Non-aqueous electrolyte and lithium-ion battery

A non-aqueous electrolyte, lithium-ion battery technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the degradation of lithium-ion battery rate performance, insufficient high-temperature cycling of lithium-ion batteries, and affect battery power characteristics and other problems, to achieve the effect of favorable ionic conductivity, good film-forming effect, and improved intercalation and extraction ability.

Active Publication Date: 2020-10-09
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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Problems solved by technology

However, the use of positive electrode additives often leads to a decrease in the rate performance of lithium-ion batteries, thereby affecting the power characteristics of the battery, such as common positive electrode film-forming additives vinylene carbonate (VC) and 1,3-propane sultone (1, 3-PS), 1,3-propene sultone (PES) will reduce the power characteristics of the battery
The above-mentioned existing film-forming additives still have the problem of insufficient high-temperature cycle of lithium-ion batteries, and lithium-ion batteries are also easy to swell during high-temperature storage

Method used

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  • Non-aqueous electrolyte and lithium-ion battery

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preparation example Construction

[0060] According to some embodiments of the present invention, the preparation method of the lithium-ion battery electrolyte as described above, the preparation method includes the following steps:

[0061] S1: Add the electrolyte lithium salt into the solvent, stir to completely dissolve the lithium salt, and obtain a lithium salt solution;

[0062] S2: adding functional additives and optionally other additives to the above lithium salt solution, and mixing uniformly to obtain the lithium ion battery electrolyte.

[0063] Preferably, the solvent is purified. The purification refers to the removal of impurities and water from the solvent, preferably through molecular sieves and activated carbon. Described molecular sieve can adopt type, type or type.

[0064] According to some embodiments of the present invention, the dissolution temperature of the electrolyte lithium salt in the organic solvent is 10-20°C.

[0065] The selection and consumption of the electrolyte lit...

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Abstract

The invention provides a non-aqueous electrolyte and a lithium ion battery. The non-aqueous electrolyte comprises a solvent, an electrolyte lithium salt and a functional additive, wherein the functional additive comprises 4,4'-dipinacol borate diphenyl sulfone, dipyridyl carbonate and lithium difluorophosphate. When the electrolyte provided by the invention is applied to a lithium ion battery of ahigh-nickel ternary material / graphite system, the impedance of the lithium ion battery can be remarkably reduced, the power performance of the lithium ion battery can be improved, gas production of the lithium ion battery in circulation and storage processes can be remarkably inhibited, and the rate capability, the normal-temperature cycle performance, the high-temperature cycle performance, thehigh-temperature storage performance and the safety performance of the lithium ion battery are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a non-aqueous electrolyte for lithium-ion batteries of a high-nickel ternary material / graphite system and a lithium-ion battery. Background technique [0002] Lithium-ion batteries (LIBs) have attracted the attention of researchers due to their high energy density, high power density, long cycle life, and no memory effect. Improving the cruising range is a problem worthy of attention, and the solution is mainly to increase the energy density of the battery. However, the cathode material is a key factor for the energy density of LIBs. Currently, Ni-rich oxide (NRO) has become the most promising material for high-energy-density LIBs in order to increase energy density. However, according to a large number of studies by NRO, it is found that its surface chemical properties are unstable, and in the air environment, the particle surface is easily formed by the block Li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 朱辉余意
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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