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Nonaqueous electrolyte solution for lithium iron phosphate lithium-ion battery

A lithium-ion battery, non-aqueous electrolyte technology, applied in the field of chemical materials, can solve the problems of increasing the internal resistance of the battery, affecting the performance of the battery, reducing the cycle efficiency of the battery, etc., and achieving the effect of increasing the cycle life and service life.

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

However, none of the above technologies can obtain a sufficient coating effect relative to the increase in battery characteristics, especially when the metal ions of the positive electrode material dissolved in the electrolyte are reduced on the surface of the negative electrode, it will greatly promote the decomposition of the electrolyte, resulting in battery internal The resistance increases, the battery cycle efficiency decreases, and it will be more prominent at a slightly higher temperature (such as 45-60 degrees), which will seriously affect the battery performance

Method used

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  • Nonaqueous electrolyte solution for lithium iron phosphate lithium-ion battery
  • Nonaqueous electrolyte solution for lithium iron phosphate lithium-ion battery
  • Nonaqueous electrolyte solution for lithium iron phosphate lithium-ion battery

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Embodiment Construction

[0022] The content of the present invention will be further described below in conjunction with specific embodiments.

[0023] The present invention exemplifies the composition of 1 to 74 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 examples are comparative examples without adding component C, the 1st to 50th examples are 500 cycle battery capacity percentages at room temperature, and the 51st to 74th examples are 500 cycles at 60°C. Cycle cycle battery capacity percentage.

[0024] Table 1 Components of non-aqueous electrolyte solution and percentage of battery capacity

[0025]

[0026]

[0027]

[0028]

[0029]

[0030]

[0031] As can be seen from the above examples, the non-aqueous electrolyte solution added with functional additives can reduce the reduced iron ions on the surface ...

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Abstract

The invention discloses a nonaqueous electrolyte solution for a lithium iron phosphate lithium-ion battery. The nonaqueous electrolyte solution comprises 0.001 to 2mol / L of a lithium salt, 0.01 to 20% by mass of functional additives, a carbonic ester and / or ether organic solvent, and 0 to 0.5mol / L of other additives. Through interaction with iron ions dissolved out, the nonaqueous electrolyte solution reduces reduced iron ions on the surface of a cathode, improves a battery cycle life and a battery service life, improves a battery capacity retention rate and a battery cycle life in a high-temperature environment, and can be used for manufacture of a lithium iron phosphate power battery and an energy-storage battery.

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): H01M10/0567H01M10/0568H01M10/0569
CPCY02E60/12Y02E60/10
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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