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High-voltage resistant 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 poor structural stability, poor battery high-temperature cycle, high-temperature storage gas production, etc., to improve cycle and storage performance, improve structural stability, The effect of reducing gas production

Inactive Publication Date: 2019-11-05
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under this potential, the oxidation of lithium cobaltate material is enhanced, the transition metal is dissolved seriously, and the structural stability is deteriorated, which eventually leads to problems such as poor high-temperature cycle of the prepared battery, increased battery cycle swelling, and high-temperature storage gas production.

Method used

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  • High-voltage resistant electrolyte and lithium ion battery
  • High-voltage resistant electrolyte and lithium ion battery
  • High-voltage resistant electrolyte and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0038] In embodiment 1, the preparation method of a kind of high-voltage resistant lithium-ion battery provided by the present invention specifically comprises the following steps:

[0039] The first step is to prepare the electrolyte: in a dry environment, according to the weight ratio of different materials, mix the lithium salt, the preset solvent and the functional additive, and stir well to obtain the electrolyte;

[0040] In Example 1, in the first step, in a dry environment with moisture less than 5PPM, EC, PC, DEC, FEC, PP (that is, as a solvent) are used according to the mass ratio of 30:25:20:10:15 Mix well, then add lithium hexafluorophosphate LiPF 6 Mixed lithium salts including lithium dioxalate borate LiBOB, LiPF 6 The mass concentrations of LiBOB and LiBOB in the electrolyte are 10% and 5% respectively; then add additives, the additives of each component are based on the total mass percentage of the electrolyte, wherein TMSB1%, ADN is 3%, PS is 3%, DTD is 2 %,...

Embodiment 2

[0050] In embodiment 2, the preparation method of a kind of high-voltage resistant lithium-ion battery provided by the present invention, except the first step, other steps are the same as embodiment 1, and have the same battery performance test operation as embodiment 1 .

[0051] In Example 2, the first step is specifically: in a dry environment with a moisture content of less than 5PPM, EC, PC, DEC, FEC, and PP are mixed uniformly according to the mass ratio of 30:25:20:10:15, and then add Lithium hexafluorophosphate LiPF 6 Mixed lithium salts including LiTFSI, LiPF 6 The mass concentrations of LiTFSI and LiTFSI in the electrolyte are 10% and 5% respectively; then add additives, and the additives of each component are based on the total mass percentage of the electrolyte, wherein TMSB is 1%, ADN is 3%, PS is 3%, and DTD is 2%, VC 1.5%, after stirring evenly, the electrolyte sample was obtained.

Embodiment 3

[0053] In embodiment 3, the preparation method of a kind of high-voltage resistant lithium-ion battery provided by the present invention, except the first step, other steps are the same as embodiment 1, and have the same battery performance test operation as embodiment 1 .

[0054] In Example 3, the first step is specifically: in a dry environment with a moisture content of less than 5PPM, EC, PC, DEC, FEC, and PP are mixed uniformly in a ratio of 30:25:20:10:15. Then add lithium hexafluorophosphate LiPF 6 Mixed lithium salts including lithium dioxalate borate LiBOB, LiPF 6 The mass concentrations of LiBOB and LiBOB in the electrolyte are 10% and 5% respectively; then add additives, the additives of each component are based on the total mass percentage of the electrolyte, of which TMSB is 1%, ADN is 3%, PS is 5%, VC 1.5 %, after stirring evenly, the electrolyte sample was obtained.

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Abstract

The invention discloses a high-voltage resistant electrolyte. The high-voltage resistant electrolyte comprises 12-18wt% of lithium salt, 67-80wt% of solvent and 8-15wt% of functional additive, whereinthe lithium salt comprises LiPF6 and simultaneously comprises at least one of LiTFSI, LiFSI, LiBOB, LiODFB, LiBF4 and LiPOF2, the solvent comprises at least two of EC, PC, DEC, EMC and carboxylic ester and simultaneously comprises at least one of FEC, DEFC and isoflurane, and the functional additive comprises at least two of a nitrile additive, a boron-containing additive, a phosphorus-containingadditive and a sulfur-containing additive, FEC and VC. In the battery, a lithium cobalt positive electrode material is modified, and the structure stability is improved; the high-voltage resistant electrolyte is resistant to 4.5V, gas production is reduced, and the cycle and storage property is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage-resistant electrolyte and a lithium-ion battery. Background technique [0002] At present, lithium cobalt oxide material, as the positive electrode material with the highest energy density in lithium-ion batteries, is widely used in mobile phones, notebook computers, wearable products and other digital products and AI artificial intelligence products. [0003] As the functions of digital products become more and more complex, customers have higher and higher requirements for battery energy density. Increasing the charging voltage of the material is the most effective means to increase the energy density. From the date of the birth of lithium-ion batteries, it took about 20 years for lithium cobalt oxide materials to increase from 4.20V to 4.35V. In the past 5 years, with the technological progress of material science, the use voltage of lithium coba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/42H01M4/525
CPCH01M4/525H01M10/0525H01M10/0567H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 张志荣孔令丽王亚钟渤凡
Owner TIANJIN LISHEN BATTERY