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Electrolyte, battery containing same, and electric vehicle

An electrolyte and lithium-ion battery technology, applied in the field of lithium-ion batteries and electric vehicles, can solve problems such as poor high-voltage cycle performance, and achieve the effects of improving oxidation decomposition potential, good cycle life and capacity retention rate, and good anti-oxidation performance.

Active Publication Date: 2021-06-18
BYD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the technical problem of poor high-voltage cycle performance of existing ternary batteries

Method used

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  • Electrolyte, battery containing same, and electric vehicle
  • Electrolyte, battery containing same, and electric vehicle
  • Electrolyte, battery containing same, and electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0042] Since the preparation process of the negative electrode sheet, the positive electrode sheet, and the separator are well-known technologies in the art, and the assembly of the battery is also a well-known technology in the art, details will not be repeated here.

[0043] According to the lithium ion battery proposed by the present invention, preferably, the active material of the positive electrode contains the ternary positive electrode material LiNi x co y A 1-x-y o 2 , A is one or more of Mn or Al, 0.33≤x≤0.85, 0.075≤y≤0.33. Preferably, the active material of the positive electrode is a high-voltage positive electrode active material, such as an active material working at a voltage higher than 4.5V. The active material of the positive electrode can be selected from LiNi, for example 0.5 co 0.2 mn 0.3 o 2 , LiNi 0.6 co 0.2 mn 0.2 o 2 , LiNi 0.8 co 0.1 mn 0.1 o 2 , LiNi 0.85 co 0.075 mn 0.075 o 2 , LiNi 0.8 co 0.15 Al 0.05 o 2 One or more of them,...

Embodiment 1

[0052] (1) Preparation of electrolyte:

[0053] 60g ethylene carbonate and 140g diethyl carbonate are mixed into mixed solvent, add 30g in mixed solvent, the LiPF of 1mol / L 6 . Then 2.14 g of electrolyte additive 2,6-dithia-1,3,5,7-tetraazatricyclo[3.3.1.13,7]decane was added thereto, with a mass percentage of 0.09%.

[0054] (2) Preparation of battery:

[0055] Mix 100 parts of graphite material, 1 part of conductive agent super-p, 1.5 parts of thickener sodium carboxymethyl cellulose, and 2.5 parts of styrene-butadiene rubber binder to form a uniform paste, and evenly coat the On the copper foil as the negative electrode current collector, dry it under vacuum at 80° C. for 24 hours to obtain the negative electrode sheet. Using LiNi 0.5 co 0.2 mn 0.3 o 2 As the positive active material, 100 parts of LiNi 0.5 co 0.2 mn 0.3 o 2 Mix with 2 parts of carbon nanotubes, 1 part of conductive agent super-p, and 2 parts of polyvinylidene fluoride to form a uniform paste, and...

Embodiment 2

[0058] The electrolyte was prepared in the same manner as in Example 1, except that the electrolyte additive was 6 g of 2,6-dithia-1,3,5,7-tetraazatricyclo[3.3.1.13,7]decane Alkanes, mass percent 2.5%. The battery preparation and formation process were the same as in Example 1, and a soft pack battery S2 was prepared.

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Abstract

The invention discloses an electrolytic solution, a battery containing the electrolytic solution and an electric vehicle. The electrolytic solution includes lithium salt, an organic solvent and additives containing sulfur and nitrogen heterocyclic rings. The electrolyte solution according to the present invention also has good oxidation resistance at a high voltage higher than 4.5V (for example, 4.95V), and the lithium-ion battery using the electrolyte solution has good high-voltage and high-temperature cycle performance.

Description

technical field [0001] The present invention relates to the technical field of lithium-ion batteries. Specifically, the present invention relates to an electrolyte, and the present invention also relates to a lithium-ion battery and an electric vehicle containing the above-mentioned electrolyte. Background technique [0002] In recent years, with the vigorous development of the new energy vehicle industry, the industry has higher requirements for the capacity, cycle and safety of power batteries. The cruising range of vehicles has become the focus of people's attention. In order to meet people's needs, it is common in this field to use ternary cathode materials with higher specific capacity. [0003] Ternary cathode materials have been widely studied in the industry because of their higher specific capacity (especially when the charge cut-off voltage reaches 4.5V), which can greatly increase the energy density of the battery. However, our conventional electrolyte system com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058
CPCH01M10/0525H01M10/0567H01M10/058H01M2220/20Y02E60/10Y02P70/50
Inventor 钟海敏王圣
Owner BYD CO LTD
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