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Lithium ion battery with high energy density

A lithium-ion battery, high energy density technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of low reversible capacity, limited use, too fast decay of voltage platform, etc.

Active Publication Date: 2019-09-10
BERZELIUS (NANJING) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when lithium-rich manganese-based materials are used alone as cathode materials, there are problems such as low reversible capacity, too low compacted density, and too fast decay of the voltage plateau, which have limited their use in commercial batteries.
In addition, people thought of using lithium-rich manganese-based materials as a positive electrode auxiliary additive mixed with other positive electrode materials, but the capacity limited to lithium-rich manganese-based materials (260-320mAh / g) is not much higher than that of traditional positive electrodes. Moreover, the reduction of the compaction density of the counter electrode and the voltage range of its capacity advantage are higher than the safety range of the current commercial battery, so this method does not bring significant performance advantages to the battery.

Method used

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  • Lithium ion battery with high energy density
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  • Lithium ion battery with high energy density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Weigh Li 2 O 508.0g, LiH 16.0g, add ball milling beads according to the ratio of ball to material 4:1, use a ball mill to grind for 30min, add Co 3 o 4 476.8g, add 3.5g of Al 2 o 3 At the same time, the corresponding ball-milling beads were supplemented according to the ball-to-material ratio of 4:1, and ball milling was continued for 30 minutes to obtain evenly mixed Li 2 O, LiH, Co 3 o 4 and Al 2 o 3 mixture. The obtained material was placed in an electric furnace at a constant temperature of 400° C. for 24 h under an argon atmosphere. After free cooling to room temperature, it was taken out, ground and sieved to obtain a lithium-rich cobalt oxide (Li 6 co 0.99 Al 0.01 o 4 ).

[0097] The positive electrode active material nickel-cobalt-manganese ternary material (Li(Ni 0.5 mn 0.3 co 0.2 )O 2 ), a lithium-rich cobalt oxide material (Li 6 co 0.99 Al 0.01 o 4 ) mixed with conductive agent multi-layer graphene and thickener / binder polyvinylidene flu...

Embodiment 2

[0104] Weigh Li 2 O 508.0g, LiH 16.0g, add ball milling beads according to the ratio of ball to material 4:1, use a ball mill to grind for 30min, add Co 3 o 4 481.6g, supplement corresponding ball-milling beads by ball-to-material ratio 4:1 simultaneously, continue ball-milling 30min, obtain the evenly mixed Li 2 O, LiH and Co 3 o 4 mixture. The obtained material was placed in an electric furnace at a constant temperature of 900° C. for 12 h under an argon atmosphere. Obtain the first product after natural cooling, put into the ball mill after the first product is crushed, weigh the Al at the same time 2 o 3 20.1g was added to the ball mill jar. Add ball milling beads according to the ball-to-material ratio of 6:1, and mill for 20 minutes. Put the material into an electric furnace and keep the temperature at 700° C. for 4 hours under an argon atmosphere. After free cooling to room temperature, it was taken out, ground and sieved to obtain a lithium-rich cobalt oxide...

Embodiment 3

[0113] Weigh Li 2 O 268.9g, add ball milling beads according to the ball-to-material ratio of 4:1, use a ball mill to grind for 30min, add CoO2 20.3g, weigh ZnO 2.5g, TiO 2 2.3g, at the same time supplement the corresponding ball milling beads according to the ball-to-material ratio of 4:1, and continue the ball milling for 30min to obtain evenly mixed Li 2 O, CoO, ZnO, and TiO 2 mixture. The obtained material was placed in an electric furnace at a constant temperature of 1000° C. for 10 h under an argon atmosphere. Obtain the first product after natural cooling, put into the ball mill after the first product is crushed, weigh the Al at the same time 2 o 3 Add 0.2g into the ball mill jar. Add ball milling beads according to the ball-to-material ratio of 6:1, and mill for 20 minutes. Put the material into an electric furnace and keep the temperature at 600° C. for 4 hours under an argon atmosphere. After free cooling to room temperature, it was taken out, ground and sie...

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Abstract

The invention relates to a lithium ion battery, which comprises: (1) a positive electrode, (2) a negative electrode, (3) a diaphragm, (4) electrolyte and (5) a packaging material. The active materialin the positive electrode is made by simple physical mixing of a lithium-rich cobalt oxide material and other lithium-containing metal oxide positive materials. The active material is made into the positive electrode first, and then, the battery is made. A lithium ion battery with high energy density and good cycle performance can be obtained by making use of the high capacity characteristic of lithium-rich cobalt oxide. The preparation method of the lithium ion battery of the invention is simple and efficient and has good repeatability, and can truly realize large-scale production of lithiumion batteries with higher energy density.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high energy density lithium ion battery. Background technique [0002] As a major form of new energy, lithium-ion batteries have been continuously affecting people's basic lifestyles at home and abroad. In today's society, almost any person has more than one lithium-ion battery. The development of terminal industries such as mobile phones, tablet computers, smart wearables, drones, and electric vehicles largely depends on the progress of batteries. [0003] At present, China has become the core force in the research and development and production of lithium-ion battery electric vehicles in the world. On February 20, 2017, the Ministry of Industry and Information Technology, the National Development and Reform Commission, the Ministry of Science and Technology, and the Ministry of Finance jointly issued the "Notice on Printing and Distributing the Action Plan for Promoting...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/36H01M4/505H01M4/525H01M4/58
CPCH01M4/364H01M4/505H01M4/525H01M4/5825H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 王岑张和宝李喆陆玉婷叶兰
Owner BERZELIUS (NANJING) CO LTD
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