Electrolyte for low-temperature lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in electrolytes, secondary batteries, and secondary battery repair/maintenance, etc., can solve the problems of increasing negative lithium ion de-intercalation resistance, decreasing conductivity, and increasing electrolyte viscosity. , to achieve the effect of broadening the application temperature range and improving low temperature performance

Inactive Publication Date: 2021-05-25
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] While lithium-ion batteries have been developed rapidly, there are still some limitations that limit their applications, and the ambient temperature used is one of the important limiting factors
When the ambient temperature used is too low, the electrochemical performance of the lithium-ion battery will decrease proportionally. The main reasons are: (1) the lithium ion in the positive electrode material has a reduced electrical conductivity and a reduced ion diffusion rate at low temperatures; (2) At low temperatures, the viscosity of the electrolyte increases, the migration of lithium ions becomes difficult, and the impedance between the electrolyte, the electrolyte, and the interface increases; (3) the viscosity of the electrolyte increases at low temperatures, and the wettability of the separator is poor; (4 ) The lithium ion deintercalation resistance of the negative electrode increases

Method used

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  • Electrolyte for low-temperature lithium ion battery electrolyte and lithium ion battery
  • Electrolyte for low-temperature lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The electrolyte in this embodiment consists of a solvent, an additive and a lithium salt.

[0028] Lithium salt made from lithium hexafluorophosphate LiPF 6 (14%wt), lithium bisfluorosulfonimide LiFSI (1%wt). The mixed solvent consists of ethylene carbonate EC (25%wt), ethylmethyl carbonate EMC (30%wt), ethyl propionate EP (20%wt). The additive consisted of vinylene carbonate VC (5%wt), fluoroethylene carbonate FEC (5%wt).

[0029] Randomly select 6 lithium-ion batteries that have not been filled with liquid, and respectively inject the electrolyte solution provided in this embodiment in a low dew point drying room. The production of a complete lithium-ion battery is completed through standing, chemical formation, pretreatment, pumping, (secondary liquid injection), sealing, volume separation, and aging.

[0030] Lithium-ion batteries are organically assembled from positive pole pieces, separators, and negative pole pieces, and are sealed in the casing after being we...

Embodiment 2

[0032] The electrolyte in this embodiment consists of a solvent, an additive and a lithium salt.

[0033] Lithium salt made from lithium hexafluorophosphate LiPF 6 (13%wt), lithium bisfluorosulfonimide LiFSI (2%wt). The mixed solvent consists of dimethyl carbonate (10%wt), ethylene carbonate EC (20%wt), ethylmethyl carbonate EMC (25%wt), ethyl propionate EP (20%wt). The additive consisted of vinylene carbonate VC (5%wt), fluoroethylene carbonate FEC (5%wt).

[0034] Randomly select 6 lithium-ion batteries that have not been filled with liquid, and respectively inject the electrolyte solution provided in this embodiment in a low dew point drying room. The production of a complete lithium-ion battery is completed through standing, chemical formation, pretreatment, pumping, (secondary liquid injection), sealing, volume separation, and aging.

[0035] Lithium-ion batteries are organically assembled from positive pole pieces, separators, and negative pole pieces, and are sealed ...

Embodiment 3

[0037] The electrolyte in this embodiment consists of a solvent, an additive and a lithium salt.

[0038]Lithium salt made from lithium hexafluorophosphate LiPF 6 (12%wt), lithium bisfluorosulfonimide LiFSI (2%wt), lithium difluorophosphate LiPO 2 f 2 Composition (1% wt). The mixed solvent consists of dimethyl carbonate (10%wt), ethylene carbonate EC (20%wt), ethylmethyl carbonate EMC (25%wt), ethyl propionate EP (20%wt). The additive consisted of vinylene carbonate VC (5%wt), fluoroethylene carbonate FEC (5%wt).

[0039] Randomly select 6 lithium-ion batteries that have not been filled with liquid, and respectively inject the electrolyte solution provided in this embodiment in a low dew point drying room. The production of a complete lithium-ion battery is completed through standing, chemical formation, pretreatment, pumping, (secondary liquid injection), sealing, volume separation, and aging.

[0040] Lithium-ion batteries are organically assembled from positive pole pi...

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Abstract

The invention belongs to the technical field of lithium ion batteries. The invention discloses a low-temperature lithium ion battery electrolyte which is composed of a solvent, a lithium salt and an additive, the lithium salt is a mixed lithium salt and comprises at least one of lithium hexafluorophosphate or lithium tetrafluoroborate and a special lithium salt, and the special lithium salt is composed of at least one of lithium bis (oxalato) phosphate, lithium bis (fluorosulfonyl) imide or lithium difluorophosphate; and the weight percentage of the special lithium salt in the electrolyte is 0.5%-5.0%. The invention also discloses an electrolyte containing the low-temperature lithium ion battery electrolyte. Through necessary and selective addition and combination of the components, the purpose of the invention can be achieved, the low-temperature performance of the electrolyte is synergistically improved, the high-temperature performance is not lost, the application temperature range of the lithium ion battery is widened, and the influence of the environment on the performance of the battery is reduced to a certain extent. The electrolyte provided by the invention can meet low-temperature charging, and has low-temperature discharging performance different from the low-temperature discharging performance commonly required at present.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries. In particular, it relates to an electrolyte solution for a low-temperature lithium-ion battery and the lithium-ion battery. Background technique [0002] Since it was applied to 3C products by Sony in 1992, lithium-ion batteries have been gradually used in many fields, and have become more and more indispensable in the context of global new energy in the 21st century. Lithium-ion batteries are currently ideal energy storage devices due to their advantages such as high working voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long cycle life. [0003] Lithium-ion batteries usually consist of positive electrodes, negative electrodes, separators, electrolytes, and structural components. Among them, the electrolyte is an important part of the lithium-ion battery, known as the blood of the lithium-ion battery, which plays...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0525H01M10/0567H01M10/42
CPCH01M10/0568H01M10/0525H01M10/0567H01M10/4235H01M2300/0091Y02E60/10
Inventor 蒋勤虚王盈来
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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