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Electrolyte for high-voltage lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of electrolyte, can solve the problems of capacity attenuation of lithium-ion battery, easy oxidation reaction of electrolyte, etc.

Inactive Publication Date: 2020-01-17
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high voltage, due to the increase of the reactivity of the cathode material, the electrolyte is prone to oxidation reaction, which leads to the rapid decline of the capacity of lithium-ion batteries under high voltage conditions.

Method used

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  • Electrolyte for high-voltage lithium ion battery
  • Electrolyte for high-voltage lithium ion battery
  • Electrolyte for high-voltage lithium ion battery

Examples

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preparation example Construction

[0028] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0029] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0030] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are used for description purposes only, and do not indicate or imply relative importance.

Embodiment 1

[0032] Electrolyte preparation: In an argon-filled glove box (moisture 6 Electrolyte solution, then sequentially add 0.2wt% dimethyl sulfonyl ethane, 0.5wt% lithium difluorophosphate and 1.0wt% tris(trimethylsilyl) phosphate, stir to obtain the lithium ion battery electrolysis of embodiment 1 liquid.

[0033] Preparation of the positive electrode sheet: the positive electrode active material nickel-cobalt-manganese ternary material LiNi 0.5 co 0.2 mn 0.3 o 2 , the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are fully stirred and mixed in the N-methylpyrrolidone system according to the mass ratio of 95:3:2, and coated on the positive electrode current collector Al foil. The positive electrode sheet was obtained after dry cold pressing.

[0034] Preparation of negative electrode sheet: Negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber (SBR), thickener sodium carboxymethyl cellulo...

Embodiment 2

[0038] All the other steps are the same as in Example 1, the only difference is that the preparation of electrolyte is different:

[0039] Electrolyte preparation: In an argon-filled glove box (moisture 6 Electrolyte, then successively add 0.5wt% dimethyl sulfonyl methane, 1.0wt% lithium difluorophosphate and 1.0wt% tris (trimethylsilyl) phosphate, stir to obtain the lithium ion battery electrolyte of embodiment 2 .

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Abstract

The invention provides an electrolyte for a high-voltage lithium ion battery as well as a preparation method and application of the electrolyte. The electrolyte can improve the high-voltage performance of the lithium ion battery. The high-voltage electrolyte for the lithium ion battery comprises a non-aqueous organic solvent, a lithium salt and an electrolyte additive, the electrolyte additive comprises a disulfuryl compound, lithium difluorophosphate and tris (trimethylsilyl) phosphate, the bis-sulfonyl compound can form a stable SEI film on the surface of a positive electrode, the lithium difluorophosphate can improve the Li < + > conductivity of the SEI film, and the tris (trimethylsilyl) phosphate has the higher electrochemical stability, so that the oxygenolysis of the electrolyte onthe surface of an electrode is prevented. Through the synergistic effect among the bis-sulfonyl compound, the lithium difluorophosphate and the tri (trimethylsilyl) phosphate, the prepared electrolyteis more stable in property under a high voltage, and the battery shows better cycle performance under the high voltage.

Description

technical field [0001] The invention relates to an electrolytic solution for a high-voltage lithium-ion battery, belonging to the technical field of electrolytic solutions. Background technique [0002] At present, the voltage range used by lithium-ion batteries is mainly 3.0-4.35V, which cannot meet people's demand for high energy. After years of continuous efforts by technicians, more and more high-voltage cathode materials (4.35V-5.0V) have been developed. However, under high voltage, due to the increase in the reactivity of the cathode material, the electrolyte is prone to oxidation reaction, which leads to the rapid decline of the capacity of lithium-ion batteries under high voltage conditions. Therefore, in order to meet the requirements of high-voltage lithium-ion batteries, it is necessary to develop a new lithium-ion battery electrolyte to improve the cycle performance of lithium-ion batteries under high-voltage conditions, so that high-voltage materials can be tru...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/058
CPCH01M10/0567H01M10/058H01M2300/0025Y02E60/10Y02P70/50
Inventor 吴茂祥郑香珍潘荧黄韬
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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