公开(公告)号：US20170025706A1

公开(公告)日：2017-01-26

申请号：US15300872

申请日：2015-04-01

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Jeffrey R. Dahn ,  Jian Xia ,  Yaohui Wang ,  Remi Petibon ,  Lin Ma ,  Kathlyne Nelson ,  Laura E. Downie

IPC: H01M10/0567 ,  H01M10/0525

CPC classification number: H01M10/0567 ,  H01M10/0525 ,  H01M2300/0025

Abstract: Improved nonaqueous electrolytes have been developed for lithium ion batteries. The electrolytes comprises a lithium salt, a nonaqueous carbonate solvent, and an additive mixture comprising at least one group A compound, at least one group B compound, and at least one group C compound wherein the group A compound is selected from the group consisting of VC and PES, the group B compound is selected from the group consisting of MMDS, DTD, TMS, ES, and PS, and the group C compound is selected from the group consisting of TTSP and TTSPi. Certain ternary or quaternary additive mixtures can: reduce parasitic reactions at the positive electrode above 4.1 V compared to use of VC alone; increase the thermal stability of a charged graphite electrode at elevated temperature; improve coulombic efficiency; and also reduce impedance of the batteries. These factors all suggest longer lived, safer, higher power lithium batteries with better tolerance to high voltages which will improve energy density.

Abstract translation: 锂离子电池已经开发出改进的非水电解质。 电解质包括锂盐，非水性碳酸酯溶剂和包含至少一种A组化合物，至少一种B组化合物和至少一种C组化合物的添加剂混合物，其中A组化合物选自 VC和PES，组B化合物选自MMDS，DTD，TMS，ES和PS，C组化合物选自TTSP和TTSPi。 某些三元或四元添加剂混合物可以：与单独使用VC相比，降低正电极4.1 V以下的寄生反应; 提高带电石墨电极在高温下的热稳定性; 提高库仑效率; 并降低电池的阻抗。 这些因素都表明更长寿命，更安全，更高功率的锂电池，对高电压具有更好的耐受性，这将提高能量密度。