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A silicon-containing high-energy-density lithium-ion battery

A high-energy density, lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of reducing the mobility of lithium ions in the electrolyte, increasing the viscosity of the electrolyte, reducing the activity of lithium ions, etc. Increases and suppresses the effect of further decomposition

Active Publication Date: 2022-02-22
BERZELIUS (NANJING) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the proportion of lithium salt in the electrolyte is too high, the viscosity of the electrolyte will be significantly increased, the activity of lithium ions will be reduced, and the mobility of lithium ions in the electrolyte will be significantly reduced. Wet, the result is that the actual capacity of the battery is low and the rate characteristics are poor.

Method used

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  • A silicon-containing high-energy-density lithium-ion battery
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  • A silicon-containing high-energy-density lithium-ion battery

Examples

Experimental program
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Effect test

preparation example Construction

[0048] The preparation of pure silicon anode lithium-ion battery mainly includes the following steps:

[0049] Preparation of positive electrode sheet: the mass percentage of mixed positive electrode active material, conductive agent and binder is 97.5:1:1.5, of which the positive electrode active material is LiCoO 2 , the specific preparation process is as follows: Weigh LiCoO in proportion 2 The positive electrode material, conductive carbon black and polyvinylidene fluoride (PVDF) binder powder are pre-mixed in a material tank for 30 minutes using a double planetary mixer, and then N-methylpyrrolidone (NMP) is added as a solvent and stirred at high speed After 60 minutes, a viscous positive electrode slurry was obtained, which was evenly coated on the aluminum foil, dried and rolled, and then the pole piece was punched into small pieces with a size of 52*75mm.

[0050] Preparation of negative electrode sheet: the mass percentage of negative electrode active material, condu...

Embodiment 1

[0053] Take 21.6g of EMC and 11.0g of FEC, mix them uniformly and dissolve 19.4g of LiFSI in them, then add 48.0g of TTE and stir them uniformly. After the obtained electrolyte is injected into the above-mentioned pure silicon negative electrode lithium ion battery, subsequent battery preparation and testing processes are performed.

[0054] Take a battery and discharge it to 2.75V after the 50-week cycle. After dismantling, take out the negative pole piece, wash it three times with DMC, and then vacuum dry it. Observe the SEI film on the surface of the pole piece under an electron microscope. figure 1 As shown in the figure, it can be observed that the SEI film formed on the surface of the negative electrode is thin and very dense.

Embodiment 2

[0056] Take 17.4g of EMC and 8.9g of FEC, mix them evenly and dissolve 15.6g of LiFSI in them, then add 58.1g of TTE and stir them evenly. After the obtained electrolyte is injected into the above-mentioned pure silicon negative electrode lithium ion battery, subsequent battery preparation and testing processes are performed.

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Abstract

The invention relates to a silicon-containing high-energy-density lithium-ion battery, including a positive electrode, a silicon-containing negative electrode, a fluorine-containing electrolyte, a separator, tabs and packaging materials; the silicon-containing negative electrode uses silicon-based materials as all or part of the battery. Chemically active substances; the electrolyte contains lithium salts, non-aqueous organic solvents that can dissolve lithium salts, SEI film-forming additives, and hydrofluoroether; the solubility of lithium salts in the non-aqueous organic solvents that can dissolve lithium salts is high 2mol / L; the solubility of lithium salt in the hydrofluoroether is lower than 0.3mol / L; the non-aqueous organic solvent soluble in lithium salt is miscible with hydrofluoroether; the solubility of lithium salt in The non-aqueous organic solvent is miscible with the liquid SEI film-forming additive, and can dissolve the solid SEI film-forming additive. The silicon-containing lithium-ion battery has the advantages of high energy density, long cycle life, good rate characteristics, high safety performance, and is not easy to expand and deform.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high energy density lithium ion battery containing silicon. Background technique [0002] Due to the rapid development and wide application of various portable electronic devices, new energy electric vehicles and energy storage systems in recent years, there is an increasingly urgent need for lithium-ion batteries with high energy density, long cycle life, safe use, and good rate characteristics. [0003] At present, the anode material of commercial lithium-ion batteries is mainly graphite, but due to the low theoretical capacity (372mAh / g), the improvement of energy density of lithium-ion batteries is limited. Silicon-based anode materials have the advantage of high capacity that other anode materials cannot match. There are three main types of silicon-based anode materials, one is a composite material composed of elemental silicon or the same carbon; the other is a compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/42H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 李喆剡剀叶兰张和宝王岑
Owner BERZELIUS (NANJING) CO LTD
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