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

A lithium-ion battery, non-aqueous electrolyte technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of high temperature cycle and insufficient storage performance

Active Publication Date: 2018-11-20
SANMING HEXAFLUO CHEM CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of high-temperature cycle and insufficient storage performance of existing nickel-cobalt-manganese ternary lithium-ion batteries, the invention provides a non-aqueous electrolyte for lithium-ion batteries and a lithium-ion battery to improve the performance of nickel-cobalt-manganese ternary lithium-ion batteries. High-temperature cycle performance and high-temperature storage performance under high pressure

Method used

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

Examples

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Embodiment 1

[0058] This embodiment is used to illustrate the lithium-ion battery non-aqueous electrolyte, lithium-ion battery and preparation method thereof disclosed in the present invention, comprising the following steps:

[0059] Preparation of non-aqueous electrolyte: Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) in a mass ratio of EC:DEC:EMC=1:1:1, then add Lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1 mol / L, and based on the total weight of the non-aqueous electrolytic solution as 100%, add components containing mass percentages shown in Table 1.

[0060] Preparation of the positive plate: mix the positive active material lithium nickel cobalt manganese oxide LiNi according to the mass ratio of 93:4:3 0.5 co 0.2 mn 0.3 o 2 , conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then the mixture was dispersed in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry. The slurry is e...

Embodiment 2～22

[0066] Embodiments 2 to 22 are used to illustrate the lithium ion battery non-aqueous electrolyte, lithium ion battery and preparation method thereof disclosed in the present invention, including most of the operating steps in Example 1, the difference being:

[0067] In the preparation step of described non-aqueous electrolytic solution:

[0068] Based on the total mass of the non-aqueous electrolyte as 100%, the non-aqueous electrolyte is added with the components shown in the mass percentages of Examples 2 to 22 in Table 1.

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Abstract

In order to solve the problem of insufficient high-temperature cycle property and storage performance of a traditional Ni-Co-Mn ternary lithium ion battery, the invention provides a non-aqueous electrolyte of a lithium ion battery. The non-aqueous electrolyte comprises a solvent, a lithium salt and a compound, wherein the compound is shown in a structural formula 1 and / or a structural formula 2 which is shown in the specification, in the structural formal 1 and / or the structural formula 2, R1 and R2 are independently selected from substituted or non-substituted organic group with 1-5 carbon atmos. Similarly, the invention also discloses the lithium ion battery comprising the non-aqueous electrolyte of the lithium ion battery. With the non-aqueous electrolyte provided by the invention, thehigh-temperature cycle property and the high-temperature storage performance of the Ni-Co-Mn ternary lithium ion battery under high pressure can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery non-aqueous electrolyte and a lithium ion battery. Background technique [0002] Nickel-cobalt-manganese ternary batteries have become a research hotspot for many power battery companies due to their high energy density. In order to further increase the energy density of nickel-cobalt-manganese ternary batteries, thereby increasing the cruising range of electric vehicles, a simple method is to increase the voltage of the battery from 4.2V to 4.3V or even 4.4V. Although increasing the voltage of the nickel-cobalt-manganese ternary battery can increase the energy density of the battery, it also causes the electrolyte to be more easily oxidized on the surface of the ternary nickel-cobalt-manganese positive electrode material, which leads to battery damage during cycling and high-temperature storage. The rapid increase in impedance and...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525C07D291/04
CPCC07D291/04H01M10/0525H01M10/0567H01M10/0568Y02E60/10
Inventor 熊得军胡时光石桥
Owner SANMING HEXAFLUO CHEM CO LTD
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