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Low-temperature lithium ion battery electrolyte, and lithium ion battery using electrolyte

A lithium-ion battery and electrolyte technology, which is applied in the direction of batteries, secondary batteries, organic electrolytes, etc., can solve problems such as difficulty in meeting the requirements of lithium-ion batteries, increased charge transfer impedance, and increased electrolyte viscosity, and achieves improved Effects of low-temperature voltage plateau phenomenon, improvement of discharge capacity and ratio, and improvement of electrical conductivity

Inactive Publication Date: 2018-07-10
无锡九宇宝新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the operating efficiency of the existing lithium-ion battery electrolyte is low at low temperature. Specifically, the viscosity of the electrolyte increases at low temperature, and even partially solidifies, resulting in low ion conductivity; at low temperature, the diffusion coefficient of lithium ions in the active material decreases. The charge transfer resistance (Rct) increases significantly; the compatibility between the electrolyte, the negative electrode and the separator becomes poor at low temperature, and it is difficult to meet the requirements of the existing technology for lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: Low-temperature lithium-ion battery electrolyte, including non-aqueous organic solvent, lithium salt, functional auxiliary agent 1 and functional auxiliary agent 2, described functional auxiliary agent 1 is fluoroethylene carbonate, and functional auxiliary agent 2 is propylene Base-1,3-propane sultone.

[0014] Further, the lithium salt is lithium difluorooxalate borate (LiODFB) and lithium dioxalate borate (LiBOB), the molar ratio of which is 30:70, and the mass percentage of the lithium salt in the electrolyte is 8-14 %, the mass percentage of the lithium salt described in this embodiment in the electrolyte is 11%.

[0015] Further, the non-aqueous organic solvent is a mixture of propylene carbonate, dimethyl sulfite and propylene sulfite, and the mass part ratio is 1:2:1.

[0016] Further, the mass percentage of the fluoroethylene carbonate in the electrolyte is 1%.

[0017] Further, the mass percentage of the propenyl-1,3-propane sultone in the elec...

Embodiment 2

[0023] Embodiment 2: low-temperature lithium-ion battery electrolyte, including non-aqueous organic solvent, lithium salt, functional auxiliary agent 1 and functional auxiliary agent 2, described functional auxiliary agent 1 is fluoroethylene carbonate, and functional auxiliary agent 2 is propylene Base-1,3-propane sultone.

[0024] Further, the lithium salt is lithium difluorooxalate borate (LiODFB) and lithium dioxalate borate (LiBOB), the molar ratio of which is 25:75, and the mass percentage of the lithium salt in the electrolyte is 8%.

[0025] Further, the non-aqueous organic solvent is a mixture of propylene carbonate, dimethyl sulfite and propylene sulfite, and the mass part ratio is 1:2:1.

[0026] Further, the mass percentage of the fluoroethylene carbonate in the electrolyte is 0.5%.

[0027] Further, the mass percentage of the propenyl-1,3-propane sultone in the electrolyte is 1%.

Embodiment 3

[0028] Embodiment 3: low-temperature lithium-ion battery electrolyte, including non-aqueous organic solvent, lithium salt, functional auxiliary agent 1 and functional auxiliary agent 2, described functional auxiliary agent 1 is fluoroethylene carbonate, and functional auxiliary agent 2 is propylene Base-1,3-propane sultone.

[0029] Further, the lithium salt is lithium difluorooxalate borate (LiODFB) and lithium dioxalate borate (LiBOB), the molar ratio of which is 40:60, and the mass percentage of the lithium salt in the electrolyte is 14%.

[0030] Further, the non-aqueous organic solvent is a mixture of propylene carbonate, dimethyl sulfite and propylene sulfite, and the mass part ratio is 1:2:1.

[0031] Further, the mass percentage of the fluoroethylene carbonate in the electrolyte is 1.5%.

[0032] Further, the mass percentage of the propenyl-1,3-propane sultone in the electrolyte is 3%.

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Abstract

The invention discloses a low-temperature lithium ion battery electrolyte. The electrolyte comprises a non-aqueous organic solvent, a lithium salt, a functional assistant 1 and a functional assistant2, the functional assistant 1 is fluoroethylene carbonate, and the functional assistant 2 is prop-1-ene-1,3-sultone. The invention also discloses a lithium ion battery. The lithium ion battery comprises a positive electrode sheet, a negative electrode sheet, a lithium battery diaphragm and the low-temperature lithium ion battery electrolyte. The invention relates to the low-temperature lithium ionbattery electrolyte having a good cycleability and a good rate under low-temperature conditions, and the lithium ion battery using the electrolyte.

Description

technical field [0001] The invention relates to the technical field of batteries and electrolytes, in particular to a low-temperature lithium-ion battery electrolyte and a lithium-ion battery using the electrolyte. Background technique [0002] Compared with traditional lead-acid batteries and nickel-cadmium batteries, lithium-ion batteries have the characteristics of high specific power, high specific energy, no memory effect, and long cycle life. . At present, lithium-ion batteries have occupied most of the energy market of portable electronic products such as mobile phones, digital cameras, notebook computers and camcorders, and have begun to enter the market of electric bicycles and cars, gradually attracting the attention of the field of electric vehicles. [0003] The electrolyte inside the lithium-ion battery has a great influence on the operating performance of the battery. Studies have shown that the discharge capacity of lithium-ion batteries at -20°C is only abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2220/20H01M2220/30H01M2300/0025Y02E60/10
Inventor 陈峰
Owner 无锡九宇宝新能源科技有限公司
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