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A composite solid electrolyte membrane and its preparation method, solid-state battery

A solid-state electrolyte membrane, solid-state electrolyte technology, applied in electrolytes, secondary batteries, circuits, etc., can solve the problem of not taking into account high voltage resistance, high ionic conductivity, etc.

Active Publication Date: 2021-09-07
郑州宇通集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a composite solid electrolyte membrane, so as to solve the problems existing in the existing organic / inorganic composite electrolyte membrane that cannot take into account high pressure resistance, high ion conductivity, inhibition of lithium dendrites, and mitigation of negative electrode volume expansion.

Method used

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  • A composite solid electrolyte membrane and its preparation method, solid-state battery
  • A composite solid electrolyte membrane and its preparation method, solid-state battery

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Embodiment 1

[0031] The composite solid electrolyte membrane of this embodiment, the structure diagram is as follows figure 1 As shown, the composite solid electrolyte membrane 1 includes a positive electrode side electrolyte layer 10, an intermediate electrolyte layer 11 and a negative electrode side electrolyte layer 12, and the positive electrode side electrolyte layer 10, the intermediate electrolyte layer 11 and the negative electrode side electrolyte layer 12 are all composed of polymer electrolytes 2 and Inorganic solid electrolyte 3 composition.

[0032] The thicknesses of the positive electrode side electrolyte layer 10, the intermediate electrolyte layer 11, and the negative electrode side electrolyte layer 12 are 5 μm, 10 μm, and 5 μm respectively. In the above three layers, the mass content of the inorganic solid electrolyte is 95%, 50%, and 5%, respectively. The mass contents of the electrolytes are 5%, 50%, and 95%, respectively.

[0033] The inorganic solid electrolyte is gar...

Embodiment 2

[0039] The composite solid electrolyte membrane of this embodiment contains two electrolyte layers, namely a positive electrode side electrolyte layer and a negative electrode side electrolyte layer, and both the positive electrode side electrolyte layer and the negative electrode side electrolyte layer are composed of polymer electrolytes and inorganic solid electrolytes.

[0040] Both the electrolyte layer on the positive electrode side and the electrolyte layer on the negative electrode side have a thickness of 10 μm. In the electrolyte layer on the positive electrode side, the content of inorganic solid electrolyte is 95%, and the content of polymer electrolyte is 5%. In the electrolyte layer on the negative electrode side, the content of inorganic solid electrolyte is The content of polymer electrolyte is 5%, and the content of polymer electrolyte is 95%. The material composition of the inorganic solid electrolyte and the polymer electrolyte is the same as in Example 1.

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Abstract

The invention relates to a composite solid electrolyte membrane, a preparation method thereof, and a solid battery. The composite solid electrolyte membrane includes a multilayer electrolyte layer composited in the thickness direction, the electrolyte layer contains an inorganic solid electrolyte and a polymer electrolyte, and in the direction from the positive electrode side to the negative electrode side of the composite solid electrolyte membrane, in each electrolyte layer, The content gradient of the inorganic solid electrolyte decreases, and the content gradient of the polymer electrolyte increases. The composite solid electrolyte membrane provided by the present invention has a high content of inorganic solid electrolyte on the positive electrode side, can withstand higher voltages, improves lithium ion conductance, and has a high content of polymer electrolyte on the negative electrode side, which can better inhibit lithium dendrites and alleviate The volume expansion of the negative electrode and the differentiated design of the electrolyte membrane make full use of the characteristics of the positive and negative electrodes. While ensuring high ionic conductivity, it achieves high pressure resistance and suppresses the volume expansion of lithium dendrites and negative electrodes.

Description

technical field [0001] The invention belongs to the field of solid-state electrolyte membranes, and in particular relates to a composite solid-state electrolyte membrane, a preparation method thereof, and a solid-state battery. Background technique [0002] The development of new energy vehicles is of great significance for alleviating environmental pollution and energy crisis. The power battery as an energy source plays a decisive role in the performance of new energy vehicles. Lithium-ion batteries have become the first choice for new energy vehicle batteries due to their advantages such as high energy density, high power density, long life, and no memory effect. [0003] The rapid development of new energy vehicles has put forward higher requirements for the safety and energy density of power battery systems. Currently, liquid lithium-ion batteries used in mainstream power batteries have certain safety hazards because they contain liquid organic electrolytes, and their T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0091H01M2300/0094Y02E60/10
Inventor 李云明周时国曹瑞中廖华平尹利超彭能岭
Owner 郑州宇通集团有限公司
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