Solid electrolyte in-situ interface layer modification method
A technology of solid electrolyte and modification method, which is applied in the field of all-solid-state batteries, can solve the problems of poor interface impedance and interface contact, and achieve the effects of low interface impedance, simple and easy operation, and excellent lithium affinity
Active Publication Date: 2021-08-03
HARBIN INST OF TECH
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Problems solved by technology
[0003] Aiming at the problem of extremely large interface impedance and poor interface contact between solid electrolyte and lithium metal anode, the present invention provides an in-situ interface layer modification method for solid electrolyte
Method used
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Embodiment 1
[0031] The punched lithium sheets were placed on the Li 6.5 La 3 Zr 1.8 Ta 0.2 o 12 On both sides of the solid electrolyte sheet, an all-solid lithium symmetrical battery is assembled.
Embodiment 2
[0033] The punched lithium sheets were placed on the Li 6.5 La 3 Zr 1.8 Ta 0.2 o 12 On both sides of the solid electrolyte sheet, an all-solid lithium symmetrical battery is assembled.
Embodiment 3
[0035] The punched lithium sheets were placed on the Li 6.5 La 3 Zr 1.8 Ta 0.2 o 12 On both sides of the solid electrolyte sheet, an all-solid lithium symmetrical battery is assembled.
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Abstract
The invention discloses a solid electrolyte in-situ interface layer modification method, which comprises the following steps: 1, preparing a garnet type solid electrolyte sheet by using a tabletting method, and placing the garnet type solid electrolyte sheet in the air; and 2, modifying the surface of the garnet type solid electrolyte sheet with titanium carbide, and sintering the garnet type solid electrolyte sheet at a high temperature to obtain the garnet type solid electrolyte sheet modified with titanium carbide. According to the method, a small amount of titanium carbide is used for converting substances such as Li2CO3 with extremely poor lithium affinity into Li(8-3.5 x)TixO4 with good lithium affinity in situ through a simple means, and the in-situ generation reaction can be generated in a reaction system in real time and acts on a substrate in real time without separation, so that the sufficiency and completeness of the reaction are ensured; an interface obtained after in-situ conversion has extremely excellent lithium affinity and shows low interface impedance, and long-time circulation of the battery is guaranteed.
Description
technical field [0001] The invention belongs to the technical field of all-solid-state batteries, and relates to a method for increasing the lithium compatibility of a solid-state electrolyte sheet by using titanium carbide as an interface modifying auxiliary agent. Background technique [0002] In view of the safety, energy density, and preparation costs of current liquid electrolyte systems, there is an urgent need to develop solid-state batteries with better performance and higher safety. The higher safety performance of solid-state batteries comes from its high shear modulus, which can inhibit the growth of lithium dendrites, and among the various solid-state electrolyte materials currently being studied, garnet-type solid-state electrolyte materials show better performance than other solid-state electrolyte materials. The material has more excellent properties. Experiments show that it has good compatibility with lithium metal and has a capacity close to 1mS cm at room ...
Claims
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IPC IPC(8): H01M10/0562H01M10/052H01M10/058
CPCH01M10/0562H01M10/052H01M10/058H01M2300/0071Y02P70/50Y02E60/10
Inventor 张乃庆彭洪刚范立双张宇
Owner HARBIN INST OF TECH
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