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Polycaprolactone-based hyperbranched polymer all-solid-state electrolyte and lithium ion battery

A technology of hyperbranched polymer and polycaprolactone is applied in the field of lithium-ion batteries, which can solve the problems of instability of electrolyte and lithium metal, potential safety hazards of solvent flammability, and inability to support battery operation, and achieve excellent charge-discharge rate. performance, excellent long-term cycle stability, easy-to-implement effects

Active Publication Date: 2020-06-05
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium metal has attracted widespread attention due to its excellent properties (such as high energy density, light weight, etc.), but it is difficult to actually use lithium metal as an anode material in current commercial lithium-ion battery systems.
One is that the electrolyte selected in the existing lithium-ion battery system is still the electrolyte, and the electrolyte and lithium metal are unstable and prone to chemical reactions, and the electrolyte has a great safety hazard due to the flammability of the solvent. frequent accidents
The second is that although lithium metal can increase the energy density of the battery as the negative electrode, it will also bring about the problem of lithium dendrites, which will cause the battery to be easily short-circuited and the battery life will be shorter
According to literature reports, PCL has a wide electrochemical stability window (about 5V) and a high lithium ion migration number, but its ion conductivity at room temperature is low, which cannot support the normal operation of the battery, and when it dissolves lithium salt, its melting point The melting phenomenon is more likely to occur at high temperature, and the pure polycaprolactone solid electrolyte in the molten state cannot take into account the functions of the electrolyte and the separator at the same time, causing the battery to be easily short-circuited at high temperature, which greatly limits the use of pure PCL solid polymer electrolyte. practical application

Method used

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  • Polycaprolactone-based hyperbranched polymer all-solid-state electrolyte and lithium ion battery
  • Polycaprolactone-based hyperbranched polymer all-solid-state electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] In a three-neck round bottom flask, 20 g of caprolactone monomer with molecular weight of 114, 0.84 g of initiator (2,2-bis((2'-hydroxy-2'-methylpropionyloxy)methyl)propane Propargyl ester), 0.1g of stannous octoate were added to 150ml of anhydrous toluene, fully dissolved to form a reaction mixture, the reaction temperature was 110°C, and the reaction time was 5h. After the reaction was complete, the solvent was removed by rotary evaporation and the product was redissolved in THF. The solution was precipitated three times in an excess of cold methanol / water mixture (2 / 1, v / v). After drying under vacuum for 24 hours, polycaprolactone (Alkyne-(PCL-OH) 2 ).

[0108] In a three-neck round bottom flask, 15g Alkyne-(PCL-OH) 2 Added to 200ml of anhydrous acetonitrile. Under a nitrogen atmosphere, add 2-bromoisobutyryl bromide (12.45 g) dropwise in 50 ml of anhydrous acetonitrile at 0°C, stir at 4°C for 24 hours after the addition, remove the solvent, and redissolve the pr...

Embodiment 2

[0118] According to the same method as in Example 1, the difference is that the weight ratio of polycaprolactone with both azido and alkynyl end caps to polystyrene with both azide and alkynyl end caps is 7:3, to prepare the whole solid electrolyte membrane.

[0119] In an argon glove box, the obtained all-solid-state electrolyte membrane was cut into 18mm discs, and stainless steel was used as a blocking electrode to assemble a button cell. The AC impedance test was carried out at room temperature, and the measured room temperature conductivity was 7.86×10 -7 S / cm. The prepared composite organic solid electrolyte uses lithium sheets and stainless steel sheets as electrodes to assemble button batteries, and conducts linear sweep voltammetry tests. The electrochemical stability window at room temperature can reach 5.6V. The prepared composite organic solid electrolyte was assembled into a button battery using lithium sheets as symmetrical electrodes, and the chronoamperometry ...

Embodiment 3

[0121] According to the same method as in Example 1, the difference is that the weight ratio of polycaprolactone having both azido and alkynyl terminations to polystyrene having both azido and alkynyl terminations is 5:5, to prepare the whole solid electrolyte membrane.

[0122] In an argon glove box, the obtained all-solid electrolyte membrane was cut into 18mm discs, and stainless steel was used as a blocking electrode to assemble a button cell. The AC impedance test was carried out at room temperature, and the measured room temperature conductivity was 1.59×10 -6 S / cm. The prepared composite organic solid electrolyte uses lithium sheets and stainless steel sheets as electrodes to assemble button batteries, and conducts linear sweep voltammetry tests, and its electrochemical stability window can reach 6.0V at room temperature. The prepared composite organic solid electrolyte was assembled into a button battery using lithium sheets as symmetrical electrodes, and the chronoam...

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Abstract

The invention discloses a polycaprolactone-based hyperbranched polymer and a preparation method thereof. The polycaprolactone-based hyperbranched polymer comprises a polycaprolactone matrix and a branched chain segment connected with the polycaprolactone matrix through a covalent bond, wherein the branched chain segment comprises at least one of polystyrene, polyvinyl cyclohexane, polymethyl acrylate and polymethyl methacrylate. The invention also discloses an all-solid-state electrolyte containing the polycaprolactone-based hyperbranched polymer, a preparation method of the all-solid-state electrolyte and a lithium ion battery containing the all-solid-state electrolyte. The polycaprolactone-based hyperbranched polymer disclosed by the invention has relatively good mechanical strength, and, as an electrolyte, has high ionic conductivity, high ionic transference number and a wide electrochemical window; the all-solid-state electrolyte prepared from the polycaprolactone-based hyperbranched polymer can be stably circulated at high temperature; a corresponding lithium ion battery can still achieve stable performance at high temperature, and the use temperature of a lithium ion batteryproduct is increased.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a polycaprolactone-based hyperbranched polymer and a preparation method thereof, an all-solid-state electrolyte containing the polycaprolactone-based hyperbranched polymer and a preparation method thereof, and a polycaprolactone-based hyperbranched polymer containing the same Lithium-ion batteries with solid electrolytes. Background technique [0002] Lithium metal has attracted widespread attention due to its excellent properties (such as high energy density, light weight, etc.), but it is difficult to actually use lithium metal as an anode material in current commercial lithium-ion battery systems. One is that the electrolyte selected in the existing lithium-ion battery system is still the electrolyte, and the electrolyte and lithium metal are unstable and prone to chemical reactions, and the electrolyte has a great safety hazard due to the flammability ...

Claims

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Application Information

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IPC IPC(8): C08G81/02C08G63/08C08G63/91C08F112/08H01M10/0525H01M10/0565
CPCC08G81/027C08G63/08C08G63/912C08F112/08H01M10/0565H01M10/0525H01M2300/0082Y02E60/10
Inventor 邓永红徐洪礼叶维
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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