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Electrolyte additive for high-voltage lithium ion battery and application of electrolyte additive

An electrolyte additive, a technology for lithium ion batteries, applied in the field of lithium ion batteries, can solve problems such as poor cycle performance, and achieve the effects of slowing down the formation of spinel phase, easy preparation, and alleviating voltage decay.

Pending Publication Date: 2021-06-18
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the cycle stability of high-voltage lithium-ion batteries, especially the problem of poor cycle performance of existing lithium-rich manganese-based and lithium cobalt oxide positive electrode materials, and proposes an improved electrolyte for high-voltage lithium-ion batteries. Innovative approach to improve cycling stability of materials at high voltages using a green and highly efficient electrolyte additive

Method used

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  • Electrolyte additive for high-voltage lithium ion battery and application of electrolyte additive
  • Electrolyte additive for high-voltage lithium ion battery and application of electrolyte additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Weigh a certain amount of β-carotene in an argon atmosphere glove box and put it in a transparent glass bottle, and add a certain amount of reference ternary electrolyte (1.0M LiPF6 in EC:DMC:EMC=1: 1:1Vol%), stirred overnight to fully dissolve the additive.

[0026] 2) Take the solution in 1) and filter it with a 0.22 μm filter membrane to obtain a clear 0.5 wt% electrolyte solution.

[0027] 3) A battery is assembled using the electrolyte.

[0028] At the same time, as a comparison, a battery was assembled using a reference electrolyte without additives as a comparative example.

[0029] Test results such as figure 1 As shown, the first-cycle charge specific capacity of the high-voltage electrolyte containing β-carotene additives is 315mAh / g, the discharge specific capacity is 257mAh / g, and the first-cycle Coulombic efficiency is 81.6%. The first cycle charge specific capacity of the battery without additives is 356mAh / g, the discharge specific capacity is 254mA...

Embodiment 2

[0032] 1) Weigh a certain amount of β-carotene in an argon atmosphere glove box and put it in a transparent glass bottle, and add a certain amount of reference ternary electrolyte (1.0M LiPF6 in EC:DMC:EMC=1: 1:1Vol%), stirred overnight to fully dissolve the additive.

[0033] 2) Take the solution in 1) and filter it with a 0.22 μm filter membrane to obtain a clear 0.1 wt% electrolyte solution.

[0034] 3) Assemble a battery with the electrolyte.

[0035] Test results: when the current density is 20mA / g, the first-cycle charge specific capacity is 319mAh / g, the discharge specific capacity is 243mAh / g, and the first-cycle coulombic efficiency is 76.2%. Then, after 100 cycles at a current density of 200mA / g, the discharge capacity of the battery is 164mAh / g, and the capacity retention rate reaches 92.7%.

Embodiment 3

[0037] 1) Weigh a certain amount of β-carotene in an argon atmosphere glove box and put it in a transparent glass bottle, and add a certain amount of reference ternary electrolyte (1.0M LiPF6 in EC:DMC:EMC=1: 1:1Vol%), stirred overnight to fully dissolve the additive.

[0038] 2) Take the solution in 1) and filter it with a 0.22 μm filter membrane to obtain a clear 5.0 wt % electrolyte solution.

[0039] 3) Assemble a battery with the electrolyte.

[0040] Test results: when the current density is 20mA / g, the first-cycle charge specific capacity is 305mAh / g, the discharge specific capacity is 214mAh / g, and the first-cycle coulombic efficiency is 70.1%. Then, after 100 cycles at a current density of 200mA / g, the discharge capacity of the battery is 144mAh / g, and the capacity retention rate reaches 97.3%.

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Abstract

The invention relates to an electrolyte additive for a high-voltage lithium ion battery and application of the electrolyte additive. The problem that a high-voltage positive electrode material of the lithium ion battery is poor in cycle performance is solved through a carotenoid additive. The mass fraction of the carotenoid additive is 0.05%-5%, a battery assembled by the electrolyte containing the additive can still show high coulombic efficiency and good cycle stability under high voltage, and the used additive is green, low in cost, non-toxic and pollution-free.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-voltage electrolyte additive for improving cycle performance of high-voltage lithium-ion batteries and an application thereof. Background technique [0002] Chemical power sources play a very important role in the new energy economy. Among them, lithium-ion batteries have been widely used in various fields as a pioneer of chemical power sources. But with the development of electric vehicles and various electronic products, the current energy and power density can no longer meet all the requirements of people. Cathode materials have always been the core of lithium-ion batteries. The optimization and improvement of cathode materials will greatly improve the use prospects of lithium-ion batteries, especially the increase in voltage can greatly increase the energy density of batteries. Among them, lithium-rich manganese-based cathode materials (xLi ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 范镜敏郑明森董全峰王雅静
Owner XIAMEN UNIV
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