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Additive for electrolyte of lithium ion battery and application of additive

A lithium-ion battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of batteries without fast charging performance, improve fast charging and rate discharge performance, and good solubility and wettability, and the effect of improving elasticity and strength

Inactive Publication Date: 2021-04-16
SHANGHAI CENAT NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The batteries prepared from the electrolyte described in the above scheme have no fast charge performance. Therefore, it is necessary to develop an electrolyte for lithium-ion batteries with high rate performance, good cycle performance and fast charge performance.

Method used

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  • Additive for electrolyte of lithium ion battery and application of additive
  • Additive for electrolyte of lithium ion battery and application of additive
  • Additive for electrolyte of lithium ion battery and application of additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a lithium ion battery, the specific preparation method is as follows:

[0047] (1) Electrolyte configuration: Mix 50g PC, 300gEC and 650g EMC in a glove box with a water content of less than 1ppm and an oxygen content of less than 2ppm, and add fully dried LiPF 6 The concentration of the lithium salt in the electrolyte was 1.2 mol / L to obtain a basic electrolyte. Add 0.2% additive N to the base electrolyte 3 -1 to obtain electrolyte E1.

[0048] (2) Battery production: Mix the positive electrode material Ni83, carbon black, conductive agent CNT, and PVDF in a ratio of 100:0.7:0.6:1.5, coat it on a 12 μm aluminum foil, and then dry it at 85°C. Mix carbon-coated silicon, carbon black, SBR, and CMC in a ratio of 100:0.9:1.9:1 and evenly coat them on 8 μm copper foil, then dry them at 90°C. A ceramic diaphragm is used as the diaphragm, and the positive and negative electrode sheets are wound or stacked to form a battery C1 by a conventional metho...

Embodiment 2

[0051] (1) Electrolyte configuration: Mix 60g PC, 320gEC and 620g EMC in a glove box with a water content of less than 1ppm and an oxygen content of less than 2ppm, and add fully dried LiBF 4 The concentration of the lithium salt in the electrolyte was 1.2 mol / L to obtain a basic electrolyte. Add 0.4% additive N to the base electrolyte 3 -2, to obtain electrolyte E1.

[0052] (2) Battery production: Mix the positive electrode material NCM111, carbon black, conductive agent CNT, and PVDF in a ratio of 100:0.7:0.6:1.5, coat it on a 12 μm aluminum foil, and then dry it at 85°C. Mix carbon-coated silicon oxide, carbon black, SBR, and CMC in a ratio of 100:0.9:1.9:1 and evenly coat them on an 8 μm copper foil, then dry them at 90°C. A ceramic diaphragm is used as the diaphragm, and the positive and negative electrode sheets are wound or stacked to form a battery C1 by a conventional method in the art.

[0053] (3) Formation aging process: The simulated battery is charged at 0.05...

Embodiment 3

[0055] The only difference between this embodiment and embodiment 1 is that 0.2% additive N is added to the electrolyte 3 -3, to obtain electrolyte E3, and the resulting battery is C3.

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Abstract

The invention provides an additive for an electrolyte of a lithium ion battery and an application of the additive. The additive comprises an organic azide compound, the structural general formula of the organic azide compound is shown as a formula I, wherein the mass fraction of the additive is 0.1-5% based on 100% of the mass of the electrolyte. The organic azide disclosed by the invention can form low-impedance interface films on the surfaces of the positive electrode and the negative electrode of the battery as an additive, so the quick charge and rate discharge performances of the battery can be effectively improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to an additive for lithium ion battery electrolyte and application thereof. Background technique [0002] Vehicle power batteries need good fast charging performance and rate discharge performance, as well as higher energy density. In order to make our lithium batteries achieve better fast charging performance, as an existing common technology, the pole pieces use lower surface density or lower compaction density during the battery manufacturing process, or add more lithium to the electrode formula. The conductive agent makes lithium ions intercalate better in the battery pole piece, but this will reduce the energy density of the battery. [0003] CN102683746A discloses an electrolyte additive for a lithium battery and an electrolyte and a battery using the additive. The additives are organic compounds containing P or B elements, preferably phosphate or borate comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCY02E60/10
Inventor 钟海敏赵文文时迎华
Owner SHANGHAI CENAT NEW ENERGY