High-voltage lithium ion battery

A lithium-ion battery, high-voltage technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high-voltage oxidation and decomposition of high-voltage cathode materials, such as structural damage, to improve high-voltage cycle performance, ensure stability, and contact interface quality. improved effect

Pending Publication Date: 2021-01-05
XIAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this high-voltage electrolyte that only uses additives only achieves certain performance improvements in certain aspects, and cannot completely solve the problems of high-pressure oxidation decomposition of carbonate-based electrolytes and structural damage of high-voltage cathode materials.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0058] Spinel LiNi 0.5 mn 1.5 o 4 with NH 4 F was mixed by ball milling and heat-treated at 450 °C for 5 h to prepare high-pressure fluorinated cathode materials. After the material is uniformly mixed with conductive agent SP and binder PVDF in NMP solvent, it is coated on the surface of aluminum foil to prepare a high-voltage fluorinated positive electrode sheet.

[0059] After mixing the artificial graphite, the conductive agent SP, and the binder CMC+SBR in a deionized water solvent, they are coated on the surface of copper foil to prepare a carbonaceous negative electrode sheet.

[0060] lithium salt LiPF 6 Dissolve in a mixed solvent composed of 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether and EC, EMC (volume ratio 2:4:4), and add a mass ratio of 2% FEC and 1% lithium difluorooxalate borate to prepare a fluorinated electrolyte.

[0061] In a glove box filled with argon gas, the high-pressure fluorinated positive electrode, polyolefin separator and carbon...

Embodiment 2

[0063] Spinel LiNi 0.5 mn 1.5 o 4 Access to F 2 In the atmosphere, the high-pressure fluorinated cathode material was prepared after being kept at room temperature for 2 hours. After the material is uniformly mixed with conductive agent SP and binder PVDF in NMP solvent, it is coated on the surface of aluminum foil to prepare a high-voltage fluorinated positive electrode sheet.

[0064] lithium salt LiPF 6 Dissolve in a mixed solvent composed of 1,3-bis(1,1,2,2-tetrafluoroethoxy)propane, EC and DMC (volume ratio 1:1:1), and add a mass ratio of 5% Ethyl-(2,2,2-trifluoroethyl)carbonate and 0.5% tris(trimethylsilyl)borate to prepare a fluorinated electrolyte.

[0065] The carbonaceous negative electrode and the button lithium ion battery are made with the same embodiment 1.

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Abstract

The invention discloses a high-voltage lithium ion battery, which comprises a positive electrode, a negative electrode and an electrolyte, wherein the positive electrode is a high-voltage fluorinatedpositive electrode, the negative electrode is a carbonaceous negative electrode, and the electrolyte uses fluorinated ether as a cosolvent and uses fluorinated carbonate and a boron-containing substance as additives. According to the battery disclosed in the invention, the oxidation resistance of the positive electrode material and the electrolyte can be improved, and the high-voltage stability ofan interface constructed by the positive electrode, the negative electrode and the electrolyte can be ensured, so that the key problem of the lithium ion battery under a high-voltage working condition is effectively solved, and the high-voltage cycle performance of the lithium ion battery is integrally improved.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a high-voltage lithium-ion battery. Background technique [0002] The development of lithium-ion batteries with high energy density has become a research hotspot at home and abroad. Increasing the working voltage is an effective way to increase the energy density of lithium-ion batteries. Various high-voltage cathode materials have received extensive research and attention in recent years, but they have not been applied on a large scale. The existing problems can be attributed to the following two points: [0003] 1) The lattice structure of the positive electrode material is not stable under high pressure conditions, especially under the attack of trace water or HF in the electrolyte, the Mn 2+ The representative transition metal ions are easy to escape from the positive electrode and dissolve, resulting in the loss of active materials and the destruction of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131H01M4/133H01M4/136H01M10/0567H01M10/0525
CPCH01M4/62H01M4/628H01M4/131H01M4/136H01M4/133H01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 卢海何龙杜慧玲郑斌郑学召刘长春
Owner XIAN UNIV OF SCI & TECH
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