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Electrolyte for aluminum negative electrode energy storage device, aluminum negative electrode energy storage device and preparation method thereof

An electrolyte and negative electrode technology, which is applied in the field of electrochemical energy storage devices, can solve the problems of poor matching of Al negative electrode system, poor battery cycle performance, and poor low-temperature performance, so as to improve low-temperature charge and discharge performance and discharge performance. , low viscosity effect

Active Publication Date: 2020-12-18
REAL POWER IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing low-temperature technology is applied to the relatively mature graphite anode system, which is not well matched with the Al anode system. The existing electrolyte system affects the capacity of the battery and the cycle performance of the battery in the Al anode system. Poor, and the system with better normal temperature cycle has poor low temperature performance, especially the discharge capacity at -30°C

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  • Electrolyte for aluminum negative electrode energy storage device, aluminum negative electrode energy storage device and preparation method thereof

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preparation example Construction

[0052] According to a second aspect of the present invention, there is provided a method for preparing an electrolyte for an aluminum negative electrode energy storage device, comprising the following steps:

[0053] The lithium salt, the organic solvent and the additive are uniformly mixed to obtain an electrolyte solution for an aluminum negative electrode energy storage device.

[0054] The preparation method of the electrolytic solution of the aluminum negative electrode energy storage device of the present invention is simple, convenient to operate, and can be mass-produced.

[0055] In one embodiment, a method for preparing an electrolyte for an aluminum negative energy storage device comprises the following steps:

[0056] Mix the cyclic ester solvent and the linear ester solvent in proportion, add additives and mix to obtain a solvent; then add lithium molecular sieves to dry, then add lithium salt at a temperature of 0-15°C to obtain an aluminum negative electrode ene...

Embodiment 1

[0089] A low-temperature electrolyte comprising: Lithium salt LiPF 6 , organic solvents include 10vol% fluoroethylene carbonate (FEC), 10vol% propylene carbonate (PC), 40vol% diethyl carbonate (DEC) and 40vol% ethyl methyl carbonate (EMC) (based on organic Solvent, and be 100%), additive is vinylene carbonate (VC) and fluoroethylene carbonate (FEC), the molar concentration of lithium salt in organic solvent is 1mol / L, fluoroethylene carbonate (FEC) in The mass percent content of the lithium salt and the organic solvent is 5%, and the mass percent content of vinylene carbonate (VC) in the lithium salt and the organic solvent is 5%.

[0090] The preparation method of low-temperature electrolyte comprises the following steps:

[0091] FEC, PC, DEC and EMC are mixed in proportion, each independently adding 5% (accounting for the mass ratio of lithium salt and organic solvent) of FEC and VC as additives, after mixing to obtain the electrolyte solvent, add 10% (mass ratio than) Li...

Embodiment 2

[0093] A low-temperature electrolyte comprising: Lithium salt LiPF 6 , organic solvents include 10vol% ethylene carbonate (EC), 40vol% ethyl methyl carbonate (EMC), 10vol% dimethyl carbonate (DMC), 10vol% diethyl carbonate (DEC) and 30vol% Ethyl propionate (EP) (benchmark is organic solvent, sum is 100%), additive is vinylene carbonate (VC) and fluoroethylene carbonate (FEC), the molar concentration of lithium salt in organic solvent is 1mol / L, the mass percentage of fluoroethylene carbonate (FEC) in lithium salt and organic solvent is 5%, and the mass percentage of vinylene carbonate (VC) in lithium salt and organic solvent is 5%.

[0094] The preparation method of low-temperature electrolyte comprises the following steps:

[0095] EC, EMC, DMC, DEC and EP are mixed in proportion, each independently adding 5% (accounting for the mass ratio of lithium salt and organic solvent) of FEC and VC as additives and mixing to obtain electrolyte solvent, adding 10% ( (mass ratio) lit...

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Abstract

The invention, which relates to the technical field of electrochemical energy storage devices, discloses an electrolyte of an aluminum-negative-electrode energy storage device, an aluminum negative energy storage device and a preparation method thereof. The electrolyte comprises lithium salt and an organic solvent; and the organic solvent includes 10 to 20 vol% of a cyclic ester solvent and 80-90vol% of a linear ester solvent. According to the invention, problems that the capacity performance of the battery is affected by the existing electrolyte system in the Al negative electrode system andthe cycle performance of the battery is poor but the system with the good normal-temperature circulation performance has the poor low temperature performance are solved. The low-temperature electrolyte provided by the invention match the Al negative electrode system well; the low viscosity at a low temperature is kept; and thus the system has the high conductivity. Meanwhile, the negative electrode electrolyte has the low solid-liquid interface impedance and thus the lithium ions can be effectively extracted. With the electrolyte, the low-temperature charge and discharge performances of the Al negative-electrode lithium ion energy storage device are improved substantially.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy storage devices, in particular to an electrolyte solution for an aluminum negative electrode energy storage device, an aluminum negative electrode energy storage device and a preparation method thereof. Background technique [0002] Since its commercialization, lithium-ion batteries with outstanding advantages in high energy density, small self-discharge, high output voltage and long cycle life have quickly occupied almost all markets in the field of consumer electronics represented by mobile phones and notebook computers. In the past few years, the application of electric bicycles and power vehicles has also shown geometric growth. However, with the increasing applications and demands, the disadvantages of lithium-ion batteries in low-temperature performance are becoming more and more prominent. The discharge capacity at -30°C and below only accounts for 50-60% of the discharge ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/0566H01M10/0525H01G11/60H01G11/58
CPCH01G11/58H01G11/60H01M10/0525H01M10/0566H01M10/0569Y02E60/10
Inventor 唐永炳徐子俊谢呈德祝佳丽张凡
Owner REAL POWER IND LTD
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