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Low-temperature-resistant lithium ion battery interface SEI membrane treatment method

A lithium-ion battery, low-temperature-resistant technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems such as detachment, cracks in the artificial SEI layer, and insufficient mechanical strength to resist volume changes in lithium metal. Achieve the effect of overcoming volume expansion and suppressing lithium dendrites

Inactive Publication Date: 2021-03-26
EAST INNER MONGOLIA ELECTRIC POWER COMPANY +3
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Problems solved by technology

However, the mechanical strength of these artificial SEI layers is insufficient to resist the continuous and severe volume change of metallic Li during long cycling, thus leading to cracks and detachment of the artificial SEI layers, which degrade the electrochemical performance of the battery.

Method used

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  • Low-temperature-resistant lithium ion battery interface SEI membrane treatment method
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Embodiment Construction

[0013] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0014] Such as figure 1 Shown low temperature resistant lithium-ion battery interface SEI film processing method, it comprises the steps:

[0015] Step 1: Ga and Sn are physically mixed, heated, stirred and melted under an inert gas atmosphere, and then cooled to room temperature to obtain a liquid metal alloy of Ga and Sn. By combining the liquid metal alloy of Ga and Sn with 1-dodecylmercaptan Phacoemulsification to disperse Ga and Sn liquid metal alloys into Ga and Sn alloy nanoparticles (200nm);

[0016] Step 2: Ga and Sn alloy nanoparticles were uniformly mixed with conductive agent in N-methylpyrrolidone (NMP), and then the conductive agent-loaded Ga and Sn alloy nanoparticles were uniformly coated on Li metal together with a binder. On the surface, then dry the binder (THF tetrahydrofuran) in a glove box to obtain a liquid metal solid e...

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Abstract

The invention discloses a low-temperature-resistant lithium ion battery interface SEI membrane treatment method which comprises the following steps: 1, physically mixing Ga and Sn, heating, stirring and melting in an inert gas atmosphere, cooling to room temperature to obtain a liquid metal alloy of Ga and Sn, and ultrasonically emulsifying the liquid metal alloy of Ga and Sn with 1-dodecyl mercaptan to disperse the liquid metal alloy of Ga and Sn into Ga and Sn alloy nanoparticles; and 2, uniformly mixing the Ga and Sn alloy nanoparticles with a conductive agent in N-methyl pyrrolidone, uniformly coating the conductive agent-loaded Ga and Sn alloy nanoparticles and an adhesive on the surface of lithium metal, and drying the adhesive to obtain the liquid metal solid electrolyte interface layer of the Ga and Sn alloy. According to the invention, the problems of lithium dendrites and cycling stability generated in the charging and discharging process of the low-temperature-resistant lithium metal battery negative electrode material can be solved.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a method for treating a low-temperature-resistant lithium-ion battery interface SEI (Solid Electrolyte Interface, solid electrolyte interface) film. Background technique [0002] Lithium-ion batteries play an important role in our daily life as advanced energy storage devices, however, the capacity of current commercial Li-ion batteries is still far from satisfactory. Compared with conventional graphite anodes, metallic lithium has a large theoretical specific capacity (3860mAhg-1) and the lowest electrochemical potential (-3.04V vs. standard hydrogen electrode). Therefore, the use of lithium metal as the negative electrode material of lithium-ion batteries can effectively increase the energy density of the battery, and it is very promising to be used in the next generation of lithium-ion batteries, especially for high altitude areas, where the intrinsic impedance of graphi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/62H01M10/0525H01M10/42
CPCH01M4/13H01M4/139H01M4/628H01M10/0525H01M10/4235Y02E60/10
Inventor 王远东苏林华高春辉曹阳邓鹤鸣陈明国党伟苏瑞蔡伟刘健张辉
Owner EAST INNER MONGOLIA ELECTRIC POWER COMPANY
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