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Electrolyte, lithium ion battery comprising same and preparation method of lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of lithium-ion battery cycle and storage performance decline, battery power performance decline, battery failure, etc., to suppress battery gas production, improve power performance, and easily effect of operation

Active Publication Date: 2015-11-11
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in order to increase the energy density of lithium-ion batteries, the voltage of lithium-ion batteries has been continuously increased. However, higher voltage means that the cathode material has a higher electrode potential and is more oxidative. Therefore, during the storage and cycle of the battery , will lead to the degradation of the cycle and storage performance of the lithium-ion battery and even lead to the failure of the battery
[0005] In the prior art, the above-mentioned problems are improved through the introduction of cathode additives, a protective layer is formed on the surface active points of the cathode material, and direct contact between the surface active points of the cathode material and the electrolyte is avoided, and the occurrence of side reactions is suppressed. The use will also bring some negative effects, such as the decrease of the power performance of the battery

Method used

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  • Electrolyte, lithium ion battery comprising same and preparation method of lithium ion battery
  • Electrolyte, lithium ion battery comprising same and preparation method of lithium ion battery
  • Electrolyte, lithium ion battery comprising same and preparation method of lithium ion battery

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preparation example Construction

[0074] Another object of the present application is to provide a method for preparing a lithium-ion battery, which includes injecting the electrolyte solution provided by the application, wherein injecting the electrolyte solution includes the following two steps.

[0075] Step (1), after putting the battery cell into the packaging case, inject the electrolyte E1 containing the additive A, and then carry out chemical formation and exhaust.

[0076] In the above step (1), preferably, the content of the additive A is 0.15% to 8% of the total weight of the electrolyte E1 part, and more preferably, the content of the additive A is 0.25% of the total weight of the electrolyte E1 part. ~7.5%, more preferably, the content of the additive A is 0.35~5% of the total weight of the electrolyte E1 part.

[0077] In the above step (1), the electrolyte solution E1 containing part of lithium salt, part of organic solvent and additive A is injected. Preferably, the content of the part of the ...

Embodiment

[0086] The present application is further described below through specific examples. However, these examples are merely exemplary and do not constitute any limitation to the protection scope of the present application.

[0087] In the following examples, comparative examples and test examples, the reagents, materials and instruments used are commercially available unless otherwise specified.

[0088] In the following experimental examples, comparative examples and test examples, the materials used are as follows:

[0089] Organic solvent: The organic solvent is a mixture containing ethylene carbonate (abbreviated as EC), ethyl methyl carbonate (abbreviated as EMC) and diethyl carbonate (abbreviated as DEC). The weight ratio is EC:EMC:DEC=1:1:1.

[0090] Additive: vinylene carbonate (VC), the total content of VC is 0.2% of the total weight of the electrolytic solution.

[0091] Lithium salt: LiPF 6 , LiPF 6 The total content is 12.5% ​​of the total weight of the electrolyte....

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Abstract

The invention relates to an electrolyte, a lithium ion battery comprising the same and a preparation method of the lithium ion battery. The electrolyte comprises a lithium salt, an organic solvent, an addition agent A and an addition agent B. The addition agent A is one or more of phosphate ester compounds and boric acid ester compounds. The addition agent B is one or more of sulfurous ester compounds and sultone compounds. The electrolyte is applied in the lithium ion battery, and then the cycling performance, the high-temperature storage performance and the power performance of the lithium ion battery can be improved. When the lithium ion battery is prepared, some electrolyte E1 is added before being formed, and the rest of the electrolyte E2 is added before the capacity is tested. By selecting the preparation method, the lithium ion battery can have the excellent cycling performance, high-temperature storage performance and power performance.

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, in particular to an electrolyte, a lithium-ion battery including the electrolyte, and a method for preparing the lithium-ion battery. Background technique [0002] With the depletion of fossil energy and the increasing pressure of environmental pollution, the automotive industry urgently needs a new type of energy to drive it. Lithium-ion batteries stand out due to their high energy density, no memory effect, and high operating voltage. It is currently the preferred solution for new energy vehicles. The automotive industry requires power lithium-ion batteries to have the following properties: high power performance, long cycle life, and long storage life. However, this is a big challenge for traditional lithium-ion batteries. [0003] Generally speaking, a more stable solid electrolyte interface (Solid Electrolyte Interface, SEI) film can provide better protection for the anode an...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/058C07F7/08C07F9/17C07D327/10C07D327/04
CPCC07D327/04C07D327/10C07F7/08C07F9/17H01M10/0525H01M10/0567H01M10/058Y02E60/10Y02P70/50
Inventor 周晓崇韩昌隆付成华冯绍伟田少杰
Owner NINGDE AMPEREX TECH
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