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Negative active material for non-aqueous electrolyte battery,method of preparing same and non-aqueous electrolyte battery

A technology of negative electrode active material and non-aqueous electrolyte, applied in the field of preparing the negative electrode active material and lithium secondary battery, can solve the problem that the use of amorphous tin oxide cannot be well accepted and the like

Inactive Publication Date: 2006-06-07
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These difficulties prevent the use of amorphous tin oxide in batteries from being well accepted

Method used

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  • Negative active material for non-aqueous electrolyte battery,method of preparing same and non-aqueous electrolyte battery
  • Negative active material for non-aqueous electrolyte battery,method of preparing same and non-aqueous electrolyte battery
  • Negative active material for non-aqueous electrolyte battery,method of preparing same and non-aqueous electrolyte battery

Examples

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preparation example Construction

[0042] A method for producing the negative electrode active material of the present invention is now described. First, a vanadium-containing source, a lithium-containing source, and a metal-containing source are mixed in a solid phase. Adjust the mixing ratio of vanadium-containing source, lithium-containing source and metal-containing source to an appropriate range.

[0043] Vanadium-containing sources can be one or more of the following substances: vanadium metal, VO, V 2 o 3 , V 2 o 4 , V 2 o 5 , V 4 o 7 、VOSO 4 ·nH 2 O, NH 4 VO 3 Wait.

[0044] The lithium-containing source may be one or more of lithium carbonate, lithium hydroxide, lithium nitrate and lithium acetate.

[0045] The metal-containing source may be one or more of an oxide or hydroxide comprising at least one of the following metals: Al, Cr, Mo, Ti, W, and Zr. Examples of metal containing sources include, but are not limited to Al(OH) 3 、Al 2 o 3 、Cr 2 o 3 、MoO 3 、TiO 2 、WO 2 or ZrO 2 . ...

Embodiment 1

[0072] Li in the solid phase 2 CO 3 , V 2 o 3 and TiO 2 Mixing was performed at a Li:V:Ti molar ratio of 1.1:0.89:0.01. The mixture was heat-treated at a temperature of 1100 °C under a nitrogen atmosphere to prepare the negative active material, Li 1.1 V 0.89 Ti 0.01 o 2 . The as-prepared negative active material exhibits the R-3M crystalline structure in the single-phase diffraction pattern.

[0073] 80 wt% of the prepared negative active material, 10 wt% graphite conductive agent and 10 wt% polyvinylidene fluoride (PVDF) binder were mixed in N-methylpyrrolidone (NMP) to prepare negative active material slurry. This slurry was coated on a copper current collector to fabricate a negative electrode. The resulting active material had a density of 2.4 grams per cubic centimeter (g / cc). The active material is a mixture of active material, conductive agent and binder formed on the current collector.

[0074] The negative electrode showed a high initial reversible capaci...

Embodiment 2

[0076] Adopt the same method as in Example 1 to prepare the negative electrode active material and negative electrode, the difference is that the molar ratio of Li: V: Ti is changed to 1.1: 0.87: 0.03 to prepare the negative electrode active material, Li 1.1 V 0.87 Ti 0.03 o 2 .

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Abstract

Negative active materials include vanadium-based oxides to achieve outstanding safety and cycle life characteristics in non-aqueous lithium secondary batteries. A small portion of vanadium is replaced by the second metal to improve the stability of the vanadium-based oxide lattice and maintain the capacity of the negative electrode active material. When measuring the extended X-ray absorption fine structure, the free edge energy peak of the negative active material is between about 5350 eV and about 5530 eV.

Description

technical field [0001] The present invention relates to a negative electrode active material for a non-aqueous electrolyte lithium secondary battery having good safety and cycle life characteristics, a method for preparing the negative electrode active material, and a lithium secondary battery comprising the negative electrode active material . Background technique [0002] Recently, due to the reduction in size and weight of portable electronic devices and the demand for batteries with high energy density and high power density, the use of lithium secondary batteries as power sources for electronic devices has increased. A lithium secondary battery using an organic electrolyte solution has demonstrated a high energy density and a discharge voltage more than twice that of a conventional battery using an alkaline aqueous solution as an electrolyte solution. [0003] Oxides including lithium and transition metals capable of intercalating lithium, such as LiCoO 2 , LiMn 2 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G1/02C01G31/00H01M4/02H01M4/04H01M4/485H01M10/05
CPCC01G31/00C01G31/006C01P2006/40H01M4/131H01M4/485H01M10/0525Y02E60/10H01M4/04H01M4/48
Inventor 金性洙新田芳明内多斯基纳·塔提安娜·I李在喆
Owner SAMSUNG SDI CO LTD
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