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Electrolyte composition for a lithium-ion electrochemical element

A composition and electrolyte technology, applied in electrolytes, battery electrodes, organic electrolytes, etc., can solve problems such as battery short-circuit internal resistance

Pending Publication Date: 2020-11-03
SAFT GRP SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such batteries have a limited lifetime when used at temperatures of at least 80°C
Their composition degrades rapidly, causing a short circuit in the battery or an increase in its internal resistance
For example, after about 100 charge / discharge cycles at 85°C, the capacity loss of such a battery may reach 20% of its initial capacity
In addition, these batteries were also found to have a limited lifetime when used at temperatures below -10°C

Method used

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  • Electrolyte composition for a lithium-ion electrochemical element
  • Electrolyte composition for a lithium-ion electrochemical element
  • Electrolyte composition for a lithium-ion electrochemical element

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0156] Preparation of the electrochemical assembly:

[0157] An electrochemical assembly is formed by interposing a separator between at least one negative electrode and at least one positive electrode. Insert the electrochemical assembly into the battery container. The battery container can be in the form of a parallelepiped or a cylinder. In the latter case, the electrochemical assembly is coiled to form a cylindrical electrode assembly.

[0158] Filling of the container:

[0159] The container provided with the electrochemical assembly is filled with the electrolyte composition as described above.

[0160] Batteries according to the invention generally comprise a combination of the following elements:

[0161] a) at least one positive electrode whose active material is a lithium oxide of a transition metal comprising nickel, manganese and cobalt;

[0162] b) at least one negative electrode whose active material is graphite;

[0163] c) an electrolyte composition a...

Embodiment

[0176] A lithium-ion electrochemical cell was fabricated. It includes a negative electrode whose active material is graphite and the active material has the formula LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 positive electrode. The spacers are made of polypropylene. The battery container was filled with electrolytes whose compositions are denoted A to Q. Table 1 below shows the different electrolyte compositions A to Q. For convenience, electrochemical cells will be referred to below with reference to the electrolyte composition contained in the electrochemical cell.

[0177]

[0178] *Electrolyte composition not part of the invention

[0179] **Mass ratio

[0180] ***Compared to organic solvents, LiPF 6 The mass percentage expressed as the sum of the mass of LiFSI (if present)

[0181] Table 1

[0182] a) Combination of LiFSI, vinylene carbonate and ethylene sulfate compared to containing LiPF 6 and as the only addition The effect of the reference composition of vinylene c...

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Abstract

An electrolyte composition for a lithium-ion electrochemical element, comprising: - at least one lithium tetrafluoride or hexafluoride salt, - the salts of lithium bis(fluorosulfonyl)imide LiFSI, - vinylene carbonate, - ethylene sulfate, - at least one organic solvent chosen from the group consisting of cyclic or linear carbonates, cyclic or linear esters, cyclic or linear ethers and a mixture ofsame. The use of this composition in a lithium-ion electrochemical element increases the service life of the element, in particular under low and high temperature cycling conditions.

Description

technical field [0001] The technical field of the invention is that of electrolyte compositions for lithium-ion rechargeable electrochemical cells. Background technique [0002] Lithium-ion rechargeable electrochemical cells are known in the prior art. Due to their high mass and volumetric energy density, they are promising sources of electrical energy. They have at least one positive electrode (which may be a lithiated transition metal oxide) and at least one negative electrode (which may be graphite-based). However, such batteries have a limited lifetime when used at temperatures of at least 80°C. Their components degrade rapidly, leading to a short circuit in the battery or an increase in its internal resistance. For example, after about 100 charge / discharge cycles at 85°C, the capacity loss of such a battery may reach 20% of its initial capacity. Furthermore, these batteries were also found to have a limited lifetime when used at temperatures below -10°C. [0003] A...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525H01M4/505H01M4/525H01M4/58H01M4/587H01M10/0569
CPCH01M4/505H01M4/525H01M4/5825H01M4/587H01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2300/0025Y02E60/10H01M4/133H01M4/583H01M10/44H01M2300/0037
Inventor 朱利安·德莫马莱内·奥斯瓦尔德
Owner SAFT GRP SA