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Lithium-ion battery electrolyte and lithium-ion battery containing same

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of increasing side reactions between positive electrode materials and electrolytes, deteriorating battery performance at room temperature and low temperature, increasing thermal instability of battery materials, etc., and achieving stable SEI film. Structure, good room temperature and high temperature cycle stability, good room temperature and high temperature cycle stability effect

Inactive Publication Date: 2020-04-17
DONGGUAN SHANSHAN BATTERY MATERIALS +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

An increase in nickel content or an increase in operating voltage will increase the thermal instability of the battery material, and the side reactions between the positive electrode material and the electrolyte will increase, which will easily cause gas production during high-temperature storage or cycle of the battery
[0003] Unsaturated additives are currently a type of additives that have been studied more in terms of inhibiting the increase of gas production, such as 1,3-propene sultone and triallyl phosphate, etc. The introduction of this type of additives significantly improves the high temperature of the battery. Storage performance, but at the same time cause the impedance of the positive and negative electrodes of the battery to increase at the same time, deteriorating the normal and low temperature performance of the battery

Method used

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  • Lithium-ion battery electrolyte and lithium-ion battery containing same
  • Lithium-ion battery electrolyte and lithium-ion battery containing same
  • Lithium-ion battery electrolyte and lithium-ion battery containing same

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Electrolyte preparation: In a glove box filled with argon (moisture <10ppm, oxygen <1ppm), the solvent ethylene carbonate (EC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC) by mass Ratio EC / DEC / EMC=3 / 2 / 5 Mix evenly to obtain a mixed solution, add lithium salt LiPF6 to the obtained mixed solution, stir until it is completely dissolved, then add additive A (a mixture of VC and DTD), additive B1 and additive C1, after stirring evenly, an electrolyte solution for a lithium-ion battery is obtained. Among them, the mass percentage of lithium salt LiPF6 in the electrolyte is 13%, the mass percentage of VC in the electrolyte is 0.5%, the mass percentage of DTD in the electrolyte is 1%, and the mass percentage of B1 in the electrolyte is The mass percentage of C1 in the electrolyte is 0.5%, and the mass percentage of C1 in the electrolyte is 1%. The electrolyte formulation is shown in Table 1.

Embodiment 2-15

[0056] Examples 2-15 are also specific examples of electrolyte preparation. Except for the parameters in Table 1, other parameters and preparation methods are the same as in Example 1. The electrolyte formulation is shown in Table 1.

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Abstract

The invention discloses a lithium-ion battery electrolyte which comprises a lithium salt, an additive and a non-aqueous organic solvent, and the additive comprises the following components in percentage by mass in the lithium-ion battery electrolyte: 1.5-3.0% of a film-forming additive, 0.5-2.0% of a phosphate additive and 0.5-2.0% of a compound with a boron trifluoride alkyl lithium sulfate structure. The invention also provides a lithium-ion battery containing the lithium-ion battery electrolyte. According to the invention, the three additives are organically combined to realize better normal-temperature and high-temperature cycling stability in a high-voltage or high-nickel system, and meanwhile, the impedance of the battery is lower, so that the high-temperature and low-temperature performances can be considered at the same time.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] High-energy-density ternary lithium-ion batteries are currently the main development and application direction for power batteries and energy storage products. At present, on the one hand, increasing the energy density is mainly to increase the proportion of nickel in the positive electrode material or to increase the working upper limit voltage of the positive electrode material. An increase in nickel content or an increase in operating voltage will increase the thermal instability of the battery material, and the side reactions between the positive electrode material and the electrolyte will increase, which will easily cause gas production during high-temperature storage or cycling of the battery. [0003] Unsaturated additives are currently a typ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 朱学全郭力
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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