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

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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