Hydraulic bell-type atmosphere furnace helps Chinese battery material companies achieve controlled atmosphere sintering of high-nickel cathode materials.

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Hydraulic bell-type atmosphere furnace helps Chinese battery material companies achieve controlled atmosphere sintering of high-nickel cathode materials.

1. Customer Introduction

Customer Name: A New Energy Technology Co., Ltd. in Zhejiang, China (Professional Manufacturer of Lithium-ion Battery Cathode Materials)

Industry: New Energy Battery Materials, High-Nickel Ternary Cathodes (NCM811, NCA).

Core Needs: To conduct sintering experiments on high-nickel ternary cathode materials under strictly controlled oxygen/air atmospheres to obtain stable electrochemical performance, while meeting the rapid switching requirements for small-batch, multi-formula production during the R&D phase.

This customer, located in Ningbo, Zhejiang Province, is a high-tech enterprise specializing in the R&D and production of high-energy-density lithium-ion battery cathode materials. The company's main products are high-nickel NCM (Ni≥80%) and NCA, primarily supplied to leading domestic power battery manufacturers. With the increasing demands for driving range in electric vehicles, the sensitivity of high-nickel materials to atmosphere (oxygen concentration, dew point) during sintering is becoming increasingly prominent: insufficient oxygen leads to increased lithium-nickel mixing and reduced capacity; excessive oxygen increases costs and poses safety risks. The customer's existing large roller kiln was mainly used for mass production, but it could not meet the R&D center's needs for rapid verification of small batches with multiple variables (different temperatures, atmospheres, and holding times). Therefore, the customer urgently needed a laboratory atmosphere muffle furnace with controllable atmosphere, rapid heating, and flexible operation for the early-stage formulation screening and process optimization of high-nickel cathode materials.

2. Equipment Introduction
Equipment Name: Hydraulic bell-type atmosphere Furnace
Product Model: PT-E1400-512LDZ
Operating Temperature: ≤1200℃ (Common sintering temperature: 750～950℃);
Furnace Chamber Volume: 3～30L optional (12L selected in this case, internal dimensions 300×300×400mm);
Furnace Chamber Material: High-purity alumina polycrystalline fiber, low heat capacity, fast heating rate;
Heating Element: Molybdenum resistance wire/Fe-Cr-Al alloy wire, four-sided heating, excellent temperature uniformity;
Temperature Control System: PID+SCR programmable temperature control, 30-segment programmable, temperature control accuracy ±1℃, furnace temperature uniformity ±3℃ (at 1000℃);
Atmosphere Control: Fully sealed furnace shell + stainless steel sealed flange door, equipped with an air inlet (can be connected to a mass flow meter) and an exhaust port (can be connected to a tail gas treatment system), can be introduced with air, O₂, N₂, Ar or Ar/H₂ mixture;
Vacuum Capacity (Optional): Vacuum pump can be added to achieve low vacuum pretreatment (≤10⁻²).
Safety Design: Over-temperature alarm, thermocouple breakage protection, furnace door interlock, adjustable exhaust chimney;
Control System: 7-inch touchscreen, real-time display of temperature curves, atmosphere flow rate, and running time, supporting data export;
Special Features: Optional oxygen analyzer for closed-loop control of oxygen concentration in the furnace (ppm level).

This series of Hydraulic bell-type atmosphere furnace is specifically designed for high-temperature processing of materials under specific atmospheres, particularly suitable for the sintering, annealing, and heat treatment of battery materials (high-nickel cathode, silicon-carbon anode, solid electrolyte) sensitive to oxidation/reduction atmospheres. Compared to traditional box furnaces, its sealed structure precisely maintains the furnace atmosphere, preventing material degradation caused by air infiltration.

3. Equipment Application

Specific Process: Oxygen atmosphere sintering of high-nickel ternary cathode material (NCM811)

Processed Materials: Mixed powder of NCM811 precursor (Ni₀.₈Co₀.₁Mn₀.₁(OH)₂) and lithium source (LiOH·H₂O)

Process Objective: To complete the lithiation reaction under an oxygen atmosphere, forming a layered structure LiNi₀.₈Co₀.₁Mn₀.₁O₂, and to control the degree of lithium-nickel mixing, thereby improving discharge specific capacity and cycle stability.

4. Customer Feedback

*“We initially purchased this Hydraulic bell-type atmosphere furnace simply to address the problem of insufficient oxidizing atmosphere during the sintering of high-nickel materials. After using it, we found its value far exceeded our expectations. First, the furnace's sealing performance is excellent—we used a dew point meter to measure the atmosphere inside the furnace, and at an oxygen flow rate of 1L/min, the dew point completely met the stringent low moisture requirements of high-nickel materials. Second, the temperature uniformity resulting from four-sided heating is satisfactory; even with crucibles in different locations, the difference in material volume after sintering is controlled within 1%. The equipment is also very user-friendly; our R&D staff could program it independently within half a day. The furnace chamber is easy to clean, and there is no cross-contamination when switching between different materials. It can be said that this atmosphere muffle furnace has become the core equipment of our cathode material R&D laboratory, and we strongly recommend it to our fellow material developers.”*

— Dr. Zhang, R&D Director, a new energy technology company in Zhejiang

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Hydraulic bell-type atmosphere furnace helps Chinese battery material companies achieve controlled atmosphere sintering of high-nickel cathode materials.

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