Porous electrode and lithium secondary cell having same

A technology for lithium secondary batteries and porous electrodes, which is applied in the field of lithium secondary batteries with porous electrodes, can solve the problems of insufficient strength, weakened current collecting ability of the current collector, and easy damage during preparation or use, and achieves the pore size. Small, beneficial to lithium ion migration, and the effect of improving capacitance and current collection performance

Inactive Publication Date: 2005-02-16
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned electrode structure is only applicable to granular electrode materials; and the thickness of the current collector substrate 201 is limited to 80 microns or less, resulting in insufficient strength and easy damage during preparation or use; adjacent protrusions The distance between the burrs 203 is also limited, which easily leads to the weakening of the current collecting ability of the current collector, or the insufficient bonding strength between the electrode material and the base of the current collector, so that the electrode material is easy to fall off during the preparation process.

Method used

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  • Porous electrode and lithium secondary cell having same
  • Porous electrode and lithium secondary cell having same
  • Porous electrode and lithium secondary cell having same

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Embodiment Construction

[0019] Such as figure 1 As shown, the first embodiment of the porous electrode structure of the present invention includes: a metal substrate 10, which can be used as a current collector, and has a bottom end (not shown), and a plurality of hole walls extending vertically outward from the bottom end 12, and a plurality of pores 14 formed between the pore walls 12, the pores 14 have a predetermined pore size, extend from the closed bottom end of the substrate 10 in the same direction, and the other end is an opening, between adjacent pores 14 Separated by hole walls 12; carbon nanotubes 22 are filled in the holes 14 as negative electrode active materials.

[0020] The cross-sectional shape of the pores 14 can be circular, elliptical, triangular or polygonal, and its shape and size can be determined according to the size of the filler and the preparation process. If the shape and size are too large, the available pores of the same volume of the substrate will The reduction in t...

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Abstract

Porous electrode includes current collection body and an electrode active material. The current collection body includes a base and multiple holes inside the base. One end of hole is open end and the other end is closed. Electrode active material is filled into multiple holes, which makes surface area of electrode increase so as to raise electric capacity of battery and performance current collection. Electrode active material ordered arrangement in holes is in favor of migration of lithium ion. In the invention, holes are in small size. Thus, filled electrode active material is not easy to escape from current collection body. The invention also discloses lithium secondary battery possessing porous electrode.

Description

【Technical field】 [0001] The present invention relates to lithium secondary batteries, in particular lithium secondary batteries having porous electrodes. 【Background technique】 [0002] A battery is a device that converts chemical energy into electrical energy. Battery products have developed from early lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride batteries to current lithium batteries. Among them, nickel-cadmium batteries are gradually replaced by lithium batteries due to environmental pollution problems. At present, lithium batteries are divided into primary lithium batteries and rechargeable lithium batteries. Rechargeable lithium batteries are lithium secondary batteries. The biggest difference from traditional batteries is that they use organic solutions instead of aqueous solutions as electrolytes. [0003] Lithium secondary batteries are used in a wide range of applications, mainly including consumer electronic products (Consumer Electroni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/48H01M4/58H01M4/64H01M4/66H01M4/70H01M4/74H01M4/76H01M10/38H01M10/40
CPCH01M4/70Y02E60/122H01M4/13H01M10/058H01M4/76H01M4/742Y02E60/10Y02P70/50
Inventor 黄文正
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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