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Cathode for lithium secondary battery and lithium secondary battery containing same

一种二次电池、负极集电体的技术，应用在二次电池、二次电池制造、电池电极等方向，能够解决电池不良率增加、电池循环性能降低、降低电池安全性等问题，达到降低内部短路发生率、电池安全性提高的效果

Active Publication Date: 2015-01-14
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned dendrites will not only reduce the cycle performance of the battery and increase the defective rate of the battery, but also penetrate the separator due to external pressure or vibration, making the positive electrode / negative electrode connected, thereby causing an internal short circuit of the electrode and reducing the safety of the battery

Method used

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  • Cathode for lithium secondary battery and lithium secondary battery containing same

Examples

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Embodiment

[0046] (Example)

[0047] After preparation of a general positive electrode mixture slurry, coating, drying, and pressure bonding are performed on a long sheet-shaped aluminum foil, whereby a positive electrode sheet is prepared. A negative electrode sheet is prepared by coating, drying, and crimping a common negative electrode active material on a copper foil. The uncoated part of the negative electrode sheet is laser welded to an aluminum metal part. Then, a negative electrode, a separator, a positive electrode, a separator, and a negative electrode are laminated in this order, and then wound up and built into a cylindrical battery case. Inject 1M LiPF into the inside of the battery case 6 Carbonate-based electrolyte, thus preparing a cylindrical battery.

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Abstract

Provided are an anode for a secondary battery including an anode collector, an anode active material coated on the anode collector, and a non-coating portion (anode tab) which protrudes from one side of the anode collector and is not coated with an anode active material, wherein the anode includes a metal member which is bonded to the non-coating portion and has higher reactivity or reducibility with respect to a metal oxide than the anode collector, and a secondary battery including the anode.

Description

technical field [0001] The present invention relates to a negative electrode for a lithium secondary battery capable of preventing dendrite formation in the battery, and a lithium ion secondary battery including the negative electrode. Background technique [0002] Recently, with the research and development of portable electronic devices such as digital cameras, mobile phones, and notebook computers, or high-tech fields such as high-power hybrid vehicles, instead of primary batteries that cannot be recharged as their power sources, rechargeable and discharge secondary battery research is actively underway. [0003] Secondary battery can enumerate nickel-cadmium battery, nickel-metal hydride battery, nickel-hydrogen battery and lithium secondary battery etc., wherein, because lithium secondary battery is compared with nickel-cadmium battery or nickel-metal hydride battery , the operating voltage is more than three times higher (3.6V), and the energy density per unit weight ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/66H01M4/70H01M10/0525H01M50/528H01M50/536H01M50/538
CPCY02E60/122H01M4/661H01M2/263H01M4/13H01M4/662H01M4/70H01M10/0525H01M50/536H01M50/538H01M2300/0017H01M4/667H01M10/0431Y02E60/10Y02P70/50H01M4/66H01M2004/027
Inventor 朴成焌全浩辰金甫炫崔大植朴晶浩尹载植朴勇八崔丞惇康惠辰
Owner LG ENERGY SOLUTION LTD
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