Lithium-ion battery electrolyte and lithium-ion battery containing same

A technology of lithium ion battery and electrolyte, applied in the field of lithium ion battery electrolyte and lithium ion battery, can solve problems such as capacity attenuation of secondary battery, and achieve the effect of inhibiting gas production, inhibiting oxygen evolution reaction, and good lithium conduction performance

A technology of lithium ion battery and electrolyte, applied in the field of lithium ion battery electrolyte and lithium ion battery, can solve problems such as capacity attenuation of secondary battery, and achieve the effect of inhibiting gas production, inhibiting oxygen evolution reaction, and good lithium conduction performance

CN111029652AInactive Publication Date: 2020-04-17SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Lithium-ion battery electrolyte and lithium-ion battery containing same
  • Lithium-ion battery electrolyte and lithium-ion battery containing same
  • Lithium-ion battery electrolyte and lithium-ion battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Electrolyte preparation:

[0047] In a glove box filled with argon (oxygen content ≤ 1ppm, water content ≤ 1ppm), ethylene carbonate (EC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC) were mixed at a ratio of 1:1:1. The volume ratio is mixed evenly and stirred continuously to obtain a mixed solvent, and then lithium hexafluorophosphate (LiPF 6 ) is dissolved to obtain a solution containing lithium hexafluorophosphate. Afterwards, add LiDFP and compound 1 to the solution containing lithium hexafluorophosphate, stir to make it dissolve completely, obtain the electrolytic solution of embodiment 1, the mass percent of lithium hexafluorophosphate in the electrolytic solution is 12.5%, the mass percent of compound 1 in the electrolytic solution is 1%, the mass percentage of LiDFP in the electrolyte is 1%.

Embodiment 2～18

[0049] Examples 2-18 are also specific examples of electrolyte preparation. Except for the parameters in Table 1, other parameters and preparation methods are the same as in Example 1. The electrolyte formulation is shown in Table 1.

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Abstract

The invention discloses a lithium-ion battery electrolyte which comprises a lithium salt, an additive and a non-aqueous solvent, and the additive comprises the following components in percentage by mass in the lithium-ion battery electrolyte: 0.1-5% of an aryl sulfur-containing ester additive and 0.1-6% of a phosphorus-containing lithium salt additive. According to the lithium-ion battery electrolyte, the safety performance and the cycling stability of the battery are improved, and the cycling performance and the coulombic efficiency of the battery are improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion battery electrolyte and a lithium-ion battery containing the electrolyte. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect, and have been widely researched and applied. In order to increase the energy density, it can be achieved by increasing the working voltage of the battery and finding positive and negative electrode materials with high energy density, such as high-nickel ternary materials and silicon-carbon materials. In order to further increase the energy density, the high-nickel ternary cathode material (LiNi1-x-y-zCoxMnyAlzO2 (0≤x≤1, 0≤y≤1, 0≤z≤1, 0≤x+y+z≤1)) is combined with silicon Carbon negative electrode has become an inevitable choice. With the increase of nickel content in the ternary material, its gram capacity increases, but on the other hand, the increase of ni...

Claims

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Application Information

Patent Timeline
17 Apr 2020
Publication
CN111029652A
IPC
H01M10/0567; H01M10/0525
CPC
H01M10/0525; H01M10/0567; H01M2300/0025; Y02E60/10
Inventors
杨艳茹; 朱学全