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Positive electrode active material, non-aqueous electrolyte secondary battery, and process for producing positive electrode active material

A technology of positive active material and manufacturing method, applied in non-aqueous electrolyte storage battery, secondary battery, electrode manufacturing, etc., can solve problems such as low specific capacity, and achieve the effect of less reduction in discharge capacity and excellent cycle characteristics

Inactive Publication Date: 2014-01-01
FURUKAWA ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, since the specific capacity of the other positive electrode active material side combined is low, the reality is that the large theoretical specific capacity of Si cannot be truly realized in a practical battery.

Method used

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  • Positive electrode active material, non-aqueous electrolyte secondary battery, and process for producing positive electrode active material
  • Positive electrode active material, non-aqueous electrolyte secondary battery, and process for producing positive electrode active material
  • Positive electrode active material, non-aqueous electrolyte secondary battery, and process for producing positive electrode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0105] Hereinafter, although an Example demonstrates this invention, this invention is not limited at all by this Example.

[0106] It should be noted that, although in the following examples, the synthesis of lithium iron silicate compound is carried out, in the case of using other transition metals, or in the case of adding other anions to the constituent materials, it can also be similarly Synthesize, provide.

[0107] (1-1) Example 1

[0108] (production of particulate mixture)

[0109] The production apparatus for producing the particulate mixture by the spray combustion method is shown in figure 1 middle. figure 1 The reaction vessel of the device shown in the vessel is equipped with a particle synthesis nozzle 3, propane gas (C 3 h 8 ), air (Air), and raw material solution 2 are supplied from the nozzle 3 to the generated flame. On the other hand, there is an exhaust pipe 9 for discharging generated particles or reaction products, and the particle mixture 7 in the...

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Abstract

The purpose of the present invention is to provide a lithium transition metal silicate type positive electrode active material which has excellent cycle properties and undergoes the decrease in discharge capacity to a reduced extent even when charge and discharge are performed repeatedly. The present invention provides a positive electrode active material characterized by comprising a lithium transition metal silicate which is represented by the general formula Li2-yFe1-xMxSi1-yXyO4 (wherein M represents at least one transition metal selected from the group consisting of Mn, Ti, Cr, V, Ni, Co, Cu, Zn, Al, Ge, Zr, Mo and W; X represents at least one element selected from the group consisting of Ti, Cr, V, Zr, Mo, W, P and B; 0 <= x <= 1; and 0 <= y<=0.25), and which has a mixed phase composed of an orthorhombic structure having a symmetric Pmn21 space group and a monoclinic structure having a symmetric P21 / n space group.

Description

technical field [0001] The present invention relates to a positive electrode active material containing a lithium transition metal silicate used in a positive electrode of a nonaqueous electrolyte secondary battery, and the like. Background technique [0002] In recent years, as electronic devices have become more mobile and more functional, secondary batteries as drive power sources have become one of the most important components. In particular, Li-ion secondary batteries have replaced conventional NiCd batteries or Ni-hydrogen batteries to occupy the mainstream position of secondary batteries due to their high energy density obtained from the high voltage of the positive electrode active material and negative electrode active material used. However, the commonly used lithium cobalt oxide (LiCoO 2 )-based positive electrode active material and carbon-based negative electrode active material Li-ion secondary batteries cannot sufficiently provide the power consumption of re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/36
CPCH01M4/36Y02E60/12H01M4/525H01M4/58Y02T10/7011H01M4/505H01M10/052C01B33/32Y02E60/122H01M4/131H01M4/0471H01M4/136H01M4/1397H01M4/364H01M4/366H01M4/5825H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 平山阳介大久保典雄风间吉则阿部英俊根本美优
Owner FURUKAWA ELECTRIC CO LTD
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