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Method of producing active material for lithium secondary battery, method of producing electrode for lithium secondary battery, method of producing lithium secondary battery, and method of monitoring

A technology for lithium secondary batteries and active materials, which is applied in the manufacture and quality supervision of active materials, the manufacture of lithium secondary batteries using the same, and the fields of electrodes for lithium secondary batteries, and can solve the problems of low sensitivity and precision, low battery capacity, etc. Reduction, uneven amount of impurities, etc., to achieve the effect of high quality and high energy density

Inactive Publication Date: 2008-10-01
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in these synthesis methods, sometimes the mixing is insufficient, sometimes the reaction is not uniform, and Li as a raw material 2 CO 3 or Li 3 PO 4 Remains in an unreacted state and remains in the active substance as an impurity
[0006] In addition to reducing the battery capacity due to adverse charge and discharge reactions, such impurities are also the cause of internal short circuits
In addition, there is a problem that if the amount of impurities contained in LiFePO4 is uneven in each production batch, the capacity of the battery manufactured with this LiFePO4 will also vary. uneven
In addition, when washing with distilled water, Li 3 PO 4 or Li 2 CO 3 Problems such as poorly soluble impurities that cannot be removed even after washing
[0010] In addition, the sensitivity and precision of the quantification method for the amount of impurities proposed in International Publication No. 2005 / 051840 pamphlet or Japanese Patent Application Laid-Open No. 2002-117847 are not high, and each production batch of LiFePO 4 The problem of uneven amounts of impurities contained in the

Method used

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  • Method of producing active material for lithium secondary battery, method of producing electrode for lithium secondary battery, method of producing lithium secondary battery, and method of monitoring
  • Method of producing active material for lithium secondary battery, method of producing electrode for lithium secondary battery, method of producing lithium secondary battery, and method of monitoring
  • Method of producing active material for lithium secondary battery, method of producing electrode for lithium secondary battery, method of producing lithium secondary battery, and method of monitoring

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Experimental program
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Effect test

Embodiment 1

[0045]

[0046] A phthalate pH standard solution (pH 4.01) manufactured by Kishida Chemical was used as a cleaning solution. The pH of the cleaning solution at this time was 4.0.

[0047]

[0048] Weigh out Li 3 PO 4 LiFePO 4 100 mg of the sample (sample A) was added with 10 mL of cleaning solution, placed in an ultrasonic pretreatment device, and cleaned by ultrasonic treatment for 1 hour.

[0049]

[0050] In order to remove undissolved samples by washing, the washing liquid after washing was filtered, and the amount of P dissolved in the washing liquid was quantified by inductively coupled high-frequency plasma emission spectrometry (ICP emission spectrometry).

[0051] The dissolved amount was calculated by the following calculation formula.

[0052] P dissolved amount (wt%) = (P dissolved in the cleaning solution (mg) × 100) / sample amount (mg)

[0053] In addition, in order to determine the pH of the cleaning solution after cleaning, the pH of the cleaning so...

Embodiment 2

[0055] Acetic acid and sodium acetate were mixed at a weight ratio of 1:1, pure water was added thereto, and a 1.0 wt% aqueous solution of the mixture was prepared as a cleaning solution. The pH of the cleaning solution at this time was 4.5. Except for using this cleaning solution, the sample was washed in the same manner as in Example 1, the amount of P dissolved in the cleaning solution was quantified, and the pH of the cleaning solution was measured.

Embodiment 3

[0057] Acetic acid and sodium acetate were mixed at a weight ratio of 1:10, pure water was added thereto, and a 1.0 wt% aqueous solution of the mixture was prepared as a cleaning solution. The pH of the cleaning solution at this time was 5.6. Except for using this cleaning solution, the sample was washed in the same manner as in Example 1, the amount of P dissolved in the cleaning solution was quantified, and the pH of the cleaning solution was measured.

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Abstract

A method of producing an active material for a lithium secondary battery, by which impurities causing problems in synthesizing an active material for a lithium secondary battery, including a lithium transition metal oxyanion compound are removed efficiently and enhancement of an energy density is realized, is provided. By cleaning the active material for a lithium secondary battery, including a lithium transition metal oxyanion compound, with a pH buffer solution, for example, it is possible to efficiently remove just only impurities such as Li3PO4 or Li2CO3, or a substance, other than LiFePO4, in which the valence of Fe is bivalent such as FeSO4, FeO or Fe3(PO4)2 without dissolving Fe of LiFePO4.

Description

technical field [0001] The present invention relates to a method for manufacturing an active material for a lithium secondary battery, a method for manufacturing an electrode for a lithium secondary battery, a method for manufacturing a lithium secondary battery, and a method for monitoring the quality of an active material for a lithium secondary battery. It is characterized in that the amount of impurities in the active material is reduced by washing the active material containing the lithium transition metal oxyanion compound with a pH buffer solution, thereby achieving high quality and high energy density. Background technique [0002] As a non-aqueous electrolyte secondary battery, LiCoO is usually used 2 It is used as a positive electrode, and lithium metal or lithium alloy or a carbon material capable of absorbing and releasing lithium is used as a negative electrode. In addition, as a non-aqueous electrolyte, LiBF dissolved in an organic solvent such as ethylene carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/48H01M4/58C01B25/45H01M10/40H01M10/38H01M10/052H01M10/0525H01M10/0566H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor D·Y·M·于堂上和范吉田智一门畑哲郎村田彻行松田茂树
Owner SANYO ELECTRIC CO LTD
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