Electrolyte and lithium ion battery

A technology of electrolyte and lithium salt, applied in the field of electrolyte and lithium ion battery, can solve the problems of low impedance and low gas production

Active Publication Date: 2021-09-17
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide an electrolyte and a lithium-ion battery to solve the problem that the lithium-ion battery in the prior art is difficult to have both less gas production and low impedance

Method used

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  • Electrolyte and lithium ion battery
  • Electrolyte and lithium ion battery
  • Electrolyte and lithium ion battery

Examples

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Embodiment 1

[0045] 1) Preparation of lithium-ion battery cathode sheet: the cathode active material LiNi 0.88 co 0.09 mn 0.03 o 2 , conductive carbon, binder polyvinylidene fluoride (PVDF) and N-methylpyrrolidone (NMP) are uniformly mixed to prepare positive electrode slurry. The solid content of the positive electrode slurry is 72wt%, wherein, LiNi 0.88 co 0.09 mn 0.03 o 2 : The mass ratio of conductive carbon: PVDF is 97:2:1. The positive electrode slurry was coated on the aluminum foil of the current collector, dried at 80°C and then cold pressed, and then cut into pieces, and placed in a vacuum oven at 85°C for 12 hours to make a lithium ion battery positive sheet.

[0046] 2) Preparation of lithium-ion battery negative electrode sheet: Negative electrode active material artificial graphite, conductive carbon, thickener carboxymethyl cellulose (CMC), binder styrene-butadiene rubber (SBR) are mixed uniformly in deionized water to make a negative electrode slurry. The solid con...

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Abstract

The invention provides an electrolyte and a lithium ion battery. The electrolyte comprises an organic solvent, a lithium salt and an additive, wherein the additive comprises a carboxylic anhydride derivative with a structure shown in a formula I, R1, R2, R3 and R4 are independently selected from any one of H and trialkyl siloxy, the carbon atom number of each alkyl group in the trialkyl siloxy is 1-10, and at least one of R1, R2, R3 and R4 is the trialkyl siloxy. The anhydride group in the carboxylic anhydride derivative can protect the stability of the electrode structure, thereby inhibiting the gas production of the battery cell. On one hand, trialkyl siloxy can consume a trace amount of water or hydrofluoric acid to form a stable by-product, thereby playing an important role in inhibiting gas production. And the trialkyl siloxy also can reduce the impedance of the passivation film. Therefore, through the synergistic effect of the acid anhydride group and the siloxy group, the effects of the acid anhydride and the siloxane are balanced, so that the lithium ion battery with low gas production and low impedance is obtained.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery. Background technique [0002] At present, the use of new energy to replace traditional fuels has become the trend of the times. Among them, the application of lithium-ion batteries in the field of electric vehicles has attracted the attention of various countries. For example, people put forward higher requirements for the cruising range of electric vehicles, which requires upgrading lithium-ion batteries. energy density, an effective method for this is to increase the specific capacity of the positive and negative electrode materials. [0003] The higher the nickel content in ternary materials (lithium nickel cobalt manganate or lithium nickel cobalt aluminate), the greater the specific capacity of the material. Therefore, the development of high-nickel ternary cathode materials is the current main development direction of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235Y02E60/10
Inventor 吕国显傅佳乐褚春波张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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