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Lithium salt electrolyte additive and preparation method thereof, lithium ion electrolyte, and lithium ion battery

An electrolyte additive and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as high-voltage positive electrode instability, transition metal dissolution, and corrosion of the positive electrode surface, and achieve the effects of reducing impedance increase, inhibiting oxidation decomposition, and reducing corrosion

Active Publication Date: 2022-07-22
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

Improving the battery charge cut-off voltage is one of the effective methods to increase the energy density of the battery. However, the current commercial LiPF 6 Salt carbonate electrolyte is unstable at high pressure, LiPF 6 Decomposition produces LiF and PF 5 , LiF can significantly Li-ion battery impedance, PF 5 It will react with a small amount of water in the battery to produce HF, which will corrode the surface of the positive electrode, cause the transition metal to dissolve, cause the instability of the high-voltage positive electrode during the cycle, and increase the risk factor of the lithium-ion battery. The adverse factors of these electrolytes are serious This restricts the further development of lithium-ion batteries

Method used

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  • Lithium salt electrolyte additive and preparation method thereof, lithium ion electrolyte, and lithium ion battery
  • Lithium salt electrolyte additive and preparation method thereof, lithium ion electrolyte, and lithium ion battery
  • Lithium salt electrolyte additive and preparation method thereof, lithium ion electrolyte, and lithium ion battery

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preparation example Construction

[0052] The present invention has no special requirements for the preparation method of the lithium ion electrolyte, and only needs to mix the components of the lithium ion electrolyte evenly. The above electrolyte additives can be mixed uniformly.

[0053] The invention provides a lithium ion battery, comprising a positive electrode, a negative electrode, a diaphragm and an electrolyte, and the electrolyte is a lithium ion electrolyte.

[0054] 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, such as LiNi 0.5 Mn 1.5 O 4 .

[0055] The active material in the negative electrode material can be selected from at least one of metal lithium and lithium alloy.

[0056]

Embodiment 1

[0058] (1) Preparation of lithium salt electrolyte additive

[0059] In 20mL, 0.2mol / L ether solution containing raw materials, add 18mL, 0.2mol / L ether solution containing LiOH, adjust the pH of the solution to 7-10, stir at 50 ℃ for 2h to obtain white crystals, filter the crystals, Dry to obtain the finished product.

[0060] The structural formula of the raw material is as follows:

[0061]

[0062] (2) Preparation of electrolyte

[0063] Compound ① is dissolved in the base electrolyte as a lithium salt electrolyte additive, wherein the organic solvent in the base 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 0.01%.

[0064] The structural formula of compound ① is as follows:

[0065]

[0066] (3) Preparation of positive electrode sheet

[0067] Lithium nickel manganate (LiNi 0.5 Mn 1.5 O 4 ), conductive carbon black (Super-P) and binder polyvinylidene fluoride (PVDF) containing N...

Embodiment 2

[0073] The difference between this example and Example 1 is that (2) in the preparation of the electrolyte, the addition ratio of compound ① is 0.02%, and the remaining operations are performed according to the same steps as Example 1. The room temperature cycle performance data are shown in Table 1.

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Abstract

The invention relates to the technical field of lithium batteries, and discloses a lithium salt electrolyte additive, the structural formula of which is: 1 to R 7 Can independently represent hydrogen, C 1 ~C 10 Alkyl, C 1 ~C 10 Alkoxy, C 1 ~C 10 haloalkyl, C 1 ~C 10 haloalkoxy or ‑OLi, R 1 to R 7 At least one of them is ‑OLi. The lithium salt electrolyte additive of the invention has a high occupied molecular orbital (HOMO) energy level, forms a CEI film on the surface of the positive electrode, can separate the electrolyte from the positive electrode, and reduces the corrosion of the positive electrode by HF.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium salt electrolyte additive and a preparation method thereof, a lithium ion electrolyte and a lithium ion battery. Background technique [0002] With the rapid development of electric vehicles and large-scale energy storage industries, people have put forward higher requirements for the energy density and safety of lithium-ion batteries. Increasing the battery charge cut-off voltage is one of the effective ways to improve the battery energy density. However, currently commercial LiPF 6 Salt carbonate electrolytes are unstable at high pressure, LiPF 6 Decomposition produces LiF and PF 5 , LiF can significantly Li-ion battery impedance, PF 5 It will react with a small amount of water in the battery to generate HF. HF will corrode the surface of the positive electrode, causing the transition metal to dissolve, causing the instability of the high-...

Claims

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Application Information

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