Pyrophosphate compound and method for producing same

A technology for pyrophosphate compounds and manufacturing methods, which is applied in the fields of phosphorus compounds, chemical instruments and methods, and final product manufacturing. It can solve the problems of mixed-in synthesis, difficulty in removing impurities, etc., and achieve the effect of easy synthesis and inhibition of mixing-in

Inactive Publication Date: 2012-11-28
THE UNIV OF TOKYO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, according to the findings of the present inventors, as Li 2 FeP 2 o 7 When the amount of Fe is increased in this way, a high battery capacity can be obtained, but it is difficult to synthesize it without impurities.

Method used

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  • Pyrophosphate compound and method for producing same
  • Pyrophosphate compound and method for producing same
  • Pyrophosphate compound and method for producing same

Examples

Experimental program
Comparison scheme
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Embodiment 1～4 and comparative example 1～3

[0049] to make Li 2 mn 1-x Fe x P 2 o 7 (0≤x≤1) becomes the mode of the stoichiometric ratio shown in Table 1, weighing lithium carbonate (Li 2 CO 3 ), manganese oxalate hydrate (MnC 2 o 4 0.5H 2 O), iron oxalate hydrate (FeC 2 o 4 2H 2 O), ammonium hydrogen phosphate [(NH 4 ) 2 HPO 4 ], using acetone as a solvent, wet pulverization and mixing with a ball mill at 240 rpm for 30 minutes and at 480 rpm for 2 hours. The mixed slurry was dried under reduced pressure at room temperature to obtain a precursor. It was fired at 600°C for 6 hours in an Ar atmosphere to obtain a high-temperature phase of HT-Li 2 mn 1-x Fe x P 2 o 7 (0≤x≤1), fired at 450°C for 24 hours, thus obtaining the low-temperature phase of LT-Li 2 mn 1-x Fe x P 2 o 7 (0≤x≤1).

[0050] [Table 1]

[0051]

[0052] (structural analysis)

[0053] Powder X-ray diffraction measurements used CuKα as the line source. Structural analysis of the product, identification of impurities, and prese...

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Abstract

Disclosed are: a positive electrode active material containing a pyrophosphate compound, which can be easily synthesized since mixing of impurities can be easily suppressed, and which is capable of providing high battery capacity; and a lithium ion battery which uses the positive electrode active material. Specifically disclosed is a pyrophosphate compound which is represented by general formula: Li2M1-xFexP2O7 (wherein M represents one or more metals selected from among Mn, Zr, Mg, Co, Ni, V and Cu, and x satisfies 0.3 <= x< = 0.9).

Description

technical field [0001] The present invention relates to a pyrophosphate compound, a method for producing the same, and a positive electrode active material using the pyrophosphate compound. Background technique [0002] At present, as batteries that can be used economically for a long time, research on rechargeable secondary batteries continues. In particular, lithium-ion batteries have advantages such as high output power and high energy density. It consists of a positive electrode, a negative electrode, and a non-aqueous electrolyte of an active material that releases and inserts lithium ions. [0003] As the positive electrode active material of the lithium ion battery, metal oxides, metal sulfides, or polymers are used, and known ones include, for example, TiS 2 、MoS 2 , NbSe 2 , V 2 o 5 Lithium-free compounds, LiMO 2 (M=Co, Ni, Mn, Fe, etc.), LiMn 2 o 4 Such lithium composite oxides and the like. Among them, using LiMn 2 o 4 The constituted battery has a high...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/12H01M4/5825Y02E60/122H01M10/0525C01B25/42Y02E60/10Y02P70/50
Inventor 山田淳夫西村真一夏井龙一
Owner THE UNIV OF TOKYO
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