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 reduced mobility of lithium ions in the electrolyte, reduced activity of lithium ions, and increased viscosity of the electrolyte, so as to reduce the migration rate of lithium ions and inhibit further Effects of decomposition and increase in interfacial impedance

Active Publication Date: 2019-05-03
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,

Method used

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  • Silicon-containing high-energy-density lithium ion battery
  • Silicon-containing high-energy-density lithium ion battery
  • Silicon-containing high-energy-density lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

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

[0049] Preparation of the positive electrode sheet: The mass percentage of the mixed positive electrode active material, conductive agent, and binder is 97.5:1:1.5, and 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 for 30 minutes with 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. After drying and rolling, the pole pieces were punched into small pieces with a size of 52*75mm.

[0050] Preparation of negative electrode sheet: The mass percentage of negative electrode active material, conductive agent, thickener...

Example Embodiment

[0052] Example 1

[0053] Take 21.6g EMC and 11.0g FEC, and after mixing uniformly, dissolve 19.4g LiFSI in it, then add 48.0g TTE and stir well. 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 disassembling, take out the negative pole piece, clean it with DMC three times, and dry it in vacuum. 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.

Example Embodiment

[0055] Example 2

[0056] Take 17.4g EMC and 8.9g FEC, mix well and dissolve 15.6g LiFSI in it, then add 58.1g TTE and stir well. 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 lithium ion battery with high energy density. The lithium ion battery comprises a positive electrode, a silicon-containing negative electrode, a fluorine-containing electrolyte, a diaphragm, electrode lugs and a packaging material. The silicon-containing negative electrode takes a silicon-based material as a whole or a part of electrochemical active substances. The electrolyte contains lithium salt, a non-aqueous organic solvent capable of dissolving the lithium salt, an SEI film-forming additive and hydrofluoroether. The solubility of the lithiumsalt in the non-aqueous organic solvent capable of dissolving the lithium salt is higher than 2 mol/L. The solubility of the lithium salt in the hydrofluoroether is lower than 0.3 mol/L, wherein the non-aqueous organic solvent capable of dissolving the lithium salt is mutually dissolved with the hydrofluoroether, the non-aqueous organic solvent capable of dissolving the lithium salt and the liquidSEI film-forming additive are mutually dissolved, so the solid SEI film-forming additive can be dissolved. The silicon-containing lithium ion battery has the advantages of high energy density, long cycle life, good rate capability, high safety performance, difficulty in expansion and deformation and the like.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon-containing lithium ion battery with high energy density. 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, the demand for lithium-ion batteries with high energy density, long cycle life, safe use, and good rate characteristics has become increasingly urgent. [0003] At present, the negative electrode material of commercialized lithium-ion batteries is mainly graphite, but due to the low theoretical capacity (372mAh / g), the improvement of the energy density of lithium-ion batteries is limited. Silicon-based anode materials have the advantage of high capacity that other anode materials cannot match. In recent years, silicon-based anode materials have become a research and development hotspot, and have gradually moved from lab...

Claims

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Application Information

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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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