portable electronic devices. Lithium batteries use an organic electrolyte solution, resulting in a discharge voltage twice that of conventional batteries using an alkaline aqueous solution. Therefore, rechargeable lithium batteries have high energy density. [0003] Lithium-transition element composite oxides capable of intercalating lithium such as LiCoO 2 , LiMn 2 o 4 、LiNi 1-x co x o 2 (where 0<x<1) etc. have been studied as positive electrode active materials for rechargeable lithium batteries. [0004] Various carbon-based materials capable of intercalating and deintercalating Li ions, such as artificial graphite, natural graphite, and hard carbon, have been...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/60H01M10/36H01M4/58H01M10/04
CPCY02E60/12Y02E60/10Y02P70/50H01M4/131H01M4/133H01M4/134H01M4/62H01M4/622H01M4/64H01M10/052H01M2004/021H01M2004/027
Inventor 崔南顺柳京汉李相旻朴修泳李斗庆崔完旭
Owner SAMSUNG SDI CO LTD
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