Electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve problems such as inability to effectively release lithium supplementary capacity and high decomposition potential of lithium-containing compounds
CN112397786AActive Publication Date: 2021-02-23SONGSHAN LAKE MATERIALS LAB +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SONGSHAN LAKE MATERIALS LAB
Publication Date
2021-02-23

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Abstract

The invention provides an electrolyte and a lithium ion battery, and belongs to the technical field of batteries. The electrolyte comprises an organic solvent and a lithium salt dissolved in the organic solvent, and also comprises an auxiliary agent. The auxiliary agent is selected from one or more of S elementary substance, B elementary substance, P elementary substance and a reducing compound capable of releasing specific negative ions in the electrolyte, and the specific negative ions are selected from one or more of S negative ions, B negative ions and P negative ions. The lithium ion battery comprises the electrolyte. The specific type of auxiliary agent can effectively reduce the potential when a lithium-containing compound is decomposed; and by adding the auxiliary agent into the electrolyte, the battery is ensured to have better cycling stability, and meanwhile, the applicability in a battery production process is good.
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Description

technical field

[0001] The present application relates to the technical field of batteries, in particular, to an electrolyte solution and a lithium-ion battery. Background technique

[0002] During the first charging process of a lithium-ion battery, the formation of a solid electrolyte film (SEI) on the surface of the negative electrode will consume a large amount of active lithium, resulting in irreversible lithium loss, resulting in a reduction in recyclable lithium, reducing the first coulombic efficiency and battery capacity of the battery , which reduces the energy density of the battery.

[0003] At present, lithium-containing compounds are usually added to replace the active material of the positive electrode on the side of the positive electrode of the battery to make up for the loss of lithium ions caused by the formation of the SEI film on the surface of the negative electrode. However, the added lithium-containing compound has a high decomposition potential and ...

Claims

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