High-voltage ternary positive electrode material system lithium ion battery electrolyte compatible with high/low-temperature performance
A lithium-ion battery and cathode material technology, applied in the field of high-voltage lithium-ion batteries, can solve the problems of cycle performance, high-temperature performance and low-temperature performance that cannot be taken into account at the same time, and achieve the effect of excellent cycle performance
Active Publication Date: 2017-09-22
ZHANJIANG JUXIN NEW ENERGY
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Problems solved by technology
[0004] In order to solve the deficiencies in the prior art, the object of the present invention is to provide a high-voltage ternary positive electrode material system lithium ion battery electrolyte with both high and low temperature performance, which can effectively improve the ternary positive electrode material battery at the same time. The cycle performance, high-temperature storage performance, low-temperature discharge performance and safety performance under the voltage (4.3-4.5V) condition have well solved the cycle performance, high-temperature performance and high-temperature performance of the lithium-ion battery electrolyte in the high-voltage ternary cathode material system in the prior art. The problem that the low temperature performance cannot be taken into account at the same time
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Embodiment 1
[0026] Electrolyte preparation:
[0027] Ethylene carbonate, ethyl methyl carbonate and diethyl carbonate were mixed and added to 1mol / L lithium hexafluorophosphate (LiPF 6 ), and the electrolyte solution was obtained after uniform mixing. Then add 1% of vinylene carbonate, 1% of 1,3-propane sultone, and 0.5% of succinonitrile film-forming agent based on the mass of the electrolyte, and mix evenly. Finally, add 1,2,3-trifluorobenzene, 2,4,5-trifluorobenzonitrile, LiPF 2 C 2 o 4 and LiPO 2 f 2 The additive is the electrolyte; the specific percentages of each component in the additive are shown in Table 1.
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The invention discloses a lithium ion battery electrolyte. The electrolyte comprises a non-aqueous organic solvent, a lithium salt, a film formation agent and additives, wherein four additives of fluorobenzonitrile, fluorobenzene, an oxalic acid and phosphoric acid lithium salt and a fluorotrioxophosphate lithium salt are simultaneously added into the lithium ion battery electrolyte, a synergistic effect will be generated by simultaneously using the additives, so that the ternary positive electrode material has advantages of excellent cycle property, high-temperature storage performance, low-temperature discharge performance, safety and the like under a high-voltage (4.3-4.5V) condition, and the problem that the cycle property, the high-temperature performance and the low-temperature performance of a high-voltage ternary battery electrolyte in the prior art cannot be simultaneously compatible is solved very well.
Description
technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery electrolyte of a high-voltage ternary positive electrode material system with both high and low-temperature performance and a high-voltage lithium-ion battery containing the electrolyte. Background technique [0002] Due to the advantages of high energy density, environmental friendliness, and long cycle life, high-voltage ternary cathode material lithium-ion batteries are widely used in portable electronic devices such as mobile phones and notebook computers, and are also considered to be the first choice for electric vehicles and large-scale energy storage devices. One of the best options. At present, power tools, electric vehicles, and large-scale energy storage devices have higher and higher energy density requirements for batteries, making it difficult for commercial ternary cathode material lithium-ion batteries (working voltage 4.2V) to ...
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Login to View More IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 谢青松田红梁光照
Owner ZHANJIANG JUXIN NEW ENERGY