Positive electrode material for non-aqueous electrolyte lithium ion battery and battery using the same

A technology of lithium-ion batteries and non-aqueous electrolytes, applied in battery electrodes, secondary batteries, secondary battery manufacturing, etc., can solve problems such as electrolyte decomposition

Active Publication Date: 2007-02-14
ENVISION AESC JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, a Li-Ni battery using a positive electrode material (only referred to as a Li-Ni positive electrode material) containing such a Li-Ni oxide as a positive electrode active material has oxygen ions oxidized to oxygen radicals by high-valent nickel ions in the positive electrode material. And release the oxygen free radicals to decompose the electrolyte

Method used

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  • Positive electrode material for non-aqueous electrolyte lithium ion battery and battery using the same
  • Positive electrode material for non-aqueous electrolyte lithium ion battery and battery using the same
  • Positive electrode material for non-aqueous electrolyte lithium ion battery and battery using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-42、85、86 and comparative example 1 and 2

[0118] 1. Preparation of Cathode

[0119] First, if Figure 10 and 11 As shown, substances (Examples 1-42, 85 and 86) and Li-Ni oxide ( Comparative Example 1-2, Li compound was not deposited). A slurry was prepared by adding N-methyl-2-pyrrolidone as a solvent, stirring 75% by mass of Li-Ni oxide, 10% by mass of acetylene black as a conductive material, and 15% by mass of polyvinylidene fluoride. This slurry was covered with an applicator on an aluminum foil (thickness: 20 μm) as a positive electrode current collector, and heated and dried in a vacuum dryer at about 80° C. Next, electrodes with a diameter of 15 mm were punched out from the aluminum foil, and then dried at 90° C. under high vacuum for 6 hours. The thickness of the punched positive electrode active material layer was 50 μm. As for the method of covering the Li-Ni oxide with the Li compound, the Li-Ni oxide was covered with the Li compound so as to have a covering thickness of 500 nm by a mechanical melting ...

Embodiment 43-84、87、88 and comparative example 3 and 4

[0127] First, if Figure 12 and 13 As shown, substances each containing a Li compound deposited so as to be sprayed on the surface of Li-Ni oxide (average particle diameter: 8 μm) such that its volume was 1 volume relative to 100 volumes of Li-Ni oxide were prepared (Example 43-84, 87 and 88). Also, Li—Ni oxide (average particle diameter: 8 μm) was prepared (Comparative Examples 3 and 4, no Li compound was deposited). Except for this, positive and negative electrodes and batteries were prepared and evaluated in the same manner as in Examples. The results obtained are shown in Figure 12 and 13 middle.

[0128] from Figure 10 to Figure 13 It can be confirmed that, compared with each comparative example in which the Li compound is not deposited on the surface of the Li-Ni oxide, in any of the examples including the substance in which the Li compound is deposited on the surface of the Li-Ni oxide as the positive electrode material, it is possible to Suppresses battery swe...

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Abstract

PROBLEM TO BE SOLVED: To provide a positive electrode material for a nonaqueous electrolyte lithium ion battery, which can suppress a decomposition of an electrolyte even when moisture does not enter a cell and a battery is charged or discharged at high temperature.SOLUTION: The positive electrode material for a nonaqueous electrolyte lithium ion battery includes lithium-nickel oxide having a surface covered with an Li compound to be attached. The Li compound is at least one selected from the group consisting of lithium phosphate, an LiPON compound, an Li<SB POS="POST">2< / SB>O-B<SB POS="POST">2< / SB>O<SB POS="POST">3< / SB>compound, an Li<SB POS="POST">2< / SB>O-B<SB POS="POST">2< / SB>O<SB POS="POST">3< / SB>-LiI compound, an Li<SB POS="POST">2< / SB>S-SiS<SB POS="POST">2< / SB>compound, an Li<SB POS="POST">2< / SB>S-SiS<SB POS="POST">2< / SB>-Li<SB POS="POST">3< / SB>PO<SB POS="POST">4< / SB>compound, lithium hydroxide, lithium fluoride, lithium acetate, lithium acetylide ethylenediamine, lithium benzoate, lithium bromide, lithium carbonate, lithium nitrate, lithium oxalate, lithium pyruvate, lithium stearate, lithium tartrate and lithium sulfate.

Description

technical field [0001] The invention relates to a positive electrode material of a non-aqueous electrolyte lithium ion battery using lithium nickel oxide (Li-Ni oxide) as a positive electrode active material, and to a non-aqueous electrolyte lithium ion battery using the positive electrode material. Background technique [0002] Currently, lithium ion secondary batteries have been commercialized as nonaqueous electrolyte secondary batteries for portable devices such as mobile phones. As the weight and thickness of portable devices decrease, non-aqueous electrolyte lithium ion secondary batteries themselves need to be thinner. Recently, thin batteries using laminated thin films as casing materials have been developed, and laminated thin batteries are being put into practical use, in which the positive electrode active material is lithium cobalt oxide (LiCoO 2 ), the negative electrode active material is a graphite material or a carbon material, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/58H01M10/36H01M4/131H01M4/525H01M10/04H01M10/42
CPCY02E60/12Y02E60/122Y02E60/10Y02P70/50
Inventor 伊藤孝宪斋藤崇实堀江英明
Owner ENVISION AESC JAPAN LTD
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