Electrolyte and preparation method thereof, lithium ion battery and electric vehicle

A lithium-ion battery and electrolyte technology, applied in the field of energy storage, can solve the problems of poor heat resistance and hydrolysis resistance, large SEI film resistance, and poor rate performance.

Active Publication Date: 2021-06-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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Problems solved by technology

[0004] However, the existing commercial electrolyte salt is LiPF 6 , the solvent is carbonate, and the formed SEI film has a large impedance, resulting in poor rate performance. In addition, the P-F bond is easily hydrolyzed and broken, making it poor in heat resistance and hydrolysis resistance. Therefore, it is urgent to provide a new type of electrolyte for lithium-ion batteries. and lithium-ion battery

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  • Electrolyte and preparation method thereof, lithium ion battery and electric vehicle
  • Electrolyte and preparation method thereof, lithium ion battery and electric vehicle
  • Electrolyte and preparation method thereof, lithium ion battery and electric vehicle

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[0034] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] "One embodiment", "preferred embodiment", "embodiment" or "multiple embodiments" mentioned in this specification means that the specific features, structures, characteristics or functions described in conjunction with the embodiments are included in the present invention In at least one embodiment and may be in more than one embodiment. The appearances of the phrases "in one embodiment," "in an embodiment," or "in multiple embodiments" in various places in this specification are not necessarily all referring to the same embodiment or the same multiple embodiments.

[0036]T...

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Abstract

The invention relates to the technical field of energy storage, and provides an electrolyte for a lithium ion battery, the electrolyte comprises an electrolyte solvent and a composite lithium salt, the composite lithium salt can be dissolved in the electrolyte solvent, and the electrolyte solvent comprises an organic solvent and an additive; wherein the volume percentage content of the organic solvent in the electrolyte solvent is 80%-99%, the volume percentage content of the additive in the electrolyte solvent is 0.5%-5%, and the additive comprises tris (trimethylsilane) phosphite. According to the multiplying power type electrolyte for the lithium ion battery, the solvent composition is optimized, and the novel electrolyte salt and the additive are matched, so that the ionic conductivity of the electrolyte is improved, the component proportion of an SEI film is improved, Li < + > conduction is facilitated, a positive electrode structure is stabilized, and dissolution of transition metal ions is inhibited; therefore, the rate capability and the cycle performance of the lithium ion battery are improved, and the running stability of an electric vehicle using the lithium ion battery can also be improved.

Description

【Technical field】 [0001] The invention relates to the technical field of energy storage, in particular to an electrolyte and a preparation method thereof, a lithium ion battery and an electric vehicle. 【Background technique】 [0002] Lithium-ion batteries have been widely used in consumer electronics, electric vehicles, and energy storage due to their high specific energy and power density, long cycle life, and environmental friendliness. With the development of transportation, the demand for lithium-ion batteries (LIBs) has increased dramatically, such as electric vehicles (EVs), which urgently need to have good performance in terms of energy and power density, cycle life, safety, and charging time. In particular, lithium-ion batteries capable of rapid charging are essential to replace gasoline vehicles. However, the ability of lithium-ion batteries to achieve fast charging is very challenging. As we all know, when charging at a high rate, lithium metal will be precipitate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/0567H01M10/0568H01M10/0525H01M10/42B60L50/60
CPCH01M10/0569H01M10/0567H01M10/0568H01M10/0525H01M10/4235B60L50/60H01M2220/20H01M2300/0037H01M2300/004H01M2300/0042Y02T10/70Y02E60/10
Inventor 彭晓丽向勇刘胜男翁士杰钱超王献明岳敏宋宇闫宗楷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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