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Composition for negative electrode of non-aqueous rechargeable battery and non-aqueous rechargeable battery prepared by using same

A recharging and battery technology, applied in non-aqueous electrolyte batteries, battery electrodes, vanadium compounds, etc., can solve the problems of poor charging and discharging characteristics, unstable potential, and uneven composition of target materials.

Inactive Publication Date: 2008-07-16
SAMSUNG SDI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when lithium vanadium oxide is prepared by a dry method, the composition of the target material is not uniform, and it is difficult to maintain a stable crystal structure
Therefore, the potential becomes unstable after repeating the charge-discharge cycle, so the charge-discharge characteristics deteriorate after repeating the charge-discharge cycle several times

Method used

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  • Composition for negative electrode of non-aqueous rechargeable battery and non-aqueous rechargeable battery prepared by using same
  • Composition for negative electrode of non-aqueous rechargeable battery and non-aqueous rechargeable battery prepared by using same
  • Composition for negative electrode of non-aqueous rechargeable battery and non-aqueous rechargeable battery prepared by using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The preparation of embodiment 1. lithium vanadium oxide

[0061] lithium carbonate Li 2 CO 3 Lithium compound, vanadium pentoxide V 2 o 5 of vanadium compounds and oxalic acid (COOH) 2 The organic acids of are mixed and reacted in aqueous solution, then evaporated to provide the organic acid salt Li a V b m c o d C 2 o 4 . The molar ratio of lithium to vanadium of lithium carbonate and vanadium pentoxide is 1.22:1, and the organic acid is added in an amount 1.5 times the molar amount required for the reaction with lithium carbonate and vanadium pentoxide.

[0062] The obtained organic acid salt precursor was calcined at 1100° C. under a nitrogen atmosphere to obtain lithium vanadium oxide.

Embodiment 2

[0063] Embodiment 2. Preparation of lithium vanadium oxide

[0064] Lithium vanadium oxide was prepared according to the same process as in Example 1, except that citric acid was used instead of oxalic acid.

Embodiment 3

[0070] Example 3. Fabrication of lithium rechargeable batteries

[0071] For Example 3, 80 wt% of the lithium vanadium oxide prepared in Example 1, 10 wt% of acetylene black and 10 wt% of polyvinylidene fluoride were mixed, and then coated on the negative electrode current collector including copper. The coated negative current collector was then pressed to 1.8 g / cm 3 to provide the negative pole.

[0072] 91wt% LiCoO 2 As a positive electrode active material, 3 wt % of acetylene black and 6 wt % of polyvinylidene fluoride were mixed to provide a positive electrode. Therefore, the solvent of the non-aqueous electrolyte solution includes EC: DEC (ethylene carbonate: diethyl carbonate) = 3: 7 (volume ratio), and the electrolyte includes LiPF 6 .

[0073] Then, an electrolytic solution was injected into the electrode assembly, and the inlet was sealed after the battery was allowed to stand for 1 hour to provide a lithium rechargeable battery.

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Abstract

The present invention relates to a negative material for a non-aqueous rechargeable battery and a non-aqueous rechargeable battery including the same. The negative material for a non-aqueous rechargeable battery includes lithium vanadium oxide that is obtained by mixing a lithium compound such as lithium carbonate (Li 2 CO 3 ) and a vanadium compound such as vanadium pentaoxide (V 2 O 5 ) with anorganic acid such as oxalic acid (COOH) 2 to obtain an organic acid salt precursor and firing the organic acid salt precursor. The negative material for a non-aqueous rechargeable battery can improvecharge and discharge characteristics of a non-aqueous rechargeable battery due to uniform composition.

Description

technical field [0001] The present invention relates to a negative electrode material for a nonaqueous rechargeable battery such as a lithium ion rechargeable battery and a nonaqueous rechargeable battery including the negative electrode material. The present invention more particularly relates to a negative electrode material for a nonaqueous rechargeable battery capable of improving charge and discharge characteristics of the nonaqueous rechargeable battery due to its uniform composition, and a nonaqueous rechargeable battery including the improved negative electrode material. Background technique [0002] Current rechargeable lithium batteries include a positive electrode and a negative electrode that can intercalate and deintercalate lithium ions, respectively, immersed in a non-aqueous electrolyte (see published on March 7, 2003 entitled "Negative Electrode Materials and Applications for Secondary Lithium Batteries"). Claims 3-11 and accompanying drawing 10) in Japanese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/58H01M4/02H01M10/36H01M10/40H01M4/485H01M10/05
CPCY02E60/122Y02E60/10C01G31/00C01P2002/72C01P2002/74C01P2006/40H01M4/131H01M4/485H01M10/0525
Inventor 金性洙前田英明小池将树平村泰章桧山进新开三郎胜见学
Owner SAMSUNG SDI CO LTD