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Lithium-ion battery non-aqueous electrolyte and lithium-ion battery

A non-aqueous electrolyte and lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low-temperature discharge performance, high-temperature performance, and low impedance, and achieve improved high-temperature cycle performance and good high-temperature performance, the effect of improving high-temperature storage performance

Active Publication Date: 2020-03-27
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion battery non-aqueous electrolyte with good high-temperature performance (including high-temperature cycle performance and high-temperature storage performance) and low impedance, aiming to solve the problem that the existing lithium-ion battery electrolyte is difficult to achieve good results. Low temperature discharge performance and high temperature performance

Method used

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  • Lithium-ion battery non-aqueous electrolyte and lithium-ion battery
  • Lithium-ion battery non-aqueous electrolyte and lithium-ion battery
  • Lithium-ion battery non-aqueous electrolyte and lithium-ion battery

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preparation example Construction

[0044] The preparation of fluorine-containing compound in compound B adopts corresponding carbonate and F 2 / N 2 After fluorination of the mixed gas, it can be purified by recrystallization or column chromatography. An example of its synthetic route is as follows:

[0045]

[0046] The cyano-containing compound in compound B is prepared by chlorinating the corresponding carbonate with sulfonyl chloride, then reacting with NaCN or KCN, and obtaining it through recrystallization or column chromatography purification. An example of its synthetic route is as follows:

[0047]

[0048] The trimethylsiloxy-containing compound in compound B is prepared by the substitution reaction between the corresponding hydroxycarbonate and nitrogen silane, and then purified by recrystallization or column chromatography. An example of its synthetic route is as follows:

[0049]

[0050] Further preferably, based on 100% of the total mass of the lithium-ion battery non-aqueous electrol...

Embodiment 1-16

[0066] Embodiment 1-16, comparative example 1-5

[0067] A 4.2V LiNi 0.5 co 0.2 mn 0.3 o 2 / artificial graphite battery, comprising a positive pole, a negative pole, a diaphragm arranged between the positive pole and the negative pole, and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, and the total amount of the non-aqueous electrolyte is The components and their contents in Examples 1-16 and Comparative Examples 1-5 are shown in Table 1 on a weight basis of 100%.

Embodiment 17-21， comparative example 6

[0069] A 4.4V LiCoO 2 / artificial graphite battery, comprising a positive pole, a negative pole, a diaphragm arranged between the positive pole and the negative pole, and an electrolyte, wherein the electrolyte is a non-aqueous electrolyte, and the total amount of the non-aqueous electrolyte is The weight is 100%, and the components and their contents in Examples 17-21 and Comparative Example 6 are shown in Table 2.

[0070] The LiNi of embodiment 1-16 of the present invention, comparative example 1-5 0.5 co0.2 mn 0.3 o 2 / artificial graphite battery, and the LiCoO of embodiment 17-21, comparative example 6 2 / Artificial graphite battery for performance testing, the test indicators and test methods are as follows:

[0071] (1) High-temperature cycle performance, which is reflected by testing the capacity retention rate after N cycles of 1C at 45°C. The specific method is: at 45°C, charge the formed battery to 4.2V with 1C constant current and constant voltage (Example 1- ...

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Abstract

A lithium-ion battery non-aqueous electrolyte for resolving the problem in which, with conventional lithium-ion battery non-aqueous electrolytes, it is difficult to obtain both good discharge performance at low temperatures and good performance at high temperatures. The lithium-ion battery non-aqueous electrolyte comprises compound A represented by structural formula I and compound B represented by structural formula B. In the structural formula I, R1 is a C1-C4 alkyl group, and m is 1 or 2. In the structural formula II, R2, R3, R4, R5, R6, and R7 are independently selected from at least one of a hydrogen atom, a halogen atom, or a C1-C5 group. The lithium-ion battery non-aqueous electrolyte provided by the invention uses the combination of compound A and compound B, and thereby achieves each of cycling performance, storage performance at high temperatures, and discharge performance at low temperatures for a lithium-ion battery containing the non-aqueous electrolyte.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a non-aqueous electrolyte solution of a lithium-ion battery and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are secondary batteries that rely on lithium ions to move between positive and negative electrodes to function. Lithium-ion batteries have significant advantages such as high working voltage, high energy density, low self-discharge rate, and no memory effect. Vehicles, electric vehicles, military equipment, aerospace and other fields. With the rapid development of new energy vehicles and energy storage fields, people have put forward higher requirements for the performance of lithium-ion power batteries. At present, lithium-ion power batteries have insufficient high-temperature cycle life, and cannot take into account high and low temperature performance. [0003] The non-aqueous electrolyte is a key factor affecting the bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0566H01M10/0568H01M10/0525
CPCH01M10/0525H01M10/0566H01M10/0568Y02E60/10
Inventor 石桥林木崇胡时光林雄贵
Owner SHENZHEN CAPCHEM TECH CO LTD
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