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Electrolyte additive, electrolyte containing additive, and lithium battery using electrolyte

An electrolyte additive and electrolyte technology, which can be used in secondary batteries, circuits, electrical components, etc., and can solve problems such as difficulty in applying battery systems and low stability of interfacial films

Active Publication Date: 2021-05-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the film formation mechanism, the interfacial film formed by the former has low stability and is easily affected by working conditions such as temperature and volume deformation of the electrode material; the oxidation potential of the latter is relatively close to the decomposition potential of the polymer, so it is difficult to apply high at 4.5V (vs.Li / Li + ) battery system

Method used

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  • Electrolyte additive, electrolyte containing additive, and lithium battery using electrolyte
  • Electrolyte additive, electrolyte containing additive, and lithium battery using electrolyte
  • Electrolyte additive, electrolyte containing additive, and lithium battery using electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Embodiment 1 Electrolyte 1 # preparation of

[0073] In a glove box filled with high-purity argon, measure EC, DMC and EMC; among them, the volume ratio meets EC:DMC:EMC=1:1:1, after mixing evenly, add lithium salt LiPF respectively 6 , additives fluoroethylene carbonate (FEC) and isophorone diisocyanate (IPDI), mix well and set aside, recorded as electrolyte 1 # .

[0074] Electrolyte 1 # Medium, LiPF 6 The concentration is 1mol / L, the mass percentage of fluoroethylene carbonate is 5wt%, and the mass percentage of isophorone diisocyanate (IPDI) is 1wt%.

Embodiment 2

[0075] Embodiment 2 Electrolyte 2 # preparation of

[0076] In a glove box filled with high-purity argon, measure EC, DMC and EMC; among them, the volume ratio meets EC:DMC:EMC=1:1:1, after mixing evenly, add lithium salt LiPF respectively 6 , additives fluoroethylene carbonate (FEC) and isophorone diisocyanate (IPDI), mix well and set aside, record as electrolyte 2 # .

[0077] Electrolyte 2 # Medium, LiPF 6 The concentration is 1mol / L, the mass percentage of fluoroethylene carbonate (FEC) is 1 wt%, and the mass percentage of isophorone diisocyanate (IPDI) is 1 wt%.

Embodiment 3

[0078] Embodiment 3 Electrolyte 3 # preparation of

[0079] In a glove box filled with high-purity argon, measure a certain amount of commercial electrolyte LB30110 (Zhangjiagang Guotai Huarong), add fluoroethylene carbonate (FEC) and isophorone diisocyanate (IPDI) as additives, and mix well Reserve, recorded as electrolyte 3 # .

[0080] Electrolyte 3 # Among them, the mass percentage of fluoroethylene carbonate (FEC) is 5 wt%, and the mass percentage of isophorone diisocyanate (IPDI) is 1 wt%.

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Abstract

The application discloses an electrolyte additive, an electrolyte containing the additive and a lithium battery using the electrolyte. The additives include halogen-substituted cyclic carbonates and cycloalkyl diisocyanates, and the electrolytic solution prepared therefrom also includes electrolytes and solvents. The electrolyte is suitable for charging potential not lower than 4.5V (vs. Li / Li + ) lithium-ion battery can form a layer of high-voltage-resistant interface film in situ on the surface of the positive electrode material, and this film can effectively improve the high-potential cycle performance of the lithium-ion battery.

Description

technical field [0001] The application relates to an electrolyte additive, an additive-containing electrolyte and a lithium battery using the electrolyte, belonging to the technical field of secondary lithium ion battery energy storage. Background technique [0002] Lithium-ion batteries have the characteristics of high operating voltage, high energy density, long cycle life, no memory effect and environmental friendliness, and are currently the most promising secondary battery energy storage methods. However, the energy density of existing lithium-ion batteries is far lower than that of commonly used fossil fuels, making it difficult to meet the needs of social and technological development. One of the most convenient countermeasures is to increase the operating voltage of Li-ion batteries. A variety of high potential cathode materials have been developed, such as LiNi 0.5 mn 1.5 o 4 (plateau~4.75Vvs Li / Li + ), LiNiPO 4 (~5.1V vs Li / Li + ), LiCoPO 4 (~4.8V vs Li / Li ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/0566H01M10/0567
CPCH01M10/0525H01M10/0566H01M10/0567Y02E60/10
Inventor 秦银平刘杨孙担担方燕群王德宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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