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A lithium ion battery electrolyte and a lithium ion battery containing the electrolyte
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A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of high-voltage resistance and poor cycle performance
Active Publication Date: 2018-12-21
BYD CO LTD
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Problems solved by technology
[0005] In order to solve the technical problem of poor high-voltage resistance and cycle performance of the existing lithium-ion battery electrolyte, the invention provides a lithium-ion battery electrolyte with good high-voltage resistance and cycle performance and a lithium-ion battery containing the electrolyte
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Embodiment 1
[0037] 1. Preparation of electrolyte
[0038] Mix FEC and EMC separately in the glove box to obtain a solvent, and then add LiPF 6 and p-trifluoromethylbenzonitrile to obtain electrolyte A1. FEC: EMC=3:7 (V:V), LiPF 6 The concentration is 1mol.L -1 ,
[0041] With 70:15:15 cathode material (LiNi 0.5 mn 1.5 o 4 ), a conductive agent (acetylene black), and a binder (PVDF) to prepare the positive electrode, a lithium sheet as the negative electrode, and the electrolyte as the electrolyte A1, and a Celgard2300 microporous diaphragm was assembled in an argon glove box to form a button battery S1.
Embodiment 2
[0043] 1. Preparation of electrolyte
[0044] Mix FEC and EMC separately in the glove box to obtain a solvent, and then add LiPF 6 and p-trifluoromethylbenzonitrile to obtain electrolyte A2. FEC: EMC=3:7(V:V), LiPF 6 The concentration is 1mol.L -1 ,
[0047] With 80:10:10 cathode material (LiNi 0.5 mn 1.5 o 4 ), a conductive agent (acetylene black), and a binder (PVDF) to prepare the positive electrode, a lithium sheet as the negative electrode, and the electrolyte as the electrolyte A2, and a Celgard2300 microporous diaphragm was assembled in an argon glove box to form a button battery S2.
Embodiment 3
[0049] 1. Preparation of electrolyte
[0050] Mix FEC and EMC separately in the glove box to obtain a solvent, and then add LiPF 6 and p-trifluoromethylbenzonitrile to obtain electrolyte A3. FEC: EMC=3:7(V:V), LiPF 6 The concentration is 1mol.L -1 ,
[0053] With a cathode material of 90:5:5 (LiNi 0.5 mn 1.5 o 4 ), a conductive agent (acetylene black), and a binder (PVDF) to prepare the positive electrode, a lithium sheet as the negative electrode, and the electrolyte as the electrolyte A3, and the Celgard2300 microporous diaphragm was assembled in an argon glove box to form a button battery S3.
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Abstract
The invention provides electrolyte of a lithium-ion battery, and the lithium-ion battery comprising the electrolyte. The electrolyte comprises a lithium salt, a non-aqueous solvent and an additive, wherein the additive is described in the description, R1 is selected from one of -CH2CF3, -CF3, -NO2, -SO3, F and Cl, and R3 is selected from one of F and Cl. The electrolyte can be used for effectively improving the circulatory stability of a secondary lithium battery under high pressure, and increasing the discharging capacity retention ratio in the battery circulation process, so that the service life of the lithium-ion battery is effectively prolonged, and the novel high-energy-density secondary lithium battery is prepared.
Description
technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] Lithium-ion batteries have large capacity, fast charging speed, and long cycle life, and have been widely used in various electronic devices in daily life. In general, a non-aqueous lithium-ion battery includes a lithium anode, a lithium salt dissolved in an organic solvent, and an electrochemically active cathode material. During charging, lithium ions migrate from the positive electrode through the electrolyte to the negative electrode, while they flow in the opposite direction during discharging. A large number of studies have shown that the main reason for shortening the service life of lithium-ion batteries is that the electrodes are prone to react with the electrolyte in a high-temperature and high-pressure environment, resulting in loss of electrode ma...
Claims
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Application Information
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