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Electrode for secondary cell, method for producing the same, and secondary cell

A secondary battery and electrode technology, which is applied in the direction of electrode manufacturing, battery electrodes, electrode collector coating, etc., can solve the problems of battery internal resistance increase, achieve the effects of suppressing internal resistance, expanding contact area, and improving adhesion

Inactive Publication Date: 2013-01-16
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The surface roughening by spraying method used in Patent Document 2 can increase the surface area of ​​the current collector of the positive electrode, but only relatively smooth unevenness can be obtained.
Therefore, although the surface area of ​​the current collector is increased, there is a problem that under the coexistence of the electrolyte, the binder absorbs the electrolyte and expands, causing stress at the interface between the positive electrode mixture layer and the current collector, and the positive electrode The mixture layer peels off from the interface with the current collector, increasing the internal resistance of the battery

Method used

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  • Electrode for secondary cell, method for producing the same, and secondary cell
  • Electrode for secondary cell, method for producing the same, and secondary cell
  • Electrode for secondary cell, method for producing the same, and secondary cell

Examples

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no. 1 approach

[0033] (Manufacture of electrodes for secondary batteries by chemical etching method (1))

[0034] In the case of using aluminum foil to form the current collector, it contains 5 to 30% by weight of inorganic acid (the same below), 1.5 to 9% of iron ions as a source of ferric ion, and 0.02 to 1.5% of manganese ions as a source of manganese ions. And aluminum or aluminum alloy surface roughening agent of 0.05-1% aqueous solution of copper ion as divalent copper ion.

[0035] In this case, examples of the inorganic acid include hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid, perchloric acid, sulfamic acid and the like. The concentration of the inorganic acid is 5-30%, preferably 7-25%, more preferably 12-18%. If the concentration is less than 5%, the roughening speed of aluminum is slow, and if it exceeds 30%, the crystallization of aluminum salt is likely to occur when the liquid temperature is lowered, and there is a risk of poor operability such as clogging o...

no. 2 approach

[0049] (Manufacture of electrodes for secondary batteries using chemical etching method (2))

[0050] A surface treatment agent containing divalent copper complexes containing azoles, an organic acid, and an aqueous solution to which halogen ions are added is used. The copper complex of azoles functions as an oxidizing agent for oxidizing metal copper and the like. By using a divalent copper complex of azoles among various divalent copper complexes having an oxidation function, a moderate etching rate can be exhibited as a surface treatment agent. Examples of the azoles include diazoles, triazoles, tetrazoles, derivatives thereof, and the like.

[0051] The content of the divalent copper complex of the azoles can be appropriately set according to the target oxidizing power, etc., and is preferably 1 to 15% (% by weight, the same below) in terms of solubility and stability of the complex. . The divalent copper complex of azoles may be added as a copper complex, or a divalent...

no. 3 approach

[0058] (Manufacture of electrodes for secondary batteries by electrolytic etching)

[0059] When the current collector is formed of aluminum foil, in order to perform direct current etching on the current collector, it is preferable to contain 3 to 10% of hydrochloric acid and 0.05 to 1% of oxalic acid at a liquid temperature of 50 to 80°C. In the aqueous solution, the applied current density is 100~500mA / cm 2 , The power is 30~60C / cm 2 of direct current.

[0060] In addition, in order to perform AC etching on a current collector formed of aluminum foil, preferably, in an aqueous solution containing 5 to 10% of hydrochloric acid, 0.5 to 2% of phosphoric acid, and 0.1 to 1% of sulfuric acid and having a liquid temperature of 30 to 50°C, The applied current density is 200~600mA / cm 2 , the frequency is 20~70Hz, the power is 50~100C / cm 2 of alternating current.

[0061] In addition, when the current collector is aluminum foil, lithium manganese composite oxide (Li x mn 2 o ...

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Abstract

A secondary cell electrode includes a mix layer containing an active substance, a conductive agent, and a binder which is swollen by coexistence with an electrolytic solution and thus has a volume thereof increased; and a current collector formed of a conductive metal foil, the mix layer being located right on the current collector. The current collector has, in a surface thereof, a first concaved portion which is opened and a first convexed portion forming a wall of the first concaved portion; at least a part of a side surface of at least either one of the first concaved portion and the first convexed portion includes at least either one of a second concaved portion and a second convexed portion; and a mixture containing at least either one of the binder, the conductive material and the active substance is put into a space in the first concaved portion.

Description

technical field [0001] The present invention relates to an electrode having fine unevenness formed on the surface of a current collector, a method for manufacturing the electrode, and a secondary battery using the electrode. Background technique [0002] Lithium-containing olivine-type lithium iron phosphate has a slow lithium insertion and detachment reaction when it is used as a battery for charging and discharging. Compared with the existing lithium cobaltate and lithium manganate used as positive electrode active materials, the electronic conductivity is very low. Therefore, the internal resistance of the battery is high, and the polarization during high-rate discharge is large. [0003] In order to solve the above problems, Patent Document 1 proposes reducing the particle diameter of lithium-containing olivine-type phosphate. [0004] However, in the technique disclosed in Patent Document 1, since a positive electrode active material having a small particle size is use...

Claims

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Application Information

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IPC IPC(8): H01M4/70H01M4/139
CPCY02E60/12Y02E60/122H01M4/661H01M4/139H01M4/70H01M4/1397H01M4/0404H01M4/136Y02E60/10
Inventor 高野靖男
Owner SAMSUNG SDI CO LTD
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