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Positive electrode plate and polymer electrolyte membrane combined piece and preparation method thereof

A technology of electrolyte membrane and positive pole piece, which is applied in the field of preparation of positive electrode material pole piece of solid-state battery, can solve the problems of insufficient solid-solid interface contact and large impedance, and achieves improved electrochemical performance, improved compatibility, and improved Coulombic efficiency. Effect

Active Publication Date: 2019-10-11
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0009] In order to solve the above-mentioned problems, the present inventors have carried out intensive research and found that: the process of using the polymer electrolyte matrix as a binder and performing high-temperature melting treatment on the positive electrode sheet and the solid electrolyte can solve the problems in the solid-state battery to a certain extent. Insufficient solid-solid interface contact and excessive impedance, the coating of the ceramic-based solid electrolyte in the positive electrode sheet not only helps to improve the electrochemical performance of the positive electrode material, but also improves the compatibility between the positive electrode and the solid electrolyte sheet; in addition, The addition of lithium salt can also effectively improve the coulombic efficiency of the battery, and give full play to the advantages of the electrode material, thereby completing the present invention

Method used

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  • Positive electrode plate and polymer electrolyte membrane combined piece and preparation method thereof
  • Positive electrode plate and polymer electrolyte membrane combined piece and preparation method thereof
  • Positive electrode plate and polymer electrolyte membrane combined piece and preparation method thereof

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preparation example Construction

[0031] The invention provides a method for preparing a combined sheet of a positive electrode sheet and a polymer electrolyte membrane, the method comprising the following steps:

[0032] Step (1), performing high-energy ball milling on the positive electrode active material and the ceramic-based solid electrolyte, so that the surface of the positive electrode active material is coated with the ceramic-based solid electrolyte, and set aside;

[0033] Preferably, the positive electrode active material is selected from lithium cobalt oxide (LCO), lithium iron phosphate (LFP), ternary positive electrode (NCM / NCA), lithium manganese oxide (LMO), spinel lithium nickel manganese oxide (LNMO ) and one or more of lithium-rich manganese bases; preferably lithium iron phosphate or lithium cobaltate;

[0034] Preferably, the ceramic-based solid electrolyte is one or more of lithium aluminum titanium phosphate (LATP), lithium aluminum germanium phosphate (LAGP), lithium lanthanum zirconiu...

Embodiment 1

[0078] After batching lithium iron phosphate (LFP) and lithium aluminum titanium phosphate (LATP) according to a mass ratio of 100:1, ball milling was carried out at a ball milling speed of 350 rpm for 6 hours to obtain lithium iron phosphate coated with LATP on the surface.

[0079] Weigh 5g of PEO with a molecular weight of 600,000 and disperse evenly in 25ml of DMF solvent under heating. After the solution is clarified, slowly add LiTFSI and stir until completely dissolved. Wherein, the molar ratio of monomer in PEO to lithium in LiTFSI is 16:1.

[0080] Take 20ml of the above solution, add 0.02g LATP into it, stir evenly, pour it directly on a polytetrafluoroethylene (PTFE) mold, and evaporate the solvent in a 50 degree oven to make a polymer electrolyte membrane.

[0081] At the same time, take 8g of lithium iron phosphate coated with LATP on the surface and 1g of carbon black, add them to the remaining DMF solution, continue to stir to form a uniform slurry, and coat it ...

Embodiment 2

[0086] Lithium cobalt oxide (LCO) and lithium aluminum titanium phosphate (LATP) were dosed according to a mass ratio of 100:1, and ball milled at a ball milling speed of 350 rpm for 6 hours to obtain lithium cobalt oxide coated with LATP on the surface.

[0087] Weigh 5g of PAN with a molecular weight of 150,000, and evenly disperse it in 25ml of DMF solvent under heating. After the solution is clarified, slowly add LiTFSI and stir until it is completely dissolved to obtain a PAN-LiTFSI polymer electrolyte. Among them, the molar ratio of monomer in PAN to lithium in LiTFSI is 12:1.

[0088] Take 20ml of the above solution, add 0.04g LATP to it, stir evenly, pour it directly on a polytetrafluoroethylene (PTFE) abrasive tool, and evaporate the solvent to dryness at 50°C to form a polymer electrolyte membrane.

[0089] At the same time, take 6g of lithium cobaltate coated with LATP on the surface and 3g of carbon black, add them to the remaining polymer electrolyte solution, con...

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Abstract

The invention provides a preparation method of a positive electrode plate and polymer electrolyte membrane combined piece. The preparation method comprises the following steps: (1) carrying out ball-milling treatment on a positive active material and a ceramic-based solid electrolyte; (2) under heating, dissolving a polymer binder in an organic solvent, adding lithium salt, and performing stirringto completely dissolve the lithium salt; (3) taking the solution obtained at the step (2), adding a ceramic-based solid electrolyte, performing stirring, pouring the mixture into a mold, and evaporating the solvent to dryness to prepare a polymer electrolyte membrane; (4) taking the solution prepared at the step (2), adding the positive active material and the conductive additive at the step (1),performing stirring, coating an aluminum foil with the solution, and performing drying to obtain a positive electrode plate; (5) tabletting the positive electrode plate, combining positive electrodeplate with the polymer electrolyte membrane at the step (3), performing tabletting, and carrying out melting treatment to obtain the combined piece. According to the method, the compatibility of the positive electrode plate and the electrolyte membrane can be improved, the solid-solid interface contact of the solid-state battery is increased, and the impedance is reduced; the coulombic efficiencyof the battery is effectively improved, and the advantages of the electrode material are fully exerted.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a preparation method and application of a solid-state battery anode material pole piece. Background technique [0002] Lithium-ion batteries are electrochemical energy storage systems with the highest energy density that have been applied. With the application of lithium-ion batteries in power vehicles and large-scale energy storage, the market has put forward higher requirements for its energy density and safety performance. [0003] From the perspective of energy density, the capacity of graphite anode in existing lithium-ion battery anode materials can reach more than 300mAhg-1, and silicon-carbon composite anodes with higher capacity have also begun to be used in a small range; while cathode materials are difficult to break through 200mAhg -1, becoming the main factor limiting the improvement of the energy density of lithium-ion batteries. Starting from the composition ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M4/1391H01M4/1397H01M10/0562H01M10/0525
CPCH01M10/058H01M4/1391H01M4/1397H01M10/0562H01M10/0525H01M2300/0068H01M2300/0071Y02E60/10Y02P70/50
Inventor 周玉林沈恋白珍辉魏卫刘海强高志平卢兴华赵广彬沙金苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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