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Preparation method of nano-diamond electrolyte and nano-diamond solid electrolyte interface

A nano-diamond and solid electrolyte technology, which is applied in the manufacture of electrolyte batteries, electrode carriers/collectors, non-aqueous electrolyte batteries, etc., can solve problems such as unsuitable for large-scale industrial mass production, harsh conditions in the preparation process, and complex additive structures. To achieve the effect of inhibiting volume expansion, easy to implement, and easy to scale up

Pending Publication Date: 2022-03-08
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium battery electrolyte additive has a maximum cycle capacity retention rate of 98.2% at room temperature, but the preparation process is complicated, the cost is high, and it produces large pollution
[0004] The application number is 202011503470.1 patent application titled "An electrolyte additive, an electrolyte containing the additive, and a lithium-ion battery". The bis(trialkylsilyl)fluorophosphate structure synthesized by this invention contains two trialkyl groups Silicon base, phosphate ester group and fluorine element effectively improve the cycle stability of lithium-ion batteries under high voltage, but the structure of the additive is very complex, and the preparation process is harsh, so it is not suitable for large-scale industrial mass production

Method used

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  • Preparation method of nano-diamond electrolyte and nano-diamond solid electrolyte interface
  • Preparation method of nano-diamond electrolyte and nano-diamond solid electrolyte interface
  • Preparation method of nano-diamond electrolyte and nano-diamond solid electrolyte interface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: the preparation of nano-diamond electrolyte

[0037] Take the concentrated hydrochloric acid and the concentrated sulfuric acid solution of 5ml respectively, configure the mixed acid solution that the volume ratio is 1:1; The concentrated hydrochloric acid is the hydrochloric acid solution that commercially available concentration is 36wt%~38wt%; The concentrated sulfuric acid is the concentration 98wt% sulfuric acid solution;

[0038] Add 0.2g (particle size: 5-10nm) of nano-diamond particles into the above mixed acid solution, and heat at 200°C for 30-40min to remove metal impurities on the surface of the diamond particles;

[0039] Take 0.1 g of acid-treated nano-diamond particles, and treat them under ultraviolet (BZS250GF-TC) irradiation for 15 s (15-20 s are acceptable) to obtain oxygen-terminated nano-diamond particles;

[0040] Commercial 1mol / L LiPF 6 (EC:DMC=1:1) The electrolyte is recorded as sample 1, take 0.024g of oxygen-terminated nano-dia...

Embodiment 2

[0042] Embodiment 2: the making of lithium ion battery

[0043] The lithium-ion battery negative electrode is composed of 80wt% commercial graphite (active material), 10wt% binder (polyvinylidene fluoride, PVDF) and 10wt% conductive aid carbon black.

[0044] The three were mixed and ground for 0.5 h, then put into a container, and a certain amount of 1-methyl-2-pyrrolidone (NMP, solvent) was added into the container, and then placed on a magnetic stirrer and stirred at a constant speed for 6 h, until the mixture became a viscous fluid.

[0045] Copper foil is used as a current collector, and the above-mentioned mixed viscous material is coated on the copper foil, and the coating density must be uniform.

[0046] The temperature of the vacuum drying oven was set at 120° C., and the above-mentioned copper foil smear was taken and placed in the drying oven. After timing for 12 hours, it was taken out for use.

[0047] The prepared copper foil smear is cut into several electrode...

Embodiment 3

[0051] Embodiment 3: the test of lithium-ion battery and the formation of nano-diamond solid electrolyte interface

[0052] The electrochemical performance of batteries S1 and S2 was tested in the blue electric test system. At 25°C, discharge to 0.01V at a certain rate; after discharge, let the battery stand for 3 minutes; then charge to 3V at a certain rate, after charging, discharge the battery at the same constant rate for 3 minutes to 0.01V; after discharging the battery, let it stand for 3 minutes, and then charge it under the same conditions. After the test was completed, the active substances in S1 and S2 were taken out and recorded as sample 3 and sample 4, and were characterized by a transmission electron microscope (JEM-2100F, JEOL).

[0053] Testing and Characterization

[0054] 1) Charge and discharge performance test

[0055] The electrochemical performance test results at 5C rate are as follows: figure 2 It can be seen from the figure that the initial discha...

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Abstract

The invention discloses a preparation method of a nano-diamond electrolyte and a nano-diamond solid electrolyte interface. The method specifically comprises the following steps: treating nano-diamond through ultraviolet (UV) to obtain oxygen-terminated nano-diamond particles, and uniformly dispersing the oxygen-terminated nano-diamond particles into a commercial LiPF6 electrolyte to prepare the nano-diamond electrolyte. Graphite is used as a negative electrode, a lithium sheet is used as a positive electrode, the nano-diamond electrolyte is used for preparing the lithium ion battery in a water-free and oxygen-free environment, and charging and discharging circulation is carried out on a blue electricity testing system. And in the charge-discharge cycle process, nano-diamond particles in the nano-diamond electrolyte move to the graphite anode together with lithium ions under the action of electric field force, and finally, a nano-diamond interface is constructed on the surface of the graphite anode. The volume expansion of the lithium dendrites and the negative electrode material can be inhibited, the interface resistance is relatively low, the solid-phase diffusion of lithium ions is facilitated, and the excellent performances of high specific capacity, good cycle performance, high charge-discharge coulombic efficiency and the like are shown.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolyte, and relates to a method for preparing a nano-diamond electrolyte and a nano-diamond solid electrolyte interface. Background technique [0002] The rapid development of portable electronic devices and vehicles such as mobile phones, notebook computers, digital cameras, and electric vehicles has made lithium-ion batteries increasingly important. Improving energy density, stability and safety is the development trend of next-generation lithium-ion batteries. The electrolyte system is one of the key factors that determine the electrochemical performance of graphite as the negative electrode material in the rechargeable lithium battery system. At present, most lithium-ion batteries use commercial lithium hexafluorophosphate (ethylene carbonate as the solvent) electrolyte. During the charging and discharging process, the electrolytic The side reaction between the liquid and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/66H01M10/0562H01M10/058
CPCH01M10/058H01M10/0562H01M4/625H01M4/661Y02E60/10Y02P70/50
Inventor 李红东王琛孙小晨张鑫刘钧松高楠成绍恒王启亮翟晓丽冯晶
Owner JILIN UNIV
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