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Anode sheet, secondary battery and method for manufacturing anode sheet

An anode sheet and anode technology, which is applied in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of reducing the lithium utilization rate of LPD silicon anodes, uneven lithium intercalation amount of silicon anode, and uneven lithium intercalation amount, etc., to achieve intercalation Uniform lithium content, reduced contact area, and high lithium utilization

Active Publication Date: 2020-12-01
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the process and process conditions and other reasons, if the surface of the silicon anode is directly treated with LPD, there will be a problem of uneven lithium intercalation in each part of the silicon anode.
[0004] In addition, due to the uneven amount of lithium intercalation in each part of the anode, there is more lithium intercalation in some areas of the silicon anode. During the operation of the battery, the temperature rises faster in the part of the silicon anode with more lithium intercalation, which in turn causes the silicon anode to intercalate lithium. More parts intercalate lithium faster and further cause the problem of uneven lithium intercalation
[0005] In addition, the lithiated silicon anode has high activity, so the part with more lithium intercalation in the silicon anode is easy to react with oxygen, nitrogen, carbon dioxide, etc. in the air to form lithium salt, thereby reducing the lithium utilization rate of the LPD silicon anode

Method used

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  • Anode sheet, secondary battery and method for manufacturing anode sheet
  • Anode sheet, secondary battery and method for manufacturing anode sheet
  • Anode sheet, secondary battery and method for manufacturing anode sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Anode Sheet Manufacturing:

[0063] Mix the mixture of anode active material Si, anode binder styrene-butadiene rubber, anode conductive agent conductive carbon black SuperP, and deionized water in a mass ratio of 90:5:5 to make an anode slurry;

[0064] According to 102mg / 1540mm 2 The coating weight of the anode slurry is evenly coated on the front and back surfaces of the anode current collector copper foil, and the initial anode sheet is manufactured after drying in a 100°C oven;

[0065] Mix PANI, Pyy and PEDOT / PSS according to the mass ratio a:b:c=1:0:0, and then stir it with deionized water according to the mass ratio of 1:9 to form a conductive polymer slurry, and use dimple coating The conductive polymer slurry is coated on the two opposite surfaces of the initial anode sheet by means of cloth, and a porous conductive polymer layer is formed after drying, wherein the thickness of the conductive polymer layer is 0.5um, and the porosity is 60%;

[0066] The meta...

Embodiment 2

[0068] Anode Sheet Manufacturing:

[0069] The manufacturing method of the anode sheet in this example is the same as that in Example 1, the difference is that the anode active material is SiOx, where x<2, the mass ratio of PANI, Pyy and PEDOT / PSS is a:b:c=0:1:0, conductive polymerization The thickness of the material layer is 2um, and the porosity is 47%.

Embodiment 3

[0071] Anode Sheet Manufacturing:

[0072] The manufacturing method of the anode sheet in this example is the same as in Example 1, the difference is that the anode active material is a mixture of Si-C, the mass ratio of PANI, Pyy and PEDOT / PSS is a:b:c=0.5:0.25:0.25, and the conductive polymer The layer thickness is 5um and the porosity is 30%.

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Abstract

The invention relates to an anode sheet, a secondary battery and a manufacturing method of the anode sheet. The anode sheet comprises an anode current collector; a silicon anode active material layerlaminated on the anode current collector; a conductive polymer layer laminated on the silicon anode active material layer, the conductive polymer layer having a porous structure and a porosity of 20%to 80%. The anode sheet provided by the invention has uniform lithium insertion amount and high lithium utilization rate.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to an anode sheet, a secondary battery and a method for manufacturing the anode sheet. Background technique [0002] In recent years, pure electric vehicles (Electron-Volt, EV) have developed rapidly, but the energy density of lithium-ion batteries, which are the core components of EVs, has not increased significantly, and still cannot meet the actual needs of EVs. Therefore, it is necessary to develop EVs with high energy density. use battery. [0003] The theoretical energy density of silicon materials is 10 times that of traditional graphite, so silicon anodes are very promising anodes for next-generation lithium-ion batteries. However, the silicon anode has a low first effect, and lithium pre-doping (LPD) treatment is required to improve the first effect. After silicon anode LPD, elemental lithium is quickly embedded in the silicon anode and releases heat. However...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/131H01M4/134H01M4/136H01M4/1391H01M4/1395H01M4/1397H01M10/0525
CPCH01M4/0404H01M4/131H01M4/134H01M4/136H01M4/1391H01M4/1395H01M4/1397H01M10/0525H01M2004/021H01M2004/027H01M2220/20Y02E60/10
Inventor 龚志杰潘建伟胡招谢斌
Owner CONTEMPORARY AMPEREX TECH CO
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