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Lithium ion battery

A lithium-ion battery and electrolyte technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reduced safety performance, accelerated cycle decay, and easy oxidation of electrolyte, and achieves high rate performance and low temperature performance. Effect

Inactive Publication Date: 2012-09-26
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the working voltage increases, the electrolyte is more likely to be oxidized, the cycle attenuation is accelerated, the safety performance is reduced, and the risk of actual use increases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: A kind of lithium-ion battery, comprises positive electrode sheet, negative electrode sheet, separator and electrolyte, positive electrode sheet and negative electrode sheet are all made up of active material, conductive additive, binding agent and current collector, conduction The additive is a three-dimensional spatial conductive network formed by mixing zero-dimensional, one-dimensional and two-dimensional carbon materials. Sheet-shaped conductive carbon materials can form a conductive network framework, while linear conductive carbon can be interspersed between two-dimensional sheet-shaped conductive carbon layers, or a linear cross-linked conductive network can be formed outside the two-dimensional sheet-shaped conductive carbon, further , zero-dimensional conductive carbon particles can build conductive points between one-dimensional linear and two-dimensional sheet conductive carbon, and compensate for the electrical conductivity of tiny positive e...

Embodiment 2

[0039] Embodiment 2: The conductive additive used in this embodiment is mixed by SP, CNT and graphene three, and wherein SP particle is 50-200nm, and the percentage by weight of accounting for conductive additive is 20%; The length of CNT is 500nm-5um , the percentage by weight of the conductive additive is 30%; the graphene adopts multi-layer graphene, and the weight percentage of the conductive additive is 50%.

[0040] The positive electrode active material used in this example is composed of two kinds of LiCoO with different shapes, A and B. 2 Composed of, where A is the primary particle, D50 is 18um; B is the secondary particle formed by the aggregation of primary particles, the primary particle size is 1-2 um, and the secondary particle size D50 is 14um; and A occupies the positive electrode The weight percentage of active substance is 80%.

[0041] The solvent system of the electrolyte used in this example is EC:EMC:DEC, the volume ratio is 1:1:1, the additiv...

Embodiment 3

[0043] Embodiment 3: The conductive additive used in this embodiment is mixed by SP, VGCF and graphene three, and wherein SP particle is 50-200nm, and the weight percent that accounts for conductive additive is 15%; The length of VGCF is 500nm-4um , the percentage by weight of the conductive additive is 25%; the graphene adopts multi-layer graphene, and the weight percentage of the conductive additive is 60%.

[0044] The positive active material used in this example is made of LiCoO 2 Primary particles and Li(Ni 0.5 co 0.2 mn 0.3 )O 2 mixed, where LiCoO 2 The particle size D50 is 19 quotient um; Li(Ni 0.5 co 0.2 mn 0.3 )O 2 The particle size of the primary particle is 1-2 um, and the particle size D50 of the secondary particle is 11 um; and the weight percentage of A in the positive electrode active material is 60%.

[0045] The solvent system of the electrolyte used in this example is EC:EMC:DEC, the volume ratio is 1:1:1,...

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Abstract

The invention discloses a lithium ion battery, which comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein each of the positive and plates consists of an active material, a conductive additive, an adhesive and a current collector; and the conductive additive is a three-dimensional space conductive network formed by mixing a zero-dimensional material, a one-dimensional material and a two-dimensional material. A specific cathode active material and a conductive carbon material with the three-dimensional space conductive network are adopted, and a small amount of wetting agent, a small amount of lithium salt stabilizing agent, a small amount of cathode film forming additive and a small amount of anode film forming protective agent are added into the electrolyte, so that the lithium ion battery can work under high cut-off voltage, and has the advantages of high cycling performance, high rate capability, high low-temperature performance, low high-temperature bulging and the like, and the energy density of the lithium ion battery is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery with high energy density. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages such as high energy density, good cycle performance, high operating voltage, and no memory effect. With the rapid development of electronic technology, people put forward higher energy density and longer cycle performance requirements for lithium-ion batteries. Therefore, the development of high-performance cathode materials is particularly important for the development of lithium-ion batteries. [0003] Among the currently commercialized cathode materials for lithium-ion batteries, the most widely used and mature cathode material is lithium cobalt oxide (LiCoO 2 ), its reversible gram capacity at 4.2V cut-off voltage is only about 140mAh / g, which is relatively low. Increasing th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/505H01M4/525H01M4/583
CPCY02E60/122Y02E60/10
Inventor 姜玲燕
Owner DONGGUAN AMPEREX TECH