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Cesium-containing high-voltage lithium ion battery electrolyte composite additive, electrolyte and battery thereof

A technology of lithium-ion batteries and composite additives, applied in the direction of secondary batteries, composite electrolytes, secondary battery repair/maintenance, etc., can solve the problems of battery performance deterioration, cycle performance deterioration, and aggravated side reactions, etc., to facilitate widespread application , improve electrochemical performance, improve the effect of interface characteristics

Active Publication Date: 2020-12-15
SONGSHAN LAKE MATERIALS LAB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, under high voltage, the positive electrode material interface will have a side reaction with the electrolyte, and the decomposition products of the electrolyte will form a thicker dielectric layer on the surface of the positive and negative electrodes, resulting in an increase in battery impedance and deterioration of battery cycle performance.
However, most of the additives are severely oxidized and decomposed under high voltage, causing battery performance to deteriorate, or even unable to cycle.
[0005] The application number is 201810874188.0, and the patent name is the functional electrolyte for long-life lithium-ion power batteries and its preparation method. By adding composite additives to the electrolyte, such as: vinylene carbonate VC, etc., and then adding cesium ions to improve the cycle of the battery However, under high voltage, there will be a large amount of decomposition of vinylene carbonate VC, which will deteriorate the performance of the battery. In addition, many cesium-containing compounds will aggravate side reactions under high voltage, resulting in a decrease in efficiency. Especially in full batteries, the cycle performance will deteriorate. , poor high voltage compatibility
[0006] Application number 201610896487.5, the patent name is new application of rubidium and cesium compounds, high-voltage electrolyte additives, high-voltage electrolyte and lithium-ion batteries, by adding rubidium and cesium compound additives in the electrolyte, the rate performance of the battery is improved, and the ternary and The rate performance of high-voltage lithium nickel manganese oxide half-cells, however, a single cesium-containing compound additive is decomposed under high voltage, and cannot form a stable interfacial film on the interface between the positive and negative electrodes, which will lead to a decrease in efficiency. In addition, although cesium-containing additives can Improve the rate performance and cycle performance of the half battery, but in the full battery, there is damage to the graphite negative electrode, causing the deterioration of the rate performance and cycle performance of the full battery

Method used

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  • Cesium-containing high-voltage lithium ion battery electrolyte composite additive, electrolyte and battery thereof
  • Cesium-containing high-voltage lithium ion battery electrolyte composite additive, electrolyte and battery thereof
  • Cesium-containing high-voltage lithium ion battery electrolyte composite additive, electrolyte and battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of cesium-containing high-voltage lithium-ion battery electrolyte:

[0030] In a glove box filled with argon, ethylene carbonate and dimethyl carbonate were mixed uniformly at a mass ratio of 1:1, and 0.05% cesium acetate and 1% tris(trimethylsilane) were added to the mixed solution. Phosphite and 2% lithium difluorophosphate, then slowly add lithium salt LiPF 6 , and stirred until it was completely dissolved to obtain cesium-containing high-voltage lithium-ion battery electrolyte solution A1.

[0031] Preparation of high-voltage lithium-ion batteries:

[0032] Will LiNi 0.5 mn 1.5 o 4 (LNMO) is used as the positive electrode active material, carbon black is used as the conductive additive, and carboxymethyl cellulose (CMC), styrene-butadiene copolymer (SBR) is used as the binder, and the mass ratio is 92:5:1 :2 After mixing evenly in water, coat the aluminum foil current collector, dry, cold press, cut into discs with a diameter of φ14mm, and place the...

Embodiment 2

[0034] Its difference from Example 1 is the preparation of cesium-containing high-voltage lithium-ion battery electrolyte:

[0035] In a glove box filled with argon, ethylene carbonate and dimethyl carbonate were mixed uniformly at a mass ratio of 1:1, and the mass fraction of 3% cesium trifluoroacetate, 2% tri(trimethylsilane) was added to the mixed solution ) phosphate and 0.1% lithium difluorodioxalate phosphate, then slowly add lithium salt LiPF 6 , and stirred until it was completely dissolved to obtain cesium-containing high-voltage lithium-ion battery electrolyte A2.

Embodiment 3

[0037] Its difference from Example 1 is the preparation of cesium-containing high-voltage lithium-ion battery electrolyte:

[0038]In a glove box filled with argon, ethylene carbonate and dimethyl carbonate were mixed uniformly at a mass ratio of 1:1, and 1% cesium azide, 3% bis(trimethyl Silicon-based) phosphite and 1% lithium tetrafluorooxalate phosphate, then slowly add lithium salt LiPF 6 , and stirred until it was completely dissolved to obtain cesium-containing high-voltage lithium-ion battery electrolyte solution A3.

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Abstract

The invention discloses a cesium-containing high-voltage lithium ion battery electrolyte composite additive, an electrolyte and a battery thereof. The cesium-containing high-voltage lithium ion battery electrolyte composite additive provided by the invention is formed by compounding a cesium compound, silicon-based phosphate and a phosphorus-containing lithium salt. Through the synergistic effectof the cesium compound, the silicon-based phosphate and the phosphorus-containing lithium salt, components of positive and negative electrode interfaces are changed, a composite interface film capableof stably existing at high voltage is formed on positive and negative electrode interfaces, and the composite interface film can effectively improve the interface characteristics of the high-voltagebattery, reduce the side reaction of an electrolyte and improve the electrochemical performance of the lithium ion battery. And the composite additive has the advantages of small addition amount, lowcost, simple synthesis and the like, is easy to implement and is beneficial to wide popularization and application.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a cesium-containing high-voltage lithium ion battery electrolyte composite additive, electrolyte and battery thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high specific power, high conversion rate, long life, and no pollution, and have been rapidly popularized. Their applications have gradually shifted from portable electronic products and communication tools to the power supply field. The lithium battery industry has a good According to the development trend, the production capacity of lithium-ion batteries has reached 198GWh in 2019, and it is estimated that by 2030, the production capacity will reach 3392GWh, an increase of nearly 17 times. [0003] However, with the expansion of science and technology and application fields, higher requirements are placed on the energy density and cycle perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0088Y02E60/10
Inventor 詹元杰黄学杰武怿达马晓威
Owner SONGSHAN LAKE MATERIALS LAB
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