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Vinylene carbonate-based lithium ion battery polymer electrolyte and preparation method as well as application thereof

A polyvinylene carbonate-based lithium and polyvinylene carbonate-based technology is applied in the application field of room temperature all-solid-state lithium-ion batteries, and can solve the problems of low discharge specific capacity, low ionic conductivity, low mechanical strength, etc. High ionic conductivity, easy availability of materials, and good safety

Active Publication Date: 2016-08-03
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these polymers have certain disadvantages: polyvinylidene fluoride-hexafluoropropylene, polyacrylonitrile, polyacrylamide, and polymethyl methacrylate are commonly used as gel polymer electrolytes, which have high ionic conductivity, but due to the low mechanical strength of the gel polymer electrolyte, it is easy to short-circuit the battery when it is violently impacted.
Commonly used polymer electrolyte matrices for lithium-ion batteries are mainly polyethylene oxide, polyvinylidene fluoride, polymethyl methacrylate, and polyacrylonitrile, and the above-mentioned matrices are difficult to solve due to problems such as low ionic conductivity and low discharge specific capacity. Promoted in lithium batteries

Method used

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  • Vinylene carbonate-based lithium ion battery polymer electrolyte and preparation method as well as application thereof
  • Vinylene carbonate-based lithium ion battery polymer electrolyte and preparation method as well as application thereof
  • Vinylene carbonate-based lithium ion battery polymer electrolyte and preparation method as well as application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The LiBOB / VCA solution was prepared in a glove box filled with argon, and after adding AIBN to the LiBOB / VCA solution, the solution was injected into a lithium battery with cellulose as a support material. The battery is placed in 60 o After heating at C for 6 hours, VCA polymerized in situ inside the battery to obtain a polymer, and at the same time compounded with support materials and lithium salts to obtain a polymer electrolyte for lithium-ion batteries.

[0042] The mass fraction of AIBN in the LiBOB / VCA solution was 0.1%.

[0043] The ratio of raw materials used to prepare polymer electrolytes for lithium-ion batteries is shown in Table 1. The ion conductivity of polymer electrolytes for lithium-ion batteries prepared at room temperature is 5.3×10 -5 S / cm, the initial decomposition voltage is 5.2V.

[0044] Table 1:

[0045]

Embodiment 2

[0047] MAH was added to VCA in an argon-filled glove box to prepare a LiTFSI / VCA-MAH solution. After adding AIBN to the LiTFSI / VCA-MAH solution, the solution was injected into a lithium battery with cellulose as a support material. The battery is placed in 40 o After heating at C for 12 hours, VCA-MAH polymerized in situ inside the battery to obtain a copolymer, and at the same time compounded with support materials and lithium salts to obtain a lithium-ion battery polymer electrolyte.

[0048] The mass ratio of VCA and MAH was 5:5, and the mass fraction of AIBN in LiTFSI / VCA-MAH solution was 0.5%.

[0049] The ratio of raw materials used to prepare polymer electrolytes for lithium-ion batteries is shown in Table 2. The ion conductivity of polymer electrolytes for lithium-ion batteries prepared at room temperature is 2.9 × 10 -4 S / cm, the initial decomposition voltage is 5.2V.

[0050] Table 2:

[0051]

Embodiment 3

[0053] Preparation of LiClO by adding VAc to VCA in an argon-filled glove box 4 / VCA-VAc solution, to LiClO 4 After adding AIBN to the VCA-VAc solution, the solution was injected into a lithium battery supported by glass fiber. The battery is placed in 60 o After heating at C for 8 hours, VCA-VAc polymerized in situ inside the battery to obtain a copolymer, and at the same time compounded with support materials and lithium salts to obtain a lithium-ion battery polymer electrolyte.

[0054] Wherein the mass ratio of VCA and MAH is 8:2, AIBN is in LiClO 4 The mass fraction in VCA-VAc solution is 0.8%.

[0055] The ratio of raw materials used to prepare polymer electrolytes for lithium-ion batteries is shown in Table 3. The ion conductivity of polymer electrolytes for lithium-ion batteries prepared at room temperature is 1.7×10 -4 S / cm, the initial decomposition voltage is 4.6V.

[0056] table 3:

[0057]

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Abstract

The invention discloses a vinylene carbonate-based lithium ion battery polymer electrolyte and a preparation method as well as application thereof in a room-temperature full-solid lithium ion battery. The vinylene carbonate-based lithium ion battery polymer electrolyte comprises vinylene carbonate or a copolymer of vinylene carbonate, lithium salt, a porous backing material and an additive, wherein the molecular weight of a vinylene carbonate-based polymer is 172-1*10<7> Da; the ionic conductivity of the vinylene carbonate-based polymer electrolyte is 1*10<-3>-1*10<-5>S / cm at 25 DEG C; the initial decomposition voltage range is 4.5-5.2 V vs.Li<+> / Li. The vinylene carbonate-based electrolyte is prepared by the in-situ polymerization method, so that the electrolyte has excellent interfacial compatibility with electrodes. The vinylene carbonate-based polymer electrolyte can be used in the room-temperature full-solid lithium ion battery; the vinylene carbonate-based polymer electrolyte is excellent in electrochemical oxidation reduction stability, and can be used in high voltage resistant polymer electrolyte materials. The invention further provides the preparation method of the vinylene carbonate-based lithium ion battery polymer electrolyte, and a lithium ion battery made of the electrolyte.

Description

technical field [0001] The invention relates to battery technology, specifically a lithium-ion battery obtained by in-situ polymerization of vinylene carbonate or a multi-component comonomer containing vinylene carbonate under the action of an initiator, and compounding with support materials, lithium salts, and additives Polymer electrolytes and polyvinylene carbonate-based lithium-ion batteries Polymer electrolytes are used in all-solid-state lithium-ion batteries at room temperature. Background technique [0002] Due to its high energy density and good reliability, lithium-ion batteries have been developed by leaps and bounds in the past three decades. Lithium-ion battery electrolytes are mostly organic solvents, such as ethylene carbonate, propylene carbonate, etc. However, safety issues such as leakage, fire, and explosion of lithium-ion batteries caused by traditional liquid electrolytes have seriously hindered the further popularization of lithium-ion batteries. Pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525C08F118/02C08F218/02
CPCC08F118/02C08F218/02H01M10/0525H01M10/0565H01M2300/0082C08F222/06C08F218/08C08F228/02C08F220/44Y02E60/10
Inventor 崔光磊柴敬超刘志宏崔子立王庆富张建军姚建华刘海胜
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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