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Anode for lithium battery and lithium battery employing the same

A lithium battery and negative electrode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, negative electrodes, etc., can solve the problems of electrode structure changes, reduced life of metal/graphite composite negative electrodes, weak adhesion, etc., to improve life characteristics, high energy density, effect of improving assembly density

Inactive Publication Date: 2008-07-09
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the excellent elasticity of SBR, its weak adhesion makes the electrode structure change upon repeated charging / discharging
In addition, SBR has a high cross-link density and recovery ability, leading to an elastic recovery phenomenon in which the thickness of the electrode after rolling returns to the original thickness, as shown in Fig. 3
[0009] The lifetime of high capacity metal / graphite composite anodes is reduced due to the destruction of the metal active material and electrode structure by excessive volume expansion and contraction during repeated charge / discharge cycles

Method used

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  • Anode for lithium battery and lithium battery employing the same
  • Anode for lithium battery and lithium battery employing the same
  • Anode for lithium battery and lithium battery employing the same

Examples

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Embodiment approach

[0041] According to another embodiment of the present invention, a lithium battery includes the negative electrode. A lithium battery according to one embodiment is shown in FIG. 8 .

[0042] First, a positive electrode can be manufactured as follows. First, a positive active material, a conductive agent, a binder resin, and a solvent are mixed to prepare a positive active material composition. The positive active material composition was directly coated on a metal collector and dried to prepare a positive plate. Alternatively, the positive active material composition is casted on a separate support and dried to form a film, and then the film is separated from the support and laminated on a metal collector to prepare a positive plate.

[0043] The positive active material may be lithium-containing metal oxides generally used in the art. Non-limiting examples of suitable positive electrode active materials include LiCoO 2 , LiMn x o 2x (x=1, 2), LiNi 1-x mn x o 2x (whe...

Embodiment 1

[0055] 77 g of a negative electrode active material having a particle diameter of 20 μm (composite active material including graphite, silicon metal, and carbon obtained from Osaka Gas Chemical Co.) was mixed with 20 g of a conductive agent (graphite conductive agent obtained from Timcal Co., SFG6). 150 g of a 1% by weight sodium carboxymethylcellulose solution was added thereto and mixed to form a solution. 3.75 g of 40% by weight polyethylhexyl acrylate having a particle size of 0.25 μm was dispersed in water, and water was added to the solution and mixed to prepare a slurry having 200 g of water.

[0056] The prepared slurry was coated on a copper (Cu) current collector to a thickness of about 80 μm using a doctor blade. The coated current collector was dried in a hot air drier, and then dried again in vacuum at 120° C. to prepare an anode. The negative electrode was rolled to a thickness of about 50 μm using a roller to prepare a negative electrode plate.

Embodiment 2

[0058] A negative plate was prepared as in Example 1, except that 100 g of a 1% by weight sodium carboxymethylcellulose solution and 5 g of 40% by weight polyethylhexyl acrylate dispersed in water were used.

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Abstract

Anodes for lithium batteries and lithium batteries employing the anodes are provided. In one embodiment, an anode includes an anode active material, and a binder including a waterborne acrylic polymer and a water-soluble polymer. The binder permeates the anode active materials to provide binding force between the anode active materials through point binding. The binder has excellent binding force and elasticity, and does not experience the spring-back phenomenon during electrode manufacture. The anodes have improved assembly density, high capacity and high energy density. Further, the anodes have improved lifetime characteristics since the anode structure is maintained long term over repeated charge / discharge cycles.

Description

[0001] Cross references to related patent applications [0002] This application claims priority and benefits from Korean Patent Application No. 10-2007-0001665 filed with the Korean Intellectual Property Office on Jan. 5, 2007, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a negative electrode for a lithium battery and a lithium battery using the same. Background technique [0004] Lithium batteries have high voltage and high energy density, and have improved stability compared to other batteries such as Ni-Cd batteries. Due to these advantages, lithium batteries are used as power sources for portable electric appliances. However, the development of the small and light display industry requires smaller, lightweight portable appliances with high capacity, thus requiring the development of batteries with higher operating voltage, longer life, and higher energy density than conventional lithium bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/62C09J133/02C09J9/00H01M10/36H01M10/40H01M6/14H01M4/13
CPCH01M4/1395H01M10/0569H01M10/0568H01M4/621H01M10/0525H01M2004/027H01M2004/021H01M4/0435H01M4/1393Y02E60/122Y02E60/10H01M4/13H01M10/058
Inventor 黄胜湜杜锡光
Owner SAMSUNG SDI CO LTD
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