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Negative pole piece, electrochemical device comprising negative pole piece and electronic device

A technology of negative electrode sheet and negative electrode, which is applied in the field of electrochemistry and can solve problems such as short circuit, volume expansion, and safety issues

Pending Publication Date: 2022-03-11
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charge and discharge process of lithium metal batteries, lithium deposition causes volume expansion, and due to the current density and the inhomogeneity of lithium ion concentration in the electrolyte, the deposition rate of lithium ions at some sites is too fast, forming lithium dendrites. structure, which seriously affects the efficiency, cycle life and energy density of lithium metal batteries
Moreover, the sharp lithium dendrites are likely to pierce the separator and directly contact the positive electrode to form a short circuit, causing serious safety problems.

Method used

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  • Negative pole piece, electrochemical device comprising negative pole piece and electronic device
  • Negative pole piece, electrochemical device comprising negative pole piece and electronic device
  • Negative pole piece, electrochemical device comprising negative pole piece and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053]

[0054] In a dry argon atmosphere, mix dioxolane (DOL) and dimethyl ether (DME) at a volume ratio of DOL:DME=1:1 to obtain a mixed solvent, and then add lithium salt bistrifluoro Lithium methanesulfonimide (LiTFSI) was dissolved and mixed uniformly to obtain an electrolyte solution with a lithium salt concentration of 1 mol / L.

[0055]

[0056](a)

[0057] Using electrospinning technology, a PVDF fiber membrane with a thickness of 10 μm was prepared using PVDF as a precursor, and the PVDF fiber membrane was placed in a vacuum drying oven at 80°C for 12 hours to obtain a negative electrode skeleton with a thickness of 10 μm. Among them, the porosity of the negative electrode skeleton is 85%.

[0058] (b)

[0059] Electrochemical lithium supplementation is used for pre-supplementation of lithium, and the lithium source is a lithium sheet with a thickness of 0.05mm. Choose a 15μm PE separator, place the negative electrode skeleton and lithium metal on both sides ...

Embodiment 2

[0070] In Example 2, Example 3, Example 4, Example 5, Example 6, Example 7, Example 8 and Example 9, , , , and are the same as in Example 1, and the changes of relevant preparation parameters are shown in Table 1:

[0071] Table 1

[0072]

Embodiment 10

[0074] (a)

[0075] Disperse the PVDF powder in NMP, disperse the PVDF evenly by stirring to obtain a slurry with a solid content of 12%, and use a scraper to coat the slurry on one surface (first surface) of a lithium metal negative electrode with a thickness of 30 μm to form The coating layer with a thickness of 100 μm was dried in a vacuum oven at 80° C. for 12 hours to obtain a negative electrode skeleton with a thickness of 100 μm. Among them, the average particle diameter of the PVDF powder is 10 μm, and the porosity of the negative electrode skeleton is 70%.

[0076] (b)

[0077] The negative electrode skeleton prepared above is placed in a parallel electric field for air polarization. The polarization electric field is 50kV / mm, and the polarization time is 30min. (The second surface) faces the negative pressure side. Among them, the room temperature coercive field strength Ec of PVDF is 50kV / mm.

[0078] (c)

[0079] In a dry argon atmosphere, the second surfac...

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Abstract

The invention provides a negative pole piece, an electrochemical device comprising the negative pole piece and an electronic device, the negative pole piece comprises a negative pole current collector, a lithium metal negative pole and a negative pole framework, a polarization electric field exists in the negative pole framework, the direction of the polarization electric field is from the surface of the negative pole to the negative pole current collector, and the material of the negative electrode framework comprises at least one of piezoelectric polymer, piezoelectric ceramic or piezoelectric single crystal. The negative pole piece can control lithium deposition sites and effectively inhibit growth of lithium dendrites, so that the volume expansion performance of the electrochemical device is effectively improved, and the cycle performance of the electrochemical device is further improved.

Description

technical field [0001] The present application relates to the field of electrochemistry, and specifically relates to a negative electrode sheet, an electrochemical device and an electronic device including the negative electrode sheet. Background technique [0002] Lithium-ion batteries have the advantages of high energy storage density, high open circuit voltage, low self-discharge rate, long cycle life, and good safety. They are widely used in various fields such as electric energy storage, mobile electronic equipment, electric vehicles, and aerospace equipment. With the rapid development of mobile electronic devices and electric vehicles, the market has put forward higher and higher requirements for the energy density, cycle performance and dynamic performance of lithium-ion batteries. Among them, volumetric energy density and mass energy density are an important parameter to measure battery performance. [0003] Lithium metal is the metal with the smallest relative atom...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/66H01M10/0525
CPCH01M4/13H01M4/139H01M4/667H01M10/0525H01M2004/027Y02E60/10H01M10/052H01M10/4235H01M4/628H01M4/382H01M4/134H01M4/62H01M2004/021
Inventor 关文浩陈茂华谢远森
Owner NINGDE AMPEREX TECH
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