A lithium ion battery and an electrolyte thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries and their electrolytes, can solve the problems of decreased storage performance and aggravated oxidation and decomposition of lithium-ion batteries, so as to reduce possibility, reduce gas production, and improve high-temperature storage performance Effect

Active Publication Date: 2019-04-05
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is accompanied by intensified oxidative decomposition between the positive electrode and the electrolyte, which leads to a decline in the storage performance of lithium-ion batteries under high temperature conditions.

Method used

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  • A lithium ion battery and an electrolyte thereof
  • A lithium ion battery and an electrolyte thereof
  • A lithium ion battery and an electrolyte thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Positive electrode preparation: the positive electrode active material LiNi 0.8 co 0.1 mn 0.1 o 2 (lithium nickel cobalt manganese) and conductive agent acetylene black (SuperP) are evenly mixed, then add N-methylpyrrolidone (NMP) binder polyvinylidene fluoride glue (PVDF) into the mixing tank and stir until uniform , wherein the mass ratio of positive electrode active material, conductive agent, and binder is (93:4:3). The obtained slurry is coated on an aluminum foil, baked, rolled, and cut into pieces to obtain a positive electrode sheet.

[0023] Negative electrode preparation: After mixing the negative electrode active material graphite and the conductive agent SuperP evenly, add the binder SBR and deionized water into the mixing tank, and stir until it is uniform. The ratio of the active material, the conductive agent and the binder is (91:3:6). The obtained slurry is coated on a copper foil, baked, rolled, and cut into pieces to obtain a negative electrode s...

Embodiment 2

[0027] Adopt the method for embodiment 1 to prepare positive pole piece;

[0028] Adopt the method for embodiment 1 to prepare negative pole sheet;

[0029] The electrolyte was prepared by the method of Example 1, except that the first additive was to replace the phosphorothioate tris(methyl isocyanate) in Example 1 with 1% mass fraction of phosphorothioate tris(ethyl isocyanate);

[0030] The battery was prepared by the method of Example 1.

Embodiment 3

[0032] Adopt the method for embodiment 1 to prepare positive pole piece;

[0033] Adopt the method for embodiment 1 to prepare negative pole sheet;

[0034] The electrolyte was prepared by the method of Example 1, except that the first additive was to replace the tris(methyl isocyanate) of phosphorothioate in Example 1 with 1% mass fraction of phosphorothioate tris(propyl isocyanate);

[0035] The battery was prepared by the method of Example 1.

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Abstract

The invention discloses a lithium ion battery and an electrolyte thereof. The lithium ion battery comprises a nonaqueous solvent, lithium salt, a first additive and a second additive, wherein R1, R2 and R3 contained in the first additive are C1-C5 alkyl and / or phenyl groups; X is an oxygen atom or a sulfur atom; and n in the second additive is an integer of 0-4. According to the invention, the synergistic action of the first additive and the second additive is used to form a dense protective film on a positive electrode to prevent the contact between the positive electrode and the electrolyteunder a high temperature or a high voltage and reduce the possibility of oxidation of the electrolyte, thereby improving the temperature storage performance of the battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to lithium ion batteries and electrolytes thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, long life, and fast charging speed, so they have been widely used in electronic products. However, with the development of national policies, lithium-ion batteries are required to have higher energy density. Among ternary materials, increasing the nickel content of the positive electrode and increasing the voltage are very effective ways to increase its energy density. However, it is accompanied by intensified oxidative decomposition between the positive electrode and the electrolyte, which leads to a decrease in the storage performance of lithium-ion batteries under high temperature conditions. Contents of the invention [0003] The main purpose of the present invention is to provide a lithium-ion battery with excellent high-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 罗世康吕国显王振东褚春波张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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