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Lithium secondary battery

A lithium secondary battery and battery resistance technology, which is applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve the major safety problems of lithium secondary batteries and other issues

Inactive Publication Date: 2017-08-18
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] On the other hand, the safety of lithium secondary batteries with high capacity, high output and high energy density has become a big issue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0700] A coin-type lithium secondary battery (coin-type battery) was manufactured by the following procedure.

[0701]

[0702] 100 parts of artificial graphite, 1.1 parts of carboxymethylcellulose, and 1.5 parts of SBR latex were kneaded with a water solvent to prepare a pasty negative electrode mixture slurry.

[0703] Next, this negative electrode mixture slurry was applied to a negative electrode current collector made of strip-shaped copper foil with a thickness of 18 μm, dried, and then compressed with a roll press to obtain a sheet formed of the negative electrode current collector and the negative electrode active material layer. shaped negative pole. The coating density of the negative electrode active material layer at this time was 10.8 mg / cm 2 , the packing density is 1.3g / mL.

[0704]

[0705] Will LiNi 0.5 mn 0.3 co 0.2 o 2 (90 parts), acetylene black SP (4 parts), graphite KS6 (2 parts), polyvinylidene fluoride (2 parts), the above-mentioned polymer P1...

Embodiment 1-2

[0783] In preparation of the non-aqueous electrolytic solution, a coin-type battery was produced in the same manner as in Example 1-1 except that ethylene carbonate (VEC) was used instead of VC.

[0784] VEC is an example of a carbonate compound having a carbon-carbon unsaturated bond as the additive (X).

Embodiment 1-3

[0788] In preparation of the non-aqueous electrolytic solution, except that 4-fluoroethylene carbonate (FEC) was used instead of VC, it carried out similarly to Example 1-1, and produced the coin type battery.

[0789] FEC is an example of a carbonate compound having a halogen atom and no carbon-carbon unsaturated bond as the additive (X).

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Abstract

A lithium secondary battery which is provided with: a positive electrode containing a positive electrode active material that are capable of absorbing and desorbing lithium; a negative electrode containing a negative electrode active material that are capable of absorbing and desorbing lithium; and a nonaqueous electrolyte solution. At least one of the positive electrode and the negative electrode contains a polymer that is a reaction product of a compound (A) and a compound (B), and the nonaqueous electrolyte solution contains an additive (X). The additive (X) is at least one compound that is selected from the group consisting of carbonate compounds having a carbon-carbon unsaturated bond, carbonate compounds having a halogen atom, alkali metal salts, sulfonic acid ester compounds, sulfuric acid ester compounds, nitrile compounds, dioxane compounds and substituted aromatic hydrocarbon compounds. The compound (A) is at least one compound that is selected from the group consisting of amine compounds, amide compounds, imide compounds, maleimide compounds and imine compounds. The compound (B) is a compound having two or more carbonyl groups in each molecule, said compound being other than the compound (A).

Description

technical field [0001] The present invention relates to a rechargeable and dischargeable lithium secondary battery used in a power supply of a portable electronic device, in-vehicle, power storage, and the like. Background technique [0002] In recent years, lithium secondary batteries have been widely used as power sources for electronic devices such as mobile phones and notebook personal computers, electric vehicles, and power storage. Especially recently, the demand for high-capacity, high-output, and high-energy-density batteries that can be mounted on hybrid vehicles and electric vehicles has rapidly increased. [0003] The above-mentioned lithium secondary battery is mainly composed of a positive electrode containing a material capable of occluding and releasing lithium, a negative electrode containing a material capable of occluding and releasing lithium, and a non-aqueous electrolytic solution containing a lithium salt and a non-aqueous solvent. [0004] As the posi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/62H01M10/0567H01M10/058
CPCH01M10/0567H01M10/052C07D239/62C07D317/36C07D317/40Y02E60/10Y02P70/50H01M10/0568H01M4/62H01M10/058Y02T10/70H01M4/131
Inventor 张涵小礒亚由美重松明仁饭室裕永川桂大千田光昭林贵臣大西仁志宫里将敬藤山聪子
Owner MITSUI CHEM INC
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