Interface pretreatment liquid for silicon-oxygen pre-lithiation negative electrode as well as preparation method and application of interface pretreatment liquid

A pretreatment liquid and pretreatment technology, applied in the direction of battery electrodes, electrochemical generators, final product manufacturing, etc., can solve the limitations of not being able to improve the SEI stability of the pre-lithiated negative electrode, the first charge and discharge efficiency and cycle life , limit large-scale application and other issues, achieve the effect of improving the first charge and discharge efficiency and long-term cycle performance, inhibiting the growth of lithium dendrites and side reactions, and good electrochemical stability

Inactive Publication Date: 2021-07-30
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cooling treatment will increase energy consumption. In order to achieve obvious effects, a low temperature of -50°C is required, which limits its large-scale application.
[0009] To sum up, the methods currently used have certain problems in terms of operability, popularization, and practical effects, and cannot improve the SEI stability of the pre-lithiated negative electrode very well. Limitations in efficiency and cycle life

Method used

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  • Interface pretreatment liquid for silicon-oxygen pre-lithiation negative electrode as well as preparation method and application of interface pretreatment liquid
  • Interface pretreatment liquid for silicon-oxygen pre-lithiation negative electrode as well as preparation method and application of interface pretreatment liquid
  • Interface pretreatment liquid for silicon-oxygen pre-lithiation negative electrode as well as preparation method and application of interface pretreatment liquid

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Experimental program
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preparation example Construction

[0053] The present invention also provides a method for preparing the interface pretreatment liquid for the silicon-oxygen pre-lithiation negative electrode as described above, comprising the following steps:

[0054] In an inert gas atmosphere, control the water content < 1ppm, and the oxygen content < 1ppm, and mix the solute and the solvent.

[0055] The inert gas described in the present invention comprises helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radioactive radon (Rn), at normal temperature and pressure, they are all Colorless and odorless monatomic gas, it is difficult to carry out chemical reactions.

[0056] The present invention also provides an interface pretreatment method for a silicon-oxygen pre-lithiated negative electrode, comprising the following steps:

[0057] Soak the pre-lithiated pole piece in the interface pretreatment solution for silicon-oxygen pre-lithiated negative electrode as described in any of the above embodiments.

[0...

Embodiment 1

[0072] This embodiment provides an interface pretreatment solution for silicon-oxygen pre-lithiation negative electrode, its preparation method and application.

[0073] (1) In terms of mass percentage, the composition of the interface pretreatment liquid for the silicon-oxygen pre-lithiation negative electrode in this embodiment is:

[0074] Lithium polysulfide 1% and ethylene glycol dimethyl ether 99%; lithium polysulfide is prepared from sulfur and lithium sulfide in a molar ratio of 7:1.

[0075] (2) The preparation method of the interface pretreatment liquid for silicon oxygen prelithiation negative electrode in this embodiment is:

[0076] In an argon atmosphere glove box with a water content of <1ppm and an oxygen content of <1ppm, add ethylene glycol dimethyl ether into an aluminum-plastic bottle, and then add sulfur and lithium sulfide to the aluminum at a molar ratio of 7:1. In a plastic bottle, stir for 1 hour until the sulfur and lithium sulfide are completely dis...

Embodiment 2

[0091] This embodiment provides an interface pretreatment solution for silicon-oxygen pre-lithiation negative electrode, its preparation method and application.

[0092] (1) In terms of mass percentage, the composition of the interface pretreatment liquid for the silicon-oxygen pre-lithiation negative electrode in this embodiment is:

[0093] Lithium polysulfide 2% and ethylene glycol dimethyl ether 98%; lithium polysulfide is prepared from sulfur and lithium sulfide in a molar ratio of 7:1.

[0094] (2) The preparation method of the interface pretreatment liquid for silicon oxygen prelithiation negative electrode in this embodiment is:

[0095] In an argon atmosphere glove box with a water content of <1ppm and an oxygen content of <1ppm, add ethylene glycol dimethyl ether into an aluminum-plastic bottle, and then add sulfur and lithium sulfide to the aluminum at a molar ratio of 7:1. In a plastic bottle, stir for 1 hour until the sulfur and lithium sulfide are completely dis...

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Abstract

The invention relates to an interface pretreatment liquid for a silicon-oxygen pre-lithiation negative electrode as well as a preparation method and application of the interface pretreatment liquid. The interface pretreatment liquid comprises 0.1%-10% of solute and 90%-99.9% of solvent, the solvent is one or more selected from N-methyl pyrrolidone, ethylene carbonate, fluoroethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, gamma-butyrolactone, methyl formate, ethyl formate, methyl acetate, ethyl acetate, ethyl propionate, propyl propionate, ethyl butyrate, propyl butyrate, dimethyl sulfoxide, ethylene glycol dimethyl ether, 1, 3-dioxolane, dipolyethylene glycol dimethyl ether and dimethyl thionyl ether; and the solute is selected from one or more of lithium polysulfide, aluminum iodide, aluminum bromide, lithium nitrate and copper nitride. The solvent can fully infiltrate the internal pores of the lithium-rich negative plate and the surface of the negative active material, and the solute can react with the negative material, so that the stability of the SEI membrane is improved, and the first charge-discharge efficiency and long-term cycle performance of the battery are synergistically improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to an interface pretreatment liquid for silicon-oxygen pre-lithiation negative electrodes, a preparation method and application thereof. Background technique [0002] In recent years, in order to meet the rapid development needs of new energy vehicles, smart grids, and distributed energy storage, the development of lithium-ion batteries with high energy density, high safety, and long cycle life has become a research hotspot in the field of energy storage. The improvement of battery energy density mainly depends on the development of key electrode materials, such as the continuous improvement of the capacity of positive and negative electrode materials. The existing lithium-ion battery anode is approaching its limit. In order to meet the energy demand of the new generation and improve the energy density of the battery, it is imminent to develop a new lithium-ion anode technology....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M10/0525H01M10/058
CPCH01M4/1391H01M10/0525H01M10/058Y02P70/50Y02E60/10
Inventor 赵俊年梁世硕邱昭政赵育松李文龙张永庆梁亚鸣
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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