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Siloxane derivative electrolyte for lithium-ion battery and high-voltage lithium-ion battery

A technology of lithium-ion batteries and derivatives, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low charging and discharging efficiency of lithium-ion batteries, restricting the development of lithium-ion batteries, poor cycle performance, etc., and achieves remarkable effects , improve cycle performance and service life, and increase energy density

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrolyte of lithium-ion batteries is easy to decompose under high voltage, resulting in relatively low charge and discharge efficiency and poor cycle performance of lithium-ion batteries, which restricts the further development of high-voltage lithium-ion batteries

Method used

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  • Siloxane derivative electrolyte for lithium-ion battery and high-voltage lithium-ion battery
  • Siloxane derivative electrolyte for lithium-ion battery and high-voltage lithium-ion battery
  • Siloxane derivative electrolyte for lithium-ion battery and high-voltage lithium-ion battery

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Effect test

Embodiment 1

[0025] The siloxane derivative lithium-ion battery electrolyte contains a siloxane derivative containing a straight-chain alkyl group with 2 carbon atoms.

[0026] The preparation method of siloxane derivatives is: 1,1,3,3-tetramethyldisiloxane and H 2 C=CH 2 Mix evenly at a molar ratio (1:2), add solvent toluene at a volume ratio of 1:10, add 5 mg of platinum as a hydrosilylation reaction catalyst, reflux at 65°C for 6 hours, and remove the solvent by rotary evaporation at 80°C for the obtained mixed liquid. The desired additives are available. Its structural formula is:

[0027]

[0028] When the high-voltage additive is used in the lithium-ion battery electrolyte, the mass percentage in the electrolyte is 0.8%. The organic solvent in the electrolyte is a mixture of ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC), wherein the mass ratio of EC, DMC and EMC is 1:1:1. The electrolyte of the lithium-ion battery is 1M LiPF 6 , denoted as...

Embodiment 2

[0030] The siloxane derivative lithium-ion battery electrolyte contains a straight-chain alkyl siloxane derivative with 2 carbon atoms in which part of the hydrogen is replaced by fluorine.

[0031] The preparation method of siloxane derivatives is: take a certain amount of 1,1,3,3-tetramethyldisiloxane and F-HC=CH 2 Mix evenly at a molar ratio (1:2), add solvent toluene at a volume ratio of 1:10, add 5 mg of platinum as a hydrosilylation reaction catalyst, reflux at 40°C for 6h, and remove the solvent by rotary evaporation at 80°C , the required additives can be obtained. Its structural formula is:

[0032]

[0033] When the high-voltage additive is used in the lithium-ion battery electrolyte, the mass percentage in the electrolyte is 0.8%. The organic solvent in the electrolyte is a mixture of ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC), wherein the mass ratio of EC, DMC and EMC is 1:1:1. The electrolyte of the lithium-ion battery...

Embodiment 3

[0035] The siloxane derivative lithium-ion battery electrolyte contains a carbonate-based siloxane derivative with 2 carbon atoms.

[0036] The preparation method of siloxane derivatives is: take a certain amount of 1,1,3,3-tetramethyldisiloxane and HO-CO-O-C=CH 2 Mix evenly at a molar ratio (1:2), add solvent toluene at a volume ratio of 1:10, add 5 mg of platinum as a hydrosilylation reaction catalyst, reflux at 60°C for 6h, and remove the solvent by rotary evaporation at 80°C for the resulting mixed liquid. The desired additives are available. Its structural formula is:

[0037]

[0038] When the high-voltage additive is used in the lithium-ion battery electrolyte, the mass percentage in the electrolyte is 0.8%. The organic solvent in the electrolyte is a mixture of ethylene carbonate (EC), dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC), wherein the mass ratio of EC, DMC and EMC is 1:1:1. The electrolyte of the lithium-ion battery is 1M LiPF 6 , denoted as...

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Abstract

The invention discloses a siloxane derivative electrolyte for a lithium-ion battery and a high-voltage lithium-ion battery. The electrolyte comprises a siloxane derivative additive. The siloxane derivative additive has a relatively high oxidation potential and is matched with a high-voltage cathode material; the energy density of the lithium-ion battery added with the siloxane derivative additive is improved; and meanwhile, the siloxane derivative additive can form stable interfacial films on the surfaces of a positive electrode and a negative electrode of the lithium-ion battery, suppress the reaction activity of the electrode surfaces, reduce oxidative decomposition of the electrolyte and effectively suppress flatulence, so that the cycle performance of the lithium-ion battery under a normal voltage and a high voltage is improved; and the service lifetime of the lithium-ion battery under the normal voltage and the high voltage is prolonged.

Description

technical field [0001] The invention relates to a siloxane derivative lithium-ion battery electrolyte and a high-voltage lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] As a new type of green high-energy battery, lithium-ion batteries are widely used in mobile phones, cameras, notebooks, etc. Portable devices such as computers. With the application in electric vehicles, cordless power tools and military, higher requirements are put forward for the energy density of lithium-ion batteries, and the ternary material LiNixCoyMnzO 2 (x+y+z=1) and LiMPO 4 Li-ion deintercalation reactions can occur at higher voltages (greater than 4.5 V), thus bringing new hope for improving the energy density of Li-ion batteries. However, the electrolyte of lithium-ion batteries is easy to decompose under high voltage, resulting in relatively low charge and discharge efficiency and poor cycle performance of lithium-ion batteries, whic...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 张治安洪波杨幸李劼张凯赖延清
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