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Lithium-ion secondary battery

A secondary battery, lithium ion technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as undocumented deterioration, and achieve the effect of improving battery capacity retention rate

Inactive Publication Date: 2017-10-13
EREKUSERU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in Patent Document 1, although the experimental data of "discharge capacity per 1 g of active material" is described in Tables 3 to 4, no experimental data is described about the deterioration after charge-discharge cycles.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0084] Part of an aluminum hard foil (JIS A 3003-H18; composition: 96.90% by mass of aluminum, 0.6% by mass of silicon, 0.7% by mass of iron, 0.2% by mass of copper, 1.5% by mass of manganese, and 0.1% by mass) of a thickness of 20 μm On the surface, an acidic aqueous solution containing 0.3% by mass of hydrogen fluoride and 0.5% by mass of a nonionic surfactant as a pretreatment liquid at a liquid temperature of 25°C was infiltrated into a polyolefin sponge at a coating amount of 10 g / m 2 The coating process was performed, and after 20 seconds, the surface of the aluminum hard foil was washed with water. Then, the aluminum rigid foil was immersed for 60 seconds in a post-treatment liquid having a liquid temperature of 35° C. containing 12% by mass of hydrochloric acid and 15% by mass of aluminum chloride. The surface roughness Ra of the obtained etched aluminum foil was 0.6 μm.

Embodiment 2

[0086] It manufactured similarly to Example 1 except having immersed aluminum hard foil in the post-processing liquid for 40 second. The surface roughness Ra of the obtained etched aluminum foil was 0.4 μm.

Embodiment 3

[0088] It manufactured similarly to Example 1 except having immersed aluminum hard foil in the post-processing liquid for 30 second. The surface roughness Ra of the obtained etched aluminum foil was 0.3 μm.

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Abstract

Provided is a lithium-ion secondary battery with which it is possible to improve the battery capacity retention rate after repeated high-rate charging and discharging. This lithium-ion secondary battery comprises: a positive electrode in which a layer containing a positive-electrode active material is formed upon a positive-electrode collector, said positive-electrode active material being represented by formula (I); a negative electrode; and a non-aqueous electrolyte. The average primary particle size of the positive-electrode active material is 0.50 mu m to 2 mu m inclusive, and the average surface roughness Ra of a surface of the positive-electrode collector in contact with the layer containing the positive-electrode active material is 0.2 mu m to 0.6 mu m inclusive. In formula (I), M is at least one metal element selected from the group consisting of Co, Ni, Fe, Mn, Cu, Mg, Zn, Ti, Al, Si, B and Mo, and 0<X<2, wherein the formula (I) is LixMPO4.

Description

technical field [0001] The invention relates to an application of a lithium ion secondary battery, in particular to the use of olivine lithium oxide such as lithium iron phosphate as a positive electrode active material. Background technique [0002] Lithium-ion secondary batteries are excellent in energy density and output density, and are conducive to small size and light weight. Therefore, they are widely used in mobile phones, note personal computers, portable information terminals (Personal Digital Assistant, PDA)), camcorders, digital cameras and other portable devices with large power consumption. Based on these characteristics, lithium-ion secondary batteries have become a key technology in energy-saving or energy storage battery technology. Regarding energy saving, it can be listed in the application of electric vehicle (Electric Vehicle, EV) or hybrid electric vehicle (Hybrid Electric Vehicle, HEV) with the goal of reducing carbon dioxide emissions; as for energy ...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/58H01M4/66H01M10/052
CPCH01M4/136H01M4/58H01M4/66H01M4/5825H01M4/661H01M4/667H01M10/0525H01M2004/021Y02E60/10
Inventor 星原悠司东崎哲也高本壮祐
Owner EREKUSERU
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