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Electrodes, secondary batteries, battery packs, electric vehicles and power storage systems

A secondary battery and positive electrode technology, applied in secondary batteries, secondary battery repair/maintenance, electric vehicles, etc., to achieve the effect of excellent battery characteristics

Active Publication Date: 2017-08-11
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the case where the lithium composite oxide is heated to a temperature from 200 degrees Celsius to 300 degrees Celsius in a charged state, the lithium composite oxide easily extracts oxygen.

Method used

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  • Electrodes, secondary batteries, battery packs, electric vehicles and power storage systems
  • Electrodes, secondary batteries, battery packs, electric vehicles and power storage systems
  • Electrodes, secondary batteries, battery packs, electric vehicles and power storage systems

Examples

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Embodiment 1 to 46

[0213] Manufactured by the following process figure 1 with figure 2 Cylindrical Li-ion secondary battery shown in .

[0214] After manufacturing the positive electrode 21, firstly, 91 parts by mass of the positive electrode active material (lithium phosphate compound), 5 parts by mass of the positive electrode binder (polyvinylidene fluoride (PVDF)) and 4 parts by mass of the positive electrode conductor (acetylene black) to obtain a positive electrode mixture. The composition of the lithium phosphate compound is shown in Table 1 and Table 2. Subsequently, the cathode mixture was dispersed in an organic solvent (N-methyl-2-pyrrolidone NMP) to obtain a pasty cathode mixture slurry. Subsequently, the cathode mixture slurry was uniformly coated on both surfaces of the belt-shaped (15 μm thick aluminum foil) cathode current collector 21A using a coating device, which was dried to form the cathode active material layer 21B. Finally, the positive electrode active material layer...

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Abstract

The present invention relates to electrodes, secondary batteries, battery packs, electric vehicles and power storage systems. (A) The positive electrode active material of the positive electrode includes a lithium phosphate compound represented by LiaM1bPO4 (M is Fe or the like, 0≤a≤2, b≤1). (B) The pore distribution of the positive electrode measured by mercury intrusion porosimetry indicates peak P1 within a range of pore diameters equal to or greater than about 0.01 micrometers and less than about 0.15 micrometers, and indicates peak P1 within a pore diameter of from about 0.15 micrometers to about 0.9 micrometers. Peak P2. (C) The ratio I2 / I1 between the intensity I1 of peak P1 and the intensity I2 of peak P2 is from about 0.5 to about 20. (D) The porosity of the positive electrode is from about 30% to about 50%.

Description

technical field [0001] The present technology relates to an electrode whose active material includes a lithium phosphate compound, a secondary battery using the electrode, and a battery pack, an electric vehicle, an electric power storage system, an electric tool, and an electronic device using the secondary battery. Background technique [0002] In recent years, various electronic devices such as mobile phones and personal digital assistants (PDAs) have been widely used, and further reduction in size and weight of the electronic devices and their long lifespan have been required. Accordingly, as a power source for electronic devices, batteries, particularly, small and light-weight secondary batteries capable of providing high energy density have been developed. Recently, it has been considered to apply such a secondary battery to other various applications other than the aforementioned electronic devices. Representative examples of such other applications may include batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M4/58H01M4/136
CPCH01M4/131H01M4/366H01M4/485H01M4/505H01M4/525H01M4/621H01M4/625H01M4/136H01M4/5825H01M10/052H01M10/425H01M2004/021H01M2004/028Y02E60/10Y02T10/70
Inventor 松下忠史松井贵昭石井武彦
Owner MURATA MFG CO LTD