Electrolyte and lithium ion battery containing same

A lithium-ion battery and electrolyte technology, applied in the field of electrolyte, can solve problems such as the difficulty in desolvation of polyether solvents, poor wettability of electrode materials, and difficulty in lithium deposition, so as to overcome difficulties in lithium deposition, high degree of polymerization, and improve The effect of Coulombic efficiency

Pending Publication Date: 2021-12-07
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the defects of side reactions between the electrolyte and the negative electrode in the prior art, the defects of poor wettability of the electrolyte to the electrode material, the difficulty in desolvation of polyether solvents or lithium Defect problem of difficult deposition, providing an electrolyte and a lithium-ion battery containing the electrolyte, the lithium-ion battery containing the electrolyte has good cycle performance

Method used

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  • Electrolyte and lithium ion battery containing same
  • Electrolyte and lithium ion battery containing same
  • Electrolyte and lithium ion battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment is to illustrate the lithium ion battery prepared by using the electrolyte solution of the present invention.

[0054] (1) Preparation of electrolyte

[0055] In 100g of dimethoxyethane (DME) solvent, add additive A after dry treatment is 4-methyl vinyl sulfate 6g and additive B 4g, the oxidation potential of described additive B is 3.68V, and used additive B The structural formula of is as follows, denoted as B1,

[0056]

[0057] Then, lithium bisfluoroxanthinimide (LiFSI) was added to prepare an electrolyte solution with a concentration of 1.5M, and the electrolyte solution was denoted as E1.

[0058] (2) Preparation of lithium ion battery

[0059] Lithium metal negative electrode: roll a metal lithium strip with a thickness of 40 μm on a Cu current collector to obtain a negative lithium metal strip, and then cut it into a negative electrode sheet with a length of 44 mm and a width of 20 mm.

[0060] The positive electrode uses LiCoO 2 material...

Embodiment 2

[0063] This embodiment is to illustrate the lithium ion battery prepared by using the electrolyte solution of the present invention.

[0064] Lithium ion battery is prepared according to the same method as in Example 1, the difference is: in step (1), "additive B1" is replaced by additive B2, the oxidation potential of said additive B2 is 4.05V, and said The structural formula of additive B2 is as follows:

[0065]

[0066] The resulting lithium-ion battery was labeled L2.

Embodiment 3

[0068] This embodiment is to illustrate the lithium ion battery prepared by using the electrolyte solution of the present invention.

[0069] Lithium-ion batteries are prepared according to the same method as in Example 1, except that: in step (1), "additive A ethylene sulfate" is replaced by "propane sultone", and "additive B1" is replaced It is additive B3, the oxidation potential of said additive B3 is 3.90V, and the structural formula of said additive B3 is as follows:

[0070]

[0071] The resulting lithium-ion battery was labeled L3.

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses an electrolyte and a lithium ion battery containing the electrolyte. The electrolyte contains an ether solvent, an additive A and an additive B; the additive A is a compound containing an S = O bond, and the additive B is a compound with a structural formula as shown in a formula (1) or a formula (2), wherein R is H, alkyl or halogenated alkyl; R1, R2 and R3 are the same or different and are H, alkyl, halogenated alkyl, nitryl or formyl respectively, and R1, R2 and R3 are not H at the same time; and the cycle performance of the lithium ion battery containing the electrolyte is good.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] Out of the need for environmental protection, the power battery industry has developed rapidly around the world, and the production and sales of lithium batteries are increasing year by year. However, as the industrialization of lithium batteries gradually matures, the existing battery system can no longer meet the needs of power batteries. Safer and higher energy density is the inevitable trend of future power battery development. [0003] Lithium metal anode has become the darling of the battery industry due to its light weight and high energy density. However, lithium metal has a low potential, whether it is a liquid electrolyte or a solid electrolyte, there will be serious interface problems after contact with it. [0004] At present, for liquid electrolytes, co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0567H01M10/0569H01M10/0525H01M2300/0025H01M2300/0028Y02E60/10
Inventor 张百爽官向国周青林赞锐
Owner BYD CO LTD
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