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Polymer solid electrolyte, all-solid-state lithium battery and preparation method of all-solid-state lithium battery

A solid-state electrolyte and polymer technology, applied in all-solid-state lithium battery and its preparation, polymer solid-state electrolyte field, can solve the problems of low ionic conductivity at room temperature, low high energy density, unstable contact between positive and negative electrodes, etc. To achieve the effect of simple process steps, high conductivity, and enhanced ionic conductivity

Pending Publication Date: 2021-04-23
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide an all-solid lithium battery and its preparation method to solve the problems of low room temperature ionic conductivity, unstable positive and negative interface contact and high energy density of existing all-solid lithium batteries. low technical issues

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  • Polymer solid electrolyte, all-solid-state lithium battery and preparation method of all-solid-state lithium battery
  • Polymer solid electrolyte, all-solid-state lithium battery and preparation method of all-solid-state lithium battery
  • Polymer solid electrolyte, all-solid-state lithium battery and preparation method of all-solid-state lithium battery

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preparation example Construction

[0047] Correspondingly, based on the structure of the above-mentioned all-solid-state lithium battery, the embodiment of the present invention also provides a preparation method of the above-mentioned all-solid-state lithium battery. combine figure 2 , the preparation method of all-solid-state lithium battery comprises the following steps:

[0048] S01: preparing polymer electrolyte precursor solution 2';

[0049] S02: placing the positive electrode 1 in the polymer electrolyte precursor solution 2' for infiltration treatment;

[0050] S03: form a polymer solid electrolyte precursor layer on the surface of the positive electrode 1 after the infiltration treatment including the polymer electrolyte precursor solution 2';

[0051] S04: setting the negative electrode 3 on the surface of the polymer solid electrolyte precursor layer away from the positive electrode 1, and then performing cross-linking and curing treatment.

[0052] Wherein, the polymer electrolyte precursor sol...

Embodiment 11

[0067] This embodiment provides a polymer solid electrolyte. The polymer solid electrolyte of this embodiment includes a porous membrane layer and a polymer electrolyte formed on the three-dimensional structure of the porous membrane layer and its surface. Among them, the polymer electrolyte is formed by polymerizing the polymer electrolyte precursor solution with the following formula:

[0068] Trimethylpropane triglycidyl ether (TTE) 0.09g, 1,3-dioxane (DOL) 4ml, lithium trifluoromethanesulfonate imide (LiTFSI) 1.14g, lithium tetrafluoroborate (LiBF 4 ) 0.07g.

[0069] Preparation method of polymer solid electrolyte: under the protection of argon atmosphere, take 0.09g of trimethylpropane triglycidyl ether (TTE) and add it to 4ml of 1,3-dioxane (DOL), add 1.14g of bistrifluoro Lithium methanesulfonate imide (LiTFSI), magnetically stirred evenly and then added 0.07g lithium tetrafluoroborate (LiBF 4 ), continue the magnetic stirring, and obtain the polymer precursor soluti...

Embodiment 12

[0072] This embodiment provides a polymer solid electrolyte. The polymer solid electrolyte in this example is formed by polymerizing the polymer electrolyte precursor solution with the following formula (compared with Example 11, which does not contain a porous diaphragm layer):

[0073] Trimethylpropane triglycidyl ether (TTE) 0.09g, 1,3-dioxane (DOL) 4ml, lithium trifluoromethanesulfonate imide (LiTFSI) 1.14g, lithium tetrafluoroborate (LiBF 4 ) 0.07g.

[0074] Preparation method of polymer solid electrolyte: under the protection of argon atmosphere, take 0.09g of trimethylpropane triglycidyl ether (TTE) and add it to 4ml of 1,3-dioxane (DOL), add 1.14g of bistrifluoro Lithium methanesulfonate imide (LiTFSI), magnetically stirred evenly and then added 0.07g lithium tetrafluoroborate (LiBF 4 ), continue the magnetic stirring, and obtain the polymer precursor solution after stirring evenly. Stand still for 24h to obtain a fully cross-linked and cured polymer solid state ele...

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Abstract

The invention discloses a polymer solid electrolyte, an all-solid-state lithium battery and a preparation method of the all-solid-state lithium battery. The all-solid-state lithium battery comprises a positive electrode, a polymer solid-state electrolyte layer and a negative electrode, the positive electrode, the polymer solid-state electrolyte layer and the negative electrode are sequentially stacked, and the polymer solid-state electrolyte layer is integrally formed by in-situ polymerization reaction of a polymer electrolyte precursor solution, the positive electrode and the negative electrode. The bonding strength between the polymer solid electrolyte layer contained in the all-solid-state lithium battery and the positive and negative electrodes is high, the ionic conductivity of the polymer solid electrolyte layer is enhanced, and the electrochemical performance is stable. The preparation method of the all-solid-state lithium battery can effectively guarantee the stable performance of the prepared all-solid-state lithium battery. The polymer solid electrolyte provided by the invention can well dissociate the first lithium salt, has high conductivity and high flexibility, and is beneficial to the conduction of lithium ions in the electrolyte, so that the polymer solid electrolyte has the characteristic of high ionic conductivity at room temperature.

Description

technical field [0001] The invention belongs to the technical field of all-solid-state batteries, and in particular relates to a polymer solid-state electrolyte, an all-solid-state lithium battery and a preparation method thereof. Background technique [0002] Wearable, flexible electronics represent a major shift in consumer electronics, and flexible lithium batteries that can be seamlessly integrated with functional devices are crucial for wearable electronics. In the past ten years, both academic and industrial circles have tried their best to realize the flexibility of lithium-ion batteries. However, due to the low energy-to-weight ratio of active materials in lithium-ion batteries, thicker electrodes are required, so good battery flexibility cannot be achieved at the same time. with high energy density. [0003] Among them, metal lithium has attracted much attention because of its lowest electrochemical potential (-3.04V vs. SHE) and high specific energy density (theor...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0082Y02E60/10Y02P70/50
Inventor 邓永红文书静常建罗超安亚楠
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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