A kind of flexible ceramic/polymer composite solid electrolyte and preparation method thereof

A technology of solid electrolyte and flexible ceramics, applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problems of low lithium ion conductivity, poor electrochemical stability, poor flexibility, etc., and achieve high lithium ion Effects of conductivity, high electrochemical stability, and high chemical stability

Active Publication Date: 2020-08-25
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are deficiencies such as large interface resistance to metal lithium, unstable cycle, and poor flexibility, which limit the application of lithium-containing garnet.
The polymer electrolyte, one of the solid electrolytes, can conduct lithium ions through the movement of chain segments. At the same time, it has good viscoelastic deformation ability, but the polymer electrolyte still has low lithium ion conductivity and poor The problems of electrochemical stability and mechanical stability limit the practical application of polymer electrolytes.

Method used

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  • A kind of flexible ceramic/polymer composite solid electrolyte and preparation method thereof
  • A kind of flexible ceramic/polymer composite solid electrolyte and preparation method thereof
  • A kind of flexible ceramic/polymer composite solid electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this example, azobisisobutyronitrile was used as the initiator, and lithium bistrifluoromethanesulfonimide was used as the lithium salt.

[0029] The first step: according to the mass fraction of 40%, 20% and 40%, the monomer methyl methacrylate, lithium-containing garnet powder and lithium bistrifluoromethanesulfonylimide were mixed, and added according to the methyl The mass ratio of methyl acrylate: azobisisobutyronitrile is 1:20, and an initiator is added;

[0030] Step 2: Let the above mixture stand for 12 hours to absorb the supernatant, leaving only the lower suspension;

[0031] The third step: in-situ polymerization is carried out in a closed container environment at a temperature of 10 degrees, and after 6 hours, a flexible and dense composite electrolyte is obtained.

[0032] Depend on figure 1 It can be seen that the XRD of the lithium-containing garnet prepared in Example 1 is consistent with the standard spectrum (JCPDS NO.45-0109), and it is defined ...

Embodiment 2

[0034] In this example, azobisisobutyronitrile was used as the initiator, and lithium bistrifluoromethanesulfonimide was used as the lithium salt.

[0035] The first step: according to the mass fraction of 50%, 5% and 45%, the monomer methyl methacrylate, lithium-containing garnet powder and lithium bistrifluoromethanesulfonylimide were mixed, and added according to the methyl Methyl acrylate: azobisisobutyronitrile mass ratio is 1:50, adding initiator azobisisobutyronitrile;

[0036] The second step: let the above mixture stand for 24 hours to absorb the supernatant, leaving only the lower suspension;

[0037] The third step: In-situ polymerization is carried out in a closed container environment at a temperature of 15 degrees. After 24 hours, a flexible and dense composite electrolyte is obtained.

[0038] Depend on figure 2 It can be seen that the surface of the composite electrolyte material prepared in Example 2 is uniform and dense, and the lithium-containing garnet p...

Embodiment 3

[0040] In this example, azobisisoheptanonitrile was used as the initiator, and lithium hexafluorophosphate was used as the lithium salt.

[0041] The first step: according to the mass fraction of 40%, 25% and 35%, the monomer methyl methacrylate, lithium-containing garnet powder and lithium hexafluorophosphate are mixed, and the methyl methacrylate: azobisisoheptyl Nitrile mass ratio is 1:200, adds initiator;

[0042] The second step: the above mixture was left to settle for 0.5 hours to absorb the supernatant, leaving only the suspension in the lower layer;

[0043] The third step: in-situ polymerization is carried out in a closed container environment at a temperature of 40 degrees, and after 48 hours, a flexible and dense composite electrolyte is obtained.

[0044] Depend on image 3 It can be seen that there are a large number of lithium-containing garnet ceramic particles inside the composite electrolyte material prepared in Example 3, with a diameter of about 1-5 μm, no ...

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Abstract

The invention relates to a flexible ceramic / polymer composite solid electrolyte, and a preparation method thereof. The preparation method comprises following steps: monomer methyl methacrylate, a lithium salt, lithium containing garnet powder, and an initiator are mixed, an obtained mixture is allowed to stand for a certain period of time, an obtained upper layer clear solution is removed, and in-suit polymerization is carried out at a sealed container environment at room temperature so as to obtain the composite solid electrolyte with a thickness of 50<mu>m and lithium ion room temperature conductivity of 5*10<-4>S / cm. Compared with the prior art, the advantages are that: the obtained flexible ceramic / polymer composite solid electrolyte is provided with flexibility, surface smoothness, high chemical stability, high lithium ion conductivity, and stability on metal lithium.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a flexible ceramic / polymer composite solid electrolyte and a preparation method thereof. Background technique [0002] Lithium-ion battery is one of the most important energy storage devices. Since its birth, the energy density of the battery has increased by nearly 2 times, and it has been widely used in people's production and life. How to further improve the energy density, capacity density and safety of the battery At present, it is the focus of lithium-ion battery research, and it is also a hot spot in the energy industry in recent years. Due to the use of organic liquid electrolytes in traditional lithium-ion batteries, there may be strong electrode-electrolyte side reactions, narrow applicable temperature ranges, and potential safety hazards such as flammability and explosion. For these problems, the urgent demand for batteries with high safety, high specific ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0085Y02E60/10
Inventor 段华南郑鸿鹏黑泽峘刘河洲郭益平李华陈玉洁
Owner SHANGHAI JIAOTONG UNIV
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