Unlock instant, AI-driven research and patent intelligence for your innovation.

Lithium ion battery

A secondary battery and lithium-ion technology, applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of reduced Coulombic efficiency, performance degradation, oxidative decomposition of carbonate solvents, etc., and achieve excellent Coulombic efficiency and cycle life excellent effect

Inactive Publication Date: 2012-05-16
HITACHI LTD
View PDF13 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in a lithium-ion secondary battery using a high-potential positive electrode exhibiting a potential of 4.5 V or higher, there is a problem that the above-mentioned carbonate-based solvent is oxidatively decomposed on the surface of the positive electrode.
Therefore, the coulombic efficiency (ratio of discharge capacity to charge capacity) decreases due to the consumption of electricity due to oxidation and decomposition, the gas generated by the oxidation and decomposition of the solvent causes the internal pressure of the battery to increase or the expansion of the outer package, and the reduction of the electrolyte or its composition occurs. Issues such as reduction in performance due to changes, especially reduction in cycle life

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium ion battery
  • Lithium ion battery
  • Lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0081] Battery A, battery B, and battery C serving as the batteries of this embodiment were fabricated as follows.

[0082] Manufacture of LiMn as a positive electrode active material that exhibits a potential of 4.5 V or higher based on metallic lithium1.52 Ni 0.48 o 4 .

[0083] As a raw material, weigh manganese dioxide (MnO 2 ) and nickel oxide (NiO) to achieve the prescribed composition ratio, wet mixing with pure water. After drying, heat up at 3°C / min and cool down at 2°C / min in an electric furnace, and bake at 1000°C for 12 hours in an air atmosphere. After pulverizing the calcined body, it was mixed with lithium carbonate (Li 2 CO 3 ) are also wet mixed. After drying, the temperature was raised at 3°C / min, and the temperature was lowered at 2°C / min, and calcined at 800°C for 20 hours in an air atmosphere. This was pulverized to obtain a positive electrode active material.

[0084] A solution obtained by dissolving 91% by weight of the positive electrode active...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

A high-voltage lithium ion battery of the present invention has a cathode generating a potential of 4.5 V or higher on the metal lithium basis, an anode, and a nonaqueous electrolyte having a lithium salt dissolved in a nonaqueous solvent. A cathode coating layer is on at least a part of the surface of a cathode material mix and includes boron whose amount is equal to or greater than 0.0001% and equal to or less than 0.005% by weight of the cathode material mix.

Description

technical field [0001] The invention relates to a high-voltage lithium-ion secondary battery whose positive electrode is used at a potential of 4.5V or higher based on lithium metal. Background technique [0002] In recent years, as a power supply that uses a plurality of batteries used in electric vehicles or hybrid electric vehicles, or for storing electric energy, etc. in series, or as a power supply with higher energy density, a voltage higher than the conventional voltage of about 4V is required. Lithium-ion secondary battery. [0003] A high-voltage lithium-ion secondary battery has a positive electrode material whose positive electrode stably exhibits a potential of 4.5 V or higher based on metallic lithium. As such a positive electrode active material, known with the general formula LiMn 2-x m x o 4 (M=Ni, Co, Cr, Fe, etc.) the transition metal substitution of spinel Mn oxide, or the general formula LiMPO 4 Those represented by (M=Ni, Co) are generally called ol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/62
CPCY02E60/122H01M10/052H01M4/628H01M10/0566H01M4/366Y02E60/10Y02P70/50H01M10/0525H01M4/62H01M10/0568H01M10/0569
Inventor 山木孝博
Owner HITACHI LTD