Cathode active material for non-aqueous electrolyte rechargeable battery and manufacturing method thereof

A technology of negative electrode active material and non-aqueous electrolyte, which is applied in the field of negative electrode active material for rechargeable battery with non-aqueous electrolyte and its preparation, can solve the problems such as capacity decline, and achieve the effect of high crystallinity and high capacity

Inactive Publication Date: 2009-01-07
SAMSUNG SDI (TIANJIN) BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this material undergoes a change in oxide structure during charge and discharge, and exhibits a decrease in capacity due to this structural deterioration (Japanese Patent Laid-Open No. 2003-68305)

Method used

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  • Cathode active material for non-aqueous electrolyte rechargeable battery and manufacturing method thereof
  • Cathode active material for non-aqueous electrolyte rechargeable battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0054] figure 2 A flowchart of the preparation method of lithium vanadium oxide according to the conventional method.

[0055] refer to figure 2 , due to Li 1.1 V 0.9 o 2 is stoichiometrically unstable, so when the raw materials are mixed simultaneously and subsequently calcined to obtain Li 1.1 V 0.9 o 2 , a crystalline material with lattice vacancy defects in the crystal lattice results. Li ions can intercalate into the lattice vacancies of lithium vanadium oxide during charge and discharge. Properly intercalated lithium can combine with other atoms to fill lattice vacancies, but unintentionally intercalated lithium ions cause lattice defects. When the lattice defects are stabilized, the balance between atomic bonding can be changed, the interlayer distance will be kept at a uniform distance, or the intercalation and dissociation between the layered structures of lithium vanadium oxides cannot occur due to the electrical repulsion between lithium ions. sites for i...

Embodiment 1

[0069] Will Li 2 CO 3 and V 2 o 3 The mixture was mixed at a molar ratio of 1.0:1.0, and then the mixture was calcined at 1100° C. for 5 hours under a nitrogen atmosphere to prepare lithium vanadium oxide having a layered rock-salt structure as a framework.

[0070] Next, the lithium vanadium oxide with layered rock-salt structure and Li 2 CO 3 Mixed at a molar ratio of 0.9:0.1, and then calcined at 1100°C for 5 hours under a nitrogen atmosphere to obtain lithium vanadium oxide (Li 1.1 V 0.9 o 2 ).

[0071] The lithium vanadium oxide as the negative electrode active material is subjected to XRD (X-ray diffraction) detection under the following conditions to obtain the full width at half maximum of the (003) plane and the peak intensity ratio of the (003) and (104) planes. The results are shown in Table 1 below.

[0072] XRD detection equipment: Rigaku Rint 2000 (Rigaku company)

[0073] Vacuum tube: CuKα1

[0074] Voltage: 50kV

[0075] Current: 300mA

[0076] Sca...

Embodiment 2

[0082] Will Li 2 CO 3 and V 2 o 3 Mixed at a molar ratio of 1.0:1.0, and then calcined at 1100° C. for 5 hours under a nitrogen atmosphere to prepare lithium vanadium oxide with a layered rock-salt structure as a framework. Next, the lithium vanadium oxide with layered rock-salt structure and Li 2 CO 3 and MgC 2 o 4 2H 2 O was mixed at a molar ratio of 0.87:0.1:0.03, and then calcined at 1100°C for 5 hours under a nitrogen atmosphere to obtain lithium vanadium oxide (Li 1.1 Mg 0.03 V 0.87 o 2 ). Then, the battery is prepared in the same manner as in Example 1, except that the lithium vanadium oxide (Li 1.1 Mg 0.03 V 0.87 o 2 ) as the negative electrode active material.

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Abstract

The method of preparing a negative active material for a non-aqueous electrolyte rechargeable battery includes mixing a vanadium compound and a lithium compound and then subjecting the mixture to first firing to obtain Li1.0(VxMy)1.0O2 having a layered halite type structure (where 0.5<=x<=1.0, 0<=y<=0.5, x+y=1, and M is selected from the group consisting of group 2 to 15 elements of the periodic table and combinations thereof); and adding a lithium compound to the Li1.0(VxMy)1.0O2 and then subjecting the resultant to second firing. The negative active material for a non-aqueous electrolyte rechargeable battery prepared according to the preparing method has high crystallinity, excellent charge and discharge characteristics at a high rate, and excellent charge and discharge cycle characteristics.

Description

technical field [0001] The present invention relates to a method for preparing a negative electrode active material for a nonaqueous electrolyte rechargeable battery and the negative electrode active material for a nonaqueous electrolyte rechargeable battery prepared thereby. The present invention more particularly relates to a method for preparing a negative electrode active material having high crystallinity, excellent high-rate charge-discharge characteristics, and excellent charge-discharge cycle life characteristics for non-aqueous electrolyte rechargeable batteries, and the preparation thereof Negative active materials for nonaqueous electrolyte rechargeable batteries. Background technique [0002] For negative active materials of rechargeable lithium batteries, various carbon-based materials such as artificial and natural graphite, hard carbon, etc., have been used, which can intercalate and deintercalate lithium ions. In order to provide high-capacity rechargeable b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01D15/00C01G31/00C01G1/02C04B35/622H01M4/485
CPCY02E60/10C01G31/006C01P2002/74C01P2006/40H01M4/131H01M4/485H01M10/052
Inventor 户北哲生前田英明小林直哉金性洙
Owner SAMSUNG SDI (TIANJIN) BATTERY CO LTD
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