Application of sodium vanadium phosphate material and its low temperature battery
A technology of vanadium lithium sodium phosphate and phase vanadium lithium sodium phosphate, applied in rhombohedral phase lithium vanadium sodium phosphate materials and its low-temperature battery field, can solve practical application inconvenience, difficult use, external circuit and battery management system complexity, etc. question
Active Publication Date: 2020-10-30
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
Monoclinic phase Li 3 V 2 (PO 4 ) 3 When used as a cathode material for low-temperature lithium-ion batteries, its typical multi-step Li + The embedding and ejection features complicate the external circuit and the battery management system (BMS), which brings inconvenience to the practical application; besides, the large voltage difference between the voltage platforms makes the capacity from the low potential in the full battery system hard to really take advantage of
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Embodiment 9
[0048] Li in Example 9 1.3 Na 1.7 V 2 (PO 4 ) 3 , whose cell parameters are α=β=90°, γ=120°.
Embodiment 15
[0049] Li in Example 15 0.1 Na 2.9 V 2 (PO 4 ) 3 , whose cell parameters are α=β=90°, γ=120°.
[0050] The surfaces of the positive electrode active materials in Examples 2, 3, 5, and 6 respectively have conductive coating layers of amorphous carbon, carbon fibers, carbon nanotubes, and graphene.
[0051] The positive electrode active materials in Examples 10, 13, and 15 were compositely modified with metal Ni, metal Al, and metal Ti, respectively.
[0052] In actual engineering practice, the conductive coating layer on the surface of the positive electrode active material is not limited to amorphous carbon, carbon fiber, carbon nanotube and graphene, it can also be graphitized carbon and redox graphite according to actual needs. alkene.
[0053] In the above embodiments, the negative electrode active material used in the negative electrode of the low-temperature lithium-ion battery is not specifically shown. In actual engineering practice, the negative electrode active ...
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The invention discloses an application of a sodium lithium vanadium phosphate material in a low temperature lithium ion battery, and the low temperature lithium ion battery, and relates to the field of lithium ion batteries. The rhombohedral phase sodium lithium vanadium phosphate material Li3-xNaxV2(PO4)3 (x is more than 0 and less than 3) is applied to the positive electrode of the low temperature lithium ion battery as a positive electrode active material, and the rhombohedral phase sodium lithium vanadium phosphate material is selected from a pure rhombohedral phase sodium lithium vanadiumphosphate material, a mixed material of rhombohedral phase lithium vanadium phosphate and rhombohedral phase sodium vanadium phosphate, and a mixed material of rhombohedral phase lithium vanadium phosphate, rhombohedral phase sodium vanadium phosphate and a small amount of monoclinic phase lithium vanadium phosphate. The rhombohedral phase sodium lithium vanadium phosphate material can effectively simplify an external circuit and improve the electrochemical performances of the low temperature lithium ion battery as the positive electrode active material of the low temperature lithium ion battery.
Description
technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically relates to the application of a rhombohedral vanadium lithium sodium phosphate material and a low-temperature battery thereof. Background technique [0002] Lithium-ion batteries have already occupied a major position in the consumer electronics market, and are gradually entering the field of hybrid electric vehicles / electric vehicles. The rapid promotion of new energy electric vehicles poses greater challenges to the existing lithium-ion battery system. Among them, the polyanionic compound LiFePO 4 Because of its advantages of high structural stability, long cycle life and environmental friendliness, it is widely used in the field of power batteries, but its low temperature performance is very poor. battery life of electric vehicles. [0003] It has been reported that the root cause of the energy and power loss of batteries at low temperatures lies in the slow kinetic...
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IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 李会巧秦瑞环薛澜澜翟天佑
Owner HUAZHONG UNIV OF SCI & TECH