High-temperature electrolyte and lithium ion battery

A technology of electrolyte and high-temperature additives, which is applied in the field of lithium-ion batteries, can solve problems such as leakage and fire, affecting battery performance, and battery disconnection and opening, so as to reduce the generation of HF, improve cycle performance, and optimize stability.

Pending Publication Date: 2017-10-10
OPTIMUM BATTERY CO LTD
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Problems solved by technology

The electrolyte is mainly composed of lithium salts, organic solvents and functional additives, commonly used lithium salts include LiPF 6 , which has high room temperature conductivity, good electrochemical stability (no corrosion to the current collector), and excellent properties such as being easily soluble in carbonate organic solvents, but LiPF 6 Unstable and easy to decompose at high temperature and sensitive to trace water to form PF 5 , HF and LiF
HF causes ac

Method used

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  • High-temperature electrolyte and lithium ion battery
  • High-temperature electrolyte and lithium ion battery
  • High-temperature electrolyte and lithium ion battery

Examples

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Example Embodiment

[0036] Example

[0037] In a specific embodiment, the electrolyte is composed of 15% LiPF 6 , 25% ethylene carbonate, 50% ethyl methyl carbonate, 6% propylene carbonate, 2% vinylene carbonate, 1% propane sultone and 1% tris(pentafluorophenyl) Borane composition. Furthermore, a positive electrode sheet, a negative electrode sheet and a separator are used to assemble the battery cell and the electrolyte is injected to prepare a 5.0 Ah lithium ion battery. Wherein, the positive electrode sheet includes a positive electrode active material coating composed of lithium iron phosphate, a conductive agent and a binder; the negative electrode sheet includes a negative electrode active material coating composed of graphite, a binder and a conductive agent.

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Abstract

The invention provides a high-temperature electrolyte and a lithium ion battery comprising the same. A borate or borane high-temperature agent which is added into the electrolyte can be used for preventing decomposition of LiPF6, reducing reaction of PF5 and a solvent, reducing generation of CO, Co2 and hydrocarbon gas and reducing excessive consumption of the electrolyte and can also be used for capturing F and reducing generation of HF, so that the stability of a positive active material and an SEI membrane are optimized, and the cycle property of the lithium ion battery is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-temperature electrolyte and a lithium ion battery using the electrolyte. 【Background technique】 [0002] The electrolyte used as an ion transporter between the positive and negative electrodes of lithium-ion batteries needs to have high electrical conductivity, wide electrochemical window and high thermal stability. The electrolyte is mainly composed of lithium salts, organic solvents and functional additives, commonly used lithium salts include LiPF 6 , which has high room temperature conductivity, good electrochemical stability (no corrosion to the current collector), and excellent properties such as being easily soluble in carbonate organic solvents, but LiPF 6 Unstable and easy to decompose at high temperature and sensitive to trace water to form PF 5 , HF and LiF. HF causes the dissolution of active materials and the instability of the SEI film, res...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 张礼芳李磊王海涛许辉
Owner OPTIMUM BATTERY CO LTD
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