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ENGINE, EMISSIONS, AND VEHICLE RESEARCH DIVISION
FAX: (210) 522- 2019
HTTP://ENGINEANDVEHICLE.SWRI.ORG
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January 12, 2012
Subject:
SwRI Energy Storage System Evaluation and Safety (EssEs) Consortium Member
Feedback Questionnaire
Dear EssEs Member:
The purpose of this questionnaire is to seek a consensus on selecting cells of interest and
to identify a common area of interest for the EssEs Consortium’s Year 2 proposed research
project. We would like to receive your responses by February 29th, 2012. Your timely feedback
is very important to the success of the Consortium and is highly valued by the SwRI EssEs team.
1.0
Cells of Interest
For reference purposes, the following four (4) types of “primary” cells are under full
evaluation currently:
1.
2.
3.
4.
A123 Systems 32113 Lithium Iron Phosphate cathode (4.4 Ahr 3.2 V)
EIG F014 Lithium Iron Phosphate cathode (14 Ahr 3.2 V)
Toshiba ScIB Lithium Titanate anode (4.2 Ahr 2.4 V)
LG Chemical Lithium Manganese Oxide cathode (15 Ahr 3.7 V)
The following five (5) types of “secondary” cells are either procured or under acquisition:
1.
2.
3.
4.
5.
A123 Systems Lithium Iron Phosphate cathode (20 Ahr 3.2 V) (acquired)
ATL Battery Lithium Iron Phosphate cathode (60 Ahr or 35 Ahr 3.2 V) (in
process)
Lishen Battery Lithium Iron Phosphate cathode (16.5 Ahr 3.2 V) (in
process)
Altair Nano Lithium Titanate anode (13 Ahr ~2.3 V) (in process)
CENAT (JV between ENAX and CATARC) Lithium Nickel Cobalt
Manganese Oxide cathode (25 Ahr 3.7 V) (in process)
SAN ANTONIO, TEXAS
H O U S T O N , T E X A SƔ : $ 6 + , 1 * 7 2 1 ' & Ɣ $ 1 1 $ 5 % 2 5 0 ,
EssEs Member
January 12, 2012
Page 2 of 5
The EssEs team requests your feedback on following questions:
1.
2.
Manufacturer
What other cell manufacturers’ cells are you interested in seeing tested?
Please specify the top three (3) companies in descending order of interest.
1)
______________________________________________________
2)
______________________________________________________
3)
______________________________________________________
Specify up to three (3) cells that you are interested in testing. Please
complete all fields.
Product
ID
Chemistry
(e.g. LFP)
Capacity
(Ahr)
Nominal
Voltage
Cell Format
(Prismatic/Pouch/Cylindrical)
3.
Would your company be willing to provide cells to the consortium for
testing? If you are a vehicle manufacturer or system integrator, would you
be willing to provide cells that you have or can procure through an
existing program/relationship with a battery supplier?
4.
Would you be willing to provide cells to consortium at no cost?
SwRI Project 03.16771
EssEs Member
January 12, 2012
Page 3 of 5
5.
2.0
Please list any additional comments you wish to direct to the EssEs team.
Topical Area of Research
The EssEs team is proposing to do work on one topical area for Year 2, due to the
challenges of cell procurement. Please vote on the following three (3) proposed topical areas of
interest based on the research background and your application needs.
1.
Improved Method of Battery Size Factor (BSF) Determination
x Objective: Investigating an objective method of calculating BSF
x Background:
Current BSF determination is a subjective process according to U. S.
Department of Energy Vehicle Technologies Program. The result will
influence pack size for specific application. The BSF determination process is
linearly dependent upon values chosen for Vmin, Vmax, DODmin, and DODmax.
x Proposed Research:
Vmin, Vmax, DODmin, and DODmax will be experimentally determined through
proper experimental designs.
2.
Cell Strain vs. State of Charge (SOC)
x Objective: Develop an innovative method for SOC measurement
x Background:
During charging and discharging it is known that there is change in volume of
electrodes due to constant Li-ion intercalation and de-intercalation
x Proposed Research:
If internal temperature based expansion can be referenced out, the external
strain will be a reflection of volume changes of electrode materials due to
charge/discharge process. Strain gauges and thermocouples will be mounted
to generate data during charge/discharge cycling. Following diagrams are two
preliminary experimental results.
SwRI Project 03.16771
EssEs Member
January 12, 2012
Page 4 of 5
3.
Lithium Plating Effect at Low Temperature
x Objective: Identify lithium plating using cyclic voltammetry (CV)
x Background:
Lithium plating detrimentally affects performance and cycle life of battery.
Batteries with lithium plating are known to be more vulnerable to failure if
exposed to vibration or other stressful conditions.
x Proposed Research:
Testing will be done on 16 cells: 4 cells at each temperature at 4 temperatures
(-35, -20, -10, and 0 deg C). Cells will be conditioned at 25 deg C and tested
at a given SOC with increasing magnitude current pulses at a given test
temperature. After a current pulse at a test temperature, cells will be brought
back to 25 deg C and cyclic voltammetry will be performed. The results of
cyclic voltammetry will be used to attempt to identify conditions which result
in plating.
4.
Please vote:
The voting scale will be from 1 to 3 with 1 being the area that you are most interested in
and 3 being the area that you are the least interested in.
– Improved Method of BSF Determination
– Strain vs SOC
– Lithium Plating at Low Temperature
SwRI Project 03.16771
Vote
___________
___________
___________
EssEs Member
January 12, 2012
Page 5 of 5
5. Please suggest other topical area of interest if you like.
3.0
CONCLUSION
Please
return
the
completed
form
to
either
Bapi
Surampudi
at
[email protected] or Kimberly Quintero at [email protected]. Thank you
for your timely response in this matter.
Best Regards,
EssEs Team
Department of Engine and Vehicle R&D
/kq
SwRI Project 03.16771