Positive electrode active material for lithium secondary battery, electrode for lithium secondary battery, and lithium secondary battery

一种正极活性物质、锂二次电池的技术，应用在电池电极、锂蓄电池、非水电解质蓄电池等方向，能够解决没有具体的记载、保存性能没有启示等问题，达到优异保存性能的效果

Inactive Publication Date: 2012-07-25
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

)” (claim 1), and also states that “in the above formula, M is at least one transition metal selected from Fe, Co, Mn, Ni, V, Cu and Ti” (claim 2) , "In the above formula, A is from Ti(4+), Al(3+), B(3+), Zr(4+), Sn(4+), V(4+), Pb(4+) and Ge(4+)" (claim 3), but there is no specific record for making M to be V and making A to be B(3+), and in addition, there is no suggestion for storage performance

Method used

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  • Positive electrode active material for lithium secondary battery, electrode for lithium secondary battery, and lithium secondary battery
  • Positive electrode active material for lithium secondary battery, electrode for lithium secondary battery, and lithium secondary battery
  • Positive electrode active material for lithium secondary battery, electrode for lithium secondary battery, and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Equivalent to the general formula Li 3 V 2 (PO 4 ) 3-x (BO 3 ) x Li in x=1 / 4 3 V 2 (PO 4 ) 11 / 4 (BO 3 ) 1 / 4 Synthesis

[0052] Weigh lithium hydroxide monohydrate (LiOH·H 2 O), ammonium vanadate (NH 4 VO 3 ), citric acid monohydrate, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and boric acid (H 3 BO 3 ), so that LiOH H in molar ratio 2 O: NH 4 VO 3 : Citric acid monohydrate: NH 4 h 2 PO 4 :H 3 BO 3 =3.03:2:1.5:11 / 4:1 / 4. These were added to purified water in the order described and stirred, and each raw material was confirmed to be dissolved each time it was added. Next, the solvent was removed on a hot plate at 80° C. to obtain a precursor. It was thoroughly pulverized with an automatic mortar. Put this precursor into a saggar made of alumina (outer dimensions: 90×90×50 mm), and use an atmosphere displacement firing furnace (Denken’s desktop vacuum gas displacement furnace KDF-75), under the flow of nitrogen gas (flow rate 1.0 l / min) for...

Embodiment 2

[0054] Equivalent to the general formula Li 3 V 2 (PO 4 ) 3-x (BO 3 ) x Li in x=1 / 8 3 V 2 (PO 4 ) 23 / 8 (BO 3 ) 1 / 8 Synthesis

[0055] In addition to weighing lithium hydroxide monohydrate (LiOH·H 2 O), ammonium vanadate (NH 4 VO 3 ), citric acid monohydrate, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and boric acid (H 3 BO 3 ) so that the molar ratio is LiOH·H 2 O: NH 4 VO 3 : Citric acid monohydrate: NH 4 h 2 PO 4 :H 3 BO 3 =3.03:2:1.5:23 / 8:1 / 8, the positive electrode active material for lithium secondary batteries was synthesized similarly to Example 1. Let this be the active substance a2 of the present invention.

Embodiment 3

[0057] Equivalent to the general formula Li 3 V 2 (PO 4 ) 3-x (BO 3 ) x Li in x=1 / 16 3 V 2 (PO 4 ) 47 / 16 (BO 3 ) 1 / 16 Synthesis

[0058] In addition to weighing lithium hydroxide monohydrate (LiOH·H 2 O), ammonium vanadate (NH 4 VO 3 ), citric acid monohydrate, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and boric acid (H 3 BO 3 ) so that the molar ratio is LiOH·H 2 O: NH 4 VO 3 : Citric acid monohydrate: NH 4 h 2 PO 4 :H 3 BO 3 Except =3.03:2:1.5:47 / 16:1 / 16, the cathode active material for lithium secondary batteries was synthesized in the same manner as in Example 1. Let this be the active substance a3 of the present invention.

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Abstract

Disclosed are: a Li3V2(PO4)3-type positive electrode active material for a lithium secondary battery, which has high discharge capacity and excellent storage performance, particularly excellent storage performance at higher temperatures; and a lithium secondary battery utilizing the positive electrode active material. Specifically disclosed are: a positive electrode active material for a lithium secondary battery, which is characterized by being represented by general formula Li3V2(PO4)3-x(BO3)x (wherein x is more than 0 and not more than 2-2, preferably falls within the range from 2-7 to 2-3 inclusive); a positive electrode for a lithium secondary battery, which comprises the positive electrode active material; and a lithium secondary battery equipped with the positive electrode.

Description

technical field [0001] The present invention relates to Li which can be used as positive electrode active material for lithium secondary battery 3 V 2 (PO 4 ) 3 series compound and a lithium secondary battery using the same. Background technique [0002] In recent years, non-aqueous electrolyte secondary batteries represented by lithium secondary batteries with high energy density, low self-discharge, and good cycle characteristics have attracted attention as power sources for portable devices such as mobile phones and notebook computers, and for electric vehicles. . The current mainstream of lithium secondary batteries is small consumer batteries mainly for mobile phones of 2Ah or less. As a positive electrode active material for lithium secondary batteries, numerous positive electrode active materials have been proposed, the most common of which is lithium cobalt oxide (LiCoO) with an operating voltage near 4V. 2 ), lithium nickel oxide (LiNiO 2 ), or lithium mangan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B35/14
CPCC01P2006/12H01M4/5825C01B35/143Y02E60/122H01M4/625C01B35/1027Y02T10/7011H01M10/052C01B35/121H01M4/366H01M2004/021C01P2004/51H01M4/136Y02E60/10H01M4/381H01M4/382H01M4/40H01M4/405Y02T10/70
Inventor 藤野有希子安永好伸田渊彻稻益德雄温田敏之
Owner GS YUASA INT LTD
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