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Anode composition, method for preparing anode and lithium ion battery

A lithium-ion battery and composition technology, applied in negative electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as inability to improve cycle performance, and achieve the effect of easy implementation and non-toxic environment

Active Publication Date: 2019-02-05
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, cycle performance cannot be improved in this case

Method used

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  • Anode composition, method for preparing anode and lithium ion battery
  • Anode composition, method for preparing anode and lithium ion battery
  • Anode composition, method for preparing anode and lithium ion battery

Examples

Experimental program
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Effect test

preparation example Construction

[0071] Preparation method of negative electrode

[0072] There is no particular limitation on the preparation method of the negative electrode. In some embodiments, a method of preparing a negative electrode for a lithium-ion battery may include:

[0073] - preparation of a slurry by mixing all components of the negative electrode composition according to the invention with a solvent;

[0074] and

[0075] - applying said slurry on a current collector.

[0076] There is no particular limitation on the solvent used in the present invention, and known solvents in batteries can be used. In some embodiments, an inorganic solvent (such as water), an organic solvent (such as alcohol), or a combination thereof may be used as the solvent.

[0077] The entire method for preparing the negative electrode composition of the present invention is easy to implement, non-toxic and environmentally friendly.

[0078] Lithium Ion Battery

[0079] A lithium-ion battery according to the ...

Embodiment 1

[0238] [Preparation of negative electrode]

[0239] 600 mg of nano silicon particles were mixed with 200 mg of Super P (SP) and 200 mg of karaya gum (KG) in water to obtain a slurry. Here, the weight ratio of Si:SP:KG is 6:2:2. After stirring for 4 hours, the resulting slurry was coated on Cu foil and then dried in vacuum at 70 °C for 8 hours. Finally, the coated Cu foil was cut into several Φ12 mm anodes.

[0240] [Preparation of battery]

[0241] A coin cell (CR2016) was assembled in an argon-filled glove box (MB-10compact, MBraun) by using the negative electrode obtained as above. Li metal foil was used as a counter electrode. Use 1M LiPF in FEC / EC / DMC (1:5:5 volume ratio, mixture of fluoroethylene carbonate (FEC), ethylene carbonate (EC) and dimethyl carbonate (DMC)) 6 as an electrolyte. Use ET20-26 as the diaphragm.

Embodiment 2

[0243] The negative electrode and the battery were prepared in the same manner as described above for Example 1, except that 200 mg of oxidized starch (OS) was used instead of 200 mg of karat gum (KG).

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Abstract

Provided is an anode composition for lithium ion batteries, comprising a) a silicon-based active material; and b) a binder, wherein the binder is selected from the group consisting of oxystarch, locust bean gum, tara gum, karaya gum and any combination thereof. Also provided are a process for preparing an anode for lithium ion batteries and a lithium ion battery.

Description

technical field [0001] The invention relates to a negative electrode composition for a lithium ion battery, a method for preparing the negative electrode for a lithium ion battery, and a lithium ion battery. Background technique [0002] Lithium-ion batteries are now widely used in energy storage systems and electric vehicles. [0003] Silicon is a promising active material for lithium-ion battery electrodes due to its large theoretical capacity and moderate operating voltage. However, during the lithium intercalation / delithiation process, silicon undergoes severe expansion and contraction. The huge volume change impairs the electrochemical performance of Li-ion batteries. [0004] The demand for more attractive and reliable lithium-ion batteries continues to grow. [0005] On the other hand, in the effort to design high-power batteries, reducing the particle size of active materials to the nanoscale can help shorten the diffusion length of charge carriers and improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/134H01M4/1395H01M4/625H01M10/0525H01M10/0569H01M10/446H01M4/621H01M4/0445H01M4/0461Y02E60/10Y02P70/50H01M4/0404H01M4/386H01M2004/027H01M2300/0034
Inventor 杨军别依田张敬君窦玉倩
Owner ROBERT BOSCH GMBH
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