High-voltage additive and high-voltage electrolyte for lithium battery
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A high-voltage, electrolyte technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of battery performance degradation and affecting the performance of lithium batteries
Active Publication Date: 2020-05-08
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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Problems solved by technology
[0003] However, when studying high-voltage lithium batteries, it was found that as the voltage of lithium batteries increased, the performance of the batteries deteriorated significantly.
The main reason is that when the voltage of the lithium battery increases, the positive electrode material will react with the electrolyte in the battery, affecting the performance of the lithium battery
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Embodiment 1
[0023] Embodiment 1: the preparation of lithium battery
[0024] (1) Select lithium cobalt oxide suitable for high voltage as the positive electrode material, and the positive electrode material LiCoO 2 , CNTs, and PVDF are mixed evenly according to the ratio of 98:1:1, coated on the aluminum foil current collector, dried in an oven, rolled on a roller press, and the compacted density is 4.1g / cm 3 , to obtain the desired positive electrode sheet.
[0025] (2) Choose artificial graphite as the negative electrode material, mix graphite, CMC, conductive agent, and binder according to the ratio of 95:1.2:1.8:2, and prepare the negative electrode sheet. The compacted density of the electrode sheet is 1.7g / cm 3 .
[0026] (3) The ceramic-coated PE film is selected as the separator (9+3) um, and the pole piece is made into a 1Ah small soft-pack battery by lamination method, which is used for the test of high-voltage electrolyte.
Embodiment 2
[0027] Embodiment 2: Lithium battery performance test
[0028] The charging and discharging voltage window of the lithium battery is 2.8-4.5V; the cycle test of the battery is room temperature 25°C and high temperature 45°C, and the cycle charge and discharge current is 0.5C; the high temperature storage performance test is 60°C, 100% SOC storage for 7 days , The charge and discharge current is 0.5C.
Embodiment 3
[0030] In an argon atmosphere, the environmental index is H 2 O≤0.5ppm, O 2 In a glove box of ≤2.0ppm, mix the organic solvents EC, FEC, and DEC according to the mass ratio EC / FEC / DEC=25 / 5 / 70, then add lithium hexafluorophosphate to dissolve, and prepare an electrolyte with a lithium hexafluorophosphate concentration of 1M, and then press The mass fractions are 1%, 0.7%, and 1%, adding auxiliary additives VC, LiPO 2 f 2 and PS, and then add 1% of high-voltage additive A to prepare electrolyte I.
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Abstract
The invention provides a high-voltage additive and a high-voltage electrolyte for a lithium battery. The high-voltage additive is a compound containing cyclic enamine and a thiophosphonate structure;the structural formula I is shown in the specification, wherein R1 and R2 are respectively one of an alkyl group with 1-8 carbon atoms, a halogenated alkyl group, an alkenyl group with 2-8 carbon atoms, a halogenated alkenyl group, an alkynyl group with 2-8 carbon atoms, a halogenated alkynyl group, an aryl group with 6-8 carbon atoms or a halogenated aryl group. According to the high-voltage additive, a stable and compact CEI film can be formed on a positive electrode, transition metal ions on the surface of a positive electrode material are stabilized, oxygen precipitation of the positive electrode material is inhibited, and oxygenolysis of an electrolyte is reduced; and a film can be formed on the negative electrode, so that the stability of a negative electrode SEI film is improved, and the performance of the lithium battery under a high-voltage condition is improved.
Description
technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a high-voltage additive and a high-voltage electrolyte for lithium batteries. Background technique [0002] Since its commercialization in the 1990s, lithium batteries have been widely used due to their high energy density, high charge-discharge efficiency, low self-discharge, long service life, and environmental friendliness. At present, it has been applied to the fields of consumer electronics, aerospace, military, electric tools and electric vehicles. With the development of technology, whether it is in the field of consumption or in the field of power batteries, people have higher and higher requirements for the endurance of lithium-ion batteries, and the development of lithium batteries with high energy density (mass energy density and volume energy density) has become the key. The development of high-energy-density lithium batteries can be charged in ...
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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525Y02E60/10
Inventor 高田慧李立飞黄建张振宇
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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