Electrolyte for improving performance of lithium ion battery, preparation method of electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as the harmful effect of decomposition products on battery performance, the problem of gas production from decomposition products, etc.

Pending Publication Date: 2022-02-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Problems solved by technology

The electrolyte additives in the existing reports are all organic systems. Although this system

Method used

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  • Electrolyte for improving performance of lithium ion battery, preparation method of electrolyte and lithium ion battery
  • Electrolyte for improving performance of lithium ion battery, preparation method of electrolyte and lithium ion battery
  • Electrolyte for improving performance of lithium ion battery, preparation method of electrolyte and lithium ion battery

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[0030] The present invention also provides a method for preparing an electrolyte for improving lithium battery performance, comprising the following steps:

[0031] A) adding the additive into the organic solvent, stirring and heating until the additive is completely dissolved to obtain an additive solution; the additive is simple sulfur; the mass concentration of the additive is 0.1-2 mg / mL;

[0032] B) After lithium salt is added to the additive solution, an electrolyte solution for improving the performance of the lithium-ion battery is obtained.

[0033] In the present invention, it is preferred to firstly mix the cyclic carbonate and the chain carbonate under a protective gas atmosphere to obtain an organic solvent.

[0034] The types and amounts of the cyclic carbonates and chain carbonates are the same as those described above, and will not be repeated here.

[0035] In the present invention, the protective gas is preferably an inert gas, more preferably high-purity ar...

Embodiment 1-5

[0045] A preparation method of an electrolyte for improving lithium-ion battery performance, comprising the following steps:

[0046] The first step: in a room temperature environment filled with high-purity argon, add 10ml of ethylene carbonate and dimethyl carbonate with a volume ratio of 3:7 into the sample bottle to form a mixed solution;

[0047] The second step: adding elemental sulfur as an additive to the mixed solution of the first step, stirring the solution with the additive, and heating at 80°C until the elemental sulfur is completely dissolved;

[0048] The third step: dissolving 1M lithium hexafluorophosphate in the mixed solution of the second step.

[0049] Considering the influence of the content of elemental sulfur on the performance of lithium-ion batteries, under the condition that other conditions remain unchanged, only by changing the content of elemental sulfur to carry out the transformation of the embodiment, and investigating the effect of electrolyte...

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Abstract

The invention provides an electrolyte for improving the high-voltage performance of a lithium ion battery. According to the electrolyte, absorption peaks exist at 221 nm to 240 nm and 271 nm to 302 nm through ultraviolet spectrophotometry determination; the electrolyte comprises a lithium salt, an organic solvent and an additive, the additive is elemental sulfur; and the mass concentration of the additive is 0.1 to 2 mg/mL. The elemental sulfur is added, so that an electrolyte interface film generated by oxygenolysis during battery charging improves an electrode and electrolyte interface, an interface protection film is more compact, continuous decomposition of the electrolyte and dissolution of transition metal in a positive electrode material are inhibited, and finally, the performance of the battery containing the electrolyte is relatively stable; and the high-voltage cycle performance of the prepared lithium ion battery at 3-4.5 V is improved. The invention also provides a preparation method of the electrolyte for improving the high-voltage performance of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrolyte solution for improving the performance of lithium ion batteries, a preparation method thereof and lithium ion batteries. Background technique [0002] Due to the high energy density of lithium-ion batteries, lithium-ion batteries are widely used in energy storage equipment and transportation fields. However, in order to make lithium-ion batteries better used in the automotive industry, many problems need to be solved, such as: safety, cost, high energy density and service life. One of the effective ways to increase the energy density of lithium-ion batteries is to increase the operating voltage of the batteries. [0003] High-voltage cathode materials, such as: LiNi 0.5 mn 1.5 o 4 、LiCoPO 4 , lithium-rich layered oxides (xLi 2 MnO 3 ·(1-x)LiMO 2 (M=Ni, Co, Mn)) and ternary layered structure compound LiNi x co y mn z o 2 (NCM; 0...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0566H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0567H01M10/0566H01M10/0568H01M10/0569H01M10/0525H01M2300/0025H01M2300/0028H01M2300/0091Y02E60/10
Inventor 夏永高熊建伟常凤真
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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