LG INR18650 MJ1

Key features

• 259.6Wh/kg at 23°C
  • 266Wh/kg [6]
• 736Wh/litre at 23°C
  • 720Wh/litre [6]
• 965W/kg
• 2736W/litre

Designed to meet

• Safety:
• Transport: UN38.3
• Quality:

• Nominal Capacity = 3.5Ah
• Nominal Voltage = 3.635V
• Nominal Energy = 12.72Wh
• Charge
  • Charge cutoff voltage = 4.2V
  • Maximum charge rate = 1.0 C (3400mA)
  • Temperature limits = 0° to 45°C
• Discharge
  • Cutoff voltage = 2.5V
  • Maximum discharge current = 10A
  • Maximum pulse discharge = 18.9A

Maximum current was based on 50% SoC nominal voltage, cutoff at 2.5V and DCIR of 60mΩ

• DCIR = 33mΩ
• Temperature limits = -20° to 60°C
• Storage temperature
  • 1 month -20 ~ 60℃
  • 3 month -20 ~ 45℃
  • 1 year -20 ~ 20℃
• Cycle life = 400 cycles [2]
  • see detail ageing test conclusions from EU project

Dimensions

• Diameter: 18.4 +0.1 / -0.3 mm (Max. 18.5mm)
  • hole through centre of jelly roll, diameter ~2mm
• H: 65.0 ±0.2mm (Max. 65.2mm)
• Volume: 0.0172litres
• Mass:
  • Maximum = 49.0g
  • Average = 46.8g

• Cathode
  • nickel (Ni)-rich lithium nickel manganese cobalt oxide (811)
  • length = 610mm
  • width = 59mm
  • thickness = 0.16mm
• Anode
  • graphite based with a presence of Si
    • Silicon content ~ 3.5wt% [10]
  • length = 660mm
  • width = 60mm
  • thickness = 0.17mm
• Case
  • wall thickness = 0.19mm
    • average = 0.165mm [9]

Test data

• Maximum discharge current =
• Short circuit current = A
• ACIR ≤ 40 mΩ at 1kHz
• DCIR = 60mΩ [4]

• Capacity
  • The specification sheet [2] shows a significant capacity temperature dependence

• Ageing
  • The EVERLASTING EU project used this cell for their ageing studies and conducted extensive testing. Their conclusions from their report [1] are shown below:
  • The ageing stress factor investigated in this study are:
    • the environmental temperature during life cycling and during storage where it was shown that high (45°C) and very low (0°C) temperatures increases the ageing rate. This was observed for both calendar and life cycling tests.
    • the cycling C-rate where the charge and discharge currents were varied. It was shown that high discharge rate (3C) led the cell to its EOL in less than 600 equivalent cycles.
    • the cycling window where the two most common ranges were used i.e. 70 to 90%SOC (corresponding to home to work daily trip) and 10 to 90%SOC. This study shows that cycling in a wide SOC window decreases the cells’ lifetime.
    • the storage SOC level. This test simulates the effect of car parking on the cell lifetime. It was shown that high (45°C) and low (0°C) temperatures increases the cell’s ageing rate. And low SOC (10%) has the lowest degradation effect compared to 70% and 90%SOC. However it was shown that compared the cells stored at 90%SOC, the ones stored at 70%SOC has a higher degradation rate. Additional ageing tests were started to better understand this behaviour rand will be reported in later reports and SCI papers.

• Gas Pressure
  • Hemmerling et al [10] show the gas pressure versus SoC for an LG INR18650 MJ1 cell during a stepped C/3 charge cycle with a relaxation time.

Safety data

Independent safety tests of the cell.

• Thermal Runaway
  • energy released = 73.8kJ
  • 80% of energy released through ejected material and gases