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Electrolyte of negative-electrode-free secondary lithium battery, negative-electrode-free secondary lithium battery and formation process

A secondary lithium battery and electrolyte technology, applied in secondary batteries, battery electrodes, secondary battery repair/maintenance, etc., can solve the problems of poor high temperature performance, low room temperature conductivity, etc. The effect of high conductivity and broadening the electrochemical stability window

Pending Publication Date: 2021-02-26
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Boron salt is the main salt alone, although its low temperature performance is good, but the high temperature performance is poor, and the conductivity at room temperature is low, all boron salts as the main salt also have certain defects

Method used

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  • Electrolyte of negative-electrode-free secondary lithium battery, negative-electrode-free secondary lithium battery and formation process
  • Electrolyte of negative-electrode-free secondary lithium battery, negative-electrode-free secondary lithium battery and formation process
  • Electrolyte of negative-electrode-free secondary lithium battery, negative-electrode-free secondary lithium battery and formation process

Examples

Experimental program
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Effect test

Embodiment 1

[0040] a. The manufacturing steps of the battery are briefly described as follows: lithium nickel aluminum cobalt oxide (NCA) is mixed with conductive carbon black (Super P), carbon nanotube (CNT), and polyvinylidene fluoride in a weight ratio of 93:2:2:3 Finally, add N-methylpyrrolidone and stir evenly to prepare positive electrode slurry. According to one side 27mg / cm 2 Coated with a surface density of 100 degrees Celsius for 12 hours in vacuum, then rolled and cut to make positive electrode sheets; using 10 μm copper foil as the negative electrode current collector, ultrasonically cleaned the copper foil in 1% nitric acid aqueous solution for 3 minutes to remove the oxide layer and dust impurities. Clean the acid-treated copper foil with absolute ethanol, dry it after cleaning. Carbon nanotubes with a thickness of 1 μm were coated on both sides of the copper foil, dried at room temperature, and then cut to form negative electrodes. The positive and negative plates are se...

Embodiment 2

[0044] a. The manufacturing steps of the battery are briefly described as follows: lithium nickel aluminum cobalt oxide (NCA) is mixed with conductive carbon black (Super P), carbon nanotube (CNT), and polyvinylidene fluoride in a weight ratio of 93:2:2:3 Finally, add N-methylpyrrolidone and stir evenly to prepare positive electrode slurry. According to one side 27mg / cm 2 Coated with a surface density of 100 degrees Celsius for 12 hours in vacuum, then rolled and cut to make a positive electrode sheet; using 24 μm copper foil as the negative electrode current collector, the copper foil was ultrasonically cleaned in 1% nitric acid aqueous solution for 3 minutes to remove the oxide layer and dust impurities. Clean the acid-treated copper foil with absolute ethanol, dry it after cleaning. Coated acetylene black with a thickness of 1 μm on both sides of the copper foil, dried at room temperature, and then cut to make negative electrodes. The positive and negative plates are sep...

Embodiment 3

[0048] a. The production steps of the battery are briefly described as follows: After mixing lithium nickel aluminum cobalt oxide (NCA) with conductive carbon black (Super P) and polyvinylidene fluoride in a weight ratio of 95:2:3, add N-methylpyrrolidone, Stir evenly to make positive electrode slurry. According to one side 27mg / cm 2 Coated with a surface density of 100 degrees Celsius for 12 hours in vacuum, then rolled and cut to make positive electrode sheets; using 10 μm copper foil as the negative electrode current collector, ultrasonically cleaned the copper foil in 1% nitric acid aqueous solution for 3 minutes to remove the oxide layer and dust impurities. Clean the acid-treated copper foil with absolute ethanol, dry it after cleaning. Carbon nanotubes with a thickness of 1 μm were coated on both sides of the copper foil, dried at room temperature, and then cut to form negative electrodes. The positive and negative plates are separated by a polypropylene (PP) ceramic...

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Abstract

The invention belongs to the technical field of lithium batteries, and particularly relates to an electrolyte of a negative-electrode-free secondary lithium battery, the negative-electrode-free secondary lithium battery and a formation process. The liquid electrolyte takes lithium sulfimide and fluoro alkoxy lithium trifluoroborate as main lithium salts, takes a carbonate compound-organic fluorinecompound as an organic solvent system, and a functional additive is added into the system. The invention also discloses a formation process of the negative-electrode-free secondary lithium battery, namely, the negative-electrode-free secondary lithium battery is formed at a certain high temperature (40-100 DEG C), a certain pressure (0-3 MPa) and a certain vacuum degree (0--0.1 MPa). The negative-electrode-free secondary lithium battery provided by the invention has the advantages of high energy density, high safety, long cycle life and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to an electrolyte solution of a negative-electrode secondary lithium battery, a negative-electrode secondary lithium battery and a formation process. Background technique [0002] Lithium metal has a very high theoretical specific capacity (3840mAh g -1 ), and has the lowest reduction potential, so it is considered as an ideal anode material for rechargeable batteries. However, at present, the high-energy-density "Holy Grail" lithium metal secondary battery has short cycle life and poor safety performance. Its commercial development is restricted by the excessive use of metal lithium anode, which leads to large volume expansion, rapid pulverization, severe dendrite growth and electrolysis. There are many problems such as a large amount of liquid consumption. Therefore, reducing the excessive use of lithium metal anode is of great significance to improve the e...

Claims

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Application Information

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IPC IPC(8): H01M50/434H01M4/66H01M4/38H01M4/62H01M10/0568H01M10/0525H01M10/058H01M10/42
CPCH01M10/0568H01M4/667H01M4/661H01M4/663H01M4/628H01M4/382H01M10/0525H01M10/058H01M10/4235H01M2004/027Y02E60/10Y02P70/50
Inventor 崔光磊谢斌许高洁刘海胜陆迪
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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