Electrolyte suitable for silicon-carbon negative electrode material

A technology of negative electrode material and electrolyte, applied in the electrolyte field of silicon carbon negative electrode material, can solve the problems of unsatisfactory battery cycle performance and rate performance, poor volume expansion conductivity, etc., achieve SEI film optimization, increase conductivity, increase rate performance effect

Inactive Publication Date: 2021-02-05
郑州中科新兴产业技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still many problems with silicon carbon materials. For example, silicon carbon materials have problems such as obvious volume expansion and poor conductivity during charging and discharging, which make the cycle performance and rate performance of batteries unable to meet the needs of today's market.

Method used

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  • Electrolyte suitable for silicon-carbon negative electrode material
  • Electrolyte suitable for silicon-carbon negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An electrolyte suitable for silicon-carbon anode materials of lithium-ion batteries, comprising the following raw materials: ethylene carbonate 30 g, diethyl carbonate 30 g, dimethyl carbonate 30 g, 15 crown ether-5 0.6 g, perfluoro 0.6 g of n-butylsulfonyl, 4.8 g of fluoroethylene carbonate, and 12 g of lithium hexafluorophosphate. According to the above quality, these raw materials were prepared and stirred in a glove box, and the conductivity of the electrolyte was measured to be 10.6 mS / cm by a conductivity meter.

[0020] Inject the prepared electrolyte into LiNi 0.8 co 0.1 mn 0.1 o 2 In the / SiC soft-pack battery, the design capacity of the soft-pack battery is 4.5 Ah. After the liquid injection is completed, packaging, shelving, formation, aging, secondary packaging, and capacity separation are performed to obtain a lithium-ion battery with a silicon-carbon negative electrode.

Embodiment 2

[0022] An electrolyte suitable for silicon-carbon anode materials of lithium-ion batteries, comprising the following raw materials: ethylene carbonate 30 g, diethyl carbonate 30 g, dimethyl carbonate 30 g, 15 crown ether-5 0.6 g, perfluoro 1.2 g of n-butylsulfonyl, 4.8 g of fluoroethylene carbonate, and 12 g of lithium hexafluorophosphate. According to the above quality, these raw materials were prepared and stirred in the glove box, and the conductivity of the electrolyte was measured by a conductivity meter to be 10.4 mS / cm.

[0023] Inject the prepared electrolyte into LiNi 0.8 co 0.1 mn 0.1 o 2 In the / SiC soft-pack battery, the design capacity of the soft-pack battery is 4.5 Ah. After the liquid injection is completed, packaging, shelving, formation, aging, secondary packaging, and capacity separation are performed to obtain a lithium-ion battery with a silicon-carbon negative electrode.

Embodiment 3

[0025] An electrolyte solution suitable for silicon-carbon negative electrode materials for lithium-ion batteries, comprising the following raw materials: 30 g of ethylene carbonate, 30 g of diethyl carbonate, 30 g of dimethyl carbonate, 0.6 g of 15 crown ether-5, and 0.6 g of perfluorinated 2.4 g of n-butylsulfonyl, 4.8 g of fluoroethylene carbonate, and 12 g of lithium hexafluorophosphate. According to the above quality, these raw materials were prepared and stirred in a glove box, and the conductivity of the electrolyte was measured by a conductivity meter to be 10.2 mS / cm.

[0026] Inject the prepared electrolyte into LiNi 0.8 co 0.1 mn 0.1 o 2 In the / SiC soft-pack battery, the design capacity of the soft-pack battery is 4.5 Ah. After the liquid injection is completed, packaging, shelving, formation, aging, secondary packaging, and capacity separation are performed to obtain a lithium-ion battery with a silicon-carbon negative electrode.

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Abstract

The invention provides an electrolyte suitable for a silicon-carbon negative electrode material,. The electrolyte comprises a lithium salt, a solvent and additives, the additives comprise a conductiveadditive, a film-forming additive and a functional additive, the conductive additive is 15-crown ether-5, the film-forming additive is fluoroethylene carbonate, and the functional additive is perfluoro n-butyl sulfonyl. The adopted 15-crown ether-5 has a preferential solvation effect on Li<+>, fluoroethylene carbonate is a cyclic fluorinated additive, has double properties and is deposited on thesurface of a silicon-carbon negative electrode to form a stable SEI film inner layer, and the perfluoro n-butyl sulfonyl is of a perfluorochain structure and is correspondingly located on the outer layer of the SEI film. The inner layer and the outer layer are reasonably matched, so that the SEI film has a double-layer structure and is more stable, the problem of volume expansion of the silicon carbon material in the repeated charging process is solved to a great extent, and the rate capability and cycle performance of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte suitable for silicon-carbon negative electrode materials. Background technique [0002] Compared with other batteries, lithium-ion batteries are widely used due to their advantages such as high specific capacity, high working voltage, wide working temperature range and stable discharge voltage. Today, lithium-ion batteries have been used in electronic watches, pacemakers, calculators and military equipment. Silicon carbon material combines the characteristics of high capacity of silicon and stable structure of graphite, and is considered to be the most likely next-generation anode material to replace graphite. At present, there are still many problems with silicon carbon materials. For example, silicon carbon materials have problems such as obvious volume expansion and poor conductivity during charging and discharging, which make the cycle performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/04H01M4/134H01M4/02
CPCH01M4/0407H01M4/134H01M10/0567H01M2004/027Y02E60/10
Inventor 刘艳侠刘景博王恩阳秦盼盼张锁江赵冲冲
Owner 郑州中科新兴产业技术研究院
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