Low-internal-resistance solid sulfide electrolyte lithium battery cell, battery and preparation method thereof

Abstract

The invention relates to an all-solid-state lithium battery of a sulfide electrolyte, and discloses a low-internal-resistance solid sulfide electrolyte lithium battery cell, a battery and a preparation method thereof. Key points of the technical scheme of the low-internal-resistance solid sulfide electrolyte lithium battery cell are as follows: a positive electrode layer, an electrolyte layer anda negative electrode layer are formed by sequentially laminating and pressing powder of corresponding materials, a prefabricated battery cell is obtained, and the powder of the electrolyte layer is obtained by solid electrolysis of sulfide; a pressure is applied to the outer sides of the positive electrode layer and the negative electrode layer of the prefabricated battery cell in the direction ofthe electrolytic layer, and high-temperature treatment is performing for 5-10 minutes to obtain a finished battery cell; and tabs are installed on the finished battery cell, coating for the finishedbattery cell is performed by utilizing an aluminum-plastic film, and a battery shell is installed to obtain the solid sulfide electrolyte lithium battery with low internal resistance, and battery heating and cycle performance reduction caused by the internal resistance of the solid sulfide electrolyte lithium battery are slowed down.

Description

technical field [0001] The invention relates to an all-solid-state lithium battery with a sulfide electrolyte, in particular to a low internal resistance solid-state sulfide electrolyte lithium battery and a preparation method thereof. Background technique [0002] As a chemical power source with high specific energy, lithium-ion battery is widely used in energy, transportation, communication, electric tools and other fields. Lithium-ion batteries have been commercialized since 1991 and have been used on a large scale. During this process, they have also been accompanied by continuous development—from electrolytes with lower safety to solid electrolytes with higher safety today. [0003] Currently commonly used solid electrolytes are divided into polymer solid electrolytes and inorganic solid electrolytes. However, the current application of solid electrolytes generally has the problem of interfacial impedance. The main reason for the problem of interface impedance is that...

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Problems solved by technology

[0008] However, a new problem has been brought about. Because of the material limitations of the positive and negative electrodes, the temperature required by the chemical vapor deposition method for the positive and negative electrodes is higher than the decomposition temperature of the sulfide solid electrolyte, so it is difficult for the positive and negative electrodes to be deposited by chemical vapor phase. Therefore, the chemical vapor deposition method can only weaken the interfacial impedance of the sulfide solid electrolyte to the positive electrode or the negative electrode.

Therefore, the chemical vapor deposition method to improve the sulfide solid-state electrolyte has limited actual effects. In addition, especially when used for large-scale lithium batteries, the vapor deposition area is large, the cost is high, the deposition uniformity fluctuates significantly, and the effect is unstable. making it difficult as a broadly applicable method

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