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Mixed active material for lithium secondary battery, electrode for lithium secondary battery, lithium secondary battery, and power storage device

A lithium secondary battery, active material technology, applied in the direction of active material electrodes, battery electrodes, lithium batteries, etc.

Active Publication Date: 2017-10-31
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LiCoO 2 The discharge capacity is about 120 ~ 130mAh / g

Method used

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  • Mixed active material for lithium secondary battery, electrode for lithium secondary battery, lithium secondary battery, and power storage device
  • Mixed active material for lithium secondary battery, electrode for lithium secondary battery, lithium secondary battery, and power storage device
  • Mixed active material for lithium secondary battery, electrode for lithium secondary battery, lithium secondary battery, and power storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0110] (Embodiment 1) [Production of lithium-excess type lithium-transition metal composite oxide]

[0111] Weigh 14.08 g of cobalt sulfate 7 hydrate, 21.00 g of nickel sulfate 6 hydrate, and 65.27 g of manganese sulfate 5 hydrate, and dissolve all of them in 200 ml of ion-exchanged water to make the molar ratio of Co:Ni:Mn 12.5 : 20.0: 67.5 in 2.0 M sulfate solution in water. On the other hand, inject 750ml of ion-exchanged water into a 2L reaction tank to make CO 2 The gas was bubbled for 30 min, thereby making the CO 2 Dissolved in ion-exchanged water. The temperature of the reaction tank was set at 50° C. (±2° C.), and the reaction tank was stirred at a rotation speed of 700 rpm using a paddle blade equipped with a stirring motor, and the above-mentioned sulfate solution was added dropwise at a rate of 3 ml / min. Here, an aqueous solution containing 2.0M sodium carbonate and 0.4M ammonia was appropriately added dropwise from the start to the end of the dropwise addition,...

Embodiment approach 2

[0119] In LiMeO 2 In the acid treatment process of type lithium transition metal composite oxide, LiCo 0.33 Ni 0.33 mn 0.33 o 2 The mixed active material of Embodiment 2 was produced in the same manner as in Embodiment 1 except that the concentration of the sulfuric acid aqueous solution was changed from 0.5M to 1.0M.

Embodiment approach 3

[0121] In LiMeO 2 In the acid treatment process of type lithium transition metal composite oxide, LiCo 0.33 Ni 0.33 mn 0.33 o 2 Except having changed the concentration of the sulfuric acid aqueous solution from 0.5M to 1.5M, it carried out similarly to Embodiment 1, and produced the mixed active material of Embodiment 3.

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Abstract

Provided is a mixed active material for a lithium secondary battery, which includes a lithium transition metal composite oxide having an α-NaFeO2 structure with the transition metal (Me) including Co, Ni and Mn and the Mn / Me molar ratio being more than 0.5, and a lithium transition metal composite oxide having an α-NaFeO2 structure with the transition metal (Me) including Co, Ni and Mn and the Mn / Me molar ratio being more than 0 and not more than 0.5, wherein the mixed active material has a specific surface area of 4.4 m2 / g or less and a S content of 0.2 to 1.2% by mass.

Description

technical field [0001] The present invention relates to a mixed active material for a lithium secondary battery, an electrode for a lithium secondary battery containing the mixed active material, a lithium secondary battery including the electrode, and an electrical storage device comprising the battery. Background technique [0002] Currently, non-aqueous electrolyte secondary batteries typified by lithium ion secondary batteries, especially lithium secondary batteries, are widely installed in mobile terminals and the like. These non-aqueous electrolyte secondary batteries mainly use LiCoO 2 as a positive electrode active material. However, LiCoO 2 The discharge capacity of battery is about 120~130mAh / g. [0003] In addition, LiCoO is known as a positive electrode active material material for lithium secondary batteries. 2 and solid solutions of other compounds. In 2001 published "with α-NaFeO 2 type crystal structure and as LiCoO 2 , LiNiO 2 and LiMnO 2 The Li[Co ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/36H01M4/525
CPCH01M4/505H01M4/525C01G53/50H01M4/131H01M10/052C01P2002/30C01P2002/74C01P2002/76C01P2004/61C01P2006/11C01P2006/12C01P2006/14C01P2006/16H01M4/364Y02E60/10Y02T10/70H01M2004/028H01M2220/20
Inventor 远藤大辅
Owner GS YUASA INT LTD