lithium secondary battery

A lithium secondary battery and non-aqueous electrolyte technology, which is applied in lithium storage batteries, battery electrodes, non-aqueous electrolyte storage batteries, etc., can solve the problems of reduced output and charge/discharge performance, high demand for lithium secondary battery technology, and achieve Effects of improved charge/discharge capacity and output, improved low-temperature characteristics, and excellent performance

Active Publication Date: 2020-03-06
SK ON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, at low temperatures, the problem of reduced output and charge / discharge performance due to a decrease in electrochemical reaction speed is serious, and therefore, there is currently a high demand for lithium secondary battery technology with excellent low-temperature characteristics

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0080]

[0081] A Ti-doped lithium-metal oxide (hereinafter CAM1) having a concentration gradient region of nickel and manganese in the middle part between the center part and the surface part is used as an anode active material, and the overall composition of the lithium-metal oxide is for LiNi 0.80 co 0.10 mn 0.10 o 2 , the composition of the central part is LiNi 0.83 co 0.10 mn 0.07 o 2 , the composition of the surface part is LiNi 0.78 co 0.10 mn 0.12 o 2 ; Superconducting acetylene carbon black (DenKa Black) is used as a conductive material; polyvinylidene fluoride (PVDF) is used as a binder, and after preparing the anode slurry with each mass ratio of 92:5:3, The prepared anode slurry is coated on an aluminum substrate, and then dried and pressed to obtain an anode.

[0082] For reference, the concentration gradient of the lithium-metal oxide used is shown in Table 1 below, and the concentration measurement position is as follows figure 1 shown in . The me...

Embodiment 2-30

[0092] A battery was prepared in the same manner as in Example 1 except for changing the type and concentration of the transition metal doped in the anode active material.

[0093] The types and concentrations of transition metals are described in Table 3 below.

Embodiment 31-40

[0095] In the same manner as in Example 1, except that a lithium-metal oxide doped with a transition metal (hereinafter CAM2) having a concentration gradient region of nickel and manganese in the region between the central part and the surface part was used as an anode active material Prepare the battery, the overall composition of the lithium-metal oxide is LiNi 0.80 co 0.11 mn 0.09 o 2 , the composition of the central part is LiNi 0.8 co 0.11 mn 0.088 o 2 , the composition of the surface part is LiNi 0.77 co 0.11 mn 0.12 o 2 .

[0096] For reference, the concentration gradient of the lithium-metal oxide used is shown in Table 2 below, and the concentration measurement position is as follows figure 1 shown in . The measurement position was measured at intervals of 0.4 μm from the center of the lithium-metal oxide particle whose distance from the center of the particle to the surface was 4.8 μm.

[0097] The cross-sectional scanning electron micrograph of the anod...

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Abstract

The present invention relates to a lithium secondary battery, and in more detail, to a lithium secondary battery capable of exhibiting excellent performance even in a low-temperature environment because of having the following composition, the charge / discharge capacity and output at low temperature are remarkably improved Lithium secondary battery. The lithium secondary battery includes an anode, a cathode, and a non-aqueous electrolyte, and the anode includes an anode active material containing a lithium-metal oxide, at least one of metals of the lithium-metal oxide is in the center to There is a concentration gradient region between the surface portions, and the lithium-metal oxide is doped with a transition metal.

Description

technical field [0001] The present invention relates to a lithium secondary battery, and more specifically, to a lithium secondary battery excellent in low-temperature characteristics. Background technique [0002] Along with the rapid development of electronics, communication and computer industries, portable electronic communication devices such as video cameras, mobile phones and notebook computers are developing brilliantly. Therefore, the demand for lithium secondary batteries as a power source capable of driving them is also increasing. In particular, in addition to South Korea, countries such as Japan, Europe, and the United States have also conducted extensive research on the application of environmentally friendly power sources to electric vehicles, uninterruptible power supply devices, electric tools, and artificial satellites. [0003] Among the currently used secondary batteries, the structure of the lithium secondary battery developed in the early 1990s is: a c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/052
CPCH01M4/485H01M4/505H01M4/525H01M10/052H01M4/362H01M4/364C01G53/42C01G53/50C01P2002/52C01P2002/54C01P2004/03C01P2004/61C01P2006/40Y02E60/10H01M4/131H01M4/62
Inventor 刘炅傧韩国炫黄德哲
Owner SK ON CO LTD
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