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Positive electrode active material, method for producing same, and nonaqueous electrolyte rechargeable battery containing same

A positive electrode active material and non-aqueous electrolyte technology, applied in the field of non-aqueous electrolyte rechargeable batteries, can solve the problems of rising manufacturing costs

Active Publication Date: 2016-03-09
DENSO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the step of loading Fe or Ni must be taken separately, resulting in an increase in manufacturing cost

Method used

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  • Positive electrode active material, method for producing same, and nonaqueous electrolyte rechargeable battery containing same
  • Positive electrode active material, method for producing same, and nonaqueous electrolyte rechargeable battery containing same
  • Positive electrode active material, method for producing same, and nonaqueous electrolyte rechargeable battery containing same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] In the preparation method, a mixed solution preparation step (for example, image 3 in S1). In the mixed solution preparation step, a mixed solution is prepared by adding an inorganic raw material for producing an inorganic oxide having a polyanionic structure to an aqueous solution. Hereinafter, the mixed solution preparation step will also be referred to as a raw material mixed solution preparation step. The raw material mixed solution of the inorganic oxide is prepared in the raw material mixed solution preparation step. When the raw material mixed solution is processed through a subsequent process, an inorganic oxide having a polyanion structure is generated.

[0048] After the raw material mixed solution preparation step, carry out the mixed solution pH value adjustment step (for example, image 3 in S2). Due to the adjustment of the pH value of the mixed solution, inorganic oxides are generated in the subsequent process. Meanwhile, since the pH value of the m...

Embodiment 1

[0091] A stock solution was prepared in the following manner.

[0092] Weigh 1.35molLi 2 SO 4 and 0.09mol(NH 4 ) 2 HPO 4 . Simultaneously weigh MnSO 4 ?5H 2 O and FeSO 4 ?7H 2 O, so that the total of Mn and Fe is 0.09 mol. The various raw materials weighed were mixed with ultrapure water. In this way, a raw material solution was prepared.

[0093] Next, select the figure 2 The raw material solution of the composition shown in the chart and put it in a heat-resistant container (capacity: 100cm 3 )middle. The raw material solutions were added in the following order: Li solution, P solution, Mn solution and Fe solution. After these raw material solutions were added, an aqueous CMC solution was added to the mixed solution so that the solid content became 0.86%.

[0094] In addition, sodium alkylnaphthalenesulfonate as an anionic aromatic compound was added so that the content of sodium alkylnaphthalenesulfonate was 2% by mass based on the mass of the inorganic oxid...

Embodiment 2

[0103] As Example 2, a positive electrode active material (LiMnPO 4 ), except that sodium alkylnaphthalene sulfonate as an anionic aromatic compound is added after the formation of the inorganic oxide by hydrothermal synthesis.

[0104] In Example 2, the pH of the mixed solution was adjusted to 4.8.

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Abstract

A positive electrode active material for a nonaqueous electrolyte rechargeable battery, which includes a core portion and a case portion. The core portion contains an inorganic oxide having a polyanionic structure. The shell portion surrounds the core portion. The shell portion contains carbon and an inorganic accelerator that promotes the formation of the shell portion from the carbon. When the mass of the inorganic oxide is defined as 100%, the content of the inorganic accelerator is 0.2 mass% or more of the inorganic oxide.

Description

technical field [0001] The present invention relates to a positive electrode active material for a nonaqueous electrolyte rechargeable (secondary) battery, a method for preparing the positive electrode active material, and a nonaqueous electrolyte rechargeable battery containing the positive electrode active material. Background technique [0002] In general, lithium-ion rechargeable batteries are characterized by high energy density, which have been used for commercial small-sized devices such as mobile phones and notebook-type personal computers. In recent years, lithium-ion rechargeable batteries have been considered for use in large-scale equipment such as stationary electric storage systems, hybrid vehicles, and electric vehicles. In order to apply the lithium ion rechargeable battery to such a large-scale device, it is necessary to increase the capacity of the lithium ion rechargeable battery. [0003] The capacity of lithium-ion rechargeable batteries is very depende...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/05
CPCH01M4/502H01M4/523H01M10/05H01M4/366H01M4/5825H01M4/587H01M4/62H01M10/052H01M10/4235H01M2220/30H01M50/109Y02E60/10H01M4/505H01M4/58H01M4/583H01M4/22
Inventor 吉田周平柴田大辅金村圣志
Owner DENSO CORP