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

A technology of sulfide electrolyte and solid electrolyte, which is applied in battery electrodes, secondary battery manufacturing, electrode manufacturing, etc. It can solve the problems of unstable effect, weakened interface impedance, and limited effect, so as to reduce the internal resistance of the battery and slow down the internal resistance of the battery. The effect of resistance

Active Publication Date: 2020-06-19
ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0080] A low internal resistance solid sulfide electrolyte lithium battery, comprising a positive electrode layer, an electrolyte layer and a negative electrode layer laminated in sequence.

[0081] The positive electrode layer is formed by pressing the positive electrode pressed powder. The positive electrode pressed powder includes uniformly mixed positive electrode material powder and sulfide solid electrolyte powder, and its particle size is 5-15 μm. The positive electrode material powder is one of lithium cobalt oxide material, nickel-cobalt-manganese ternary material, and nickel-cobalt-aluminum ternary material. The mixing mass ratio of positive electrode material powder and sulfide solid electrolyte powder is 7:3.

[0082] The electrolyte layer is formed by pressing electrolyte pressing powder, which is solid electrolytic powder of sulfide.

[0083] The negative electrode layer is formed by pressing the negative electrode pressed powder. The negative electrode pressed ...

Embodiment 4～6

[0097] A low internal resistance solid sulfide electrolyte lithium battery, based on the basis of Examples 1 to 3, the difference is that the preparation method of the solid sulfide electrolyte lithium battery is as follows:

[0098] A. Put the positive electrode pressed powder uniformly mixed with the positive electrode material powder and the sulfide solid electrolyte powder into the mold for internal cooling and isostatic pressing to form the positive electrode layer. The thickness of the positive electrode layer is 60 μm, and the pressing density is 3.0 g cm -3 ;

[0099] B. Evenly spread a layer of electrolyte pressed powder on the upper surface of the positive electrode layer, and cold isostatic pressing to obtain an integrated positive electrode layer and electrolyte layer. The thickness of the electrolyte layer is 30 μm, and the compacted density is 2.0 g cm -3 ;

[0100] C. Lay a layer of negative electrode pressing powder uniformly mixed with negative electrode mate...

Embodiment 7

[0122] A kind of low internal resistance solid-state sulfide electrolyte lithium battery, it is based on the basis of embodiment 1, and its difference is that its sulfide solid-state electrolyte is Li 2 S-P 2 S 5 .

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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...

Claims

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Application Information

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IPC IPC(8): H01M10/0585H01M4/04H01M4/139H01M10/04H01M10/0525H01M10/0562
CPCH01M10/0562H01M10/0525H01M10/0481H01M10/0585H01M4/0435H01M4/139Y02E60/10Y02P70/50
Inventor 许晓雄黄晓张秩华吴林斌
Owner ZHEJIANG FUNLITHIUM NEW ENERGY TECH CO LTD
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