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A lithium ion battery having good cyclic effects and an electrolyte thereof

A technology of lithium-ion batteries and cycle effects, applied in the field of lithium-ion batteries and their electrolytes, to achieve the effects of low toxicity and side effects, low cost, and improved storage stability

Active Publication Date: 2017-10-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no electrolyte additive that can effectively take into account the characteristics of the positive and negative electrode materials, effectively inhibit the dissolution of metal ions in the positive electrode material, and form a stable SEI film on the surface of the negative electrode material. Therefore, it is necessary to further optimize the electrolyte solvent or additive. The composition of the formula improves the stability of the positive and negative electrode materials, and realizes the improvement of the comprehensive performance of the lithium-ion battery, especially the high-specific energy lithium-ion battery system, especially the cycle performance

Method used

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  • A lithium ion battery having good cyclic effects and an electrolyte thereof
  • A lithium ion battery having good cyclic effects and an electrolyte thereof
  • A lithium ion battery having good cyclic effects and an electrolyte thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Preparation of Electrolyte 1 and Experimental Battery 1

[0049] (1) Preparation of Electrolyte 1

[0050] In an argon glove box with moisture content ≤ 10ppm, mix ethylene carbonate (EC) and ethyl methyl carbonate (EMC) uniformly according to the mass ratio EC:EMC=3:7, then slowly add lithium salt, namely lithium hexafluorophosphate, and wait After the lithium salt is completely dissolved, add propyl isocyanate triethoxysilane with a mass fraction of 0.5% and vinylene carbonate with a mass fraction of 1%, and stir evenly to obtain electrolyte 1, wherein lithium hexafluorophosphate accounts for the mass of the entire electrolyte The concentration is 14%.

[0051] (2) Preparation of positive electrode sheet

[0052] Mix the positive electrode active material silicon-based negative electrode material, conductive agent acetylene black, and binder polytetrafluoroethylene according to the mass ratio NMC811: acetylene black: polytetrafluoroethylene = 95: 2.5: 2.5, add N-met...

Embodiment 2

[0058] Electrolyte 2 and experimental battery 2 were prepared.

[0059] The difference from Example 1 is that in the preparation process of the electrolyte, 1% propyl isocyanate trimethoxysilane and 1% vinylene carbonate are added after the lithium salt is completely dissolved.

Embodiment 3

[0061] Electrolyte 3 and experimental battery 3 were prepared.

[0062] The difference from Example 1 is that in the electrolyte preparation process, 3% propyl isocyanate triethoxysilane and 1% vinylene carbonate are added after the lithium salt is completely dissolved.

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PUM

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Abstract

A lithium ion battery electrolyte having good cyclic effects is disclosed. The electrolyte includes an organic solvent, a lithium salt and an additive. The additive includes a mono-isocyanate-group alkoxy silane compound and a film forming compound. The invention also discloses a lithium ion battery having good cyclic effects. The isocyanate-group alkoxy silane compound in the electrolyte is cheap, can be easily synthesized, and can be adopted as an effective water removing agent and be synergistic with the film forming compound at the same time. A stable SEI film can be formed on the surface of an electrode material, structure stability of cathode and anode materials in a charge-discharge cyclic process is increased, and electrolyte decomposition on electrode surfaces is avoided, and therefore the cyclic performance of the lithium ion battery under room-temperature and high-temperature conditions can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery with good cycle effect and an electrolyte thereof. Background technique [0002] The electrolyte of lithium-ion batteries is mainly composed of lithium salts, organic solvents and various functional additives, which have an important impact on the performance of lithium-ion batteries such as capacity, internal resistance, cycle, rate, and safety. The solvent of the electrolyte is generally formed by a combination of cyclic carbonate solvents such as EC, PC and chain carbonate solvents such as DMC, DEC, EMC, etc., which have good electrochemical stability, high dielectric constant, low It has the characteristics of high melting point, high flash point, safety and non-toxicity. Electrolyte lithium salt LiPF 6 Due to its high solubility in carbonate solvents, high conductivity, and good stability to graphite negative electrodes, it is the main l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 梁大宇包婷婷王涂亮
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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