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A long cycle energy storage lithium battery

A lithium battery, long-cycle technology, applied in the manufacture of battery electrodes, secondary batteries, electrolyte batteries, etc., can solve the problems of lithium battery overcharge or overdischarge, electrolyte leakage, battery short circuit, etc., to avoid overcharge or battery short circuit. Effects of over-discharge, avoiding the precipitation of metal lithium dendrites, improving cycle life and safety

Active Publication Date: 2021-06-29
江苏海四达电源有限公司
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AI Technical Summary

Problems solved by technology

However, the charging and discharging platform of the existing lithium iron phosphate-graphite energy storage battery is relatively flat. During the charging and discharging process of the battery, overcharging or overdischarging of the lithium battery is prone to occur, thereby producing dendrites of lithium metal, and dendrites of lithium metal It is easy to pierce the diaphragm of the lithium battery, resulting in leakage of the electrolyte, short circuit inside the battery, and also affects the normal operation of the negative electrode of the lithium battery, thereby affecting the cycle stability and safety of the lithium battery

Method used

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  • A long cycle energy storage lithium battery
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preparation example Construction

[0020] In order to further improve the capacity and cycle performance of the lithium vanadium phosphate, under preferred conditions, the preparation method of the lithium vanadium phosphate includes: combining a lithium phosphorus source and a vanadate in a reducing atmosphere at 600-800°C Roasting 5 ~ 18h.

[0021] Under preferred conditions, the reducing atmosphere is a mixed gas of an inert gas and a reducing gas. Further preferably, the reducing gas is hydrogen; the inert gas is nitrogen or argon, and further preferably, the reducing gas accounts for 5% to 15% by volume of the volume of the mixed gas, for example, it can be 8% by volume , 10% by volume, and 12% by volume.

[0022] Further preferably, the calcination temperature is 650-750°C (for example, 650°C, 680°C, 700°C, 720°C or 750°C), and the calcination time is 7-16h (for example, it can be 7h, 10h , 12h, 15h or 16h).

[0023] Preferably, the lithium phosphorus source is selected from at least one of lithium hyd...

Embodiment 1

[0036] (1) Preparation of lithium vanadium phosphate: LiH 2 PO 4 and NH 4 VO 3 After mixing evenly according to the molar ratio of 1:1.1, place in N 2 and H 2 In an atmosphere (the volume of hydrogen accounts for 6% by volume of the total volume ratio of the mixed gas), followed by roasting at 780° C. for 7 hours to prepare lithium vanadium phosphate with a monoclinic structure;

[0037] The particle size distribution D50 of the lithium vanadium phosphate is about 0.9 μm, and there is a charging and discharging voltage plateau between 3.0V and 4.1V.

[0038] (2) Preparation of positive electrode:

[0039] The positive active material contains 90 wt% of lithium iron phosphate and 10 wt% of the aforementioned lithium vanadium phosphate.

[0040] The particle size D50 of the lithium iron phosphate is about 1.1 μm.

[0041] Weigh the positive electrode active material, KS, graphene and PVDF according to the weight ratio of 92:3:3:2, then mix the above positive electrode act...

Embodiment 2

[0049] (1) Preparation of lithium vanadium phosphate: LiH 2 PO 4 and NH 4 VO 3 After mixing evenly according to the molar ratio of 1:1, place in N 2 and H 2 In an atmosphere (the volume ratio of hydrogen to the total volume of the mixed gas is 10% by volume), followed by roasting at 700° C. for 10 h to prepare lithium vanadium phosphate with a monoclinic structure;

[0050] The particle size distribution D50 of the lithium vanadium phosphate is about 0.5 μm, and there is a charging and discharging voltage plateau between 3.0V and 4.1V.

[0051] (2) Preparation of positive electrode:

[0052] The positive electrode active material contained 85 wt% of lithium iron phosphate and 15 wt% of the aforementioned lithium vanadium phosphate.

[0053] The particle size D50 of the lithium iron phosphate is about 1.1 μm.

[0054] Weigh the positive electrode active material, KS, graphene and PVDF according to the weight ratio of 92.5:3.6:2:1.9, then mix the above positive electrode ...

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a long-cycle energy storage lithium battery. The long-cycle energy storage lithium battery includes a positive electrode, a negative electrode, an electrolyte, and a separator. The positive electrode includes: a positive electrode active material, a positive electrode conductive agent, a positive electrode binder, and a positive electrode current collector; the positive electrode active material includes: 80~ 90wt% lithium iron phosphate and 10-20wt% lithium vanadium phosphate; wherein, the particle size distribution D50 of the lithium iron phosphate is 0.5-1.8 μm; the particle size distribution D50 of the lithium vanadium phosphate is 0.2-1.0 μm. The present invention can adjust the discharge voltage platform of the lithium battery by compounding lithium iron phosphate and lithium vanadium phosphate, thereby increasing the change value of different voltages due to the state of charge SOC, and controlling the cycle of the battery at different discharge depths DOD by controlling the voltage performance, avoiding the precipitation of metallic lithium dendrites caused by overcharging and overdischarging of the battery, thereby improving the cycle life and safety of the lithium battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a long-cycle energy storage lithium battery. Background technique [0002] Lithium-ion battery is the most important technology applied in the newly-commissioned electrochemical energy storage projects in the world in 2016, reaching 541.6MW, accounting for 85%; while almost all the newly-commissioned electrochemical energy storage projects in China use lithium-ion batteries and lead-acid batteries, lithium-ion batteries and lead-acid batteries accounted for 62% and 37% of newly installed capacity respectively. And LG Chem, Samsung SDI, BYD and Kokam and other major manufacturers of energy storage products mainly use lithium-ion battery technology. [0003] At present, industrialized lithium batteries are mainly lithium iron phosphate-graphite energy storage batteries, that is, lithium iron phosphate is used as the positive electrode active material of lithium batteries...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525H01M10/058
CPCH01M4/362H01M4/5825H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 沈晓彦葛国杰王兴威卢晓能刘吟秋胡丹丹娄文涛
Owner 江苏海四达电源有限公司
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