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Electrode assembly and lithium secondary battery having the same

An electrode assembly and positive electrode technology, which is applied in the field of secondary batteries, can solve the problems of worsening discharge efficiency and reduce battery capacity, and achieve the effect of preventing deterioration of discharge efficiency and achieving excellent discharge efficiency.

Inactive Publication Date: 2011-01-19
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the C rate increases, LiCoO 2 Exhibits degraded discharge efficiency, thus reducing battery capacity with increasing number of charge and discharge cycles

Method used

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  • Electrode assembly and lithium secondary battery having the same
  • Electrode assembly and lithium secondary battery having the same
  • Electrode assembly and lithium secondary battery having the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] LiCoO 2 with TiO 2 and MgCO 3 Mixing and plasticizing the mixture, so that the LiCoO 2 Doping was performed so that the respective contents of Ti and Mg were 0.14 wt% based on 100 wt% of the obtained lithium composite oxide cathode active material. In addition, the positive electrode active material was mixed with polyvinylidene fluoride (PVDF) as a binder and carbon as a conductive agent in a weight ratio of 96:2:2, and dispersed in N-methyl-2-pyrrolidone , to prepare positive electrode slurry. The cathode slurry was coated on a 12 μm thick aluminum foil, dried and rolled to form the cathode.

[0074] Lithium was used as a counter electrode, a 16 μm-thick film separator formed of polyethylene was used between the prepared positive electrode and its counter electrode, and a coin-type half cell was prepared after injecting an electrolytic solution. The electrolyte is a solution of 1.15MLiPF6 dissolved in a mixed solvent of EC / EMC / FB / DMC with a volume ratio of 3 / 5 / 1 / ...

Embodiment 2

[0076] The same process as in Example 1 was performed except that doping was performed so that the Mg content was 0.22 wt% based on 100 wt% of the lithium composite oxide.

Embodiment 3

[0078] The same process as in Example 1 was performed except that doping was performed so that the respective contents of Ti and Mg were 0.18 wt% based on 100 wt% of the lithium composite oxide.

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Abstract

Embodiments of the present invention are directed to electrode assemblies and secondary batteries using the same. The secondary battery includes an electrode assembly including a positive electrode having a positive active material, a negative electrode including a negative active material, and a separator between the positive and negative electrodes. The positive active material includes a lithium composite oxide represented by LiCO1-x-yMgxTiyO2 where 0.0056<=x<=0.0089, and 0.0029<=y<=0.0045. The electrode assembly and the lithium secondary battery including the same show good discharge efficiency even with increases in C-rate, and substantially prevent reductions in battery capacity resulting from battery deterioration, thereby improving battery lifespan.

Description

technical field [0001] The present invention relates to an electrode assembly and a secondary battery having the same. Background technique [0002] In recent years, the rapid development of small and lightweight portable electronic devices has created an increasing demand for high-capacity, small-sized batteries. In particular, lithium ion secondary batteries can provide an operating voltage of at least about 3.6 V, which is about three times higher than that of nickel-chromium batteries or nickel-hydrogen batteries widely used as power sources in portable electronic devices. In addition, lithium ion secondary batteries have a higher energy density per unit weight than nickel-chromium batteries or nickel-hydrogen batteries. Therefore, research on lithium ion secondary batteries has been rapidly conducted. [0003] In lithium-ion secondary batteries, electrical energy is generated because of oxidation and reduction reactions that occur during intercalation / deintercalation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/485H01M10/0583
CPCY02E60/122H01M4/525C01P2002/52C01P2006/40H01M10/052C01G51/42C01P2004/51Y02E60/10Y02P70/50H01M10/058
Inventor 李承法
Owner SAMSUNG SDI CO LTD