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Quasi-solid-state lithium battery and preparation method thereof

A quasi-solid-state, lithium battery technology, used in secondary batteries, solid electrolytes, secondary battery repair/maintenance, etc., can solve the problems of battery cycle performance decline, liquid electrolyte reducing battery safety, etc., to enhance the inhibition of lithium branching. The ability to crystallize and the effect of not easy to crystallize and high lithium ion conductivity

Active Publication Date: 2020-02-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems in the prior art, the present invention discloses a quasi-solid-state lithium battery and a preparation method thereof. The quasi-solid-state lithium battery solves the problem that the liquid electrolyte reduces the safety of the battery, and also avoids the need for solid-state polymer electrolytes. The problem of degradation of battery cycle performance caused by the dissolution of

Method used

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  • Quasi-solid-state lithium battery and preparation method thereof
  • Quasi-solid-state lithium battery and preparation method thereof
  • Quasi-solid-state lithium battery and preparation method thereof

Examples

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Embodiment 1

[0065] Ethoxylated trimethylolpropane triacrylate monomer and polyethylene glycol methyl ether methyl methacrylate monomer (molar ratio is 1:10, in which polyethylene glycol methyl ether methyl methacrylate monomer Body) (polyethylene glycol methyl ether methyl methacrylate monomer number average molecular weight is 500g / mol, CAS number: 26915-72-0), Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 Fluoroethylene carbonate / triethyl phosphate / 1,1,2,2-tetrafluoroethylene of ceramic powder (particle size 30-50nm), 0.9mol / L lithium hexafluorophosphate and 0.1mol / L lithium difluorooxalate borate Base-2,2,2-trifluoroethyl ether (volume ratio 1:1:1) solution is mixed with liquid electrolyte (monomer, ceramic electrolyte, lithium salt weight ratio 1:0.2:0.1), and passed Stir fully and evenly to obtain a quasi-solid electrolyte precursor; combine lithium negative electrode, quasi-solid electrolyte precursor, commercial Celgard diaphragm and LiNi 0.8 co 0.1 Ni 0.1 o 2 The positive electrode is as...

Embodiment 2

[0075] The preparation of the quasi-solid-state lithium battery is similar to that of Example 1, except that the organic solvent used in the preparation of the quasi-solid-state electrolyte precursor is only fluoroethylene carbonate / triethyl phosphate (volume ratio of 1:1), without using 1, 1,2,2-Tetrafluoroethyl-2,2,2-trifluoroethyl ether. Experiments have shown that at this time in the quasi-solid electrolyte, the ceramic nanoparticles cannot be uniformly dispersed, the mechanical properties, thermal stability, and lithium ion conductivity of the quasi-solid electrolyte are not ideal, and the cross-linked structure of the polymer is not complete. After 100 cycles at 1C, the capacity retention is only 72%.

Embodiment 3

[0077] The preparation of the quasi-solid-state lithium battery is similar to that of Example 1, except that lithium hexafluorophosphate is used as the lithium salt instead of lithium difluorooxalate borate. Experiments have shown that no compound containing fluorine, phosphorus and boron is formed on the surface of the electrode, which cannot effectively protect the positive and negative electrodes. After 100 cycles at 1C, the capacity retention is only 75%.

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Abstract

The invention discloses a quasi-solid-state lithium battery and a preparation method thereof. The quasi-solid-state lithium battery comprises a negative electrode, a positive electrode and a diaphragm, and also comprises a quasi-solid-state electrolyte dispersed among the surfaces of the negative electrode, the positive electrode and the diaphragm and gaps among the negative electrode, the positive electrode and the diaphragm. The quasi-solid-state electrolyte comprises a polymer phase, and a ceramic electrolyte, a lithium salt and a flame-retardant organic solvent which are dispersed in the polymer phase, wherein the polymer phase is formed by in-situ polymerization of composite acrylate monomers; and the composite acrylate monomer comprises a star-shaped acrylate monomer and a chain-shaped acrylate monomer. According to the quasi-solid-state lithium battery disclosed by the invention, the problem that the safety of the battery is reduced by liquid electrolyte is solved, and the problem that the cycle performance of the battery is reduced due to dissolution of solid polymer electrolyte is also avoided. Therefore, the quasi-solid-state lithium battery has excellent safety performance, high conductivity and excellent cycling stability.

Description

technical field [0001] The invention relates to the field of novel quasi-solid-state batteries, in particular to a quasi-solid-state lithium battery and a preparation method thereof. Background technique [0002] With the rapid development of the new energy vehicle industry, the requirements for the energy density of power batteries are getting higher and higher, but with the increase of battery energy density, the safety of batteries is facing challenges, especially metal lithium batteries that directly use metal lithium anodes. [0003] Traditional lithium batteries generally use organic carbonate-based liquid electrolytes, which are flammable and easily cause safety problems. In addition, in the liquid metal lithium battery directly using the lithium negative electrode, metal lithium is easy to form dendrites during repeated charging and discharging, and it is easy to pierce the separator and cause safety problems. By replacing the liquid electrolyte with a solid electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/42
CPCH01M10/0562H01M10/4235H01M2300/0065Y02E60/10
Inventor 谢健孙秋实赵新兵
Owner ZHEJIANG UNIV
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