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In-situ regulation and control method for solid electrolyte interface layer of lithium battery

A solid electrolyte and interface layer technology, which is applied in the manufacture of lithium batteries, non-aqueous electrolyte batteries, and electrolyte batteries, etc., can solve the problems of poor contact between electrodes and solid electrolyte interfaces, poor cycle stability and rate performance of solid lithium ion batteries, and impedance. In order to achieve the effect of enhancing the electron transport ability, inhibiting the growth of lithium dendrites, and reducing the interface impedance

Pending Publication Date: 2021-04-06
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem that the electrode of the all-solid-state lithium-ion battery and the solid-state electrolyte interface are not well contacted, and the impedance is too large, resulting in poor cycle stability and rate performance of the solid-state lithium-ion battery during charging and discharging, the present invention provides a solid-state lithium battery Method for In Situ Regulation of Electrolyte Interface Layer

Method used

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  • In-situ regulation and control method for solid electrolyte interface layer of lithium battery
  • In-situ regulation and control method for solid electrolyte interface layer of lithium battery
  • In-situ regulation and control method for solid electrolyte interface layer of lithium battery

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Embodiment 1

[0028] The method for in-situ regulation of the solid-state electrolyte interface layer of a lithium battery is to prepare a polymer conductive layer in-situ at the interface of the solid-state electrode electrolyte, comprising the following technical steps:

[0029] The mass of organic monomer thiophene, organic polymer PEO, and lithium salt bistrifluoromethanesulfonimide based lithium accounted for 7.7%, 77%, and 15.3% of the mass of the electrolytic membrane, and 1.30 g of the obtained solid electrolyte was dissolved in 20 ml of acetonitrile Among them, the magnetic stirring is dissolved for 18-36h to form a uniform and transparent solution, which is cast in a circular polytetrafluoroethylene mold with a diameter of 90cm, and is dried in a segmented vacuum. Dry at 35-50°C for 23-25 ​​hours; then dry at a pressure of 0.05-0.1Mpa and a temperature of 35-50°C for 23-25 ​​hours to remove the solvent to obtain a solid electrolyte membrane.

[0030] (2) Cut the solid electrolyte ...

Embodiment 2

[0034] The difference from Example 1 is that in Example 2, 2,2`-bithiophene is used as the organic monomer, and the addition amount is consistent with that of thiophene, wherein the content of PEO is 77%, and the content of 2,2`-bithiophene accounts for 7.7% and bistrifluoromethanesulfonimide lithium content accounted for 15.3%, and the rest are the same, and will not be repeated in this embodiment.

Embodiment 3

[0036] The difference from Example 1 is that in Example 3, pyrrole is used as the organic monomer, and the addition amount is doubled compared with Example 1, wherein the content of PEO is 71.4%, the content of 2,2'-dithiophene accounts for 14.3% and The bistrifluoromethanesulfonimide lithium content accounts for 14.3%, and the rest are the same, and assembled into a CR2025 type symmetrical / asymmetrical battery. For the assembled asymmetric battery, place it in the blue battery charging and discharging instrument, set the charging and discharging voltage range 2 to 2.5V and the current as 5μA, and charge and discharge 300 times at a constant current; for the assembled symmetrical battery, on the electrochemical workstation, the voltage is optimal 0 ~ 1.0V and current 5μA, constant current charge and discharge 300 times. The remaining steps are the same as those in Embodiment 1, and will not be repeated in this embodiment.

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Abstract

The invention discloses an in-situ regulation and control method for a solid electrolyte interface layer of a lithium battery, which comprises the following steps of (1) casting a solution formed by an organic polymer, an organic monomer and a lithium salt into a polytetrafluoroethylene mold, and carrying out sectional vacuum drying to obtain a solid electrolyte membrane, (2) assembling the solid electrolyte membranes into a battery according to the sequence of a positive electrode material-electrolyte membrane-negative electrode material, and (3) carrying out electrochemical polymerization on the assembled battery under the conditions that the temperature is 50-80 DEG C, the voltage is 0-2.5 V and the constant current is 4.9-5.1 muA, and forming a polymer conductive layer of an electron / ion mixed conductor on an electrolyte interface of a solid electrode. The conductive polymer grows in the solid electrolyte membrane, and the electrode and the electrolyte interface are tightly connected on the atomic layer, so that the problems of poor contact and overlarge impedance between the electrode and the electrolyte membrane interface can be effectively solved, and the interface stability, the cycling stability and the rate capability of the solid-state lithium ion battery are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state lithium batteries, in particular to a method for in-situ regulation of a solid-state electrolyte interface layer of a lithium battery. Background technique [0002] All-solid-state lithium-ion batteries are considered to be the next generation of secondary batteries with high safety and high energy density. Solid-state electrolytes instead of liquid electrolytes can effectively solve the shortcomings of flammable and explosive organic electrolytes in traditional lithium-ion batteries. Compatible with metallic lithium anodes, it slows down the interface degradation between the electrolyte membrane and the lithium metal electrode, prevents dendrite growth, and at the same time achieves high specific capacity performance. [0003] However, the solid-solid contact between the electrode and the solid-state electrolyte has serious interfacial contact resistance, and the contact is not good, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052H01M10/058C08G61/12C08G73/02
CPCH01M10/0565H01M10/052H01M10/058C08G61/126C08G61/124C08G73/0266C08G2261/44C08G2261/516C08G2261/3223C08G2261/3221C08G2261/11Y02E60/10Y02P70/50
Inventor 孙呈郭安百钢郑金刚李峰刘少军
Owner UNIV OF SCI & TECH LIAONING
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