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High-voltage electrolyte additive, high-voltage electrolyte and lithium ion battery

An electrolyte additive and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem that the effect needs to be further improved, and achieve the effect of ensuring high-voltage cycle performance, uniform SEI film, and inhibiting oxidative decomposition.

Pending Publication Date: 2022-01-11
湖南法恩莱特新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the effect needs to be further improved

Method used

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  • High-voltage electrolyte additive, high-voltage electrolyte and lithium ion battery
  • High-voltage electrolyte additive, high-voltage electrolyte and lithium ion battery

Examples

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preparation example Construction

[0039] The preparation method of lithium hexafluorozirconate in the embodiment of the present invention is as follows:

[0040] Mix and stir the fluorozirconate solution and lithium fluoride (2:1 molar ratio) for 72 hours to obtain a lithium fluorozirconate suspension, separate the solid from the liquid, wash and dry.

Embodiment 1

[0042] This embodiment is a high-voltage electrolyte additive, including the following preparation raw materials in parts by weight:

[0043] 2 parts of lithium fluorozirconate, 8 parts of ethyl (2,2,2-trifluoroethyl) carbonate, phosphorus additives (tris(trimethylsilane) phosphite and tripropargyl phosphate in a mass ratio of 1:1) 3 parts and heterocyclic compound (the mass ratio of benzotriazole and terthiophene is 1:1) 0.1 part.

Embodiment 2

[0045] This embodiment is a high-voltage electrolyte, including the following preparation raw materials in parts by weight:

[0046] 1 part of high-voltage electrolyte additive (prepared in Example 1), 60 parts of solvent (mass ratio of ethyl methyl carbonate, dimethyl carbonate and ethylene carbonate: 5:20:3) and 12 parts of lithium salt (lithium hexafluorophosphate).

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Abstract

The invention discloses a high-voltage electrolyte additive, a high-voltage electrolyte and a lithium ion battery. The electrolyte additive disclosed by the invention is prepared from the following raw materials: lithium fluozirconate, ethyl(2, 2, 2-trifluoroethyl)carbonate, a phosphorus additive and a heterocyclic compound. The high stability of the ethyl(2, 2, 2-trifluoroethyl)carbonate can prevent the electrolyte from being greatly oxidized on the surface of the anode, so that the high-voltage cycle performance of the electrolyte is ensured, and meanwhile, the capacity retention ratio of the battery is ensured. By adding the lithium fluozirconate, the phosphorus additive and the heterocyclic compound, the formation of the SEI film can be regulated and controlled, so that the SEI film is more uniform, the impedance of the SEI film is reduced, and the capacity retention ratio of the battery is further improved. Meanwhile, the lithium fluozirconate, the phosphorus additive and the heterocyclic compound can further inhibit oxygenolysis of the electrolyte under high voltage.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage electrolyte additive, a high-voltage electrolyte and a lithium-ion battery. Background technique [0002] With the growing market of new energy electric vehicles, lithium-ion batteries, as the main source of power, are facing challenges: improving the energy density of batteries and increasing the cruising range of electric vehicles. [0003] Improving the working voltage of the battery and the specific capacity of the positive and negative electrode materials is an effective way to increase the energy density of lithium-ion batteries. Currently limited by the electrochemical window of the commercial electrolyte, the potential of the commercial positive electrode materials used is below 4.3V, such as lithium iron phosphate (LiFePO 4 ), lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ) Ternary materials such as 111 type and so on. W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/056H01M10/0525
CPCH01M10/0567H01M10/056H01M10/0525Y02E60/10
Inventor 邵俊华李海杰孔东波张利娟王郝为郭飞闫国锋宋东亮王亚洲侯红歧谢佳庆韩飞乔文忠
Owner 湖南法恩莱特新能源科技有限公司
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