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A lithium-ion battery hybrid cathode material

A technology of mixing cathode materials and lithium-ion batteries, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of inability to achieve consistent delithiation, prone to mixing, and deteriorate battery performance, and improve the compaction density. Low, guaranteed lithium impurity content, simple preparation process

Active Publication Date: 2016-09-07
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, ternary materials have attracted much attention in recent years, but the material also has certain defects: its actual compacted density is only 3.6g / cm 3 , low discharge voltage platform and strong water absorption; it is particularly noteworthy that: Li in the structure + and Ni 2+ It is easy to mix and discharge, which leads to the release of active oxygen and makes the high-priced nickel ions easy to catalyze the decomposition of the electrolyte, so that the lithium-ion battery made of ternary materials will generate a large amount of gas when stored at high temperature, which will deteriorate the performance of the battery, especially for the use of aluminum Plastic composite film is used as the outer packaging of lithium-ion batteries, and the outer shell is relatively soft. The generation of gas will cause the rapid expansion and deformation of the battery, which will bring serious safety hazards and limit its use.
However, the high-nickel ternary material coated with a layer of metal oxide involved in this patent application is likely to cause the surface coating layer to fall off during the mixing process with lithium cobalt oxide.
At the same time, during the sintering process after the ternary material is mixed with lithium cobalt oxide, the unshedding coating layer is easy to be excessively embedded in the ternary material, thereby destroying the original metal layer structure, causing mixed discharge, and resulting in the use under high voltage. There are problems of high temperature storage flatulence and poor cycle performance
In addition, because the powder resistance and discharge potential of the ternary material are different from those of lithium cobaltate, it is easy to cause the two to be inconsistent in the amount of delithiation after mixing, so that one of the materials is excessively delithiated, while the other is not completely delithiated. "Activated", resulting in faster capacity decay when cycled at high voltage
At the same time, multiple sintering processes will increase the cost

Method used

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  • A lithium-ion battery hybrid cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: This embodiment provides a lithium-ion battery hybrid positive electrode material, the positive electrode material is LiCoO 2 and LiNi 0.5 co 0.2 mn 0.3 o 2 The hybrid material, among them, LiCoO 2 The median particle size D50 is 10µm, LiNi 0.5 co 0.2 mn 0.3 o 2 The particle size of the single crystal particles is 1µm, LiNi 0.5 co 0.2 mn 0.3 o 2 and LiCoO 2 The mass ratio is 2:8, through the LiCoO 2 and LiNi 0.5 co 0.2 mn 0.3 o 2 Al was added during the mixing process 2 o 3 And after sintering, making Al 2 o 3 Evenly distributed in LiNi 0.5 co 0.2 mn 0.3 o 2 and LiCoO 2 surface, and makes LiNi 0.5 co 0.2 mn 0.3 o 2 and LiCoO 2 A molten network layer is formed between them.

[0028] Among them, the LiNi wrapped in the molten network layer 0.5 co 0.2 mn 0.3 o 2 and LiCoO 2 The total number of particles is from 2 to 50.

[0029] Melted network layer wrapped LiNi 0.5 co 0.2 mn 0.3 o 2 and LiCoO 2 The final diame...

Embodiment 2

[0033] Embodiment 2: The difference from Embodiment 1 is: LiCoO 2 The median particle size D50 of LiNi is 12µm; LiNi 0.5 co 0.2 mn 0.3 o 2 The particle size of the single crystal particles is 2 μm, and the others are the same as those in Example 1, and will not be repeated here.

Embodiment 3

[0034] Embodiment 3: Different from Embodiment 1: the positive electrode material is LiCo 0.9 Mg 0.1 o 2 and LiNi 0.5 co 0.2 Mg 0.3 o 2 of hybrid materials, where LiCo 0.9 Mg 0.1 o 2 The median particle size D50 of LiNi is 15µm; LiNi 0.5 co 0.2 Mg 0.3 o 2 The particle size of the single crystal particles is 3µm, LiCo 0.9 Mg 0.1 o 2 and LiNi 0.5 co 0.2 Mg 0.3 o 2 The mass ratio is 1:5.

[0035] The sintering is LiCo 0.9 Mg 0.1 o 2 、LiNi 0.5 co 0.2 Mg 0.3 o 2 and Al 2 o 3 After the three are mixed evenly, the temperature is raised at a rate of 3°C / min, and the mixture is burned at a constant temperature of 900°C in an air atmosphere for 4 hours.

[0036] Others are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a mixed positive-pole material for a lithium ion battery. According to the mixed positive-pole material for the lithium ion battery, the positive-pole material is a mixed material of a lithium-cobalt-oxide-based active substance A and a lithium-nickel-cobalt-manganese-based ternary active substance B; the median particle diameter of the lithium-cobalt-oxide-based active substance A is smaller than or equal to 15 microns, and the particle diameter of single-crystal particles of the lithium-nickel-cobalt-manganese-based ternary active substance B is greater than or equal to 1.0 micron; and after adding a metal oxide and sintering during the mixing of the lithium-cobalt-oxide-based active substance A and the lithium-nickel-cobalt-manganese-based ternary active substance B, the metal oxide is uniformly distributed on the surfaces of the lithium-cobalt-oxide-based active substance A and the lithium-nickel-cobalt-manganese-based ternary active substance B, and a molten reticular layer is formed between the lithium-cobalt-oxide-based active substance A and the lithium-nickel-cobalt-manganese-based ternary active substance B. When the mixed positive-pole material provided by the invention is used at high voltage, the gram capacity is higher than or equal to 156 mAh / g, and the compaction density is higher than or equal to 4.05 g / cm<3>; and at high voltage, the lithium ion battery has the characteristics of good cycle performance, high temperature storage and safety.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery mixed positive electrode material with high capacity and high compaction density. Background technique [0002] With the multi-functionalization of consumer electronic products, people have higher and higher requirements on the endurance, service life, safety performance and price of lithium-ion batteries as the power supply of consumer electronic products. The cathode material is one of the key materials that restrict the cost performance of lithium-ion batteries. Improving the capacity and compaction density of the cathode material is the two main aspects to improve the battery life of lithium-ion batteries. [0003] At present, the widely used cathode material is mainly LiCoO 2 , the compacted density of the positive electrode membrane composed of this material can reach 4.1g / cm 3 , and the lithium-ion battery using the positive electrode ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/48
CPCY02E60/10
Inventor 谭欣欣阮丁山柳娜陈杰邝泉王梦
Owner DONGGUAN AMPEREX TECH
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