Lithium ion batteries

一种锂离子电池、锂化的技术，应用在电池电极、二次电池、电路等方向，能够解决锂固定化电阻升高等问题

Inactive Publication Date: 2018-05-11
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the surface of the silicon anode material reacts with the components of the electrolyte to continuously form a passivating protective layer (solid electrolyte interface; SEI), which leads to the immobilization of lithium and a continuous increase in the resistance on the anode side

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Sub-micron sized non-aggregated silicon particles in the form of fragments are produced by milling:

[0110] First, 500 g of pure silicon (particle size distribution: d10 = 8 μm, d50 = 15 μm and d90 = 25 μm; produced by grinding coarser particles with a fluidized bed jet mill) was uniformly suspended in 2 kg of ethanol (99% pure) by stirring for 20 minutes. )middle. The grinding space of a Netzsch LabStar LS1 laboratory stirred ball mill (with ZETA ceramic grinding system) was filled with 490 ml of yttria-stabilized zirconia grinding beads (average diameter: 0.3 mm) and closed. The suspension of silicon and ethanol was introduced into the cooled (15° C.) grinding vessel of the mill and pumped through the mill at a flux of 40 kg / h in circulation. Grinding was carried out for 55 minutes at a grinding speed of 3000 rpm. After the milling operation, ethanol was added to the suspension until its solids concentration was 21.8% by weight. The particle distribution was measu...

Embodiment 2

[0112] Production of anodes using the silicon particles of Example 1 and sodium carboxymethylcellulose as binder:

[0113] 11.0 g of the suspension of silicon in ethanol from Example 1 (solids concentration: 21.8 wt. %) into a solution of 12.52 g of 1.4% by weight sodium carboxymethylcellulose (Daicel, grade 1380) in water. After addition of 0.856 g of graphite (Imerys, KS6L C), the mixture was stirred for a further 30 minutes at a peripheral speed of 12 m / s. After degassing, the dispersion is applied to a copper foil (Schlenk Metallfolien, SE-Cu58) with a thickness of 0.030 mm by means of a film applicator (Erichsen, type 360) with a gap width of 0.20 mm. The prepared anode coating was then dried for 60 minutes at 80° C. and an air pressure of 1 bar. The average basis weight of the dry anodic coating is 2.90 mg / cm 2 .

Embodiment 3

[0114] Embodiment 3 (Ex.3):

[0115] Lithium ion battery with the anode of Example 2:

[0116] Electrochemical studies were performed in a coin cell (CR2032 type, Hohsen Corp.) employing a 2-electrode arrangement. The electrode coating from Example 2 was used as counter electrode or negative electrode (Dm = 15 mm) and would be based on 1:1:1 lithium nickel manganese cobalt oxide with a content of 94.0% and an average basis weight of 14.5 mg / cm 2Coatings (from Custom Cells) were used as working electrodes or positive electrodes (Dm = 15mm). Glass fiber filter paper (Whatman, GD Type D) impregnated with 120 μl of electrolyte was used as a separator (Dm = 16 mm). The electrolyte used consisted of a 1.0 molar solution of lithium hexafluorophosphate in a 3:7 (v / v) mixture of vinylene carbonate and diethyl carbonate to which 10.0% by weight of fluorodimethylsilylbutyronitrile and 2.0 % by weight tributylamine. In the glove box (2 O,O 2 ) to construct the battery; the water cont...

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Abstract

The invention relates, inter alia, to lithium ion batteries comprising a cathode, an anode containing silicon particles, a separator and an electrolyte, characterized in that the electrolyte containsone or more amines and in that the anode material is only partially lithiated in the fully charged lithium ion battery.

Description

technical field [0001] The present invention relates to lithium ion batteries having silicon-containing anode materials. Background technique [0002] Rechargeable lithium-ion batteries are currently the most practical electrochemical energy storage devices with a maximum gravimetric energy density of, for example, up to 250 Wh / kg. They are used in particular in the field of portable electronics, for tools and for electrically driven means of transport, such as motorcycles or automobiles. However, especially when used in automobiles, it is necessary to further significantly increase the energy density of batteries in order to achieve a higher electrical range of motor vehicles. [0003] In many cases, cyclic / aliphatic carbonates have been described as electrolyte stock solutions for Li-ion batteries, such as vinylene carbonate (VC) specified in US7476469. Gu-Yeon Kim and J.R.Dahn, Journal of The Electrochemical Society, 162(3) A437-A447 (2015) Recommended electrolyte addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/38H01M10/0525H01M10/0567H01M4/1395H01M10/0568H01M4/02
CPCH01M4/134H01M4/1395H01M4/386H01M10/0525H01M10/0567H01M10/0568H01M2004/027H01M2300/0017Y02E60/10H01M2300/0025
Inventor 斯特凡·豪费丹尼尔·布罗因林
Owner WACKER CHEM GMBH
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