Electrode active substance and method for producing same

A technology of electrode active material and manufacturing method, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of insufficient electronic conductivity, reduced capacity, and reduced battery density of phosphate-based electrode active materials

Inactive Publication Date: 2013-11-20
SUMITOMO OSAKA CEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The electron conductivity of this phosphate-based electrode active material is not sufficient. Therefore, in order to perform high-current charge and discharge, it is necessary to perform various operations such as miniaturization of particles and compounding with a conductive material, and many efforts have been made.
[0011] However, in the case of miniaturization of particles and compounding using a large amount of conductive material, there is a problem that the electrode density decreases, which in turn causes the battery density to decrease, that is, the capacity per unit volume decreases.

Method used

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  • Electrode active substance and method for producing same
  • Electrode active substance and method for producing same
  • Electrode active substance and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] A solution in which lithium acetate, iron (III) citrate, and phosphoric acid are dissolved in water at a mass ratio of 1:1:1 is mixed with an aqueous polyvinyl alcohol solution to obtain a uniform solution.

[0105] The concentration of the solution is LiFePO 4 It is 5 mass% in conversion, and 8 mass% in polyvinyl alcohol conversion.

[0106] Then, add 100g of the above LiMnPO to 100g of this solution 4 , And then use a ball mill for dispersion treatment to obtain LiMnPO 4 Of slurry.

[0107] LiMnPO 4 After drying the slurry with a heating dryer, heat treatment was performed at 600° C. for 1 hour in a nitrogen atmosphere to obtain the electrode active material A1 of Example 1.

Embodiment 2

[0109] The electrode active material A2 of Example 2 was obtained in accordance with Example 1, except that lithium acetate was replaced with lithium nitrate, iron (III) citrate was replaced with iron (III) nitrate, and polyvinyl alcohol was replaced with glucose.

Embodiment 3

[0111] Obtain LiMnPO containing LiMnPO according to Example 1 4 Of slurry.

[0112] Then, the LiMnPO-containing 4 The slurry was sprayed and dried in a 150°C atmosphere with a spray dryer.

[0113] Then, the dried product was heat-treated at 600° C. for 1 hour in a nitrogen atmosphere to obtain an electrode active material A3 of Example 3.

[0114] Observation of the particle shape of the electrode active material A3 with a scanning electron microscope (SEM) revealed that it is a spherical secondary particle with an average particle diameter of 10 μm.

[0115] figure 1 The scanning electron microscope (SEM) image of the electrode active material A3 of Example 3 is shown.

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Abstract

The present invention provides an electrode active substance that is obtained by coating the surface of LiwAxDO4 particles (wherein A is at least one selected from the group consisting of Mn and Co, and D is one, two or more selected from the group consisting of P, Si and S, 0<w<=4, and 0<x<=1.5) with a coating layer comprising LiyEZPO4 (wherein E is at least one selected from the group consisting of Fe and Ni, 0<y<=2, and 0<z<=1.5) and a carbonaceous electron-conducting substance. This electrode active substance is obtained by suspending particles formed from LiwAXDO4 in an aqueous solution containing an Li source, E source, PO4 source and carbon source to obtain a slurry, then drying the slurry, and heat treating the product in a non-oxidizing atmosphere.

Description

Technical field [0001] The present invention relates to an electrode active material and a method for manufacturing the same. In detail, it particularly relates to an electrode material suitable for use as a lithium-ion battery, which can achieve load characteristics, cycle characteristics, and energy by using a phosphate-based active material having an olivine structure An electrode active material for a lithium ion battery with excellent density and a method for manufacturing the same. [0002] This application claims priority based on Japanese Patent Application No. 2011-047608 filed in Japan on March 4, 2011, and the content is used in this specification. Background technique [0003] In recent years, non-aqueous electrolyte secondary batteries such as lithium ion batteries have been proposed as batteries that are expected to be reduced in size, weight, and capacity, and have been put into practical use. [0004] Compared with existing lead batteries, nickel-cadmium batteries, n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/45H01M4/36
CPCH01M4/5825H01M4/366H01M4/625H01M4/525C01B25/45H01M4/364H01M4/136Y02E60/122H01M4/131Y02E60/10
Inventor 大野宏次忍足晓
Owner SUMITOMO OSAKA CEMENT CO LTD
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