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Electrolyte solution for nonaqueous electrolyte batteries and nonaqueous electrolyte battery using same

A non-aqueous electrolyte and electrolyte technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolytes, battery electrodes, etc., can solve problems such as low thermal stability, strict requirements for battery energy density, and concerns about cobalt burial. Achieving the effect of excellent durability improvement effect

Active Publication Date: 2020-08-11
CENT GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although nickel oxide has a high theoretical capacity, it has low thermal stability during charging. Initially, cobalt oxide, manganese oxide, and iron phosphate were mainly used as positive electrode active materials.
However, the demand for increasing the energy density of batteries has become more stringent, and there are concerns about the amount of cobalt buried in natural resources. Therefore, ternary positive electrodes composed of nickel, cobalt, and manganese "1:1" are gradually being used. than 1"

Method used

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  • Electrolyte solution for nonaqueous electrolyte batteries and nonaqueous electrolyte battery using same
  • Electrolyte solution for nonaqueous electrolyte batteries and nonaqueous electrolyte battery using same
  • Electrolyte solution for nonaqueous electrolyte batteries and nonaqueous electrolyte battery using same

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Experimental program
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Effect test

no. 1 approach

[0121] 1. Electrolyte for non-aqueous electrolyte battery

[0122] The electrolyte solution for non-aqueous electrolyte batteries according to the first embodiment of the present invention is an electrolyte solution for non-aqueous electrolyte batteries comprising a positive electrode, and the positive electrode contains at least one or more oxides containing nickel as a positive electrode active material, The nickel content in the metal contained in the positive electrode active material is 30-100% by mass, and the electrolyte solution contains:

[0123] (1) non-aqueous organic solvent,

[0124] (II) Ionic salts as solutes,

[0125] (III) at least one selected from the group consisting of compounds represented by the above general formula (1), and

[0126] (IV) selected from LiSO 3F, the compound with O=S-F bond represented by the above general formula (2), the compound with O=P-F bond represented by the above general formula (3), the compound with P(=O )F 2 At least one...

no. 2 approach

[0232] 1. Electrolyte for non-aqueous electrolyte battery

[0233] The electrolyte solution for the non-aqueous electrolyte battery described in the second embodiment of the present invention comprises:

[0234] (1) non-aqueous organic solvent,

[0235] (II) Ionic salts as solutes,

[0236] (III) at least one additive selected from the group consisting of compounds represented by the above general formula (1), and

[0237] (IV) At least one additive selected from the group consisting of compounds represented by the above general formula (6).

[0238] About (I) non-aqueous organic solvents

[0239] As the non-aqueous organic solvent, the same non-aqueous organic solvent as that of the first embodiment can be suitably used. Although different from the category of non-aqueous solvents, ionic liquids and the like can also be used.

[0240] In addition, in the second embodiment, when the non-aqueous organic solvent is at least one selected from the group consisting of cyclic c...

Embodiment

[0278] Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited at all by these descriptions.

[0279] First, as follows, a non-aqueous electrolyte battery using the non-aqueous electrolyte solution described in the first embodiment was fabricated and evaluated for performance.

[0280] 〔Production of positive electrode of NCM811〕

[0281] to LiNi 0.8 mn 0.1 co 0.1 o 2 4.5 mass % of polyvinylidene fluoride (hereinafter referred to as PVDF) as a binder and 4.5 mass % of acetylene black as a conductive material were mixed in 91.0 mass % of the powder, and N-methyl-2-pyrrolidone (hereinafter referred to as NMP) was further added. ), making positive electrode composite material paste. This paste was applied to both sides of an aluminum foil (A1085), dried, pressurized, and then punched out to 4×5 cm to obtain an NCM811 positive electrode for testing.

[0282] 〔Production of NCA cathode〕

[0283] to LiNi 0.87 co 0.10 al 0....

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Abstract

This electrolyte solution for nonaqueous electrolyte batteries contains (I) a nonaqueous organic solvent, (II) a solute which is an ionic salt, (III) at least one additive which is selected from the group consisting of compounds represented by general formula (1), and (IV) an additive which has a specific structure. Due to the combined use of the component (III) and the component (IV), effects such as reduction of Ni dissolution from the Ni-rich positive electrode into the electrolyte solution and improvement of the storage stability of the electrolyte solution at high temperatures are able tobe achieved without deteriorating the capacity retention rate after cycles.

Description

technical field [0001] The present invention relates to an electrolyte solution for a nonaqueous electrolyte battery and a nonaqueous electrolyte battery using the same. Background technique [0002] In recent years, batteries as electrochemical devices have been used in small and high-energy-density power storage systems for information-related equipment, communication equipment, personal computers, video cameras, digital cameras, mobile phones, and smart phones, and for electric vehicles. , HEV, fuel cell vehicle auxiliary power supply, storage and other large-scale, power-use power storage systems have attracted much attention. One of the candidates is a non-aqueous electrolyte secondary battery including a lithium-ion battery with high energy density, high voltage, and high capacity, and research and development are currently being actively carried out. In particular, optimization of various battery constituent elements including positive and negative active materials h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/525H01M10/0568H01M10/0569
CPCY02E60/10H01M4/525H01M10/0567H01M10/0569H01M10/0568H01M2300/0025H01M2300/004H01M10/0525H01M4/382H01M2300/0022H01M10/052H01M10/054H01M2300/0037H01M4/505H01M2004/028H01M2300/0028H01M4/131H01M4/5825H01M4/463H01M4/485H01M4/386H01M4/387H01M4/405H01M4/587H01M10/4235H01M2300/0034
Inventor 高桥幹弘森中孝敬新免益隆河端涉久保诚森克将江崎亮太谷川贵宽
Owner CENT GLASS CO LTD