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Lithium battery electrode preparation method including polymer material with stable interface and application of lithium battery electrode in solid lithium battery

A technology of polymer materials and interface stabilization, which is applied in battery electrodes, lithium batteries, secondary batteries, etc.

Active Publication Date: 2016-06-22
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

Despite various efforts, researchers have been unable to successfully prepare large quantities of interfacially stabilized materials to improve the cycle stability, Coulombic efficiency, and rate performance of solid lithium batteries.

Method used

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  • Lithium battery electrode preparation method including polymer material with stable interface and application of lithium battery electrode in solid lithium battery
  • Lithium battery electrode preparation method including polymer material with stable interface and application of lithium battery electrode in solid lithium battery
  • Lithium battery electrode preparation method including polymer material with stable interface and application of lithium battery electrode in solid lithium battery

Examples

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Effect test

Embodiment 1

[0034] Add AIBN to VCA under argon protection, the mass fraction of AIBN is 0.1%; 40 o C temperature, stirring for 24 hours, to obtain PVCA polymer; PVCA polymer was dissolved in DMF, made into a 2wt.% solution. Preparation of LiFePO for Lithium Batteries Using PVCA Polymer as Binder 4 Electrode pole piece, the mass fraction of binder is 10%; LiFePO 4 The electrode pole piece is immersed in the PVCA solution for 1 minute and then taken out; at 60 o C under vacuum drying for 24 hours to ensure that the solvent has been completely volatilized to obtain PVCA polymer-coated LiFePO 4 Electrode pads.

[0035] The materials used to prepare and assemble lithium-ion batteries are shown in Table 1. The negative pole is uncoated metal lithium, and the solid electrolyte is PVCA / LiDFOB all-solid electrolyte obtained by in-situ polymerization. The first charge specific capacity of the prepared ion battery is 122mAhg -1 , the first discharge specific capacity is 119mAhg -1 , the first C...

Embodiment 2

[0039] Add BPO in the VCA under argon protection, the mass fraction of BPO is 0.5%; 80 o C temperature, stirring for 2 hours, to obtain PVCA polymer; PVCA polymer was dissolved in DMF, made into a 5wt.% solution. Using PVCA polymer as a binder to prepare graphite electrode pole pieces for lithium batteries, the mass fraction of the binder is 5%; the graphite electrode pole piece is immersed in PVCA solution for 5 minutes and then taken out; at 60 o C under vacuum drying for 24 hours to ensure that the solvent has been completely volatilized to obtain a PVCA polymer-coated graphite electrode pole piece.

[0040] The materials used to prepare and assemble lithium-ion batteries are shown in Table 1. The reference electrode is uncoated lithium metal, and the solid electrolyte is PVCA / LiTFSI all-solid electrolyte obtained by in-situ polymerization. The first charge specific capacity of the prepared ion battery is 336mAhg -1 , the first discharge specific capacity is 289mAhg -1 ,...

Embodiment 3

[0044] Add AIBN to VCA under argon protection, the mass fraction of AIBN is 1%; 60 o C temperature, stirring for 12 hours, to obtain PVCA polymer; PVCA polymer was dissolved in DMF, made into a 20wt.% solution. Preparation of LiFe for Lithium Batteries Using PVCA Polymer as Binder 0.2 mn 0.8 PO 4 Electrode pole piece, the mass fraction of binder is 20%; LiFe 0.2 mn 0.8 PO 4 The electrode pole piece is immersed in the PVCA solution for 1 minute and then taken out; at 60 o C under vacuum drying for 24 hours to ensure that the solvent has been completely volatilized to obtain PVCA polymer-coated LiFe 0.2 mn 0.8 PO 4 Electrode pads. Using PVCA polymer as a binder to prepare graphite electrode pole pieces for lithium batteries, the mass fraction of the binder is 5%; the graphite electrode pole piece is immersed in PVCA solution for 2 minutes and then taken out; at 60 o C under vacuum drying for 24 hours to ensure that the solvent has been completely volatilized to obtain ...

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Abstract

The invention discloses a lithium battery electrode preparation method including polymer material with a stable interface and the application of a lithium battery electrode in a solid lithium battery. The preparation method is characterized in that the polymer material with the stable interface is poly-vinylene carbonate (PVCA) or copolymers thereof. The free radical triggers the monomer to perform mass polymerization to obtain a polymer, the polymer material with the stable interface can form a cover film on the surface of the electrode, thus destruction on the electrode material and decomposition of the solid electrolyte on the surfaces of the positive and negative electrodes can be effectively restrained. Meanwhile, the polymer material can form a stable protection layer on the surface of lithium metal to inhibit the growth of the lithium dendrites, thus the cycle performance of the solid lithium battery is improved. The invention also provides a preparation method of the electrochemical stable polymer material, and the solid lithium battery assembled by using the polymer material.

Description

technical field [0001] The invention relates to battery technology, in particular to a method for preparing polyvinylene carbonate or its copolymer as a lithium battery electrode interface stable polymer material, and the application of the electrode interface stable polymer material in solid lithium batteries. Background technique [0002] Lithium-ion battery refers to an electrochemical device that stores and releases energy by intercalating and extracting lithium ions between the positive and negative electrodes. A lithium-ion battery is actually a lithium-ion concentration battery. When charging, lithium ions come out of the positive electrode and are inserted into the negative electrode through the electrolyte. At this time, the positive electrode is in a lithium-poor state due to the extraction of lithium ions, and the negative electrode is in a lithium-rich state due to the insertion of lithium ions. The positive electrode material that extracts lithium ions releases...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/62H01M10/052H01M10/0525H01M10/0565
CPCH01M4/139H01M4/622H01M10/052H01M10/0525H01M10/0565Y02E60/10
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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