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Boric acid compound, positive electrode for secondary battery, and method for manufacturing secondary battery

A technology of boric acid compound and manufacturing method, which is applied in electrode manufacturing, boron compound, boron oxide compound, etc., can solve the problems of increased manufacturing cost and large amount of gas generated, and achieves the effect of excellent reliability

Inactive Publication Date: 2012-10-24
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The production method described in Non-Patent Document 1 uses expensive oxalate as a compound containing atom M, and there is LiMBO 3 The manufacturing cost increases such conundrum
In addition, the amount of gas generated accompanying the decomposition of raw materials is large

Method used

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  • Boric acid compound, positive electrode for secondary battery, and method for manufacturing secondary battery
  • Boric acid compound, positive electrode for secondary battery, and method for manufacturing secondary battery
  • Boric acid compound, positive electrode for secondary battery, and method for manufacturing secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~11）

[0154] Weigh ferric oxide (Fe 3 o 4 ), manganese dioxide (MnO 2 ), cobalt tetroxide (Co 3 o 4 ), nickel oxide (NiO) and boron oxide (B 2 o 3 ), making it the composition of the first compound shown in Table 1, respectively, to obtain a raw material mixture, which was pulverized by dry method. These pulverized materials were respectively filled in platinum alloy crucibles containing 20% ​​by mass rhodium. Next, this crucible was placed in an electric furnace (manufactured by Motoyama Co., Ltd., device name: NH3045F) equipped with a heating element made of molybdenum silicide. Make N at a flow rate of 2L / min 2 The electric furnace was heated at 1350° C. for 0.5 hour while the gas was circulated. It was confirmed visually that it became transparent, and each melt was obtained.

[0155] Next, the melt in the crucible was passed through double rollers made of stainless steel with a diameter of about 15 cm at 400 revolutions per minute, thereby 5 °C / sec speed cooling to ob...

Embodiment 12~13）

[0160] with Fe 2 B 2 o 5 is the first compound, Li 2 CO 3 As the second compound, it was pulverized in the same manner as in Example 1 so that the molar ratio based on these oxides was 1:0.8 (Example 12) and 1:1.2 (Example 13), and the pulverized product was divided into 3% by volume h 2 -Ar gas, heated at 600°C for 8 hours to obtain 0.8 MB O 2.9 and Li 1.2 MB O 3.1 Boronic acid compound particles of the composition shown.

[0161] When identifying the mineral phase of each particle obtained with an X-ray diffraction device, the particles obtained in Examples 1 to 8, 12 and 13 obtained a similarity to that of the existing LiFeBO 3 (PDF number 01-070-8321) and / or LiMnBO 3 (PDF number 01-053-0371) similar to the diffraction pattern. In addition, the particles obtained in Examples 9-11 obtained the same properties as the existing LiFeBO 3 (PDF number 01-070-8321) similar to the diffraction pattern. LiMBO obtained by heating at 600°C for 8 hours in Examples 1 to 6 3 ...

Embodiment 14~19）

[0165] The flaky cured products obtained in Examples 1 to 6 were preliminarily crushed by dry method, and were blended with lithium carbonate (the second compound) so that the molar ratio based on the oxide was 1:1, thereby obtaining a blend, and then, Carbon black was added to the blend so that the mass ratio of the blend to carbon black was 90:10. This was pulverized by a wet method in the same manner as in Example 1. Put each pulverized product in N 2 In gas, heating at 600°C for 8 hours, thus obtaining carbon-containing, LiMBO 3 Boronic acid compound pellets of the indicated composition.

[0166] When using the X-ray diffraction device to identify the mineral phases of the obtained particles, all obtained the same as the existing LiFeBO 3 (PDF number 01-070-8321) and / or LiMnBO 3 (PDF number 01-053-0371) similar to the diffraction pattern. Furthermore, when measuring the carbon content of the boric acid compound particles obtained in Examples 14, 16 and 19 with a carbo...

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Abstract

Disclosed is a method for producing a boric acid compound, by which a boric acid compound having excellent characteristics and reliability can be produced by a simple procedure at low cost. Specifically, a first compound that has a composition represented by MxByOz (wherein M represents at least one kind of atom selected from among Fe, Mn, Co and Ni, the valence N1 of M satisfies +2 = N1 = +4, and 0.8 = x / y = 1.2) and a second compound that contains at least one kind of atom A selected from among Li, Na and K are blended so that the atomic ratio among A, M and B (A:M:B) is a:b:1 (provided that 0 < a < 2 and 0.8 < b < 1.2). After mixing and pulverizing the blend of the first compound and the second compound, the resulting product is heated in an inert gas or a reducing gas, thereby producing a boric acid compound that has a composition represented by AaMbBOc (wherein the valence of M is equal to or less than N1, and c represents a number that is dependent on the numbers of a and b and the valence of M).

Description

technical field [0001] The present invention relates to a method for producing a boric acid compound, a positive electrode for a secondary battery, and a method for producing a secondary battery. Background technique [0002] In recent years, lithium ion secondary batteries have been widely used as power sources for portable electronic devices such as mobile phones and notebook computers, electric tools, and the like. As a next-generation positive electrode material for lithium-ion secondary batteries, a boric acid compound with an olivine-type crystal structure has been proposed and its production method has been studied from the viewpoints of resources, safety, cost, and stability. [0003] In Patent Document 1, it is described that M 2-2x B 2x o 3 (M is one or two or more metal atoms selected from transition metals, and x is 0<x<1), an electrode active material mainly composed of an amorphous metal complex, as its production method, describes M 2-2x B 2x o 3 ...

Claims

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Application Information

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IPC IPC(8): C01B35/12H01M4/58
CPCH01M4/0471H01M4/5825C01B35/126H01M4/0483C01P2004/61C01B35/127Y02E60/122C01P2002/72C01B35/128C01P2004/64H01M10/052H01M4/1397C01P2004/62B82Y30/00H01M4/136Y02E60/10C01B35/12H01M4/58
Inventor 别府义久
Owner ASAHI GLASS CO LTD
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