Nonaqueous electrolyte solution for improving lithium ion battery cycling stability

A non-aqueous electrolyte, cycle stability technology, applied in the field of chemical materials, can solve problems affecting battery performance, increase interface impedance, film composition and property changes, etc., to improve capacity retention and cycle life, increase cycle life and use The effect of improving the service life and capacity maintenance rate

Inactive Publication Date: 2013-03-20
轻工业化学电源研究所 +1
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Problems solved by technology

However, in the above-mentioned technologies, it is impossible to obtain a sufficient film effect relative to the increase in battery characteristics. First, the surface film deteriorates and the function decreases when it is used repeatedly; Different degrees of decomposition occur, leading to irreversible changes in the composition and properties of the coating, which seriously affects battery per

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  • Nonaqueous electrolyte solution for improving lithium ion battery cycling stability
  • Nonaqueous electrolyte solution for improving lithium ion battery cycling stability
  • Nonaqueous electrolyte solution for improving lithium ion battery cycling stability

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Embodiment Construction

[0015] The technical solution of the present invention will be described in detail below in conjunction with the embodiments.

[0016] The present invention lists the composition of 1 to 47 kinds of non-aqueous electrolyte solutions and the test data of the capacity retention rate of the battery using each electrolyte solution in the form of a table, see Table 1 below for details. Among them, the first 10 embodiments are comparative examples without adding component B; the 1st to 33rd embodiments are 500 cycle battery capacity percentages at normal temperature, and the 34th to 47th embodiments are 500 cycles at 60°C. Cycle cycle battery capacity percentage.

[0017] Table 1 Components of non-aqueous electrolyte solution and percentage of battery capacity

[0018]

[0019]

[0020]

[0021]

[0022] It can be seen from the above examples that by using the above-mentioned non-aqueous electrolyte solution containing 2,3-cycloethane-1,4-butyrolactone, the capacity ret...

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Abstract

The invention discloses a nonaqueous electrolyte solution for improving lithium ion battery cycling stability. The nonaqueous electrolyte solution comprises 0.001 to 2mol/L of a lithium salt, 0.01 to 10% by mass of 2,3-cyclohexane-1,4-butyrolactone, a carbonic ester and/or ether organic solvent, and 0 to 0.5mol/L of other functional additives. The nonaqueous electrolyte solution can inhibit the decomposition of a lithium ion battery electrolyte on the surface of a battery material, protect anode and cathode materials, improve a cycle life and a service life of a lithium battery, inhibit battery resistance improvement, improve a battery capacity retention rate, and improve a battery capacity retention rate and a battery cycle life in normal-temperature and high-temperature environments.

Description

technical field [0001] The invention relates to a nonaqueous electrolyte solution, which belongs to the technical field of chemical materials. Background technique [0002] At present, commercial lithium battery electrolyte solutions are mainly composed of organic carbonates such as dimethyl carbonate (DMC for short), diethyl carbonate (DEC for short), ethylene carbonate (EC for short), etc., and conductive lithium salts (mainly LiPF 6 )composition. The optimization and selection of organic carbonate non-aqueous electrolyte solutions is one of the important research directions to improve the comprehensive performance of lithium-ion batteries. Non-aqueous electrolyte solutions used in lithium-ion batteries should generally meet the following requirements: (1) high ion conductivity, generally should reach 10 -3 S / cm; (2) high lithium ion migration number to obtain high lithium ion conductivity; (3) wide electrochemical window, that is, to meet the reversible intercalation an...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0566H01M10/0569
CPCY02E60/122Y02E60/10
Inventor 李立飞郑军伟袁翔云袁杰张少杰陈世彬沈蕾方剑慧
Owner 轻工业化学电源研究所
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