Positive electrode active material for lithium secondary cell and lithium secondary cell

A cathode active material, lithium battery technology, applied in nanotechnology for materials and surface science, battery electrodes, active material electrodes, etc., can solve problems such as reduced discharge capacity

Inactive Publication Date: 2006-01-18
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, studies conducted by the present inventors have shown that even with any of these techniques, the problem of reduction in discharge capacity resulting from repeated charge / discharge cycles has not been resolved.

Method used

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  • Positive electrode active material for lithium secondary cell and lithium secondary cell
  • Positive electrode active material for lithium secondary cell and lithium secondary cell
  • Positive electrode active material for lithium secondary cell and lithium secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] 3L (liter) of water was introduced into the closed reactor. A 32% aqueous sodium hydroxide solution was added thereto to bring the pH to 11.6. The contents were stirred at 1200 rpm with a stirrer having paddle-type stirring blades, and the temperature of the solution in the reactor was maintained at 50° C. with a heater. In addition, argon gas was passed through the solution in order to remove dissolved oxygen.

[0137] On the other hand, a stock solution is prepared. Manganese sulfate (MnSO 4 ) aqueous solution and nickel sulfate (NiSO 4 ) aqueous solution, cobalt sulfate (CoSO 4 ) aqueous solution and hydrazine (NH 2 NH 2 ) aqueous solution is mixed so as to obtain the solution that the manganese concentration is 0.633mol / L, the nickel concentration is 0.563mol / L, the cobalt concentration is 0.563mol / L and the hydrazine concentration is 0.0101mol / L, thus obtaining the raw material ready to use in the present embodiment solution.

[0138] While continuously sti...

Embodiment 2

[0141] Manufacture the Mn-Ni-Co co-precipitation precursor according to the same method as in Example 1, the difference is that the raw material solution used is manganese sulfate (MnSO 4 ) aqueous solution and nickel sulfate (NiSO 4 ) aqueous solution, cobalt sulfate (CoSO 4 ) aqueous solution and hydrazine (NH 2 NH 2 ) aqueous solutions to obtain a solution having a manganese concentration of 0.915 mol / L, a nickel concentration of 0.422 mol / L, a cobalt concentration of 0.422 mol / L and a hydrazine concentration of 0.0101 mol / L. X-ray diffraction analysis reveals that the Mn-Ni-Co coprecipitation precursor mainly contains β-Ni(OH) 2 type crystal structure.

[0142] The obtained Mn-Ni-Co coprecipitated precursor and lithium hydroxide monohydrate powder were weighed so that the atomic ratio Li / (Ni+Mn+Co) was 1.3. In the same manner as in Example 1, a Li-Mn-Ni-Co composite oxide was obtained from the resulting mixture. The thus-obtained Li-Mn-Ni-Co composite oxide was analy...

Embodiment 3

[0144] Manufacture the Mn-Ni-Co co-precipitation precursor according to the same method as in Example 1, the difference is that the raw material solution used is manganese sulfate (MnSO 4 ) aqueous solution and nickel sulfate (NiSO 4 ) aqueous solution, cobalt sulfate (CoSO 4 ) aqueous solution and hydrazine (NH 2 NH 2 ) aqueous solutions to obtain a solution with a manganese concentration of 0.915 mol / L, a nickel concentration of 0.756 mol / L, a cobalt concentration of 0.088 mol / L and a hydrazine concentration of 0.0101 mol / L. X-ray diffraction analysis revealed that the Mn-Ni-Co coprecipitated precursor mainly contained β-Ni(OH) 2 type crystal structure.

[0145] The obtained Mn-Ni-Co coprecipitated precursor and lithium hydroxide monohydrate powder were weighed so that the atomic ratio Li / (Ni+Mn+Co) was 1.1. In the same manner as in Example 1, a Li-Mn-Ni-Co composite oxide was obtained from the resulting mixture. The thus-obtained Li-Mn-Ni-Co composite oxide was analyz...

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Abstract

A positive electrode active material for a lithium secondary cell having a high energy density and excellent in charging / discharging cycle performance, and a lithium secondary cell having a high energy density and excellent in charging / discharging cycle performance are disclosed. A positive electrode active material for a lithium secondary cell is characterized in that the composition of the active material is LixMnaNibCocO2 where a, b, and c are values of a point a, b, c on a side of or inside a quadrilateral ABCD having vertexes A (0.5, 0.5, 0), B (0.55, 0.45, 0,) C (0.55, 0.15, 0.30), and D (0.15, 0.15, 0.7) on a ternary state diagram showing the relationship among a, b, and c, and satisfy the expressions 0.95 H01M 4 / 48 H01M 4 / 58 H01M 4 / 02 H01M 10 / 40 C01G 53 / 00 3 36 2 2002 / 11 / 21 1723576 2006 / 1 / 18 100353596 2007 / 12 / 5 2007 / 12 / 5 2007 / 12 / 5 Yuasa Battery Co., Ltd. Japan Shiozaki Ryuji Fujii Akihiro Okabe Kazuya Nukuda Toshiyuki ding xianglan 11127 San You Patent Agency No.201 Entrance 1, Building 13, the East of Jinmenli, Haidian District, Beijing 100088 Japan 2001 / 11 / 22 358017 / 2001 2004 / 3 / 31 PCT / JP2002 / 012171 2002 / 11 / 21 WO2003 / 044881 2003 / 5 / 30 Japanese

Description

technical field [0001] The present invention relates to positive electrode active materials for lithium storage batteries, and to lithium storage batteries. Background of the invention [0002] Non-aqueous electrolyte batteries represented by lithium secondary batteries are widely used as power sources for small portable terminals, mobile communication equipment, etc., because these batteries have high operating voltage and high energy density. Cathode active materials for lithium batteries are required to stably maintain their crystal structure even when undergoing repeated lithium intercalation / extraction, and to have a large reversible electrochemical capacity. [0003] Currently, with α-NaFeO 2 structure of Li-Co composite oxides (hereinafter referred to as LiCoO 2 represents this composite oxide) is mainly used as a positive electrode active material for lithium secondary batteries. LiCoO 2 It is capable of stably intercalating / extracting lithium ions at an operatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/58H01M4/02H01M10/40C01G53/00C01G45/00H01M4/131H01M4/1391H01M4/485H01M4/50H01M4/505H01M4/52H01M4/525H01M10/0525H01M10/36
CPCH01M4/505C01G53/50H01M4/525C01G53/44H01M10/0525C01P2006/40C01P2002/74C01G51/50C01P2002/60C01P2004/03C01G51/44C01P2002/54H01M4/485C01P2004/61H01M4/1391C01P2006/12C01G45/1228Y02E60/122C01P2002/72H01M4/131C01P2004/64C01P2004/04C01P2004/62B82Y30/00Y02E60/10
Inventor 盐崎龙二藤井明博冈部一弥温田敏之
Owner GS YUASA INT LTD
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