Lithium-ion electrolyte for improving interface of lithium ion pole piece

A technology of lithium ion and electrolyte, which is applied in the field of lithium ion electrolyte to improve the interface of lithium ion pole pieces, can solve problems such as safety risks, inability to fully embed lithium ions, and decrease in mass transfer and conduction speed, so as to improve safety performance and electrochemical performance, prolong the service life of charge and discharge cycles, and reduce the effect of lithium precipitation on charge

Inactive Publication Date: 2018-01-12
长沙小新新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The discharge capacity of lithium-ion batteries decays quickly in low-temperature environments, and the interface of the negative electrode is prone to lithium deposition in low-temperature environments, resulting in irreversible damage to the battery. In severe cases, it is more likely to cause safety hazards due to lithium deposition in the battery
One way to increase the energy density of the battery is to increase the compaction density of the battery pole piece, but the increase in the compaction density means that the mass transfer and conductivity speed of the material is reduced, and the impedance is increased, which makes the pole piece prone to exist during the use of the battery. Lithium, dark spots, etc.
On the other hand, during the rapid charging of lithium batteries, more lithium ions are released from the positive electrode into the negative electrode per unit time, and the lithium ions cannot be completely embedded in the negative electrode due to the mass transfer resistance of the negative electrode under the drive of a large current. Staying on the outside of the pole piece will cause lithium precipitation and block the lithium ion transmission channel. Over time, the battery will become thicker and deformed, which will easily cause safety risks

Method used

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  • Lithium-ion electrolyte for improving interface of lithium ion pole piece
  • Lithium-ion electrolyte for improving interface of lithium ion pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, the preparation of the lithium ion electrolyte solution for improving the interface of the lithium ion pole piece is as follows:

[0023] In a glove box (moisture <10ppm, oxygen content <1ppm) full of argon, configure an organic solvent, with a purity of 98.92% ditrichloromethyl carbonate 25%, a purity of 99.67% diethyl carbonate 50%, a purity Mix 25% of 98.92% ether compound 1.2-dimethoxyethane, and stir evenly to obtain an organic solvent. Slowly add 83.5% of the total mass of the lithium-ion battery electrolyte into the organic solvent that accounts for the lithium-ion battery electrolyte The percentage of the total mass of the solution is 15% of the lithium salt complexed lithium borate, and then slowly adding the additive 1,4-butane sultone accounting for 1.5% of the total mass of the lithium-ion battery electrolyte, stirring under a carbon dioxide atmosphere Until it is completely dissolved, the lithium ion electrolyte of Example 1 is obtained....

Embodiment 2

[0025] In this embodiment, the preparation of the lithium ion electrolyte solution for improving the interface of the lithium ion pole piece is as follows:

[0026] In a glove box (moisture <10ppm, oxygen content <1ppm) filled with argon gas, an organic solvent is configured, and the purity is 98.92% fluoroethylene carbonate 55%, the purity is 99.67% diethyl carbonate 20%, the purity is 98.92% % ether compound dioxolane 25% mixes, stirs evenly, obtains the organic solvent, gets the percentage that accounts for the total mass of lithium-ion battery electrolyte and is slowly added in the organic solvent that accounts for 67% of the total mass of lithium-ion battery electrolyte. 27% lithium perchlorate, and then slowly add vinylene carbonate accounting for 6% of the total mass of the lithium-ion battery electrolyte, and stir until it is completely dissolved to obtain the lithium-ion electrolyte of Example 2.

Embodiment 3

[0028] In this embodiment, the preparation of the lithium ion electrolyte solution for improving the interface of the lithium ion pole piece is as follows:

[0029] In a glove box (moisture <10ppm, oxygen <1ppm) filled with argon gas, an organic solvent is configured, and the purity is 98.92% cyclic carbonate 45%, the purity is 99.67% diethyl carbonate 30%, the purity is 98.92% Ether compound 25% is mixed, stirs evenly, obtains organic solvent, (wherein, cyclic carbonate is ditrichloromethyl carbonate, fluoroethylene carbonate, ethylene carbonate, ethyl methyl carbonate by weight ratio 1 : 1:1:1 mixed, the ether compound is dioxolane, 1.2-dimethoxyethane, ethylene glycol dimethyl ether mixed in a weight ratio of 1:1:1), and the lithium The percentage of the total mass of the electrolyte of the lithium-ion battery is 75% of the organic solvent, slowly adding the lithium salt that accounts for 20% of the total mass of the electrolyte of the lithium-ion battery, and then slowly a...

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Abstract

The invention provides a lithium-ion electrolyte for improving an interface of a lithium ion pole piece, and relates to the technical field of lithium ion batteries. The lithium-ion electrolyte for improving the interface of the lithium ion pole piece comprises the following components in percentage by total mass:15%-27% of a lithium salt, 1.5%-6% of an additive and the balance of an organic solvent. The lithium-ion electrolyte for improving the interface of the lithium ion pole piece improves the heat stability of an SEI (Solid Electrolyte Interphase) film formed in the primary charge-discharge process of a lithium battery, and prolongs the charge-discharge cycle life of the lithium battery at the low temperature, the probability of swelling of the lithium battery is reduced, so that thesafety performance and the electrochemical performance of the lithium battery are improved, and the potential safety hazard of the lithium ion battery is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and relates to a lithium ion electrolyte for improving the interface of lithium ion pole pieces. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, electric vehicles, military aerospace and other fields due to their high working voltage, high energy density, long cycle life, and environmental friendliness. With the improvement of people's living standards, higher requirements are put forward for the working environment, energy density, and fast charging and discharging of lithium-ion batteries. The discharge capacity of lithium-ion batteries decays quickly in low-temperature environments, and the negative electrode interface is prone to lithium deposition in low-temperature environments, resulting in irreversible damage to the battery. In severe cases, it is more likely to cause safety hazards due to lithium deposition in the battery. One wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/42H01M10/0525
CPCY02E60/10
Inventor 不公告发明人
Owner 长沙小新新能源科技有限公司
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