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Positive electrode active material, production method thereof and non-aqueous electrolyte secondary battery

A positive electrode active material and non-aqueous electrolyte technology, applied in the field of non-aqueous electrolyte secondary batteries, can solve problems such as poor capacity and poor overcharge cycle life

Inactive Publication Date: 2007-06-20
PANASONIC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the outer cells in the assembled battery have greater polarization, and thus create a capacity difference between the outer and inner cells, which causes poor overcharge cycle life of the assembled battery

Method used

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  • Positive electrode active material, production method thereof and non-aqueous electrolyte secondary battery
  • Positive electrode active material, production method thereof and non-aqueous electrolyte secondary battery
  • Positive electrode active material, production method thereof and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0270] Three different types of cathode active material samples were prepared under the synthesis conditions shown in section (3) above. The [Ni 1 / 4 mn 3 / 4 ](OH) 2 and LiOH·H 2 O Thoroughly mix the resulting mixture to form particles, which are then fired to obtain a positive electrode active material. Therefore, the composition of the resulting cathode active material is Li[Ni 1 / 2 mn 3 / 2 ]O 4 . Oxygen content varies according to synthesis conditions. The electrochemical analysis of the obtained cathode active material was performed in the manner shown in the above section (1).

preparation Embodiment 1

[0272] The ambient temperature was increased from room temperature to 1000°C in approximately 3 hours, maintained at 1000°C for 12 hours, and then decreased from 1000°C to room temperature in 2 hours.

preparation Embodiment 2

[0274] Increase ambient temperature from room temperature to 1000°C in approximately 3 hours, maintain at 1000°C for 12 hours, decrease from 1000°C to 700°C in 30 minutes, maintain at 700°C for 48 hours, then increase from 700°C in 1.5 hours °C was lowered to room temperature.

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Abstract

In order to provide a 3V level non-aqueous electrolyte secondary battery with a flat voltage and excellent cycle life at a high rate with low cost, the present invention provides a positive electrode represented by the formula: Li<2+-ALPHA>[Me]<4>O<8-X>, wherein 0<=alpha<0.4, 0<=x<2, and Me is a transition metal containing Mn and at least one selected from the group consisting of Ni, Cr, Fe, Co and Cu, said active material exhibiting topotactic two-phase reactions during charge and discharge.

Description

technical field [0001] The present invention relates to a positive electrode active material and a nonaqueous electrolyte secondary battery using the positive electrode active material. Background technique [0002] Nonaqueous electrolyte secondary batteries used as power sources for mobile communication devices and portable electronic devices in recent years are characterized by high electromotive force and high energy density. Examples of positive electrode active materials for nonaqueous electrolyte secondary batteries include lithium cobalt oxide (LiCoO 2 ), lithium nickel oxide (LiNiO 2 ), manganese spinel (LiMn 2 o 4 )Wait. These active materials have a voltage of not lower than 4V with respect to lithium. On the other hand, a carbon material is generally used in the negative electrode, which is combined with the above-mentioned positive electrode active material to obtain a 4V level lithium ion battery. [0003] There is an increasing demand for batteries with n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01D15/00C01G1/02B01J19/00H01M10/40H01M4/505H01M4/525H01M10/0525
CPCY02E60/12Y02E60/122Y02E60/10H01M4/505H01M10/0525C01G45/006H01M4/131C01P2006/40C01P2004/62C01P2004/61H01M4/1391H01M4/04H01M4/0471H01M10/42H01M4/485H01M4/661H01M10/0564H01M50/414H01M2004/028H01M2004/021H01M2010/4292Y02P70/50
Inventor 小槻勉芳泽浩司永山雅敏越名秀
Owner PANASONIC CORP
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