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Lithium-ion battery and its electrolyte

A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion batteries and their electrolytes, can solve the problems of deterioration of the storage performance of lithium-ion batteries, the cycle performance of lithium-ion batteries is not as good as that of lithium-ion batteries, etc., and achieves excellent storage performance and The effect of cycle performance

Active Publication Date: 2017-11-21
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

from figure 1 It can be seen that the lithium-ion battery using fluoroethylene carbonate (FEC) and 1,3-propane sultone (PS) has good storage performance at a charge cut-off voltage of 4.4V, but when the voltage is 4.45 The storage performance of lithium-ion batteries deteriorates significantly when V
from figure 2 It can be seen that the cycle performance of the lithium-ion battery under the condition of 4.45V is obviously not as good as that of the lithium-ion battery under the condition of 4.4V

Method used

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  • Lithium-ion battery and its electrolyte
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  • Lithium-ion battery and its electrolyte

Examples

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Effect test

Embodiment 1

[0050] Prepare lithium-ion battery according to the method of comparative example 1, just in the step of preparing the electrolyte solution of lithium-ion battery (i.e. in step (1)):

[0051] The additive is 5% fluoroethylene carbonate (FEC) in the electrolyte solution of the lithium-ion battery, 1,3-propane with a mass percentage of 4% in the electrolyte solution of the lithium-ion battery The content of sultone (PS) and tetraethylcyanotitanate in the electrolyte solution of the lithium-ion battery is 0.5%.

Embodiment 2

[0053] Prepare lithium-ion battery according to the method of comparative example 1, just in the step of preparing the electrolyte solution of lithium-ion battery (i.e. in step (1)):

[0054] The additive is 5% fluoroethylene carbonate (FEC) in the electrolyte solution of the lithium-ion battery, 1,3-propane with a mass percentage of 4% in the electrolyte solution of the lithium-ion battery The content of sultone (PS) and tetrapropanecyano titanate in the electrolyte solution of the lithium ion battery is 0.5%.

Embodiment 3

[0056] Prepare lithium-ion battery according to the method of comparative example 1, just in the step of preparing the electrolyte solution of lithium-ion battery (i.e. in step (1)):

[0057] The additive is 5% fluoroethylene carbonate (FEC) in the electrolyte solution of the lithium-ion battery, 1,3-propane with a mass percentage of 4% in the electrolyte solution of the lithium-ion battery The content of sultone (PS) and tetrabutylcyano titanate in the electrolyte solution of the lithium-ion battery is 0.5%.

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Abstract

The invention provides a lithium ion battery and an electrolyte solution thereof. The electrolyte solution of the lithium ion battery includes: a non-aqueous organic solvent; a lithium salt dissolved in the non-aqueous organic solvent; and additives. The additives comprise fluoroethylene carbonate (FEC), 1, 3-propane sultone (PS) and cyano-containing titanate. The lithium ion battery comprises the electrolyte solution of the lithium ion battery. The lithium ion battery provided by the invention has excellent storage performance and cycle performance under high temperature and high pressure.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium ion battery and an electrolyte thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, wide operating temperature range, and environmental protection, and have become the main energy source for mobile electronic devices. However, in recent years, the rapid development of mobile electronic devices, especially smartphones, has put forward higher demands on the energy density of lithium-ion batteries. [0003] In order to increase the energy density of lithium-ion batteries, it is usually a very effective way to use positive electrode active materials with higher charge cut-off voltage. However, these positive electrode active materials with high charge cut-off voltage have strong oxidative properties under high temperature and high pressure, so that the electrolyte is easily oxidized and decomposed, ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCY02E60/10
Inventor 张明付成华唐超
Owner CONTEMPORARY AMPEREX TECH CO