Shenzhen Capchem Technology Co., Ltd.

Jiaojiao Yun

Qiao Shi

Shiguang Hu

Muchong Lin

Xionggui Lin

Chang'an Zeng

Li Wei Wang

Qun Chen

Dejun Xiong

Zhou He

Provided is a non-aqueous electrolyte, comprising a solvent, a lithium salt, an additive A and an additive B, the additive A is selected from compound represented by structural formula 1, and the additive B is selected from one or more of compounds represented by structural formula 2 and structural formula 3:

Non-aqueous electrolyte and lithium ion battery

The application provides a non-aqueous electrolyte for lithium ion battery. The non-aqueous electrolyte for lithium ion battery comprises a compound A represented by formula I and a compound B represented by formula II, In formula I, R, Rand Rare independently selected from C1-C5 alkyl or haloalkyl, C2-C5 unsaturated hydrocarbon group or unsaturated halohydrocarbon group, and at least one of R, Rand Ris the unsaturated hydrocarbon group or unsaturated halohydrocarbon group; In formula II, R, R, R, R, Rand Rare each independently selected from one of hydrogen atom, fluorine atom and C1-C5 group. The non-aqueous electrolyte for lithium ion battery provided by the application enables the battery to have excellent cycle performance and high-temperature storage performance through the synergistic effect of the compound A and the compound B.

Non-aqueous electrolyte for lithium ion battery and lithium ion battery

A non-aqueous electrolyte for a lithium-ion battery and a lithium-ion battery. The non-aqueous electrolyte includes an unsaturated phosphate compound and a cyclic unsaturated carboxylic anhydride compound. The unsaturated phosphate compound has a structure represented by structural formula (4). R, Rand Rare each independently selected from a hydrocarbon group having 1 to 5 carbon atoms, and at least one of R, Rand Ris an unsaturated hydrocarbon group having a double bond or a triple bond. The unsaturated cyclic carboxylic anhydride compound having a structure represented by Structural Formula 5. Ris selected from the group consisting of an alkenylene group having 2 to 4 carbon atoms or a fluorinated alkenylene group having 2 to 4 carbon atoms. By means of the synergistic effect of two compounds, the non-aqueous electrolyte has excellent high-temperature cycling performance and storage performance, and also has lower impedance and good low-temperature performance.

Non-aqueous electrolyte for lithium-ion battery and lithium-ion battery

A non-aqueous electrolyte for a lithium-ion battery and a lithium-ion battery. The non-aqueous electrolyte comprises unsaturated phosphate compounds and unsaturated cyclic carboxylic acid anhydride compounds. The unsaturated phosphate compounds have the structure illustrated in structural formula 4; structural formula 4: R, R, and Rare independently selected from hydrocarbon groups having 1-5 carbon atoms respectively, and at least one of R, R, and Ris an unsaturated hydrocarbon group containing double bonds or triple bonds; the unsaturated cyclic carboxylic acid anhydride compounds have the structure illustrated in structural formula 5; structural formula 5: Ris independently selected from vinylidene having 2-4 carbon atoms or fluoro-substituted vinylidene. By means of the synergistic effect of two compounds, the non-aqueous electrolyte has excellent high-temperature cycling performance and storage performance, and also has lower impedance and good low-temperature performance. 

A lithium-ion battery non-aqueous electrolyte and a lithium-ion battery. The non-aqueous electrolyte comprises at least one selected from the compounds represented by structural formula I and II; in formula I, R1 and R2 are independently selected from alkenyl having 2-5 carbon atoms and alkynyl having 2-5 carbon atoms; in formula II, R3 is selected from alkenyl having 2-5 carbon atoms and alkynyl having 2-5 carbon atoms. The compound represented by formula I or II is added in the electrolyte; the compound contains unsaturated bond(s) and hexafluorisopropyl; the unsaturated bond(s) form passivation film on cathode and anode surfaces to inhibit decomposition of the electrolyte on the cathode & anode surface and damage of the cathode material structure; moreover, the polymerization degree of unsaturated bond(s) can be inhibited to some extent due to steric hindrance relationship of fluoroisopropyl functional groups, so as to improve high-temperature performance of the lithium-ion battery while guaranteeing low-temperature performance.

Non-aqueous electrolyte of lithium-ion battery and lithium-ion battery

A lithium-ion battery, comprising a cathode, an anode, and a non-aqueous electrolyte; the cathode comprises a cathode active material and a metal oxide and/or metal fluoride coating which covers the surface of the cathode active material; the cathode active material is at least one of materials illustrated in general formula I or II: formula I: LiNiMO, wherein 0.5&#x2264;x&#x2264;1.2, 0.5&#x2264;y&#x2264;1, and M is selected from at least one of Co, Mn, Al, Ti, Fe, Zn, Zr, Cr, and formula II: LiCoLO, wherein 0.5&#x2264;k&#x2264;1.2, 0.5&#x3c;z&#x2264;1, and L is selected from at least one of Ni, Mn, Al, Ti, Fe, Zn, Zr, Cr. According to the lithium-ion battery, the charge cut-off voltage of the lithium-ion battery reaches 4.3 V or more by means of a synergistic effect of the unsaturated phosphate compounds and the coating at the surface of the cathode active material.

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Jiaojiao Yun