A sodium storage hard carbon anode based on an intercalation-electroplating hybrid mechanism and its preparation method

A hard carbon and negative electrode technology, applied in the field of sodium storage hard carbon negative electrode and its preparation, can solve the problems of fast cycle decay of sodium metal negative electrode, uncontrollable growth of dendrites, unstable SEI film and large volume change, etc. Performance, the effect of low experimental temperature

Active Publication Date: 2022-05-27
FUJIAN NORMAL UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similar to lithium metal electrodes, sodium metal anodes also have problems such as uncontrollable dendrite growth, unstable SEI film and large volume change, which lead to rapid cycle decay of sodium metal anodes.
Hard carbon is a typical embedded sodium storage carbon anode, the volume change is small during the sodium storage process, and the cycle performance is stable, but the capacity based on the embedded sodium storage mechanism is not high (reversible capacity is less than 300 mA hg -1 )

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A sodium storage hard carbon anode based on an intercalation-electroplating hybrid mechanism and its preparation method
  • A sodium storage hard carbon anode based on an intercalation-electroplating hybrid mechanism and its preparation method
  • A sodium storage hard carbon anode based on an intercalation-electroplating hybrid mechanism and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A high-capacity sodium storage hard carbon negative electrode based on embedding-plating mixing mechanism, the specific preparation method includes the following steps:

[0023] (1) Weigh the chlorinated choline and urea with a molar ratio of 0.5: 1 and dissolve at 60 ° C to form a colorless transparent ionic liquid, and then add AgNO 3 Stir until completely dissolved to give an ionic liquid containing Ag ions; wherein AgNO 3 The amount added accounts for the concentration of the ionic liquid at 0.05mol / L;

[0024] (2) The hard carbon (purchased from Shenzhen Kejing Co., Ltd.): CMC = 85:15 (mass ratio) is mixed and ground and evenly coated at 1.2 cm 2 The copper foil is used as the substrate, and after drying at 100 °C, it is cut into a square pole piece of 1.2cm*2.5cm;

[0025] (3) The cropped polar piece is placed in an ionic liquid, at a temperature of 25 °C, a constant voltage of 2.5V, and electrodeposition is 3min to obtain HC-Ag material.

[0026] Sodium metal battery ...

Embodiment 2

[0028] A high-capacity sodium storage hard carbon negative electrode based on embedding-plating mixing mechanism, the specific preparation method includes the following steps:

[0029] (1) Weigh the chlorinated choline and urea with a molar ratio of 0.5: 1 and dissolve at 70 ° C to form a colorless transparent ionic liquid, and then add Cu (NO 3 ) 2 Stir until completely dissolved to give an ionic liquid containing Cu metal ions; wherein Cu (NO 3 ) 2 The amount of addition accounts for the concentration of the ionic liquid is 0.075mol / L;

[0030] (2) The hard carbon: CMC = 85: 15 (mass ratio) is mixed and ground and evenly coated at 1.2 cm 2 The copper foil is used as the substrate, and after drying at 100 °C, it is cut into a square pole piece of 1.2cm*2.5cm;

[0031](3) The cropped polar piece is placed in an ionic liquid, at a temperature of 25 °C, a constant voltage of 4V, and an electrodeposition of 5min to obtain HC-Cu material.

[0032] Sodium metal battery assembly: Cut t...

Embodiment 3

[0034] A high-capacity sodium storage hard carbon negative electrode based on embedding-plating mixing mechanism, the specific preparation method includes the following steps:

[0035] (1) Weigh the molar ratio of 0.5: 1 choline chloride and urea at 80 °C heating dissolved stirring to form a colorless transparent ionic liquid, and then add AgNO 3 Stir until completely dissolved to give an ionic liquid containing Ag ions; wherein AgNO 3 The amount added accounts for the concentration of the ionic liquid at 0.1mol / L;

[0036] (2) The hard carbon: CMC = 85: 15 (mass ratio) is mixed and ground and evenly coated at 1.2 cm 2 The copper foil is used as the substrate, and after drying at 100 °C, it is cut into a square pole piece of 1.2cm*2.5cm;

[0037] (3) The cropped polar piece is placed in an ionic liquid, at a temperature of 25 °C, a constant voltage of 5.5V, and electrodeposition for 8min, HC-Ag material is obtained.

[0038] Sodium metal battery assembly: Cut the prepared HC-Ag to...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of sodium ion electrode materials, and in particular relates to a sodium storage hard carbon negative electrode based on an intercalation-electroplating hybrid mechanism and a preparation method thereof. The design of this application adopts ionic liquid (low temperature molten salt) electroplating method to directly plate Ag, Cu and other sodium-friendly metal nanoparticles on the hard carbon film electrode to achieve uniform deposition of sodium metal negative electrode, and finally obtain high-capacity and high-stability intercalation ‑Electroplated hard carbon based sodium storage negative electrode. The biggest feature of the ionic liquid used in this application is the absence of H + , can prevent the electrode template from falling off when it comes into contact with water, and its electrochemical window is as high as 2.23 V. The application temperature is low, energy-saving and non-toxic and green, and more importantly, it can effectively adjust the size of metal particles, and it can be used as a sodium metal negative electrode material. out of excellent performance.

Description

Technical field [0001] The present invention belongs to the technical field of sodium ion electrode materials, specifically relates to a sodium storage hard carbon negative electrode based on embedding - electroplating mixing mechanism and preparation method thereof. Background [0002] In the era of information technology, rechargeable batteries have become an important part of electronic devices. Sodium is highly abundant and theoretically specific to capacity (1166 mA h g -1 ) and other advantages are expected to become a very attractive negative electrode for post-lithium battery design. However, similar to lithium metal electrodes, the sodium metal negative electrode also has problems such as uncontrollable growth of dendrites, unstable SEI membrane and large volume changes, resulting in rapid cyclic attenuation of the sodium metal negative electrode. Hard carbon is a typical embedded sodium storage carbon anode, the volume change during the sodium storage process is small, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1393H01M4/04H01M4/133H01M10/054H01M10/058
CPCH01M4/1393H01M4/0452H01M4/0404H01M4/0471H01M4/133H01M10/058H01M10/054Y02P70/50Y02E60/10
Inventor 洪振生邱若雪于跃跃
Owner FUJIAN NORMAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap