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Electrolyte and lithium-ion battery

A technology of electrolyte and lithium salt, applied in the field of electrolyte and lithium ion battery, can solve the problems of bad influence on the interface stability of positive and negative electrodes, failure of lithium ion battery, increase of electrode surface impedance, etc., to improve power performance and lithium evolution. conditions, improving the cycle performance at room temperature and high temperature, and reducing the effect of DCR

Active Publication Date: 2020-06-12
NINGDE AMPEREX TECH
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Problems solved by technology

The use of high-performance electrode materials such as high-nickel ternary materials (NCM, NCA), high-voltage positive electrode active materials, and silicon-carbon composite materials is currently an effective way to increase the energy density of lithium-ion batteries. The stability of the positive and negative interface has adverse effects
Nickel metal ions have high catalytic activity for the oxidation reaction of the electrolyte. Under high voltage, the electrolyte is unstable at the positive electrode interface. The volume expansion effect of the silicon-carbon negative electrode causes the SEI film to continuously rupture and recombine. Decomposition, the surface impedance of the electrode continues to increase, and the active lithium is continuously consumed, resulting in the final failure of the lithium-ion battery

Method used

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  • Electrolyte and lithium-ion battery
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  • Electrolyte and lithium-ion battery

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preparation example Construction

[0043] (1) Preparation of electrolyte

[0044] Ethylene carbonate (EC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) are mixed with mass ratio EC:EMC:DEC=30:50:20, as non-aqueous organic solvent, to non-aqueous organic solvent After adding additives to the non-aqueous organic solvent after mixing evenly, the concentration of lithium salt is 1.1mol / L, which is the electrolyte solution.

[0045] In Examples 1-18 and Comparative Examples 1-6, the additives used and their addition amounts are shown in Table 1, wherein the addition amount of each additive in Table 1 is calculated based on the total mass of the electrolyte mass percentage.

[0046] The parameters of the electrolyte of table 1 embodiment 1-18 and comparative example 1-6

[0047]

[0048]

[0049] Note: "-" indicates that no substance is added.

[0050] (2) Preparation of positive electrode sheet:

[0051] The cathode active material LiNi 0.8 co 0.15 Al 0.05 o 2 , conductive agent Super P, an...

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Abstract

The invention provides an electrolyte and a lithium ion battery. The electrode comprises an organic solvent, a lithium salt and an additive, wherein the additive comprises a dinitrile compound with an ether bond and a fluorine-substituted borate compound. After the electrolyte is applied to the lithium ion battery, the DC internal resistance of the lithium ion battery can be effectively reduced, the power performance and the lithium precipitation of the lithium ion battery are improved, and the normal-temperature and high-temperature cycle properties of the lithium ion battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices due to their high energy density, high operating voltage, long cycle life, environmental friendliness, and no memory effect. With the rapid development of the power cell and energy storage power supply market, the requirements for the energy density, power performance, and cycle life of lithium-ion batteries are getting higher and higher. [0003] During the charge and discharge process, interfacial reactions will occur between the positive electrode active material and the negative electrode active material and the electrolyte, and a CEI film and an SEI film will be formed on the positive and negative electrode interfaces respectively. very important. The use of high-performance electrode materials such as high-nickel ternar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 周艳张明付成华陈培培唐超
Owner NINGDE AMPEREX TECH
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