Electrolyte additive, lithium ion high-voltage electrolyte and lithium ion battery

An electrolyte additive and electrolyte technology, which are applied in the fields of lithium ion high-voltage electrolyte, lithium ion battery, and electrolyte additive, can solve the problems of large limitations of electrode materials, inability to solve the problems of electrode and electrolyte liquid surface oxidation, etc. Instability problem, the effect of improving the diffusion rate of lithium ions, and improving the oxidation resistance

Active Publication Date: 2021-01-12
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010]The electrode materials used for the current electrolyte additive application have great limitations, and cannot solve the technical problem of electrode and electrolyte surface oxidation

Method used

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  • Electrolyte additive, lithium ion high-voltage electrolyte and lithium ion battery
  • Electrolyte additive, lithium ion high-voltage electrolyte and lithium ion battery
  • Electrolyte additive, lithium ion high-voltage electrolyte and lithium ion battery

Examples

Experimental program
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Effect test

preparation example Construction

[0038] The present invention has no special requirements for the preparation method of the lithium ion high-voltage electrolyte, and only needs to mix the components of the high-voltage electrolyte of the lithium battery uniformly. Then mix the above electrolyte additives evenly.

[0039] The invention provides a lithium ion battery, comprising a positive electrode, a negative electrode, a diaphragm and an electrolyte, characterized in that the electrolyte is a lithium ion high-voltage electrolyte.

[0040] Preferably, the active material of the positive electrode material can be selected from a composite lithium metal oxide containing three elements of nickel, cobalt and manganese, wherein the composite lithium metal oxide can be LiNi 0.5 mn 1.5 o 4 , Li 1.17 Ni 0.25 mn 0.58 o 2 、LiCoO 2 / Li or LiMn 2 o 4 .

[0041] The active material in the negative electrode material can be selected from at least one of lithium metal and lithium alloy.

[0042]

Embodiment 1

[0044] (1) Preparation of electrolyte

[0045] Compound ① is dissolved in the basic electrolyte as an electrolyte additive, wherein the organic solvent in the basic electrolyte is EC / DMC / EMC (volume ratio is 1:1:1), and the lithium salt is 1mol / L LiPF 6 , the addition ratio of compound ① is 0.005%.

[0046] The structural formula of compound ① is as follows:

[0047]

[0048] (2) Preparation of positive pole piece

[0049] Lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ), conductive carbon black (Super-P) and the binder polyvinylidene fluoride (PVDF) containing N-methyl-2-pyrrolidone (NMP) are mixed according to the mass ratio of 8:1:1, and the ball mill is used for 300r ball milling After 5 hours, the positive electrode slurry was obtained, and the positive electrode slurry was evenly coated on one side of the aluminum foil with a clean surface, dried, and cut into pieces to obtain positive electrode sheets for testing.

[0050] (3) Preparation of button half ce...

Embodiment 2

[0055] The difference between this example and Example 1 is that (1) in the preparation of the electrolyte, the addition ratio of compound ① is 0.01%, and the rest of the operations are carried out according to the same steps as in Example 1. Electrode preparation and electrochemical performance test test, obtained The high temperature cycle performance data are shown in Table 1.

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PUM

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Abstract

The invention relates to the technical field of lithium batteries, discloses an electrolyte additive, and discloses an electrolyte containing the electrolyte additive and a lithium ion battery. The electrolyte additive has a high occupied molecular orbital (HOMO) energy level, a CEI film is formed on the surface of a positive electrode, an electrolyte can be separated from the positive electrode,and corrosion of HF to the positive electrode is reduced. The electrolyte and the lithium ion battery can tolerate higher voltage, and have good cycle performance and safety performance under high voltage.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to electrolyte additives, lithium-ion high-voltage electrolytes and lithium-ion batteries. Background technique [0002] The spinel lithium nickel manganese oxide (LNMO) material has a high operating voltage of 4.75 V (relative to Li / Li + ) and a high theoretical specific capacity of 146.7mAh / g. The material composition does not contain Co, the preparation process is relatively simple, the cost is low, and it has the advantages of high safety. It has become the most potential next-generation commercial high-energy-density lithium-ion battery cathode. Material. [0003] However, LNMO still has deficiencies that limit its application. The deficiencies are as follows: 1. In the production of lithium nickel manganese oxide, the surface is exposed to strong oxidizing Ni 4+ It will catalyze the oxidative decomposition of the electrolyte; ②The electrolyte is LiP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0566H01M10/42H01M10/0525
CPCH01M10/0567H01M10/0566H01M10/4235H01M10/0525H01M2300/0025Y02E60/10
Inventor 谢正伟尚慧敏彭工厂瞿美臻
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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