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An all-solid-state battery

An all-solid-state battery and solid-state electrolyte technology, applied in battery electrodes, secondary batteries, solid electrolytes, etc., can solve problems affecting battery performance, different lithium ion transmission paths, and easy lithium analysis, so as to suppress side reactions and improve circulation Performance and magnification performance, good matching effect

Active Publication Date: 2020-12-01
QINGTAO KUNSHAN ENERGY DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of an all-solid-state battery includes a positive electrode, a solid electrolyte, and a negative electrode. In actual use, there are still some problems, such as the negative electrode is easy to decompose lithium.
During the charging process of the battery, lithium ions will be deintercalated from the positive electrode and intercalated into the negative electrode, but in actual use, if the lithium ions deintercalated from the positive electrode cannot be intercalated into the negative electrode, then the lithium ions can only be precipitated on the surface of the negative electrode, thus forming a The layer of gray substance, the phenomenon of lithium precipitation seriously affects the performance of the battery
[0004] CN111009682A discloses a kind of all-solid-state lithium-ion battery, and it comprises the first solid-state electrolyte that thickness and roughness are all different, the second solid-state electrolyte, solved the problem of electrode cohesion and short circuit when solid-state electrolyte is designed simultaneously, but because solid-state electrolyte Different thicknesses lead to different transmission paths of lithium ions, which leads to the problem that the battery is easy to decompose lithium during actual use. The applicant's previous research has confirmed that setting a specific lithium affinity layer at the interface between the solid electrolyte and the electrode has a significant impact on battery performance. It is beneficial, but the selection of lithium affinity layer material needs a lot of experiments, thus, it is beneficial to provide a new type of anti-separation lithium all-solid-state battery

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Such as figure 1 As shown, this embodiment provides an all-solid-state battery 100 , and the all-solid-state battery 100 includes a negative electrode 1 , a positive electrode 2 and a solid electrolyte layer 3 between the positive electrode 2 and the negative electrode 1 . The negative electrode 1 includes a first negative electrode 1a and two second negative electrodes 1b, and the two second negative electrodes 1b are located on opposite sides of the first negative electrode 1a and respectively connected to the first negative electrode 1a. The positive pole 2 includes a first positive pole 2a and two second positive poles 2b, the two second positive poles 2b are located on opposite sides of the first positive pole 2a and respectively connected to the first positive poles 2a. The solid electrolyte layer 3 includes a first solid electrolyte layer 3a and two second solid electrolyte layers 3b, the two second solid electrolyte layers 3b are respectively located on opposite...

Embodiment 2

[0104] The battery of this embodiment has the same structure as the battery of Embodiment 1, and:

[0105]There are two second negative electrodes 1 b, both of which have a roughness of 8 μm and a thickness of 120 μm; the first negative electrode 1 a has a roughness of 10 μm and a thickness of 150 μm.

[0106] The current collectors of the first negative electrode 1a and the second negative electrode 1b are both copper foils, and the composition of the negative electrode active material layer on the current collectors is 60wt% carbon fiber and 40wt% polytetrafluoroethylene.

[0107] The first positive electrode 2a and the second positive electrode 2b use the same current collector, the current collector is aluminum foil, and the composition of the first positive electrode active material layer on the current collector is 90wt% LiCoO 2 , 3wt% conductive carbon black and 2wt% polytetrafluoroethylene, 5wt% lithium lanthanum zirconium oxide, the composition of the second positive ...

Embodiment 3

[0112] The battery of this embodiment has the same structure as the battery of Embodiment 1, and:

[0113] There are two second negative electrodes 1 b, both of which have a roughness of 8 μm and a thickness of 120 μm; the first negative electrode 1 a has a roughness of 10 μm and a thickness of 150 μm.

[0114] The current collectors of the first negative electrode 1a and the second negative electrode 1b are both copper foils, and the composition of the negative electrode active material layer on the current collectors is 60wt% carbon fiber and 40wt% polytetrafluoroethylene.

[0115] The first positive electrode 2a and the second positive electrode 2b use the same current collector, the current collector is aluminum foil, and the composition of the first positive electrode active material layer on the current collector is 90wt% LiCoO 2 , 3wt% conductive carbon black and 2wt% polytetrafluoroethylene, 5wt% lithium lanthanum zirconium oxide, the composition of the second positive...

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Abstract

The invention discloses an all-solid-state battery. The negative electrode of the all-solid-state battery includes a first negative electrode and a second negative electrode connected to each other, the positive electrode includes a first positive electrode and a second positive electrode connected to each other, and the solid electrolyte layer includes a first solid-state electrode connected to each other. An electrolyte layer and a second solid electrolyte layer, the first solid electrolyte layer is located between the first positive electrode and the first negative electrode, the second solid electrolyte layer is located between the second positive electrode and the second negative electrode, the thickness of the first solid electrolyte layer and the ion The electrical conductivity is lower than that of the second solid electrolyte layer, the first solid electrolyte layer is an oxide solid electrolyte, the second solid electrolyte layer contains a sulfide solid electrolyte, and the second positive electrode includes an active material layer and a coating layer. The conductivity of the first solid electrolyte layer and the second solid electrolyte layer realizes the matching of ion conductivity when the thickness of the first solid electrolyte layer and the second solid electrolyte layer are different, and overcomes the problem of lithium separation in all-solid-state batteries.

Description

technical field [0001] The invention relates to the field of new energy technologies, in particular to an all-solid-state battery. Background technique [0002] Traditional lithium-ion batteries use organic liquid electrolytes. Under abnormal conditions such as overcharging and internal short circuits, the batteries are prone to heat, causing the electrolyte to swell, decompose, spontaneously ignite or even explode, posing safety hazards. This is also one of the current ternary materials. short board. The all-solid lithium battery based on solid electrolyte uses solid electrolyte, does not contain flammable and volatile components, and completely eliminates safety hazards such as battery smoke and fire caused by battery leakage, and is known as the safest battery system. [0003] Therefore, all-solid-state batteries are considered to be the next generation of lithium batteries with industrial value. The structure of an all-solid-state battery includes a positive electrode,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M4/62H01M4/131H01M4/133H01M4/134H01M4/136H01M10/0562H01M10/0525
CPCH01M4/131H01M4/133H01M4/134H01M4/136H01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/62H01M4/628H01M10/0525H01M10/0562H01M2300/0068H01M2300/0071Y02E60/10
Inventor 冯玉川李峥王硕何泓材陈凯杨帆
Owner QINGTAO KUNSHAN ENERGY DEV CO LTD