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Lithium ion battery

A technology of lithium-ion batteries and lithium salts, applied in battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of battery energy density, safety, cost, etc., and achieve excellent anti-overcharge performance and thermal stability. Stability, improved safety performance, fast charge and discharge effects

Inactive Publication Date: 2015-02-18
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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AI Technical Summary

Problems solved by technology

At the same time, traditional lithium-ion battery cathode materials such as lithium cobaltate, lithium manganate, ternary materials, and lithium iron phosphate cannot meet the requirements of battery energy density, safety, and cost in the field of new energy to a large extent.

Method used

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Embodiment Construction

[0015] The lithium ion battery of the present invention includes a positive electrode, a negative electrode, and an electrolyte, the electrolyte includes a lithium salt and a solvent, and is characterized in that the active material of the positive electrode is a lithium-rich manganese-based solid solution;

[0016] The active material of the negative electrode is lithium titanate;

[0017] Described solvent comprises fluorocarbonate and comprises one or more in fluoromethyl sulfolane or derivatives thereof, fluoromethyl vinyl sulfite or derivatives thereof, fluoromethyl vinyl sulfate or derivatives thereof kinds of additives;

[0018] The general formula of the lithium-rich manganese-based solid solution is xLi2MnO3·(1-x)LiMO2, wherein 1.2<x<1.5, M=Ni, Co, Mn, Cr, Ni0.5Mn0.5, Ni1 / 3Mn1 / 3Co1 / 3 any of the.

[0019] The lithium salt is one or more of LiPF6, LiBF4, LiClO4, LiAsF6, LiBOB, LiCF3SO3.

[0020] xLi2MnO3·(1-x)LiMO2 of the present invention, wherein 1.6

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Abstract

The invention discloses a lithium ion battery which comprises a positive electrode, a negative electrode and an electrolyte. The electrolyte comprises lithium salt and a solvent. The lithium ion battery is characterized in that an active material of the positive electrode is lithium-rich manganese-based solid solution; an active material of the negative electrode is lithium titanate; and the solvent contains fluorocarbonic ester and contains one or more additives selected from fluoromethyl sulfolane or its derivative, fluoromethyl glycol sulfite or its derivative and fluoromethyl ethylene sulfate or its derivative. A general formula of the lithium-rich manganese-based solid solution is xLi2MnO3.(1-x)LiMO2, wherein x is less than 1.8 and greater than 1.6; M is any one selected from Ni, Co, Mn, Cr, Ni0.5Mn0.5 and Ni1 / 3Mn1 / 3Co1 / 3. The lithium salt is one or more selected from LiPF6, LiBF4, LiClO4, LiAsF6, LiBOB and LiCF3SO3. Reversible capacity is greater than 250 mAh / g. Energy density is greater than that of other traditional cathode materials, and high-temperature performance is excellent.

Description

technical field [0001] One aspect of the present invention relates to the field of batteries, in particular to a lithium ion battery and a preparation method thereof. Background technique [0002] Energy and the environment are two major issues facing mankind in the 21st century. In my country, with the acceleration of industrialization and urbanization, the demand for oil continues to increase, and the supply of oil in my country is in short supply, so the dependence on foreign countries continues to increase. As more and more oil and coal are mined and burned, and greenhouse gases such as CO2 in the atmosphere continue to increase, China will face increasing pressure to reduce carbon emissions. The promotion of new energy vehicles and the development and utilization of new energy are strategic measures for the country to build an energy-saving society and reduce dependence on traditional energy sources. It is an inevitable choice for economic transformation under the pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/505H01M4/485H01M10/0567H01M10/0569
CPCH01M4/485H01M4/505H01M4/525H01M10/0567H01M10/0569H01M10/058Y02E60/10
Inventor 孙琦李岩孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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