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Positive active material, positive electrode and rechargeable lithium battery

A technology of positive electrode active material and negative electrode active material, which is applied in the field of positive electrode active material and can solve problems such as low electrode density

Inactive Publication Date: 2012-09-19
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, if an electrode is fabricated using an olivine-based cathode active material in the form of nanoparticles for efficient intercalation and deintercalation of lithium ions, the electrode has a low density

Method used

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  • Positive active material, positive electrode and rechargeable lithium battery
  • Positive active material, positive electrode and rechargeable lithium battery
  • Positive active material, positive electrode and rechargeable lithium battery

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Embodiment Construction

[0018] A positive active material according to an embodiment of the present invention includes about 70 wt % to about 99 wt % of a phosphate compound having an olivine structure and about 1 wt % to about 30 wt % of a lithium nickel composite oxide.

[0019] A phosphate compound having an olivine structure can be represented by Formula 1 below:

[0020] Formula 1

[0021] LiMPO 4

[0022] In Formula 1, M includes at least one element selected from Fe, Mn, Ni, Co, and V.

[0023] Phosphate compounds with an olivine structure can be, for example, lithium iron phosphate (LiFePO 4 ). Phosphate compounds with olivine structure can also include lithium iron phosphate (LiFePO 4 ) together as a dopant of heterogeneous elements such as Mn, Ni, Co, V or combinations thereof.

[0024] Phosphate compounds with an olivine structure (e.g., lithium iron phosphate (LiFePO 4 )) due to PO 4 The tetrahedral structure, so it is structurally stable against volume changes caused by charging ...

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Abstract

A positive active material, an electrode including the positive active material, and a lithium battery including the electrode are provided. Due to the inclusion of a phosphate compound having the olivine structure and a lithium nickel composite oxide in the positive active material, the positive active material has high electric conductivity and high electrode density and thus, a lithium battery manufactured using the positive active material has high capacity and good high-rate characteristics.

Description

[0001] This application claims priority to U.S. Provisional Application No. 61 / 451,017, filed March 9, 2011, in the USPTO and U.S. Patent Application No. 13 / 244,392, filed September 24, 2011 in the USPTO rights and interests, the entire contents of these applications are incorporated by reference into this application. technical field [0002] The invention relates to a positive electrode active material, an electrode comprising the positive electrode active material and a lithium battery comprising the electrode. Background technique [0003] Recently, lithium secondary batteries have attracted attention as power sources for small and portable electronic devices. The lithium secondary battery uses an organic electrolyte, and due to the use of the organic electrolyte, the discharge voltage of the lithium secondary battery is twice that of a conventional battery using an aqueous alkali solution. Therefore, lithium secondary batteries have high energy density. [0004] As a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/525
CPCH01M4/5825C01G53/42C01G53/50H01M4/525C01P2006/40C01P2002/54Y02E60/122H01M4/043H01M4/505C01P2004/80H01M4/364H01M10/052C01G51/42H01M2004/021H01M4/13H01M10/0525Y02E60/10H01M4/1315
Inventor 金俊植李宗勋金性洙李栖宰申政淳
Owner SAMSUNG SDI CO LTD
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