Cathode material for lithium ion batteries and preparation method thereof

A lithium-ion battery and positive electrode material technology, applied in the field of lithium-ion battery positive electrode materials and their preparation, can solve the problems of battery capacity and rate performance decline, failure to achieve electrical performance, poor ion conductivity, etc., to maintain electrochemical inertness, improve Electron conductivity, effect of slow desorption reaction

Active Publication Date: 2015-12-23
HUNAN SHANSHAN ENERGY TECH CO LTD
View PDF3 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used coating substances are mostly metal or nonmetal oxides, metal fluorides, phosphates, carbon materials and conductive polymers, etc., which can prevent the positive electrode material particles from directly contacting the electrolyte. However, the oxidation of metal or nonmetal Although compounds, fluorides, and phosphates have certain electronic conductivity, they have no ion conductivity; car

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
  • Cathode material for lithium ion batteries and preparation method thereof
  • Cathode material for lithium ion batteries and preparation method thereof
  • Cathode material for lithium ion batteries and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A lithium ion battery positive electrode material of the present invention is a core-shell structure, and the "core" is the positive electrode active material lithium cobaltate (LiCo 0.995 Ti0.002 Mg 0.003 o 2 ), the "shell" is containing point-like nano-Li 2 TiO 3 The carbon layer, the carbon layer is evenly coated on the surface of lithium cobalt oxide; where the nanometer Li 2 TiO 3 The quality of carbon accounts for 0.8wt% of positive electrode active material quality, and the quality of carbon in carbon layer accounts for 1.2wt% of positive electrode active material quality; ) is calcined and carbonized at high temperature, and the point-like nano-Li in the carbon layer 2 TiO 3 It is generated in situ in the carbon layer during the high-temperature calcination and carbonization process of phenolic resin.

[0035] The preparation method of above-mentioned lithium ion battery cathode material, comprises the following steps:

[0036] 1) Take 195.5g of cetyltri...

Embodiment 1 and comparative example 1

[0050] Table 1 embodiment 1 and comparative example 1,2 electrochemical properties

[0051]

[0052] After the lithium-ion battery positive electrode material of Example 1 is made into a battery, at 25° C., its buckle charge performance is tested with 3.0 to 4.5 V, and its 1C discharge capacity is 191.2mAh / g; the rate 1C / 0.2C is 96.3%, and 3C / 0.2C is 88.5%; after 50 cycle tests, the capacity retention rate of the battery is 96.6%; the high-temperature storage performance of the full battery is tested at 3.0-4.35V, and the battery capacity retention rate at 85°C / 6h is 90.4%. The rate is 95.8%. From figure 1 , figure 2 As can be seen from Table 1: the lithium ion battery positive electrode material of embodiment 1 is compared with the battery capacity, cycle, rate and safety performance of the lithium ion battery positive electrode material modified by the single coating layer of comparative example 1 and comparative example 2. Significantly improved.

Embodiment 2

[0054] A lithium-ion battery positive electrode material of the present invention is a core-shell structure, and the "core" is the positive electrode active material lithium nickel cobalt manganese oxide (LiNi 0.6 co 0.2 mn 0.2 o 2 ), the "shell" is containing point-like nano-Li 2 TiO 3 The carbon layer, the carbon layer is uniformly coated on the surface of nickel-cobalt-lithium manganese oxide; the nano-Li 2 TiO 3 The quality of carbon accounts for 1.6wt% of positive electrode active material quality, and the quality of carbon in carbon layer accounts for 3.0wt% of positive electrode active material quality; It is calcined and carbonized at high temperature, and the point-like nano-Li in the carbon layer 2 TiO 3 It is generated in situ in the carbon layer during the high-temperature calcination and carbonization process of phenolic resin.

[0055] The preparation method of above-mentioned lithium ion battery cathode material, comprises the following steps:

[0056] ...

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
Discharge capacityaaaaaaaaaa
Magnificationaaaaaaaaaa
Login to view more

Abstract

The invention discloses a cathode material for lithium ion batteries. The cathode material is a core-shell structure. The ''core'' of the core-shell structure is a cathode active material, and the ''shell'' of the core-shell structure is a carbon layer containing discontinuous nano-LixMOy. The carbon layer uniformly coats the cathode active material. The LixMOy is one or more of LiAlO2, Li2TiO3 or Li2ZrO3. The cathode active material is one or more of lithium cobalt oxide, LiNixCoyMn1-x-yO2, lithium manganate, lithium nickel manganese oxide and LiNi_(0.7)Co_(0.3-x)Al_xO_2. A preparation method of the cathode material comprises the following steps: adding the cathode active material, nano-LixMOy, phenol, aldehyde and a catalyst into a surfactant and uniformly dispersing, carrying out vacuum filtration, washing and drying, calcining in the inert atmosphere and cooling to prepare the cathode material. The cathode material for lithium ion batteries has good electrochemical stability. A battery prepared from the cathode material has excellent cycle and rate performance, and capacity retention ratio of the battery is high.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a positive electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, wide operating temperature range, no memory effect, and long cycle life. They are widely used in digital products and power tools, and are considered to be ideal power sources for next-generation electric vehicles. The development of lithium-ion batteries with high energy density, high power density, and high safety has broad market prospects. Cathode material is one of the key materials restricting the performance of lithium-ion batteries. Due to the high potential of the positive electrode material, the positive electrode material in the delithiated state has strong oxidative properties, and is prone to side reactions with organic electrolytes to generate gas, causing safety hazards ...

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
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/485H01M4/505H01M4/525H01M4/624H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 朱振华石慧李旭蒋湘康谭欣欣王志兴李智华
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap