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Polymer in-situ modified inorganic solid electrolyte ceramic wafer and preparation

A technology of solid electrolyte and in-situ modification, applied in solid electrolyte, non-aqueous electrolyte, non-aqueous electrolyte battery, etc., can solve problems such as large interface impedance, change of electrolyte structure, affecting electrochemical performance of solid-state lithium battery, etc., and achieve stable cycle , the effect of reducing the interface impedance

Inactive Publication Date: 2020-11-13
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to its hard characteristics, when it is in direct contact with the positive and negative electrodes and assembled, the interface impedance is large, and lithium ions cannot pass through the positive electrode / electrolyte and electrolyte / negative electrode interfaces smoothly during charging and discharging, which seriously affects the electrochemical performance of solid-state lithium batteries.
At the same time, when the oxide solid electrolyte is in direct contact with the metal lithium negative electrode with strong reducibility, some components will be reduced, which will cause the structure of the electrolyte to change and seriously reduce its lithium ion conductivity.

Method used

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  • Polymer in-situ modified inorganic solid electrolyte ceramic wafer and preparation
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  • Polymer in-situ modified inorganic solid electrolyte ceramic wafer and preparation

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preparation example Construction

[0034] The invention provides a method for preparing an inorganic solid electrolyte ceramic sheet modified in situ by a polymer, and obtains a polymer-inorganic solid electrolyte ceramic sheet-polymer sandwich structure, which can be:

[0035] PVCA-Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 -PEO;

[0036] or PVCA-Li 1.4 Al 0.4 Ge 1.6 (PO 4 ) 3 -PAN;

[0037] or PVCA-Li 6.5 La 3 Zr 1.5 Ta 0.5 o 12 -PVDF;

[0038] or PVCA-Li 7 La 3 Zr 2 o 12 -PVDF-HFP;

[0039] or PVCA-Li 6.4 La 3 Zr 1.4 Nb 0.6 o 12 -PPC etc.

[0040] The above simply enumerates several possible situations, which are not intended to limit the present invention.

Embodiment 1

[0042] 1) Preparation of nanoscale lithium aluminum titanium phosphate (LATP) powder by ball milling

[0043] Solid-phase reaction process: Weigh lithium carbonate, alumina, titanium dioxide, and ammonium dihydrogen phosphate according to the stoichiometric ratio and grind them evenly. Take about 100 zirconia balls with a diameter of 6 mm, and take 15 mL of acetone as a solvent. The preliminary product was obtained by ball milling for 8 hours, followed by drying at 70° C. for 12 hours and sieving to obtain the solid-phase reaction product.

[0044] Crystallization process: put the solid-phase reaction product in a corundum crucible and place it in a muffle furnace as a whole, heat up to 900°C at a rate of 2°C / min, keep it warm for 2 hours, and then cool down with the furnace. A crystalline product is obtained after trituration.

[0045] Secondary ball milling process: In order to reduce the particle size of the product and alleviate the agglomeration phenomenon, the secondary...

Embodiment 2

[0056] Compared with Example 1, the difference is that germanium dioxide is used to replace titanium dioxide in the preparation process of the ball milling method, and the rest of the process is completely consistent with Example 1.

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Abstract

The invention discloses a polymer in-situ modified inorganic solid electrolyte ceramic wafer and preparation, and belongs to the field of solid-state lithium batteries. The preparation comprises the steps of firstly, preparing a VC precursor solution containing a plasticizer and a polymer electrolyte solution; and then curing a polymer modification layer on one side of the inorganic ceramic waferto be in contact with a negative plate, then adding the VC precursor solution between the positive plate and the inorganic ceramic wafer during battery assembly, and carrying out polymerization reaction to obtain the polymer in-situ modified inorganic solid electrolyte. The method is simple in process, low in energy consumption and obvious in cost advantage, so that industrial production is facilitated. The interface transmission impedance is greatly reduced, the transmission capability of lithium ions is improved, and the assembled battery shows good electrochemical performance. The polymer in-situ modified inorganic solid electrolyte ceramic wafer can be applied to NCM, NCA, LiCoO2 and other high-voltage battery systems.

Description

technical field [0001] The invention relates to a preparation method of a polymer interface modified inorganic solid electrolyte ceramic sheet. Specifically, it relates to a polymer-inorganic ceramic sheet-polymer sandwich solid-state electrolyte structure with low interfacial transmission impedance and good electrochemical performance that can be used as a solid-state lithium battery. It belongs to the field of solid-state lithium batteries. [0002] technical background [0003] With the continuous development of the world economy and people's continuous pursuit of a better life, new energy vehicles, portable digital devices and other products have entered thousands of households, and people have higher requirements for chemical power supplies that provide energy. As an efficient energy storage device, lithium-ion batteries have the advantages of high energy density, high output power, high voltage, low self-discharge, wide operating temperature, no memory effect and envir...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0565H01M10/052
CPCH01M10/052H01M10/0562H01M10/0565H01M2300/0068H01M2300/0082Y02E60/10
Inventor 郑言贞姚怡鑫杨宁宁吴启兵杨林江陶霞
Owner BEIJING UNIV OF CHEM TECH
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