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Electrolyte for lithium ion battery and lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in secondary batteries, electrolyte battery manufacturing, non-aqueous electrolyte batteries, etc., can solve problems such as decomposition, and achieve the effect of good high temperature stability and good battery cycle performance.

Pending Publication Date: 2021-12-24
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to further increase the oxidative decomposition potential of the electrolyte, solve the current problem of electrolyte decomposition under high voltage, and improve the high voltage and high temperature stability of the lithium battery, the present disclosure provides an electrolyte for a lithium ion battery and a lithium ion battery

Method used

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  • Electrolyte for lithium ion battery and lithium ion battery
  • Electrolyte for lithium ion battery and lithium ion battery
  • Electrolyte for lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of non-aqueous electrolyte:

[0039] In an argon glove box, 26 parts by weight of ethylene carbonate (EC), 61 parts by weight of diethyl carbonate (DEC), 12 parts by weight of lithium hexafluorophosphate (LiPF 6 ), 0.5 parts by weight of 2,3 pyridinedicarboxylic acid anhydride are mixed uniformly to obtain the lithium-ion battery electrolyte of the present embodiment, which is denoted as C1;

[0040] (2) Preparation of lithium ion battery:

[0041] The positive active material (LiNi 0.5 mn 1.5 o 4 ), acetylene black, and polyvinylidene fluoride are uniformly mixed according to the ratio of 90:5:5, and then pressed on the aluminum foil to obtain the positive electrode sheet; the metal lithium sheet is used as the negative electrode sheet; the PE / PP composite diaphragm is used as the ion exchange membrane. The electrolyte C1 of the example is made into a button battery S1 by a conventional method in the art.

Embodiment 2

[0043] The same steps as in Example 1 were used to prepare the electrolyte and button cells, except that in step (1), 0.5 parts by weight of 2,3 pyridinedicarboxylic anhydride was replaced by 1 part by weight of 3,4 pyridinedicarboxylate Acid anhydride, the non-aqueous electrolyte solution C2 of the lithium ion battery and the button battery S2 are prepared.

Embodiment 3

[0045] Adopt the same steps as in Example 1 to prepare non-aqueous electrolyte and button cell, the difference is that in step (1), 0.5 parts by weight of 2,3 pyridine dicarboxylic anhydride is replaced by 3 parts by weight of 2,3 pyridine Oxine dicarboxylic anhydride, obtain lithium ion battery non-aqueous electrolyte solution C3 and button battery S3.

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Abstract

The invention relates to an electrolyte for a lithium ion battery. The electrolyte contains an organic solvent, a lithium salt and an additive. The electrolyte provided by the invention contains the six-membered heterocyclic carboxylic acid anhydride additive, so that gas production and interface impedance increase of the battery can be effectively inhibited, the high-temperature stability of the battery is improved, and the service life of the battery is prolonged.

Description

technical field [0001] The present disclosure relates to the field of lithium batteries, in particular, to an electrolyte solution for a lithium ion battery and the lithium ion battery. Background technique [0002] Lithium-ion batteries have a high energy density and have always been an indispensable battery system in the battery market. However, due to the parasitic reaction between the interface and the electrolyte in the battery system during the quotation process, gas will be generated and the interface impedance will increase. Swelling occurs, battery life decreases, etc. Especially in recent years, the pursuit of battery energy density, the continuous introduction of high-voltage cathode materials, and the research on electrolytes that match high-voltage materials have also become a top priority. The current application limit voltage of the electrolyte system is 4.2V, which exceeds 4.2V. The V electrolyte will be oxidized at the positive electrode, resulting in gas p...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/42
CPCH01M10/0567H01M10/058H01M10/0525H01M10/4235H01M10/42Y02E60/10Y02P70/50H01M2300/0025H01M10/052H01M10/0568H01M2300/0028H01M10/0569
Inventor 乔飞燕鲁平王海军郝嵘潘仪
Owner BYD CO LTD
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