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Electrolyte, preparation method of electrolyte, lithium ion battery, preparation method of lithium ion battery and electric equipment

A lithium-ion battery and electrolyte technology, which is applied in the field of secondary batteries, can solve problems such as the inability to support battery discharge, and achieve good conductivity, good film-forming performance, and good stability

Inactive Publication Date: 2019-12-27
李文颖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte can be discharged at -20°C or even -30°C, but it cannot support the discharge of the battery at an ultra-low temperature of -65°C

Method used

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  • Electrolyte, preparation method of electrolyte, lithium ion battery, preparation method of lithium ion battery and electric equipment
  • Electrolyte, preparation method of electrolyte, lithium ion battery, preparation method of lithium ion battery and electric equipment
  • Electrolyte, preparation method of electrolyte, lithium ion battery, preparation method of lithium ion battery and electric equipment

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preparation example Construction

[0088] According to another aspect of the present invention, there is provided a method for preparing the above electrolytic solution, comprising: uniformly mixing components to obtain the electrolytic solution. The preparation method of the electrolyte is simple and easy, and the prepared electrolyte still has good conductivity at low temperature, and the lithium-ion battery can still be charged and discharged normally at -40°C, and can still achieve large current discharge.

[0089] According to another aspect of the present invention, a lithium ion battery is provided, comprising the above-mentioned electrolyte solution, a positive electrode and a negative electrode. The lithium-ion battery includes the above-mentioned electrolyte, so it has the advantage of good low-temperature charge and discharge performance, can still be charged and discharged normally at -40°C, and can still achieve high-current discharge at an ultra-low temperature of -65°C.

[0090] In a preferred e...

Embodiment 1

[0107] An electrolytic solution, comprising the following components in weight percentage: 20% of lithium salt and 80% of solvent;

[0108] Lithium salts include the following components in weight percentage: LiBF 4 15% and LiFSI 85%;

[0109] The solvent includes the following components in weight percentage: sulfolane 25%, γ-butyrolactone 10%, ethyl acetate 48% and dimethyl carbonate 17%.

Embodiment 2

[0111] An electrolytic solution comprises the following components in weight percentage: 10% of lithium salt and 90% of solvent. All the other are identical with embodiment 1.

[0112] Different from Example 1, the weight percentage of lithium salt in this example is within the preferred range of the present invention.

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Abstract

The invention relates to the field of a secondary battery and particularly provides electrolyte, a preparation method of the electrolyte, a lithium ion battery, a preparation method of the lithium ionbattery and electric equipment. The electrolyte comprises lithium salt and solvent, wherein the lithium salt comprises mixture of LiBF4 and LiFSI, and the solvent comprises mixture of sulfolane, gamma-butyrolactone, ethyl acetate and dimethyl carbonate. The electrolyte is advantaged in that the charging capacity of the lithium ion battery at -40 DEG C can reach 65% or above of the nominal capacity, the lithium ion battery can still continuously discharge at the rate of 1C at the ultralow temperature of-65 DEG C, the discharge capacity is 60% or above of the normal temperature capacity, and continuous high-rate pulse discharge can be carried out at -43 DEG C.

Description

technical field [0001] The invention relates to the field of secondary batteries, in particular to an electrolyte and a preparation method thereof, a lithium ion battery and a preparation method thereof, and electrical equipment. Background technique [0002] Nowadays, lithium-ion batteries are widely used, and gradually applied to submarines, aerospace and electric vehicles from the batteries used in electrical appliances such as mobile phones and notebook computers. On the one hand, the lithium-ion battery electrolyte provides some active lithium ions, which are used as conductive ions during the charge and discharge process. On the other hand, the electrolyte provides ion channels, or carriers, through which lithium ions can move freely. Lithium-ion battery electrolyte is the carrier of ion transmission in the battery. It plays the role of conducting ions between the positive and negative electrodes of the lithium battery. It is like the "love bond" between the positive ...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0568H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2300/0028Y02E60/10
Inventor 李文颖
Owner 李文颖
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