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Electrolyte and lithium battery

An electrolyte and lithium battery technology, applied in the field of electrolyte containing additives, can solve the problem that HF ​​cannot be fundamentally eliminated

Pending Publication Date: 2022-04-15
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above method cannot fundamentally eliminate HF

Method used

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  • Electrolyte and lithium battery
  • Electrolyte and lithium battery
  • Electrolyte and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The lithium battery of Embodiment 1 comprises a battery case, and a positive electrode assembled in the battery case (refer to figure 1 ), negative electrode, single-layer polypropylene separator, and electrolyte. Wherein, the positive electrode includes an aluminum foil and a positive electrode film coated on the surface of the aluminum foil, and the positive electrode film includes nickel cobalt lithium manganese oxide (NCM811) with a mass ratio of 80:10:10, conductive carbon black, and polybias Vinyl fluoride. The negative electrode includes copper foil and a negative electrode film coated on the surface of the copper foil, and the negative electrode film includes graphite, conductive carbon black, and lithium polyacrylate in a mass ratio of 96:1.5:2.5. The electrolyte includes ethylene carbonate (EC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC) with a volume ratio of 1:1:1, lithium hexafluorophosphate with a concentration of 1mol / L, and a mass percent co...

Embodiment 2

[0055] The difference from Example 1 includes: the mass percent content of lithium bistrimethylsilylamide is 2%.

[0056] Other features are the same as those in Embodiment 1 and will not be repeated.

Embodiment 3

[0058] The difference from Example 1 includes: the additive is sodium bis(trimethylsilyl)amide, and the content of sodium bis(trimethylsilane)amide is 5% by mass.

[0059] Other features are the same as those in Embodiment 1 and will not be repeated.

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Abstract

An electrolyte contains a lithium salt, an organic solvent and an additive, the structural formula of the additive is shown in the specification, n is an integer from 1 to 6, m is an integer from 1 to 6, and Mn < + > is Li < + >, Na < + >, K < + >, Zn < 2 + >, Mg < 2 + >, Cu < 2 + >, Fe < 3 + >, Nd < 3 + >, La < 3 + >, Fe < 3 + >, Ce < 3 + >, Sc < 3 + >, Pr < 3 + >, Sm < 3 + >, Sn < 4 + >, Ge < 4 + >, Ti < 4 + >, Zr < 4 + >, V < 5 + >, As < 5 + > or Cr < 6 + >. The invention also provides a lithium battery comprising the electrolyte. The lithium battery provided by the invention has relatively high mass specific capacity.

Description

technical field [0001] The present application relates to the technical field of lithium batteries, in particular to an electrolyte solution containing additives, and a lithium battery using the electrolyte solution. Background technique [0002] In order to adapt to the development of the new energy industry and electric vehicles, lithium batteries need to develop in the direction of high-quality specific capacity, high power, high safety and long life. Layered positive electrode materials (such as nickel-cobalt lithium manganese oxide, nickel-cobalt lithium aluminate, etc.) have good safety and high specific capacity. In order to further improve the mass specific capacity of lithium batteries, it is a direct way to increase the charge cut-off voltage. The way. However, the higher the charge cut-off voltage, the larger the volume inside the positive electrode material, and the easier it is to accumulate internal stress to generate microcracks, and even cause the entire gra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0566H01M10/0567
CPCH01M10/052H01M10/0566H01M10/0567
Inventor 贺艳兵张丹丰杨科马家宾张琛王鹏何远标陈振康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV