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Metal electrode and battery

A metal electrode and metal technology, applied in the field of electrochemical cells, can solve the problems of uneven metal dendrites on the surface, and achieve the effects of inhibiting the formation of metal dendrites, increasing the uniformity and stability of the interface, and reducing the increase in impedance.

Pending Publication Date: 2021-11-09
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problem of metal dendrites caused by uneven deposition on the surface of existing metal electrodes, the invention provides a metal electrode and battery

Method used

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Examples

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Embodiment 1

[0062] This embodiment is used to illustrate the battery disclosed in the present invention and its preparation method, including the following steps:

[0063] (1) Preparation of metal electrodes

[0064] Take 2g block copolymer of polyethylene oxide and polystyrene (PEO-PS) (the weight average molecular weight is 30W, the mass ratio of PEO and PS is 50 / 50), 0.6g LiN(SO 2 CF 3 ) 2 , dissolved in 4g tetrahydrofuran to form a solution, apply the solution on the surface of the lithium metal pole piece, dry it in vacuum at room temperature for 2 hours, and then dry it in vacuum at 60°C for 12 hours to obtain a coated lithium metal electrode, as the negative electrode, the thickness of the coating is 5 μm.

[0065] (2) Preparation of battery

[0066] Electrolyte preparation: Using polyethylene oxide (PEO) based solid electrolyte, 2.0g PEO (weight average molecular weight 100W), 0.9g LiN(SO 2 CF 3 ) 2 Dissolve in 5 g of acetonitrile to obtain a solution. The obtained solutio...

Embodiment 2

[0070] This example is used to illustrate the battery disclosed in the present invention and its preparation method, including most of the operating steps in Example 1, the difference being:

[0071] The PEO-based electrolyte of Example 1 was replaced by a Li-based 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) solid electrolyte, Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 The preparation method of the (LATP) solid electrolyte is as described in the literature (Funct. Mater. Lett., 2016, 09, 1650066.), and other operations are the same as in Example 1.

Embodiment 3

[0073] This example is used to illustrate the battery disclosed in the present invention and its preparation method, including most of the operating steps in Example 1, the difference being:

[0074] The PEO-PS of embodiment 1 is replaced by the block copolymer (PCL-PMMA) of polycaprolactone and polymethacrylate (weight-average molecular weight is 50W, and PCL and PMMA mass ratio are 60 / 40), other operation Same as Example 1.

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Abstract

In order to overcome the problem of metal dendrites caused by non-uniform deposition on the surface of an existing metal electrode, the invention provides a metal electrode which comprises a metal layer and a coating, wherein the coating comprises at least one block copolymer; the block copolymer comprises a first polymer block for independently conducting metal ions and a second polymer block for providing mechanical strength; and the shear modulus of the coating is greater than or equal to 107 Pa, and the thickness of the coating ranges from 500 nm to 50 microns. Meanwhile, the invention also discloses a battery comprising the metal electrode. The metal electrode provided by the invention has good ionic conductivity and metal dendritic crystal inhibition capability.

Description

technical field [0001] The invention belongs to the technical field of electrochemical batteries, and in particular relates to a metal electrode and a battery. Background technique [0002] The idea of ​​metal as the negative electrode of batteries has experienced a long period of development since it was proposed. As the negative electrode, metal has advantages in energy density. Taking lithium metal as an example, the potential of lithium (-3.04V vs standard hydrogen electrode) is low, and the theoretical specific capacity (3860mAh / g) is high, which can give the battery a high energy density. Therefore, lithium metal was used as the negative electrode in the research of early lithium secondary batteries. However, due to the consideration of the safety performance of this type of battery, intercalated anode materials such as graphite have gradually emerged, and the research on lithium metal anodes has stagnated for a long period of time. With the increasing demand for en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/134H01M10/052
CPCH01M4/628H01M4/624H01M4/134H01M10/052H01M4/62Y02E60/10H01M4/1395H01M4/38H01M4/622H01M10/0565H01M4/386H01M4/36H01M4/13H01M4/381H01M4/405H01M4/382H01M4/366H01M2004/021H01M2004/027H01M4/387
Inventor 刘中波敖小虎邓永红康媛媛钱韫娴
Owner SHENZHEN CAPCHEM TECH CO LTD
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