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Lithium ion battery electrolyte and lithium ion battery thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as expensive additives, and achieve the effects of easy cost, cost control, and good cycle performance

Inactive Publication Date: 2021-03-02
SHENZHEN GPC ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used lithium-ion battery electrolyte additives vary in the type and amount of additives used according to different needs. Of course, the price of additives is also quite expensive, so it is necessary to choose the best

Method used

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  • Lithium ion battery electrolyte and lithium ion battery thereof

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Embodiment Construction

[0015] In order to make the present invention clear and understandable, the present invention will be further described below through specific embodiments and comparative examples:

[0016] 1. Preparation of electrolyte:

[0017] In a glove box filled with argon (moisture content 6 , lithium dioxalate borate LiBOB, vinylene carbonate VC, and 1,3-propane sultone PS are mixed according to 85.6%: 11.0%: 0.4%: 1.0%: 2.0%, so that the total amount of organic solvent, lithium salt, The sum of the proportions of vinyl ester and 1,3-propane sultone components is 100%, and the molar concentration of lithium salt is 0.9 mol / L to obtain the lithium ion battery electrolyte in Example 1.

[0018] The electrolyte preparation method of Examples 2-6 is the same as that of Example 1, the difference is that the specific proportions of the components in the electrolyte are different.

[0019] 2. Preparation of positive electrode sheet:

[0020] The active material nickel cobalt lithium mangane...

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Abstract

The invention discloses a lithium ion battery electrolyte and a lithium ion battery thereof. The electrolyte is composed of an organic solvent, a lithium salt, a film-forming additive and a high temperature additive, the sum of percentages of the components is 100%, and the organic solvent is a ternary system of EC: EMC: DEC being 35: 30: 35, and has high ionic conductivity. The (11.40-12.50%) lithium salt is LiPF6 or LiPF6 mixed with (0-0.4%) LiBOB, so that the requirement of the lithium ion battery on 0.5 C circulation for 400 weeks can be met, and the cost can be controlled. The film-forming additive VC is helpful for forming a good SEI film, and the multiplying power, storage, low-temperature discharge and high-temperature discharge performances of the battery are improved. The high-temperature additive PS can effectively improve the high-temperature storage performance of the battery. The obtained lithium ion battery is good in safety performance, the capacity retention ratio canreach 400 weeks and is larger than 80% after 0.5 C circulation, and batch production is easy.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery electrolyte and the lithium ion battery. Background technique [0002] Electrolyte is an important factor affecting the performance of lithium-ion batteries. Electrolyte is known as the "blood" of lithium-ion batteries, and it plays the role of conducting ions between the positive and negative electrodes in lithium-ion batteries. The organic solvent of the electrolyte is generally mixed with a high dielectric constant solvent and a low viscosity solvent. Commonly used organic solvents are binary or ternary, such as ethylene carbonate + dimethyl carbonate, ethylene carbonate + diethyl carbonate, Ethylene carbonate + dimethyl carbonate + ethyl methyl carbonate, ethylene carbonate + ethyl methyl carbonate + diethyl carbonate, etc. are often determined according to the conditions of use. Generally, the safety performance of the ternary ...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0567H01M10/0563
CPCH01M10/0563H01M10/0567H01M10/0569H01M2300/004H01M2300/0091Y02E60/10
Inventor 李露黄小李国敏
Owner SHENZHEN GPC ENERGY GRP CO LTD
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