For leading companies, advance research and development and technical
reserves of forward-looking technologies are directly related to whether they
can remain invincible in future competition.
As a unicorn in the field of high-nickel cathode materials in China,
Rongbai Technology became the first company to accept IPO on the Science and
Technology Innovation Board on March 22. In yesterday’s WeChat, the high-tech
lithium battery technology and Rongbai Technology in cathodes, especially
high-tech The technical strength of nickel cathodes has been analyzed. For
details, please click "Application Mainly High-Nickel Three-Yuan Qidian Rongbai
Technology's "Technical Ace"".
In the field of next-generation cathode materials, Rongbai has also
developed new materials such as ultra-high nickel (nickel content higher than
90%) cathode materials, high-voltage nickel-manganese materials, solid-state
battery cathode materials, and sodium-ion battery cathode materials.
Improving battery energy density is one of the most important goals and
directions for the development of lithium batteries. The energy density of
ternary lithium-ion batteries can reach up to 300Wh/kg. To achieve the goal of
energy density reaching 400Wh/kg in 2025, it is necessary to transform the
battery material system and Regarding battery design, the battery system
currently most promising to achieve the above technical indicators is
all-solid-state battery technology.
All-solid-state batteries use solid electrolytes instead of organic liquid
electrolytes, which greatly improves the safety of the battery system. At the
same time, solid electrolytes are better suited to high specific energy positive
and negative electrode materials (such as metallic lithium) and reduce the
weight of the system, achieving a simultaneous increase in energy density. The
existing ternary cathode materials are not suitable for direct use in
all-solid-state batteries and require certain modifications to the ternary
cathode materials.
In addition to the power field, the energy storage field is also an
important scenario for the future large-scale application of chemical power
sources. Energy storage batteries require high safety, low cost, and long
service life. The existing lithium battery system has limited room for further
significant price reductions. New chemical systems need to be found to meet the
cost requirements in this field. In the sodium-ion battery system, the cathode
material not only does not contain lithium, but also does not contain the more
expensive cobalt element, which can significantly reduce the cost of the battery
core.
In the prospectus released to the public, Rongbai Technology introduced its
cathode material technology reserves and latest developments for different
markets in the future.
Single crystal NCM811
Study the ternary co-precipitation controlled crystallization technology of
nickel, cobalt and manganese to prepare a small-particle nickel-cobalt-manganese
hydroxide precursor with uniform co-precipitation of elements and good
dispersion. Research the single crystal NCM811 lithium mixing ratio, doping
elements and proportions, atmosphere sintering, crushing, surface treatment and
other processes to develop single crystal NCM811 products with high dispersion,
high temperature cycle, and high safety performance. The project is currently in
the trial production stage.
High energy Ni88 type NCM811
Through research on the existing NCM811 controlled crystallization
technology, a Ni88 nickel cobalt manganese hydroxide precursor with better
performance was prepared. Study the lithium mixing ratio, doping elements and
proportions, sintering temperature, sintering atmosphere conditions, surface
treatment and other processes to prepare a high-nickel (Ni≥88%) layered cathode
with higher energy density, stable structure and excellent electrochemical
performance. Material. Currently, the project is in the pilot stage.
High energy NCA
Study the nickel-cobalt (aluminum) co-precipitation controlled
crystallization technology to prepare a spherical hydroxide precursor with
uniform co-precipitation of elements and closely packed grains. Study the
effects of lithium mixing ratio, doping elements and proportions, sintering
temperature, sintering atmosphere methods and other processes on the material
structure and electrochemical performance to prepare cathode materials with high
capacity and stable structure. Research surface treatment technology, including
washing, coating and subsequent heat treatment, etc., to reduce the alkali
residue of materials, improve cycle and safety performance, research on large
and small particle blending technology, the compacted density of pole pieces is
≥3.6g/cc (Ni≥88%), Currently, the project has been put into trial
production.
Multi-element high energy density NCM
Study multi-element co-precipitation controlled crystallization technology
to prepare spherical-like hydroxide precursors with uniform co-precipitation of
elements and specific growth of crystal grains. Study the lithium mixing ratio,
doping elements and proportions, sintering temperature, sintering atmosphere
conditions and other processes to prepare cathode materials with high capacity
and stable structure. Research surface treatment technology, including washing,
coating and subsequent heat treatment, etc., to reduce the alkali residue of
materials, improve cycle and safety performance, research on large and small
particle blending technology, the compacted density of pole pieces is ≥3.6g/cc
(Ni≥90%), At present, the project has been implemented on a small scale.
High nickel single crystal Ni90
The development of high-nickel single crystal Ni90 products has a 5% higher
energy density and a 10% reduction in design costs compared to the first
generation single crystal Ni products.
Study the ternary co-precipitation controlled crystallization technology of
nickel, cobalt and manganese to prepare a small-particle nickel-cobalt-manganese
hydroxide precursor with uniform co-precipitation of elements and good
dispersion. Research the single crystal Ni90 lithium mixing ratio, doping
elements and proportions, atmosphere sintering, crushing, surface treatment and
other processes to develop single crystal Ni90 products with high dispersion,
high temperature cycle and high safety performance. At present, the project has
been implemented on a small scale.
Single crystal lithium nickel cobalt manganate ternary cathode material
Based on the company's existing high-voltage single crystal material
production technology, we will further study the impact of precursor particle
size, lithium mixing ratio, doping elements and proportions, sintering
temperature, crushing method, coating elements and proportions on the material
structure and proportion. Through the influence of electrochemical properties,
high-voltage high-nickel single crystal cathode materials with stable structure,
good dispersion and excellent cycle life have been prepared. Currently, the
project has achieved trial production.
High temperature sintering process of lithium nickel cobalt manganate
Based on the company's existing lithium nickel cobalt manganate sintering
technology, we have studied the lithium mixture and sintering temperature,
atmosphere, time, filling amount, etc., and developed a high-temperature
sintering technology suitable for large-scale industrialization to meet the
energy density of high nickel cathode materials. , structural stability,
electrochemical performance and safety performance are increasingly required. At
present, the project has achieved trial production.
Nickel cobalt lithium manganate cathode material element doping
technology
Study different methods, elements, and ratio doping processes for lithium
nickel cobalt manganate cathode materials, and develop element uniform doping
technology suitable for large-scale industrialization to improve the structural
stability, power output characteristics, high-temperature cycle life, and safety
of high-nickel cathode materials. performance. At present, the project has
achieved pilot testing.
High temperature sintering process of lithium nickel cobalt manganate
Based on the company's existing lithium nickel cobalt manganate sintering
technology, we have studied the lithium mixture and sintering temperature,
atmosphere, time, filling amount, etc., and developed a high-temperature
sintering technology suitable for large-scale industrialization to meet the
energy density of high nickel cathode materials. , structural stability,
electrochemical performance and safety performance are increasingly required. At
present, the project has achieved trial production.
Nickel cobalt lithium manganate cathode material element doping
technology
Study different methods, elements, and ratio doping processes for lithium
nickel cobalt manganate cathode materials, and develop element uniform doping
technology suitable for large-scale industrialization to improve the structural
stability, power output characteristics, high-temperature cycle life, and safety
of high-nickel cathode materials. performance. At present, the project has
achieved trial production.
Development of new precursor technologies
Based on the existing precursor research and development technology in
China and South Korea, integrate domestic and foreign technical resources, fully
master the precursor production technology with precise and controllable
composition, uniformity, crystal form, morphology, particle size and
distribution, and conduct comprehensive research on the precursor crystal. Grain
directional growth, element
Conduct in-depth research and development of new technologies such as
uniform element doping, gradient deposition, and core-shell structure to meet
the growing use requirements of power cathode materials. Currently, the project
has achieved pilot testing.
Research on nickel-manganese series (involving the development of
supporting electrolytes)
Develop cathode materials and adapted electrolyte systems with 5V spinel
structures; battery systems using these materials have
Higher energy density (compared to NCM811) and rate performance, and the
cost of cathode materials is low (equivalent to 35% of the cost of NCM
materials).
Sodium ion battery cathode material
Develop a sodium-ion battery system and positive and negative electrode
materials with low cost and excellent electrochemical performance; compared with
LiFePO4 batteries, this battery system has a cost reduction of about 10-20%, and
has better low-temperature performance, high-rate performance and other
characteristics.
All-solid-state battery cathode materials
Through the research and development of solid-state battery technology, we
will master the production technology of cathode materials and solid-state
electrolytes suitable for all-solid-state battery systems.
Detection technology optimization
Through the development of new detection technology and the update of
original testing technology, the internal microstructure of precursors and
cathode materials is analyzed, replacing the conventional method of testing
cycle life through battery charge and discharge, and establishing a database to
quickly judge and evaluate cycle performance, thereby improving research level
and new product development speed
Research and develop battery cathode waste recycling technology
The prices of cobalt, lithium, nickel, aluminum and copper in waste
lithium-ion batteries are relatively high, and some metal resources are scarce.
The metals are recycled to ensure a wet recovery rate of ≥98%, thereby reducing
raw material costs and reducing environmental harm. the goal of.
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