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Positive plate and application thereof

A technology of positive electrode sheet and active layer, which is applied to the positive electrode sheet and its application fields, can solve the problems of deterioration of cycle performance and safety performance of lithium ion batteries, etc.

Inactive Publication Date: 2020-11-06
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a positive electrode sheet, which is used to solve the problem that the cycle performance and safety performance of lithium-ion batteries are deteriorated due to acidic substances in the electrolyte solution of lithium-ion batteries

Method used

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  • Positive plate and application thereof
  • Positive plate and application thereof
  • Positive plate and application thereof

Examples

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Embodiment 1

[0062] The positive electrode sheet provided by the present invention includes a current collector and an active layer arranged on the upper surface and the lower surface of the current collector, and the active layer includes functional particles, and the functional particles are PEI-SiO 2 , the particle size is 20nm, and the mass of functional particles is 0.1% of the total mass of the active layer, and the compacted density of the positive electrode sheet is 4.1g / cm 3 , the porosity of the active layer is 18%.

[0063] The preparation method of functional particles in this embodiment includes:

[0064] 1. Weigh 15g nano-silica and add 200mL HNO 3 solution, HNO 3 The concentration of the solution is 1mol / L, stirred at 80°C for 6h, filtered under reduced pressure, washed with deionized water until neutral, and dried naturally at room temperature to obtain activated silica;

[0065] 2. Weigh 3g activated silica and add 120mL toluene, 2 Add 100 mL of toluene and 10 mL of 3-...

Embodiment 2

[0072] The positive electrode sheet provided by the present invention includes a current collector and an active layer arranged on the upper surface and the lower surface of the current collector, and the active layer includes functional particles, and the functional particles are PEI-SiO 2 , the particle size is 20nm, and the mass of functional particles is 0.2% of the total mass of the active layer, and the compacted density of the positive electrode sheet is 4.1g / cm 3 , the porosity of the active layer is 18%.

[0073] The preparation method of the functional particles in this example is the same as that in Example 1.

[0074] The preparation method of the positive electrode sheet provided in this example is similar to that of Example 1, except that the solid content in the functional particle dispersion system is 0.2%.

Embodiment 3

[0076] The positive electrode sheet provided by the present invention includes a current collector and an active layer arranged on the upper surface and the lower surface of the current collector, and the active layer includes functional particles, and the functional particles are PEI-SiO 2 , the particle size is 20nm, and the mass of functional particles is 0.4% of the total mass of the active layer, and the compacted density of the positive electrode sheet is 4.1g / cm 3 , the porosity of the active layer is 18%.

[0077] The preparation method of the functional particles in this example is the same as that in Example 1.

[0078] The preparation method of the positive electrode sheet provided in this example is similar to that of Example 1, except that the solid content in the functional particle dispersion system is 0.5%.

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Abstract

The invention provides a positive plate and application thereof. A first aspect of the invention provides a positive plate. The positive plate comprises a current collector and an active layer, and the active layer is arranged on the upper surface and / or the lower surface of the current collector. At least one active layer comprises functional particles, and the functional particles are oxides ofwhich the outer layers comprise -NH- or -NH2 groups. According to the positive plate provided by the invention, the active layer comprises the functional particles, and-NH-or-NH2 groups on the outer layers of the functional particles can adsorb acidic substances in the lithium ion battery and reduce the acid content in the lithium ion battery, so that consumption of lithium ions and corrosion of the acidic substances to a positive electrode material are avoided. Besides,-NH- or -NH2 groups on the outer layers of the functional particles have certain hydrophilicity, so that the wettability of the electrolyte can be effectively improved, lithium ion channels are increased, the liquid retention rate of the positive plate is increased, and the ionic conductivity between the positive plate andthe electrolyte is ensured, and therefore, the cycle performance and the safety performance of the lithium ion battery are improved.

Description

technical field [0001] The invention relates to a positive electrode sheet and its application, and relates to the technical field of lithium ion batteries. Background technique [0002] With the continuous development of lithium-ion battery-related technologies, lithium-ion batteries have become a secondary battery with a wide range of uses. Since the electrolyte of lithium-ion batteries needs to use lithium hexafluorophosphate as the electrolyte, it is inevitable that hydrofluoric acid will be entrained into the lithium-ion battery during the preparation of the electrolyte; in addition to lithium hexafluorophosphate, other lithium salts cannot be used in the electrolyte. Avoid the production of acidic substances, such as lithium difluorooxalate borate and lithium bisoxalate borate may produce boric acid. [0003] When the acid content in the lithium-ion battery exceeds a certain concentration, it will not only consume lithium ions, but also corrode the positive electrode ...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/131H01M4/1391H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 潘跃德李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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