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Additive for inhibiting expansion of silicon negative electrode and electrolyte containing additive

An additive, silicon anode technology, applied in the field of lithium-ion batteries, can solve the problems of easy pulverization, poor electrical conductivity and cycle performance, and achieve the effects of improving toughness, improving high-temperature storage performance, and inhibiting expansion

Active Publication Date: 2021-03-09
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The theoretical gram capacity of silicon anode can reach 4200mAh / g, which may become the next generation of anode material, but the material has poor conductivity and cycle performance, is easy to pulverize during charge and discharge, and is accompanied by a huge volume expansion effect

Method used

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  • Additive for inhibiting expansion of silicon negative electrode and electrolyte containing additive
  • Additive for inhibiting expansion of silicon negative electrode and electrolyte containing additive
  • Additive for inhibiting expansion of silicon negative electrode and electrolyte containing additive

Examples

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Embodiment 1

[0032] 1. Preparation of electrolyte: mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=29.16:29.16:29.16, after mixing Add 1M lithium hexafluorophosphate (LiPF 6 ), after the lithium salt was completely dissolved, 0.1 g of compound 1 was added.

[0033] 2. Preparation of positive electrode sheet

[0034] The nickel-cobalt lithium manganate ternary material LiNi 0.8 co 0.1 mn 0.1 o 2 , conductive agent SuperP, binder PVDF, and carbon nanotubes (CNT) are uniformly mixed at a mass ratio of 97.5:1.5:1:1 to make a certain viscosity lithium-ion battery positive electrode slurry, which is coated on the aluminum foil for current collector. The coating weight is 324g / m 2 , after drying at 85°C, cold pressing; then trimming, cutting, and stripping, and drying at 85°C for 4 hours under vacuum after stripping, welding the tabs, and making lithium-ion battery positive sheets that meet the requirements . ...

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Abstract

The invention discloses an additive for inhibiting expansion of a silicon negative electrode, an electrolyte containing the additive and a lithium ion battery. The additive for inhibiting expansion ofthe silicon negative electrode comprises a compound shown as a structural formula I. R1 and R2 are respectively and independently selected from C1-C12 straight-chain alkyl or C1-C12 halogen substituted straight-chain alkyl, R3 to R8 are independently selected from hydrogen groups or halogens, n is greater than or equal to 5, and m is greater than or equal to 0 and less than or equal to 5. The additive is subjected to polymerization reaction on the surface of a silicon negative electrode to form a stable protective film, so stability of a silicon negative electrode / electrolyte interface is improved, toughness of the silicon negative electrode surface protective film is improved, electrolyte circulating gas production and high-temperature storage gas production are inhibited, and expansionof a silicon negative electrode material is inhibited, and thereby the pulverization phenomenon of the silicon negative electrode material is ameliorated; the high-temperature storage performance, thenormal-temperature cycle performance and the high-temperature cycle performance of the battery are greatly improved, and the excellent performance of the lithium ion battery is ensured.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an additive for inhibiting the expansion of a silicon negative electrode, an electrolyte containing the additive, and a lithium ion battery. Background technique [0002] With the rapid increase in the types and quantities of digital products, new energy vehicles will show a heavy growth in the next few years. According to the "Development Plan for Energy Saving and New Energy Automobile Industry", power batteries require an energy density of 300Wh / Kg by 2020, and it is imperative to develop a battery system with high energy density. The energy density of the negative electrode material is particularly constrained to the battery system. The theoretical gram capacity of the commonly used graphite negative electrode is 372mAh / g, and the products developed in the industry are close to this theoretical value. The theoretical gram capacity of silicon anode can reach 420...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0567H01M10/4235H01M10/0525H01M2300/0025Y02E60/10
Inventor 欧霜辉戴晓兵王霹霹黄秋洁白晶毛冲
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS