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Lithium secondary battery

A lithium secondary battery and lithium ion technology, which is applied in secondary batteries, lithium batteries, secondary battery repair/maintenance, etc., can solve the problems of discharge capacity and cycle characteristics reduction

Pending Publication Date: 2022-04-01
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, discharge capacity and cycle characteristics tend to degrade

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0113] (1) Production of positive electrode

[0114] The lithium-nickel composite oxide (LiNi 0.8 co 0.18 al 0.02 o 2 ), acetylene black, and PVdF were mixed, NMP was added, and stirred using a mixer (manufactured by Primix, T.K.HIVIS MIX) to prepare a positive electrode slurry. Next, the positive electrode slurry was coated on the surface of the Al foil, and the coated film was dried and then rolled to produce a film with a density of 3.6 g / cm on both sides of the Al foil. 3 The positive electrode of the positive electrode mixture layer.

[0115] (2) Production of negative electrode

[0116] (i) Negative electrode collector

[0117] Electrolytic copper foil (thickness: 10 μm) was cut into predetermined electrode sizes to obtain negative electrode current collectors.

[0118] (ii) Tier 1

[0119] Artificial graphite (average particle size: 3 μm) as an active material, acetylene black, and PVdF were mixed at a mass ratio of 90:3:7, NMP was added, and stirred using a mix...

Embodiment 2

[0128] In the forming step of the third layer, a raw material solution containing PVdF (concentration: 8% by mass), LiFSI (represented as LFSI in Table 1) (concentration: 1% by mass) and NMP is used to form a layer on both main surfaces of the first layer. A lithium secondary battery A2 was produced in the same manner as in Example 1 except that a porous membrane with a thickness of 3 μm was used as the third layer.

Embodiment 3

[0130] In the formation process of the first layer, the aluminum film with a thickness of 0.1 μm was formed on both sides of the negative electrode current collector by the sputtering method without using the slurry containing artificial graphite, and a lithium bicarbonate was produced in the same manner as in Example 2 Secondary battery A3.

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Abstract

A lithium secondary battery provided with a positive electrode, a negative electrode in which lithium metal is precipitated during charging and the lithium metal is dissolved during discharging, a lithium ion conductive nonaqueous electrolyte, and a separator disposed between the positive electrode and the negative electrode, the negative electrode including a negative electrode current collector and a plurality of layers laminated on the negative electrode current collector, the plurality of layers including a first layer, a second layer, and a third layer, among the first through third layers, the first layer is closest to the negative electrode current collector, the third layer is farthest from the negative electrode current collector, the first layer contains a material capable of absorbing lithium ions, the second layer contains lithium metal, and the third layer has insulating properties and lithium ion permeability.

Description

technical field [0001] The present invention relates to the improvement of lithium secondary battery. Background technique [0002] Non-aqueous electrolyte secondary batteries are used in ICT such as computers and smartphones, in-vehicle, and power storage applications, and require high capacity. Lithium-ion batteries are known as high-capacity non-aqueous electrolyte secondary batteries. Higher capacity of lithium-ion batteries can be achieved, for example, by using graphite and an alloy active material in combination as a negative electrode active material. As the alloy active material, silicon, silicon compounds, and the like have been proposed. However, the increase in capacity of lithium-ion batteries has gradually reached its limit. [0003] A lithium secondary battery (lithium metal secondary battery) is promising as a nonaqueous electrolyte secondary battery with a higher capacity than a lithium ion battery. In a lithium secondary battery, lithium metal is deposi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M10/052H01M10/0587H01M10/42
CPCH01M10/0568H01M10/0569H01M4/587H01M4/134Y02E60/10Y02P70/50H01M4/382H01M4/366H01M2004/021H01M2004/027H01M4/133H01M4/62H01M4/525H01M2010/4292H01M4/0445H01M4/623H01M10/0525H01M2300/0034
Inventor 蚊野聪宫前亮平
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD