A lithium-ion battery with thermodynamic protection
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A lithium-ion battery and thermal protection agent technology, applied in the field of lithium-ion batteries, can solve the problems of reducing heat release, not effectively reducing, and unable to effectively inhibit deoxidation, and achieve the effect of preventing thermal runaway and improving solubility
Active Publication Date: 2017-11-24
CHINA FIRST AUTOMOBILE
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[0003] In the known literature and patents, most of the positive electrode materials of lithium batteries are surface modified to improve safety, such as using metal oxides or metal fluorides to coat LiMO 2 (M stands for transition metal) surface, this method can improve the structural stability of the material, reduce the heat release between the material and the electrolyte, and achieve the purpose of safety improvement. However, the protection formed by introducing metal oxide or metal fluoride on the surface of the electrode material The film itself does not have a thermal actuation safety mechanism, and it cannot effectively inhibit the deoxidation phenomenon. Its internal short circuit caused by external environmental factors, such as accidental puncture or external impact damage, causes instantaneous high heat and causes the risk of battery explosion. not effectively reduced
[0004] Patent CN 101807724 provides a lithium battery with thermodynamic protection. The battery uses bismaleimide oligomer as a thermodynamic protection agent to improve the safety of the battery, but obviously, the thermodynamic protection used in this system Preservatives cannot be applied to electrolyte
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[0032] Electrolyte: 1M LiPF 6 , solvent EC / DMC / EMC (v / v / v=1 / 1 / 1), add additive A with a content of 0.1%, R in A 1 , R 2 is phenyl (-C 6 h 5 ).
[0033] Battery type: soft pack battery, 6Ah.
[0034] The puncture test was done simultaneously with the comparative example, and the comparative example caught fire, while the embodiment 2 did not catch fire.
[0039] Electrolyte: 1M LiPF 6 , solvent EC / DMC / EMC (v / v / v=1 / 1 / 1), add additive B with a content of 0.1%, R in B 1 , R 2 is phenyl (-C 6 h 5 ).
[0040] Battery type: soft pack battery, 8Ah.
[0041] The puncture test was done simultaneously with the comparative example, the comparative example caught fire, but the embodiment 3 did not catch fire.
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Abstract
The invention relates to a lithium ion battery with a thermodynamic protection effect. The lithium ion battery is characterized in that an electrolyte solution of the lithium ion battery contains a thermodynamic protective agent; and when the battery is heated to a certain temperature, the thermodynamic protective agent performs a cross-linking reaction to prevent thermal runaway. Bismaleimide adopted by the battery has -OR1 and -OR2 groups, so that the solubility of bismaleimide is improved and bismaleimide can be applied to the electrolyte solution without influencing battery performance; and the safety performance of the battery is enhanced, and a manufacturing method is also relatively simple.
Description
technical field [0001] The invention relates to a lithium-ion battery with thermal protection, in particular to a high-safety secondary lithium-ion battery with a thermal safety mechanism and a manufacturing method thereof, belonging to the secondary lithium-ion battery. Background technique [0002] Lithium-ion batteries have been widely used in 3C products such as computers, communications and consumer electronics, and are also being used in the fields of electric vehicles and large-scale energy storage. However, due to the high-voltage resistant organic electrolyte solvent used in lithium-ion battery systems It has strong flammability, and the positive / negative active material with high capacity will decompose and release a lot of heat when the temperature rises, so that the heat generated by the lithium battery may ignite the organic solvent when it is used improperly. danger, even fire and explosion; in addition, during the charging and discharging process of lithium-io...
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