Question: I'm designing a solid state battery disconnect switch and I want to improve the mosfets' turn-on immunity (high dV/dt on Vds) without impacting the turn-off time. I don't really care about the turn-on time, it can be 100x slower than turn-off time, no problem.

I came up with this solution:

[![enter image description here](https://i.stack.imgur.com/pCPJI.png)](https://i.stack.imgur.com/pCPJI.png)

C1 obviously improves the immunity and D1 should leave the turn-off time the same. Did I miss something? is there a better way to do this?

NB: mosfet's datasheet is available [here](https://www.onsemi.com/pub/Collateral/FDBL86361_F085-D.PDF) and the driver's datasheet is [here](https://www.mouser.fr/datasheet/2/196/Infineon-1EDI60N12AF-DS-v02_00-EN-1226228.pdf). I'll use a +/- 12 V symmetric supply and the driver will drive 10 mosfets in parallel.

Answer: 
Your MOSFET driver 1EDI has excellent description !

"The 1EDI EiceDRIVER™ Compact is a general purpose MOSFET gate driver.
....
The separated rail-to-rail driver outputs simplify gate resistor selection, save an external high current bypass diode and enhance dV/dt control."

So You can control On and Off time simply by selecting two resistors:
 Ron from Out+(ON) to Q1gate and[![enter image description here](https://i.stack.imgur.com/e6Twn.png)](https://i.stack.imgur.com/e6Twn.png)
 Roff from Out-(OFF) to Q1gate;

There is no need of any other components!

time on = Ron.Ciss; 
time of = Roff\*Ciss;

{FDBL86361-F085 Ciss Input Capacitance VDS = 40 V, VGS = 0 V, f = 1 MHz − 12800 − pF}

Aprox. calculations for single MOSFET: 
Ron=100R; Ciss=13nF=12e-9F; Ton=1.3e-6s = 1.3uS  

Roff=10R; Ciss=13nF=12e-9F; Toff=1.3e-7s = 130ns

If you will drive 10 mosfets in parallel then Ciss will increase 10 times. 

About driver supply: It is better to use bipolar to "prevent a dynamic turn on of the MOSFET".
P.S. If you want to decrease dV/dt simply add an inductance to the load in series. (with all the consequences)
Why not simply increase the switch-on resistance by adding R3?

![schematic](https://i.stack.imgur.com/5jJel.png)

[simulate this circuit](/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2f5jJel.png) – Schematic created using [CircuitLab](https://www.circuitlab.com/)