Non-aqueous electrolyte of lithium ion battery and lithium ion battery

A lithium-ion battery, non-aqueous electrolyte technology, applied in battery electrodes, electrolytes, secondary batteries, etc., can solve the problems of large interface impedance, deteriorated low-temperature performance, poor conductivity, etc., achieve low impedance, improve low-temperature performance, improve The effect of high temperature performance

Inactive Publication Date: 2015-12-09
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, scientific and technical workers in this field have found in their research that the passivation film formed by the three-bond phosphate additive at the electrode interface has poor conductivity, resulting in a large interface impedance, which significantly deteriorates low-temperature performance and inhibits the formation of non-aqueous lithium ions. Application of batteries in low temperature conditions

Method used

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  • Non-aqueous electrolyte of lithium ion battery and lithium ion battery
  • Non-aqueous electrolyte of lithium ion battery and lithium ion battery
  • Non-aqueous electrolyte of lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Preparation of electrolyte

[0043] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=1:1:1, and then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1mol / L, then add 0.5% of compound 1 by the total mass of the electrolyte (compound 1, compound 2 referred to in the specific examples... refers to the corresponding numbered compounds listed above, Phosphate ester compounds shown in the following examples are the same), and 0.5% LIFSI by the total mass of the electrolyte.

[0044] 2) Preparation of positive plate

[0045] Mix the positive electrode active material lithium nickel cobalt manganese oxide LiNi according to the mass ratio of 93:4:3 0.5 co 0.2 mn 0.3 o 2 , conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then disperse them in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry. The slurry is uniformly coated on b...

Embodiment 2

[0063] Except that 0.5% of compound 1 was replaced by 0.5% of compound 2 in the preparation of the electrolyte, the others were the same as in Example 1. The data of high-temperature cycle performance, high-temperature storage performance and low-temperature performance obtained from the test are shown in Table 1.

Embodiment 3

[0065] Except that 0.5% of compound 1 was replaced by 0.5% of compound 4 in the preparation of the electrolyte, the others were the same as in Example 1. The data of high-temperature cycle performance, high-temperature storage performance and low-temperature performance obtained from the test are shown in Table 1.

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Abstract

The invention discloses a non-aqueous electrolyte of a lithium ion battery and the lithium ion battery. The electrolyte comprises a non-aqueous organic solvent, a lithium salt and an additive, wherein the additive comprises a substance containing the following compounds (A) and (B): (A) is shown in the specification, R1, R2 and R3 are respectively and independently selected from alkyl with carbon atom numbers of 1 to 4, at least one of the R1, the R2 and the R3 is unsaturated alkyl containing triple bonds; and (B), imidodisulfuryl fluoride lithium salt. With the adoption of the non-aqueous electrolyte of the lithium ion battery, disclosed by the invention, the lithium ion battery is endowed with low impedance and favorable low-temperature performance and high-temperature performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolyte, in particular to a lithium-ion battery non-aqueous electrolyte and a lithium-ion battery. Background technique [0002] At present, non-aqueous electrolyte lithium-ion batteries have been increasingly used in the 3C consumer electronics market, and with the development of new energy vehicles, non-aqueous electrolyte lithium-ion batteries are also increasingly used as power supply systems for vehicles. universal. Although these non-aqueous electrolyte batteries have been put into practical use, they are still unsatisfactory in terms of durability, especially at a high temperature of 45°C with a short service life. Especially for power vehicles and energy storage systems, non-aqueous electrolyte lithium-ion batteries are required to work normally in cold regions, and high and low temperature performance must be taken into account. [0003] In non-aqueous electrolyte lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M4/505H01M4/525H01M10/0568H01M2300/0037Y02E60/10H01M4/48H01M10/0569H01M10/46H01M2004/028
Inventor 石桥林木崇谌谷春胡时光
Owner SHENZHEN CAPCHEM TECH CO LTD
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