Contemporary Amperex Technology Co., Ltd.

Xiaomei Wang

Changlong Han

Chenghua Fu

Jianwei Zhu

Jiqiong Liu

Yan Zhou

Feng Huan

Kun Yu

Bin Jiang

Wenhao Liu

Feng Xu

The present disclosure relates to the technical field of lithium-ion battery, and particularly, to an electrolytic solution and a lithium-ion battery including the electrolytic solution. The electrolytic solution includes additives, and the additives include an additive A and an additive B. The additive A forms a film on the surface of the positive electrode and effectively prevents interface side reactions at the positive electrode. Comparing with the additive A, the additive B is preferentially reduced to form a film at the negative electrode, avoiding an increase in impedance and deterioration of cycling dynamic performance, etc., caused by film formation of the additive A on the negative electrode. The combination of the additive A and additive B imparts the battery with a reduced gas production, a higher capacity retention rate and a lower impedance at high temperature.

Electrolytic solution and lithium-ion battery

The present invention discloses a Lithium ion battery and an electrolyte thereof, the electrolyte comprising an organic solvent, a lithium salt and an additive. The additive comprises a cyclic fluoro carbonate (A), a cyclic phosphazene (B), a cyclic sulfate and a lithium fluoro oxalate borate (D). The lithium fluoro oxalate borate (D) has following formula:  Compared with the prior art, the electrolyte of the present invention may form a stable CEI and SEI film on the surface of positive and negative electrodes, protect the interface between positive and negative electrodes, improve the acidic atmosphere of Lithium ion battery electrolyte, and reduce the damage effect of HF on the interface between positive and negative electrodes, while reducing low temperature resistance of lithium-ion battery, improving cycle life, high temperature storage performance, safety performance and rate capability of lithium-ion battery.

Lithium-ion battery and its electrolyte

The present disclosure provides an electrolyte and an electrochemical energy storage device, the electrolyte comprises an electrolyte salt and an additive. The additive comprises a sulfonic ester cyclic quaternary ammonium salt and a multinitrile compound. The sulfonic ester cyclic quaternary ammonium salt and the multinitrile compound can form a dense and uniform passive film with high ionic conductivity on a surface of each of the positive electrode film and the negative electrode film, so as to prevent continuous oxidation and reduction reaction from occurring between the electrolyte and the positive electrode film and the negative electrode film and make the electrochemical energy storage device has excellent high temperature cycle performance and high temperature storage performance.

Electrolyte and electrochemical energy storage device

The present invention discloses a Lithium ion battery and an electrolyte thereof, the electrolyte comprising an organic solvent, a lithium salt and an additive. The additive comprises additive (A) cyclic fluoro carbonate, additive (B) cyclic phosphazene (B), and additive (C) cyclic sulfate. The additive B cyclic phosphazene has the following general structural formula:  Compared with the prior art, the electrolyte of the present invention may form a stable CEI and SEI film on the surface of positive and negative electrodes, protect the interface between positive and negative electrodes, improve the acidic atmosphere of Lithium ion battery electrolyte, and reduce the damage effect of HF on the interface between positive and negative electrodes, thereby improving cycle life, high temperature storage performance, and safety performance of lithium-ion battery.

The present disclosure provides an electrolyte and an electrochemical energy storage device. The electrolyte comprises an electrolyte salt and an additive. The additive comprises a sulfonic ester cyclic quaternary ammonium salt and a fluorocarbon surfactant. Under the combined effect of the sulfonic ester cyclic quaternary ammonium salt and the fluorocarbon surfactant, a dense, uniform and stable passive film can form on a surface of each of a positive electrode film and a negative electrode film of the electrochemical energy storage device, and infiltration capability of the electrolyte on each of the passive film of the positive electrode film and the negative electrode film can be increased at the same time, so as to decrease electrode polarization inside the electrochemical energy storage device and make the electrochemical energy storage device have excellent rate capability, low temperature discharge performance and high temperature storage performance.

The present disclosure provides an electrolyte and an electrochemical energy storage device. The electrolyte comprises an electrolyte salt and an additive. The additive comprises a sulfonic ester cyclic quaternary ammonium salt and a dioxide heterocyclic compound. Under the combined effect of the sulfonic ester cyclic quaternary ammonium salt and the dioxide heterocyclic compound, a dense, uniform and stable passive film on a surface of each of the positive electrode film and the negative electrode film of the electrochemical energy storage device, thereby reducing the contact between the positive, negative electrode active materials and the electrolyte, thus avoiding the occurrence of continuous oxidation and reduction reaction of the electrolyte on the surface of each of the positive electrode film and the negative electrode film, so as to make the electrochemical energy storage device has excellent high temperature storage performance and high temperature cycle performance.

Growing community of inventors

Ningde, China

Xiaomei Wang