Nonaqueous electrolyte for high-specific-energy lithium batteries

A non-aqueous electrolyte and lithium battery technology, which is applied in the field of lithium batteries, can solve the problems that the battery intercalation and delithiation reactions cannot proceed normally, the stability window is low, and the volume effect is low.

Active Publication Date: 2018-09-14
SHANDONG HIRONG POWER SUPPLY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon has serious volume expansion (about 300%) during charge and discharge. The huge volume effect and low conductivity limit the commercial application of silicon negative electrode technology. In related technologies, the carbonate-based electrolyte used The stability window is low. When the battery voltage reaches about 4.5V (vs. Li / Li+), the electrolyte will start a violent oxidation and decomposition reaction, which will cause the lithium intercalation and desorption reaction of the battery to fail to proceed normally.

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  • Nonaqueous electrolyte for high-specific-energy lithium batteries
  • Nonaqueous electrolyte for high-specific-energy lithium batteries
  • Nonaqueous electrolyte for high-specific-energy lithium batteries

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Embodiment Construction

[0028] The invention discloses a non-aqueous electrolyte solution for a lithium battery with high specific energy. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to realize it. In particular, it should be pointed out that all similar replacements and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and the relevant personnel can obviously make changes or appropriate changes and combinations to the method and application described herein without departing from the content, spirit and scope of the present invention to realize and Apply the technology of the present invention.

[0029] Below in conjunction with embodiment, further set forth the present invention:

[0030] The present invention exemplifies the component content of 1 to 55...

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Abstract

The invention provides a nonaqueous electrolyte for high-specific-energy lithium batteries. The nonaqueous electrolyte comprises lithium salt, carbonic-ester-type organic solvents and / or carboxylic-ester-type organic solvents, high-pressure-type functional additives and other film formation additives. The molar concentration of the lithium salt in the nonaqueous electrolyte is in the range of 0.1-2mol / L. The molar concentration of the other film formation additives in the nonaqueous electrolyte is in the range of 0-0.5mol / L. The mass percentage of the high-pressure-type functional additives inthe nonaqueous electrolyte is in the range of 0.5-5%. The nonaqueous electrolyte has the advantages that stable film structures can be formed on surfaces of positive and negative electrode materialsof the high-specific-energy lithium batteries, side reactions between the positive and negative electrode materials and the electrolyte are inhibited, stability of the electrolyte in the high-specific-energy lithium batteries is improved, and accordingly, the cycle life of the high-specific-energy lithium batteries is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a non-aqueous electrolyte solution for high specific energy lithium batteries. Background technique [0002] With the rapid development of the needs of the times, the energy density requirements for lithium-ion batteries are gradually increasing. In 2016, my country released a hard indicator of power battery energy density. According to the "Energy Saving and New Energy Vehicle Technology Roadmap", the energy density target of pure electric vehicle power batteries in 2020 is 350W h / kg. In order to meet the energy demand of the new generation, it is imminent to develop new lithium battery negative electrode technology and improve lithium battery positive electrode voltage technology. [0003] Alloying silicon and lithium to form Li 15 Si 4 Phase, the theoretical specific capacity is as high as 3572mA h / g, which is much higher than the theoretical specific capacity of ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor任海李立飞刘永任加兴郭庆元王文斌王振强
OwnerSHANDONG HIRONG POWER SUPPLY MATERIAL